Classification Term: 1701
Retinoids (ontology term: CHEMONTID:0001606)
Oxygenated derivatives of 3,7-dimethyl-1-(2,6,6-trimethylcyclohex-1-enyl)nona-1,3,5,7-tetraene and derivatives thereof." [ISBN:0967855098]
found 60 associated metabolites at sub_class metabolite taxonomy ontology rank level.
Ancestor: Prenol lipids
Child Taxonomies: Retinoid esters
all-trans-Retinoic acid
all-trans-Retinoic acid is an isomer of retinoic acid, the oxidized form of vitamin A. Retinoic acid functions in determining position along embryonic anterior/posterior axis in chordates. It acts through Hox genes, which ultimately controls anterior/posterior patterning in early developmental stages (PMID:17495912). It is an important regulator of gene expression during growth and development, and in neoplasms. As a drug, all-trans-retinoic acid is known as tretinoin. Tretinoin is derived from maternal vitamin A and is essential for normal growth and embryonic development. An excess of tretinoin can be teratogenic. Tretinoin is used in the treatment of psoriasis, acne vulgaris, and several other skin diseases. It has also been approved for use in promyelocytic leukemia (leukemia, promyelocytic, acute). Retinoic acid is the oxidized form of Vitamin A. It functions in determining position along embryonic anterior/posterior axis in chordates. It acts through Hox genes, which ultimately controls anterior/posterior patterning in early developmental stages (PMID: 17495912). It is an important regulator of gene expression during growth and development, and in neoplasms. Tretinoin, also known as retinoic acid and derived from maternal vitamin A, is essential for normal growth and embryonic development. An excess of tretinoin can be teratogenic. It is used in the treatment of psoriasis; acne vulgaris; and several other skin diseases. It has also been approved for use in promyelocytic leukemia (leukemia, promyelocytic, acute). [HMDB] L - Antineoplastic and immunomodulating agents > L01 - Antineoplastic agents > L01X - Other antineoplastic agents > L01XF - Retinoids for cancer treatment D - Dermatologicals > D10 - Anti-acne preparations > D10A - Anti-acne preparations for topical use > D10AD - Retinoids for topical use in acne C274 - Antineoplastic Agent > C2122 - Cell Differentiating Agent > C1934 - Differentiation Inducer C274 - Antineoplastic Agent > C163758 - Targeted Therapy Agent > C804 - Retinoic Acid Agent Acquisition and generation of the data is financially supported in part by CREST/JST. C308 - Immunotherapeutic Agent > C129820 - Antineoplastic Immunomodulating Agent D020011 - Protective Agents > D000975 - Antioxidants > D002338 - Carotenoids D003879 - Dermatologic Agents > D007641 - Keratolytic Agents D000970 - Antineoplastic Agents Retinoic acid is a metabolite of vitamin A that plays important roles in cell growth, differentiation, and organogenesis. Retinoic acid is a natural agonist of RAR nuclear receptors, with IC50s of 14 nM for RARα/β/γ. Retinoic acid bind to PPARβ/δ with Kd of 17 nM. Retinoic acid acts as an inhibitor of transcription factor Nrf2 through activation of retinoic acid receptor alpha. Retinoic acid is a metabolite of vitamin A that plays important roles in cell growth, differentiation, and organogenesis. Retinoic acid is a natural agonist of RAR nuclear receptors, with IC50s of 14 nM for RARα/β/γ. Retinoic acid bind to PPARβ/δ with Kd of 17 nM. Retinoic acid acts as an inhibitor of transcription factor Nrf2 through activation of retinoic acid receptor alpha. Retinoic acid is a metabolite of vitamin A that plays important roles in cell growth, differentiation, and organogenesis. Retinoic acid is a natural agonist of RAR nuclear receptors, with IC50s of 14 nM for RARα/β/γ. Retinoic acid bind to PPARβ/δ with Kd of 17 nM. Retinoic acid acts as an inhibitor of transcription factor Nrf2 through activation of retinoic acid receptor alpha.
Retinal
A carotenoid constituent of visual pigments. It is the oxidized form of retinol which functions as the active component of the visual cycle. It is bound to the protein opsin forming the complex rhodopsin. When stimulated by visible light, the retinal component of the rhodopsin complex undergoes isomerization at the 11-position of the double bond to the cis-form; this is reversed in "dark" reactions to return to the native trans-configuration. [HMDB]. Retinal is found in many foods, some of which are flaxseed, pepper (c. baccatum), climbing bean, and other soy product. Retinal is a carotenoid constituent of visual pigments. It is the oxidized form of retinol which functions as the active component of the visual cycle. It is bound to the protein opsin forming the complex rhodopsin. When stimulated by visible light, the retinal component of the rhodopsin complex undergoes isomerization at the 11-position of the double bond to the cis-form; this is reversed in "dark" reactions to return to the native trans-configuration. D020011 - Protective Agents > D000975 - Antioxidants > D002338 - Carotenoids CONFIDENCE standard compound; INTERNAL_ID 142
Retinol(Vitamin A)
Vitamin A (retinol) is a yellow fat-soluble, antioxidant vitamin important in vision and bone growth. It belongs to the family of chemical compounds known as retinoids. Retinol is ingested in a precursor form; animal sources (milk and eggs) contain retinyl esters, whereas plants (carrots, spinach) contain pro-vitamin A carotenoids. Hydrolysis of retinyl esters results in retinol while pro-vitamin A carotenoids can be cleaved to produce retinal. Retinal, also known as retinaldehyde, can be reversibly reduced to produce retinol or it can be irreversibly oxidized to produce retinoic acid. Retinol and derivatives of retinol that play an essential role in metabolic functioning of the retina, the growth of and differentiation of epithelial tissue, the growth of bone, reproduction, and the immune response. Dietary vitamin A is derived from a variety of carotenoids found in plants. It is enriched in the liver, egg yolks, and the fat component of dairy products. Retinyl esters from animal-sourced foods (or synthesized for dietary supplements for humans and domesticated animals) are acted upon by retinyl ester hydrolases in the lumen of the small intestine to release free retinol. Retinol enters intestinal absorptive cells by passive diffusion. Absorption efficiency is in the range of 70 to 90\%. Humans are at risk for acute or chronic vitamin A toxicity because there are no mechanisms to suppress absorption or excrete the excess in urine.[5] Within the cell, retinol is there bound to retinol binding protein 2 (RBP2). It is then enzymatically re-esterified by the action of lecithin retinol acyltransferase and incorporated into chylomicrons that are secreted into the lymphatic system. Unlike retinol, β-carotene is taken up by enterocytes by the membrane transporter protein scavenger receptor B1 (SCARB1). The protein is upregulated in times of vitamin A deficiency. If vitamin A status is in the normal range, SCARB1 is downregulated, reducing absorption.[6] Also downregulated is the enzyme beta-carotene 15,15'-dioxygenase (formerly known as beta-carotene 15,15'-monooxygenase) coded for by the BCMO1 gene, responsible for symmetrically cleaving β-carotene into retinal.[8] Absorbed β-carotene is either incorporated as such into chylomicrons or first converted to retinal and then retinol, bound to RBP2. After a meal, roughly two-thirds of the chylomicrons are taken up by the liver with the remainder delivered to peripheral tissues. Peripheral tissues also can convert chylomicron β-carotene to retinol.[6][15] The capacity to store retinol in the liver means that well-nourished humans can go months on a vitamin A deficient diet without manifesting signs and symptoms of deficiency. Two liver cell types are responsible for storage and release: hepatocytes and hepatic stellate cells (HSCs). Hepatocytes take up the lipid-rich chylomicrons, bind retinol to retinol-binding protein 4 (RBP4), and transfer the retinol-RBP4 to HSCs for storage in lipid droplets as retinyl esters. Mobilization reverses the process: retinyl ester hydrolase releases free retinol which is transferred to hepatocytes, bound to RBP4, and put into blood circulation. Other than either after a meal or when consumption of large amounts exceeds liver storage capacity, more than 95\% of retinol in circulation is bound to RBP4.[15] Vitamin A is a fat-soluble vitamin, hence an essential nutrient. The term "vitamin A" encompasses a group of chemically related organic compounds that includes retinol, retinal (also known as retinaldehyde), retinoic acid, and several provitamin (precursor) carotenoids, most notably beta-carotene.[3][4][5][6] Vitamin A has multiple functions: essential in embryo development for growth, maintaining the immune system, and healthy vision, where it combines with the protein opsin to form rhodopsin – the light-absorbing molecule necessary for both low-light (scotopic vision) and color vision.[7] Vitamin A occurs as two principal forms in foods: A) retinol, found in animal-sourced foods, either as retinol or bound to a fatty acid to become a retinyl ester, and B) the carotenoids alpha-carotene, β-carotene, gamma-carotene, and the xanthophyll beta-cryptoxanthin (all of which contain β-ionone rings) that function as provitamin A in herbivore and omnivore animals which possess the enzymes that cleave and convert provitamin carotenoids to retinal and then to retinol.[8] Some carnivore species lack this enzyme. The other carotenoids have no vitamin activity.[6] Dietary retinol is absorbed from the digestive tract via passive diffusion. Unlike retinol, β-carotene is taken up by enterocytes by the membrane transporter protein scavenger receptor B1 (SCARB1), which is upregulated in times of vitamin A deficiency.[6] Storage of retinol is in lipid droplets in the liver. A high capacity for long-term storage of retinol means that well-nourished humans can go months on a vitamin A- and β-carotene-deficient diet, while maintaining blood levels in the normal range.[4] Only when the liver stores are nearly depleted will signs and symptoms of deficiency show.[4] Retinol is reversibly converted to retinal, then irreversibly to retinoic acid, which activates hundreds of genes.[9] Vitamin A deficiency is common in developing countries, especially in Sub-Saharan Africa and Southeast Asia. Deficiency can occur at any age but is most common in pre-school age children and pregnant women, the latter due to a need to transfer retinol to the fetus. Vitamin A deficiency is estimated to affect approximately one-third of children under the age of five around the world, resulting in hundreds of thousands of cases of blindness and deaths from childhood diseases because of immune system failure.[10] Reversible night blindness is an early indicator of low vitamin A status. Plasma retinol is used as a biomarker to confirm vitamin A deficiency. Breast milk retinol can indicate a deficiency in nursing mothers. Neither of these measures indicates the status of liver reserves.[6] The European Union and various countries have set recommendations for dietary intake, and upper limits for safe intake. Vitamin A toxicity also referred to as hypervitaminosis A, occurs when there is too much vitamin A accumulating in the body. Symptoms may include nervous system effects, liver abnormalities, fatigue, muscle weakness, bone and skin changes, and others. The adverse effects of both acute and chronic toxicity are reversed after consumption of high dose supplements is stopped.[6]
4-Oxoretinol
4-oxo-retinol, a metabolite of retinol synthesized in mouse embryonal carcinoma F9 cells,is active in inducing differentiation of these cells. It also functions as a ligand of retinoic acid receptors and a transcriptional activator of reporter. genes.[PMID: 9110564]. 4-Oxoretinol is a metabolite of retinol in the human promyelocytic leukemia cell line NB4 which induces cell growth arrest and granulocytic differentiation.[PMID: 9581846]. 4-oxo-retinol, a metabolite of retinol synthesized in mouse embryonal carcinoma F9 cells,is active in inducing differentiation of these cells. It also functions as a ligand of retinoic acid receptors and a transcriptional activator of reporter D020011 - Protective Agents > D000975 - Antioxidants > D002338 - Carotenoids
All-trans-13,14-dihydroretinol
All-trans-13,14-dihydroretinol is involved in the retinol metabolism pathway. In this pathway, all-trans-13,14-dihydroretinol and an acceptor molecule is reversibly converted to retinol (vitamin A) plus reduced acceptor via the enzyme all-trans-retinol 13,14-reductase (EC 1.3.99.23). (KEGG) [HMDB] All-trans-13,14-dihydroretinol is involved in the retinol metabolism pathway. In this pathway, all-trans-13,14-dihydroretinol and an acceptor molecule is reversibly converted to retinol (vitamin A) plus reduced acceptor via the enzyme all-trans-retinol 13,14-reductase (EC 1.3.99.23). (KEGG). D020011 - Protective Agents > D000975 - Antioxidants > D002338 - Carotenoids
Vitamin A2 aldehyde
Vitamin A2 aldehyde is found in fishes. Vitamin A2 aldehyde is a constituent fish of liver oils D020011 - Protective Agents > D000975 - Antioxidants > D002338 - Carotenoids Constituent fish of liver oils. Vitamin A2 aldehyde is found in fishes.
Tazarotene
C21H21NO2S (351.12929260000004)
Tazarotene is only found in individuals that have used or taken this drug. It is a prescription topical retinoid sold as a cream or gel. This medication is approved for treatment of psoriasis, acne, and sun damaged skin (photodamage). [Wikipedia]Although the exact mechanism of tazarotene action is not known, studies have shown that the active form of the drug (tazarotenic acid) binds to all three members of the retinoic acid receptor (RAR) family: RARa, RARb, and RARg, but shows relative selectivity for RARb, and RARg and may modify gene expression. It also has affinity for RXR receptors. C274 - Antineoplastic Agent > C2122 - Cell Differentiating Agent > C1934 - Differentiation Inducer C274 - Antineoplastic Agent > C163758 - Targeted Therapy Agent > C804 - Retinoic Acid Agent D - Dermatologicals > D05 - Antipsoriatics > D05A - Antipsoriatics for topical use C308 - Immunotherapeutic Agent > C129820 - Antineoplastic Immunomodulating Agent D003879 - Dermatologic Agents > D007641 - Keratolytic Agents D009676 - Noxae > D013723 - Teratogens Same as: D01132
7-a,25-Dihydroxycholesterol
7α, 25-dihydroxycholesterol (7α,25-OHC) is a potent and selective agonist and endogenous ligand of the orphan GPCR receptor EBI2 (GPR183). 7α, 25-dihydroxycholesterol is highly potent at activating EBI2 (EC50=140 pM; Kd=450 pM). 7α, 25-dihydroxycholesterol can serve as a chemokine directing migration of B cells, T cells and dendritic cells[1][2].
4-Hydroxyretinoic acid
4-Hydroxyretinoic acid is an NADPH-dependent hydroxylation metabolite of retinoic acid in the microsomes, via the cytochrome P-450 system. Retinoic acid is an activated metabolite of retinol that supports the systemic functions of vitamin A in vivo. (PMID: 1538719, 1932598, 2851384) [HMDB] 4-Hydroxyretinoic acid is an NADPH-dependent hydroxylation metabolite of retinoic acid in the microsomes, via the cytochrome P-450 system. Retinoic acid is an activated metabolite of retinol that supports the systemic functions of vitamin A in vivo. (PMID: 1538719, 1932598, 2851384). D020011 - Protective Agents > D000975 - Antioxidants > D002338 - Carotenoids
all-trans-5,6-Epoxyretinoic acid
all-trans-5,6-Epoxyretinoic acid, also known as 5,6-epoxy-atRA, is classified as a member of the retinoids. Retinoids are oxygenated derivatives of 3,7-dimethyl-1-(2,6,6-trimethylcyclohex-1-enyl)nona-1,3,5,7-tetraene and derivatives thereof. all-trans-5,6-Epoxyretinoic acid is considered to be a practically insoluble (in water) and a weak acidic compound. all-trans-5,6-Epoxyretinoic acid is an isoprenoid lipid molecule. all-trans-5,6-Epoxyretinoic acid can be found primarily in human kidney and liver tissues; and in blood and urine. Within a cell, all-trans-5,6-epoxyretinoic acid is primarily located in the cytoplasm, in the extracellular space, or near the membrane. A human metabolite taken as a putative food compound of mammalian origin [HMDB] D020011 - Protective Agents > D000975 - Antioxidants > D002338 - Carotenoids
11-cis-Retinaldehyde
11-cis-retinal is a retinal having 2E,4Z,6E,8E-double bond geometry. It has a role as a chromophore, a human metabolite and a mouse metabolite. It is a diterpene derived from the carotenoid vitamin A which functions as the active component of the visual cycle. It is the prosthetic group of rhodopsin. When stimulated by visible light, rhodopsin transforms this cis-isomer of retinal to the trans-isomer (11-trans-retinal). This transformation straightens-out the bend of the retinal molecule and causes a change in the shape of rhodopsin triggering the visual process. A series of energy-requiring enzyme-catalyzed reactions convert the 11-trans-retinal back to the cis-isomer. 11-cis-retinal functions in the retina in the transduction of light into the neural signals necessary for vision. 11-cis-retinal, while attached to opsin in rhodopsin is isomerized to all-trans-retinal by light. This is the event that triggers the nerve impulse to the brain which allows for the perception of light. All-trans-retinal is then released from opsin and reduced to all-trans-retinol. All-trans-retinol is isomerized to 11-cis-retinol in the dark, and then oxidized to 11-cis-retinal. 11-cis-retinal recombines with opsin to re-form rhodopsin. Night blindness or defective vision at low illumination results from a failure to resynthesize 11-cis retinal rapidly. Vitamin A (all-trans retinol) is converted in the retina to the 11-cis-isomer of retinaldehyde or 11-cis-retinal. 11-cis-retinal functions in the retina in the transduction of light into the neural signals necessary for vision. 11-cis-retinal, while attached to opsin in rhodopsin is isomerized to all-trans-retinal by light. This is the event that triggers the nerve impulse to the brain which allows for the perception of light. All-trans-retinal is then released from opsin and reduced to all-trans-retinol. All-trans-retinol is isomerized to 11-cis-retinol in the dark, and then oxidized to 11-cis-retinal. 11-cis-retinal recombines with opsin to re-form rhodopsin. Night blindness or defective vision at low illumination results from a failure to resynthesize 11-cis retinal rapidly. D020011 - Protective Agents > D000975 - Antioxidants > D002338 - Carotenoids
9-cis-Retinoic acid
9-cis-Retinoic acid is an active retinoid that regulates expression of retinoid responsive genes, serving as a ligand for two classes of ligand-dependent transcription factors: the retinoic acid receptors and retinoid X receptors. Retinoids (vitamin A and its analogs) are essential dietary substances that are needed by mammals for reproduction, normal embryogenesis, growth, vision, and maintaining normal cellular differentiation and the integrity of the immune system. Within cells, retinoids regulate gene transcription acting through ligand-dependent transcription factors, the retinoic acid receptors (RARs), and the retinoid X receptors (RXRs). all-trans-Retinoic acid binds only to RARs with high affinity, whereas its 9-cis isomer binds with high affinity to both RARs and RXRs. The actions of all-trans- and 9-cis-retinoic acid in regulating cellular responses are distinct and not interchangeable (PMID: 9115228). Isolated from pancreas of pig and cow. Digestive enzyme. It is used in replacement therapy. It is used to prepare protein hydrolysates for pre- and post-operative diets D - Dermatologicals > D11 - Other dermatological preparations > D11A - Other dermatological preparations > D11AH - Agents for dermatitis, excluding corticosteroids L - Antineoplastic and immunomodulating agents > L01 - Antineoplastic agents > L01X - Other antineoplastic agents > L01XF - Retinoids for cancer treatment C274 - Antineoplastic Agent > C2122 - Cell Differentiating Agent > C1934 - Differentiation Inducer C274 - Antineoplastic Agent > C163758 - Targeted Therapy Agent > C804 - Retinoic Acid Agent C308 - Immunotherapeutic Agent > C129820 - Antineoplastic Immunomodulating Agent D020011 - Protective Agents > D000975 - Antioxidants > D002338 - Carotenoids D000970 - Antineoplastic Agents D003879 - Dermatologic Agents Same as: D02815
11-cis-Retinol
Cis-11-retinol is produce from vitamin A cycle driven by interphotoreceptor retinoid binding protein(IRBP). cis-11-retinol is released from retinal pigment epithelium(RPE) membranes. (PMID: 10655150). Retinoid metabolism of RPE cells freshly isolated by trypsinization showed no 11- cis -retinal and little 11- cis -retinol formation. Nondamaged cells cultured on thermally responsive surfaces detached in sheets upon temperature change. They showed metabolism similar to that of cells freshly isolated by nonenzymatic means. After trypsinization, confluent cultures dissociated into individual cells, but these cells showed poor retinoid metabolism, including no detectable retinyl esters or 11- cis -retinoid isomers. (PMID: 10375454). Cis-11-retinol is produce from vitamin A cycle driven by interphotoreceptor retinoid binding protein(IRBP). cis-11-retinol is released from retinal pigment epithelium(RPE) membranes. (PMID: 10655150) D020011 - Protective Agents > D000975 - Antioxidants > D002338 - Carotenoids D018977 - Micronutrients > D014815 - Vitamins
9-cis-Retinol
9-cis-retinol is a retinoid. Retinoids (vitamin A and its analogs) are essential dietary substances that are needed by mammals for reproduction, normal embryogenesis, growth, vision, and maintaining normal cellular differentiation and the integrity of the immune system. Within cells, retinoids regulate gene transcription acting through ligand-dependent transcription factors, the retinoic acid receptors (RARs), and the retinoid X receptors (RXRs). All-trans-retinoic acid binds only to RARs with high affinity, whereas its 9-cis isomer binds with high affinity to both RARs and RXRs. The actions of all-trans- and 9-cis-retinoic acid in regulating cellular responses are distinct and not interchangeable. (PMID: 9115228). Constituent of cod liver oil
9-cis-Retinal
In vivo, 9-cis-retinal is formed through oxidation of 9-cis-retinol by cis-retinol dehydrogenase (cRDH). (PMID:15572038). The generation of retinoic acid from retinol is a two-step reaction, with the rate-limiting step being the oxidation of retinol into the intermediate retinaldehyde. Two classes of. unrelated enzymes have been implicated in the oxidation of retinol, the classical cytosolic medium chain alcohol dehydrogenases and recently identified microsomal members of the short chain alcohol dehydrogenase reductase (SDR) superfamily. Further oxidation of the retinaldehyde to the retinoic acid is believed to be catalyzed by several cytosolic aldehyde dehydrogenases. Retinoids are micronutrients required to maintain and promote health of vertebrates. They act physiologically by participating in the visual cycle, in regulating cell differentiation, in embryonic development (PMID:10893430), in maintaining normal reproduction, and in the immune response (PMID:8882153). In non-ocular tissues, the effects of retinoids within the body are mediated through retinoic acid receptors (RARs) and retinoid X receptors (RXRs), which act to regulate gene expression as ligand-dependent transcription factors. The naturally occurring ligands for these nuclear receptors are thought to be all-trans-retinoic acid for RARs and 9-cis-retinoic acid for RXRs (PMID:10322133). While many details of the molecular actions of the RARs and RXRs in regulating gene transcription are understood (PMID:10418975), tissue-specific synthetic pathway(s) of their ligands has not been adequately defined. Nevertheless, the therapeutic efficacy of retinoids, including 9-cis-retinoic acid, is well established in both tissue culture and animal models of breast cancer (PMID:8825126, PMID:12743994). In vivo, 9-cis-retinal is formed through oxidation of 9-cis-retinol by cis-retinol dehydrogenase (cRDH). (PMID: 15572038). The generation of retinoic acid from retinol is a two-step reaction, with the rate-limiting step being the oxidation of retinol into the intermediate retinaldehyde. Two classes of D020011 - Protective Agents > D000975 - Antioxidants > D002338 - Carotenoids
13-cis-Retinoic acid
13-cis-Retinoic acid is a topical dermatologic agent that is used in the treatment of acne vulgaris and several other skin diseases. The drug has teratogenic and other adverse effects (PubChem). 13-cis-Retinoic acid is also a naturally occurring retinoid that is present in the circulation. Although 13-cis-retinoic acid (isotretinoin) does not have the potent gene regulatory activity of other isomers, it is an effective pharmacologic agent for treating a variety of dermatologic conditions (PMID:11606944). The steric conversion of 13-cis-retinoic acid (13-cRA) to all-trans-retinoic acid (t-RA) has been proposed as an activation mechanism for the observed therapeutic and teratogenic activities of 13-cRA (PMID:9806904). 13-cis Retinoic acid exerts its specific activity on human sebocytes through selective intracellular isomerization to all-trans retinoic acid and binding to retinoid acid receptors (PMID:10951254). A topical dermatologic agent that is used in the treatment of acne vulgaris and several other skin diseases. The drug has teratogenic and other adverse effects. (PubChem) D - Dermatologicals > D10 - Anti-acne preparations > D10A - Anti-acne preparations for topical use > D10AD - Retinoids for topical use in acne D - Dermatologicals > D10 - Anti-acne preparations > D10B - Anti-acne preparations for systemic use > D10BA - Retinoids for treatment of acne C274 - Antineoplastic Agent > C2122 - Cell Differentiating Agent > C1934 - Differentiation Inducer C274 - Antineoplastic Agent > C163758 - Targeted Therapy Agent > C804 - Retinoic Acid Agent C308 - Immunotherapeutic Agent > C129820 - Antineoplastic Immunomodulating Agent COVID info from clinicaltrial, clinicaltrials, clinical trial, clinical trials D020011 - Protective Agents > D000975 - Antioxidants > D002338 - Carotenoids D009676 - Noxae > D013723 - Teratogens D003879 - Dermatologic Agents Corona-virus Coronavirus SARS-CoV-2 COVID-19 SARS-CoV COVID19 SARS2 SARS
13-cis Retinol
13-cis Retinol is a retinoid inapplicable to the visual processes, and therefore it could be an important catabolic metabolite and its biosynthesis could be part of a process involved in regulating 11-cis-retinol concentrations within the retinal pigment epithelium of 11-cis-retinol dehydrogenase. 13-cis Retinol accumulates as a consequence of reduced 11-cis-retinol oxidation capacity. Reduced 11-cis-retinol oxidation occurs in 11-cis-Retinol dehydrogenase deficiency. Mutations in the 11-cis-retinol dehydrogenase gene in humans have been associated with fundus albipunctatus (delayed dark adaptation and punctata are typical symptoms of this human hereditary ocular disease). (PMID: 10825191). COVID info from COVID-19 Disease Map Corona-virus Coronavirus SARS-CoV-2 COVID-19 SARS-CoV COVID19 SARS2 SARS
Apo-15-zeaxanthinal
Apo-15-zeaxanthinal, also known as (-)-(R)-all-trans-3-hydroxyretinal, is a member of the class of compounds known as retinoids. Retinoids are oxygenated derivatives of 3,7-dimethyl-1-(2,6,6-trimethylcyclohex-1-enyl)nona-1,3,5,7-tetraene and derivatives thereof. Thus, apo-15-zeaxanthinal is considered to be an isoprenoid lipid molecule. Apo-15-zeaxanthinal is practically insoluble (in water) and an extremely weak acidic compound (based on its pKa). Apo-15-zeaxanthinal can be found in a number of food items such as red bell pepper, pepper (c. annuum), green bell pepper, and italian sweet red pepper, which makes apo-15-zeaxanthinal a potential biomarker for the consumption of these food products.
Bexarotene
Bexarotene is only found in individuals that have used or taken this drug. It is an antineoplastic agent indicated by the FDA for Cutaneous T cell lymphoma. It has been used off-label for lung cancer, breast cancer, and Kaposis sarcoma (Wikipedia). Bexarotene selectively binds with and activates retinoid X receptor subtypes. There are three subtypes in total: RXRα, RXRβ, RXRγ. The exact mechanism of action of bexarotene in the treatment of CTCL is unknown but the drug has activity in all clinical stages of CTCL. L - Antineoplastic and immunomodulating agents > L01 - Antineoplastic agents > L01X - Other antineoplastic agents > L01XF - Retinoids for cancer treatment C274 - Antineoplastic Agent > C2122 - Cell Differentiating Agent > C1934 - Differentiation Inducer C274 - Antineoplastic Agent > C163758 - Targeted Therapy Agent > C804 - Retinoic Acid Agent C308 - Immunotherapeutic Agent > C129820 - Antineoplastic Immunomodulating Agent D000970 - Antineoplastic Agents
3 alpha,7 alpha,24-Trihydroxy-5beta-cholestanoyl-CoA
3 alpha,7 alpha,24-Trihydroxy-5beta-cholestanoyl-CoA is found in the primary bile acid biosynthesis pathway. 3 alpha,7 alpha,24-Trihydroxy-5beta-cholestanoyl-CoA is created from 3 alpha,7 alpha-Dihydroxy-5beta-cholest-24-enoyl-CoA through the action of HSD17B4 (EC4.2.1.107). 3 alpha,7 alpha,24-Trihydroxy-5beta-cholestanoyl-CoA is then converted to 3 alpha,7 alpha-Dihydroxy-5beta-24-oxocholestanoyl-CoA by HSD17B4 (EC1.1.1.35).
4-oxo-Retinoic acid
4-oxo-Retinoic acid is a biologically active geometric isomer of retinoic acid (RA). 4-oxo-retinoic acid is generated from its precursor canthaxanthin and enhances gap junctional communication in cells. Metabolic transformation of all-trans RA to 4-hydroxylated RA appears to be primarily catalyzed by the cytochrome P 450 (CYP) 26AI in human skin cells. Cellular levels of all-trans RA are meticulously regulated utilizing an array of systems to balance uptake, biosynthesis, catabolism, and efflux transport. RA is a critical regulator of gene expression during embryonic development and in the maintenance of adult epithelial tissues. (PMID: 8794203, 7893159, 17330217, 16778795, 17460545) [HMDB] 4-oxo-Retinoic acid is a biologically active geometric isomer of retinoic acid (RA). 4-oxo-retinoic acid is generated from its precursor canthaxanthin and enhances gap junctional communication in cells. Metabolic transformation of all-trans RA to 4-hydroxylated RA appears to be primarily catalyzed by the cytochrome P 450 (CYP) 26AI in human skin cells. Cellular levels of all-trans RA are meticulously regulated utilizing an array of systems to balance uptake, biosynthesis, catabolism, and efflux transport. RA is a critical regulator of gene expression during embryonic development and in the maintenance of adult epithelial tissues. (PMID: 8794203, 7893159, 17330217, 16778795, 17460545). D020011 - Protective Agents > D000975 - Antioxidants > D002338 - Carotenoids all-trans-4-Oxoretinoic acid, an active metabolite of vitamin A, induces gene transcription via binding to nuclear retinoic acid receptors (RARs).
Vitamin A2
Vitamin A2 is the form, C20H28O, of vitamin A found in the retina and liver of freshwater fishes and certain invertebrates and amphibians; it differs from retinol (vitamin A1) in having one more conjugated double bond and has approximately one-third the biological activity of retinol. Called also retinol2. Constituent of fresh-water fish oils. 3,4-Didehydroretinol is found in fats and oils and fishes. D020011 - Protective Agents > D000975 - Antioxidants > D002338 - Carotenoids
Retinol acetate
Retinol acetate is a dietary supplement, permitted in infant formula Dietary supplement, permitted in infant formulas Retinyl acetate is a synthetic acetate ester form derived from retinol and has potential antineoplastic and chemo preventive activities.
Isoacitretin
Isoacitretin is an oral retinoid effective in the treatment of psoriasis. It is the major metabolite of etretinate with the advantage of a much shorter half-life when compared with etretinate (Pubchem). An oral retinoid effective in the treatment of psoriasis. It is the major metabolite of etretinate with the advantage of a much shorter half-life when compared with etretinate. -- Pubchem [HMDB] D020011 - Protective Agents > D000975 - Antioxidants > D002338 - Carotenoids D003879 - Dermatologic Agents > D007641 - Keratolytic Agents
Adapalene
Adapalene is a topical retinoid primarily used in the treatment of acne and is also used (off-label) to treat keratosis pilaris as well as other skin conditions. It is currently marketed by Galderma under the trade names Differin in some countries, and Adaferin in India. [Wikipedia] D - Dermatologicals > D10 - Anti-acne preparations > D10A - Anti-acne preparations for topical use > D10AD - Retinoids for topical use in acne C274 - Antineoplastic Agent > C2122 - Cell Differentiating Agent > C1934 - Differentiation Inducer C274 - Antineoplastic Agent > C163758 - Targeted Therapy Agent > C804 - Retinoic Acid Agent C308 - Immunotherapeutic Agent > C129820 - Antineoplastic Immunomodulating Agent D018373 - Peripheral Nervous System Agents > D018689 - Sensory System Agents D002491 - Central Nervous System Agents > D000700 - Analgesics D000893 - Anti-Inflammatory Agents D018501 - Antirheumatic Agents D003879 - Dermatologic Agents
Retinyl ester
Retinyl ester is a substrate for Lecithin retinol acyltransferase and Retinal pigment epithelium-specific 65 kDa protein. [HMDB] Retinyl ester is a substrate for Lecithin retinol acyltransferase and Retinal pigment epithelium-specific 65 kDa protein. D020011 - Protective Agents > D000975 - Antioxidants > D002338 - Carotenoids
13-cis-Retinal
13-cis-Retinal is a naturally occurring retinoid. Retinoids are vitamin A analogs that have profound biological activities. Several retinoids have been reported to have antiinflammatory activity in certain animal models of arthritis, such as adjuvant-induced and streptococcal cell wall-induced arthritis in rats. Some retinoids also have been shown to possess antiinftammatory activity in man by their ability to modulate inflammatory diseases of the skin. It has been reported, for example, that retinoid treatment can inhibit neutrophil accumulation in cutaneous disorders such as psoriasis. (PMID: 2123476) [HMDB] 13-cis-Retinal is a naturally occurring retinoid. Retinoids are vitamin A analogs that have profound biological activities. Several retinoids have been reported to have antiinflammatory activity in certain animal models of arthritis, such as adjuvant-induced and streptococcal cell wall-induced arthritis in rats. Some retinoids also have been shown to possess antiinftammatory activity in man by their ability to modulate inflammatory diseases of the skin. It has been reported, for example, that retinoid treatment can inhibit neutrophil accumulation in cutaneous disorders such as psoriasis. (PMID:2123476). D020011 - Protective Agents > D000975 - Antioxidants > D002338 - Carotenoids COVID info from COVID-19 Disease Map Corona-virus Coronavirus SARS-CoV-2 COVID-19 SARS-CoV COVID19 SARS2 SARS
all-trans-18-Hydroxyretinoic acid
all-trans-18-Hydroxyretinoic acid, also known as 18-hydroxyretinoic acid, is classified as a member of the retinoids. Retinoids are oxygenated derivatives of 3,7-dimethyl-1-(2,6,6-trimethylcyclohex-1-enyl)nona-1,3,5,7-tetraene and derivatives thereof. all-trans-18-Hydroxyretinoic acid is considered to be a practically insoluble (in water) and a weakly acidic compound. all-trans-18-Hydroxyretinoic acid is an isoprenoid lipid molecule. Within a cell, all-trans-18-hydroxyretinoic acid is primarily located in the extracellular space and near the membrane. 18-Hydroxyretinoic acid is a metabolite of tretinoin. Tretinoin is the acid form of vitamin A and is also known as all-trans retinoic acid or ATRA. It is a drug commonly used to treat acne vulgaris and keratosis pilaris. It is available as a cream or gel (brand names Aberela, Airol, Renova, Atralin, Retin-A, Avita, Retacnyl, Refissa, or Stieva-A). It is also used to treat acute promyelocytic leukemia (APL) and is sold for this indication by Roche under the brand name Vesanoid. It is also available as a generic. (Wikipedia) A human metabolite taken as a putative food compound of mammalian origin [HMDB]
4-OH-Retinal
4-OH-Retinal is involved in the Vitamin A (retinol) metabolism pathway. In the reaction, retinal is oxidized at the c-4 position to form 4-OH-Retinal, a visual pigment chromophore. [HMDB] 4-OH-Retinal is involved in the Vitamin A (retinol) metabolism pathway. In the reaction, retinal is oxidized at the c-4 position to form 4-OH-Retinal, a visual pigment chromophore.
4-Oxo-13-cis-retinoate
4-oxo-9-cis retinoic acid (4-oxo-9cRA) is identified as a major plasma metabolite of 9-cis retinoic acid. Plasma levels of 4-oxo-9-cRA were initially 71\\% of those of 9cRA, but in contrast to 9cRA, there was no decline in plasma levels.Despite a decline in plasma levels of 9cRA over time, levels of the 4-oxo metabolite tended to persist. While the 4-oxo metabolite is less potent than the parent compound [HMDB] 4-oxo-9-cis retinoic acid (4-oxo-9cRA) is identified as a major plasma metabolite of 9-cis retinoic acid. Plasma levels of 4-oxo-9-cRA were initially 71\\% of those of 9cRA, but in contrast to 9cRA, there was no decline in plasma levels.Despite a decline in plasma levels of 9cRA over time, levels of the 4-oxo metabolite tended to persist. While the 4-oxo metabolite is less potent than the parent compound.
4-Oxoretinal
4-Oxoretinal is a predominant retinoids during morphogenesis in mouse skin in vivo. Topical 4-oxoretinal and 4-oxoretinol promoted significant epidermal hyperplasia and metaplasia in mouse tail. They induced a moderate response for epidermal inflammation, compared with retinal, whereas neither 4-oxoretinal nor 4-oxoretinol prevented menadione-induced epidermal lipid peroxidation, unlike retinal and retinol. As analyzed by quantitative PCR, 4-oxoretinal and 4-oxoretinol did not reproduce the significant increased expression of genes coding for keratin 4, amphiregulin, heparin-EGF and CYP26A1, that did induce retinal and retinol. However, both retinal and 4-oxoretinal significantly inhibited the lipopolysaccharide-induced maturation of human dendritic cells in vitro. As analyzed in vivo and in vitro, 4-oxoretinal and 4-oxoretinol were not converted into retinoic acid. We conclude that 4-oxoretinal and 4-oxoretinol exert a moderate direct retinoid-like activity in vivo, thus confirming previous in vitro studies in amphibians showing 4-oxometabolites of vitamin A as bioactive agents rather than inactive catabolites. [HMDB] 4-Oxoretinal is a predominant retinoids during morphogenesis in mouse skin in vivo. Topical 4-oxoretinal and 4-oxoretinol promoted significant epidermal hyperplasia and metaplasia in mouse tail. They induced a moderate response for epidermal inflammation, compared with retinal, whereas neither 4-oxoretinal nor 4-oxoretinol prevented menadione-induced epidermal lipid peroxidation, unlike retinal and retinol. As analyzed by quantitative PCR, 4-oxoretinal and 4-oxoretinol did not reproduce the significant increased expression of genes coding for keratin 4, amphiregulin, heparin-EGF and CYP26A1, that did induce retinal and retinol. However, both retinal and 4-oxoretinal significantly inhibited the lipopolysaccharide-induced maturation of human dendritic cells in vitro. As analyzed in vivo and in vitro, 4-oxoretinal and 4-oxoretinol were not converted into retinoic acid. We conclude that 4-oxoretinal and 4-oxoretinol exert a moderate direct retinoid-like activity in vivo, thus confirming previous in vitro studies in amphibians showing 4-oxometabolites of vitamin A as bioactive agents rather than inactive catabolites.
9,13-cis-Retinoic acid
9,13-cis-Retinoic acid belongs to the class of organic compounds known as retinoids. These are oxygenated derivatives of 3,7-dimethyl-1-(2,6,6-trimethylcyclohex-1-enyl)nona-1,3,5,7-tetraene and derivatives thereof. Retinoids (vitamin A and its analogs) are essential dietary substances that are needed by mammals for reproduction, normal embryogenesis, growth, vision, and maintaining normal cellular differentiation and the integrity of the immune system. Within cells, retinoids regulate gene transcription acting through ligand-dependent transcription factors, the retinoic acid receptors (RARs), and the retinoid X receptors (RXRs). Tretinoin, also known as all-trans-retinoic acid (ATRA), is a naturally occurring derivative of vitamin A (retinol). Retinoids such as tretinoin are important regulators of cell reproduction, proliferation, and differentiation and are used to treat acne and photodamaged skin and to manage keratinization disorders such as ichthyosis and keratosis follicularis. Tretinoin also represents the class of anticancer drugs called differentiating agents and is used in the treatment of acute promyelocytic leukemia (APL). [HMDB] L - Antineoplastic and immunomodulating agents > L01 - Antineoplastic agents > L01X - Other antineoplastic agents > L01XF - Retinoids for cancer treatment D - Dermatologicals > D10 - Anti-acne preparations > D10A - Anti-acne preparations for topical use > D10AD - Retinoids for topical use in acne C274 - Antineoplastic Agent > C2122 - Cell Differentiating Agent > C1934 - Differentiation Inducer C274 - Antineoplastic Agent > C163758 - Targeted Therapy Agent > C804 - Retinoic Acid Agent C308 - Immunotherapeutic Agent > C129820 - Antineoplastic Immunomodulating Agent D020011 - Protective Agents > D000975 - Antioxidants > D002338 - Carotenoids D003879 - Dermatologic Agents > D007641 - Keratolytic Agents D000970 - Antineoplastic Agents Retinoic acid is a metabolite of vitamin A that plays important roles in cell growth, differentiation, and organogenesis. Retinoic acid is a natural agonist of RAR nuclear receptors, with IC50s of 14 nM for RARα/β/γ. Retinoic acid bind to PPARβ/δ with Kd of 17 nM. Retinoic acid acts as an inhibitor of transcription factor Nrf2 through activation of retinoic acid receptor alpha. Retinoic acid is a metabolite of vitamin A that plays important roles in cell growth, differentiation, and organogenesis. Retinoic acid is a natural agonist of RAR nuclear receptors, with IC50s of 14 nM for RARα/β/γ. Retinoic acid bind to PPARβ/δ with Kd of 17 nM. Retinoic acid acts as an inhibitor of transcription factor Nrf2 through activation of retinoic acid receptor alpha. Retinoic acid is a metabolite of vitamin A that plays important roles in cell growth, differentiation, and organogenesis. Retinoic acid is a natural agonist of RAR nuclear receptors, with IC50s of 14 nM for RARα/β/γ. Retinoic acid bind to PPARβ/δ with Kd of 17 nM. Retinoic acid acts as an inhibitor of transcription factor Nrf2 through activation of retinoic acid receptor alpha.
Acitretin
Acitretin is only found in individuals that have used or taken this drug. It is an oral retinoid effective in the treatment of psoriasis. It is the major metabolite of etretinate with the advantage of a much shorter half-life when compared with etretinate (PubChem). The mechanism of action of acitretin is unknown, however it is believed to work by targeting specific receptors (retinoid receptors such as RXR and RAR) in the skin which help normalize the growth cycle of skin cells. An oral retinoid effective in the treatment of psoriasis. It is the major metabolite of etretinate with the advantage of a much shorter half-life when compared with etretinate. -- Pubchem [HMDB] D - Dermatologicals > D05 - Antipsoriatics > D05B - Antipsoriatics for systemic use > D05BB - Retinoids for treatment of psoriasis C274 - Antineoplastic Agent > C2122 - Cell Differentiating Agent > C1934 - Differentiation Inducer C274 - Antineoplastic Agent > C163758 - Targeted Therapy Agent > C804 - Retinoic Acid Agent C308 - Immunotherapeutic Agent > C129820 - Antineoplastic Immunomodulating Agent D020011 - Protective Agents > D000975 - Antioxidants > D002338 - Carotenoids D003879 - Dermatologic Agents > D007641 - Keratolytic Agents
all-trans-3,4-Didehydroretinoate
This compound belongs to the family of Retinoids. These are compounds that is related to vitamin A, especially retinol. D020011 - Protective Agents > D000975 - Antioxidants > D002338 - Carotenoids
4-Hydroxy-all-trans-retinyl acetate
This compound belongs to the family of Retinoids. These are compounds that is related to vitamin A, especially retinol.
5,6-Epoxy-13-cis-retinoic acid
5,6-Epoxy-13-cis-retinoic acid is an oxygenated metabolite of 13-cis-retinoic acid. It is formed from the hydroperoxide-dependent co-oxidation of 13-cis-retinoic acid by prostaglandin H (PGH) synthase (PMID: 3115987).
5,8-Epoxy-13-cis-retinoic acid
5,8-Epoxy-13-cis-retinoic acid is an oxygenated metabolite of 13-cis-retinoic acid. It is formed from the hydroperoxide-dependent co-oxidation of 13-cis-retinoic acid by prostaglandin H (PGH) synthase (PMID: 3115987).
N-(4-Hydroxyphenyl)-3,7-dimethyl-9-(2,6,6-trimethyl-1-cyclohexenyl)nona-2,4,6,8-tetraenamide
C26H33NO2 (391.25111580000004)
(2Z,4E,6E,8E)-3,7-Dimethyl-9-(2,6,6-trimethylcyclohex-1-en-1-yl)nona-2,4,6,8-tetraenal
3,7-Dimethyl-9-(2,6,6-trimethylcyclohex-1-en-1-yl)nona-2,4,6,8-tetraenoic acid
14(R)-Hydroxy-retro-vitamin A
3,4-Didehydroretinol Acetate
4-Oxofenretinide
4-Hprog
All-trans 4-Keto Retinoic Acid
9-cis Retinol Acetate
Retinyl acetate is a synthetic acetate ester form derived from retinol and has potential antineoplastic and chemo preventive activities.
3,7-Dimethyl-9-(2,6,6-trimethylcyclohexen-1-yl)nona-2,4,6,8-tetraenamide
Ctp3 peptide
N-Ethylretinamide
Hydroxyethyl retinamide
C22H33NO2 (343.25111580000004)