Target type: biologicalprocess
Any process that increases the frequency, rate or extent of thyroid hormone mediated signaling pathway. [GOC:hjd]
The positive regulation of thyroid hormone mediated signaling pathway involves a complex and tightly regulated cascade of events that control cellular responses to thyroid hormones. These hormones, triiodothyronine (T3) and thyroxine (T4), are essential for various physiological processes, including metabolism, growth, and development. The pathway can be broadly divided into three key stages:
1. **Hormone Synthesis and Release:** Thyroid hormones are produced by the thyroid gland, a butterfly-shaped structure located in the neck. The process begins with the uptake of iodide from the bloodstream into thyroid follicular cells. Iodide is then oxidized and attached to tyrosine residues on thyroglobulin, a large protein synthesized by the thyroid gland. This process results in the formation of monoiodotyrosine (MIT) and diiodotyrosine (DIT). Through coupling reactions, MIT and DIT molecules combine to form T3 (one MIT and one DIT) and T4 (two DITs). T3 and T4 are stored within the thyroid gland and released into the bloodstream in response to specific signals, primarily thyroid-stimulating hormone (TSH) secreted from the pituitary gland.
2. **Hormone Transport and Binding:** T3 and T4 are transported in the bloodstream bound to carrier proteins, primarily thyroxine-binding globulin (TBG), albumin, and transthyretin. This binding helps to maintain hormone stability and prevent rapid degradation. However, only the free, unbound forms of T3 and T4 can enter target cells. Once inside cells, T3 and T4 bind to their nuclear receptors, known as thyroid hormone receptors (TRs). TRs are transcription factors that regulate the expression of target genes. There are two main isoforms of TRs: TRα and TRβ. Each isoform has multiple subtypes, with different tissue distributions and functions.
3. **Signal Transduction and Gene Regulation:** T3 binds to TRs with higher affinity than T4, and it is considered the primary active form of thyroid hormone. Upon T3 binding, TRs undergo a conformational change, dimerizing with other TRs or retinoid X receptors (RXRs). This dimerization allows the TRs to bind to specific DNA sequences known as thyroid hormone response elements (TREs) located in the promoter regions of target genes. Binding of the TR-RXR complex to TREs promotes or inhibits gene transcription, depending on the context. This transcriptional regulation leads to the expression of various proteins that mediate the diverse biological effects of thyroid hormones.
The positive regulation of this pathway involves processes that enhance the synthesis, release, transport, or action of thyroid hormones. These processes can be triggered by various stimuli, including:
* **Increased TSH production:** TSH stimulates the synthesis and release of thyroid hormones from the thyroid gland.
* **Increased iodide uptake:** Stimulation of the sodium-iodide symporter (NIS) enhances iodide uptake into thyroid follicular cells.
* **Increased thyroglobulin synthesis:** Increased thyroglobulin production provides more substrate for thyroid hormone synthesis.
* **Increased TR expression:** Enhanced TR expression can increase the sensitivity of cells to thyroid hormones.
* **Increased TR activity:** Factors that activate or stabilize TRs can enhance their transcriptional activity.
* **Increased cofactor binding:** Certain cofactors can enhance the binding of TRs to TREs and promote gene expression.
* **Decreased degradation:** Processes that reduce the breakdown of thyroid hormones can increase their levels and activity.
Understanding the positive regulation of the thyroid hormone mediated signaling pathway is crucial for comprehending the mechanisms underlying thyroid hormone function and for developing strategies to address thyroid-related disorders. This pathway plays a critical role in maintaining metabolic homeostasis, regulating growth and development, and ensuring normal cognitive function.'"
| Protein | Definition | Taxonomy |
|---|---|---|
| Thyroid hormone receptor alpha | A thyroid hormone receptor alpha that is encoded in the genome of chicken. [OMA:P04625, PRO:DNx] | Gallus gallus (chicken) |
| Retinoic acid receptor RXR-alpha | A retinoic acid receptor RXR-alpha that is encoded in the genome of human. [PRO:DNx, UniProtKB:P19793] | Homo sapiens (human) |
| Thyroid hormone receptor beta | A thyroid hormone receptor beta that is encoded in the genome of human. [PRO:DNx, UniProtKB:P10828] | Homo sapiens (human) |
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| amiodarone | amiodarone : A member of the class of 1-benzofurans that is 1-benzofuran substituted by a butyl group at position 2 and a 4-[2-(diethylamino)ethoxy]-3,5-diiodobenzoyl group at position 3. It is a cardiovascular drug used for the treatment of cardiac dysrhythmias. Amiodarone: An antianginal and class III antiarrhythmic drug. It increases the duration of ventricular and atrial muscle action by inhibiting POTASSIUM CHANNELS and VOLTAGE-GATED SODIUM CHANNELS. There is a resulting decrease in heart rate and in vascular resistance. | 1-benzofurans; aromatic ketone; organoiodine compound; tertiary amino compound | cardiovascular drug |
| domperidone | domperidone : 1-[3-(Piperidin-1-yl)propyl]-1,3-dihydro-2H-benzimidazol-2-one in which the 4-position of the piperidine ring is substituted by a 5-chloro-1,3-dihydro-2H-benzimidazol-2-on-1-yl group. A dopamine antagonist, it is used as an antiemetic for the short-term treatment of nausea and vomiting, and to control gastrointestinal effects of dopaminergic drugs given in the management of parkinsonism. The free base is used in oral suspensions, while the maleate salt is used in tablet preparations. Domperidone: A specific blocker of dopamine receptors. It speeds gastrointestinal peristalsis, causes prolactin release, and is used as antiemetic and tool in the study of dopaminergic mechanisms. | benzimidazoles; heteroarylpiperidine | antiemetic; dopaminergic antagonist |
| lg 100268 | LG 100268: a retinoid X receptor (RXR) selective compound; structure given in first source | ||
| oxaprozin | oxaprozin : A monocarboxylic acid that is a propionic acid derivative having a 4,5-diphenyl-1,3-oxazol-2-yl substituent at position 3. It is non-steroidal anti-inflammatory drug commonly used to relieve the pain and inflammatory responses associated with osteoarthritis and rheumatoid arthritis. Oxaprozin: An oxazole-propionic acid derivative, cyclooxygenase inhibitor, and non-steroidal anti-inflammatory drug that is used in the treatment of pain and inflammation associated with of OSTEOARTHRITIS; RHEUMATOID ARTHRITIS; and ARTHRITIS, JUVENILE. | 1,3-oxazoles; monocarboxylic acid | analgesic; non-steroidal anti-inflammatory drug |
| pirinixic acid | pirinixic acid: structure | aryl sulfide; organochlorine compound; pyrimidines | |
| 3,3',5-triiodothyroacetic acid | tiratricol : A monocarboxylic acid that is (4-hydroxy-3,5-diiodophenyl)acetic acid in which the phenolic hydroxy group has been replaced by a 4-hydroxy-3-iodophenoxy group. It is a thyroid hormone analogue that has been used in the treatment of thyroid hormone resistance syndrome. | ||
| 3,3',5-triiodothyropropionic acid | aromatic ether | ||
| thyroxine | thyroxine : An iodothyronine compound having iodo substituents at the 3-, 3'-, 5- and 5'-positions. Thyroxine: The major hormone derived from the thyroid gland. Thyroxine is synthesized via the iodination of tyrosines (MONOIODOTYROSINE) and the coupling of iodotyrosines (DIIODOTYROSINE) in the THYROGLOBULIN. Thyroxine is released from thyroglobulin by proteolysis and secreted into the blood. Thyroxine is peripherally deiodinated to form TRIIODOTHYRONINE which exerts a broad spectrum of stimulatory effects on cell metabolism. | 2-halophenol; iodophenol; L-phenylalanine derivative; non-proteinogenic L-alpha-amino acid; thyroxine; thyroxine zwitterion | antithyroid drug; human metabolite; mouse metabolite; thyroid hormone |
| triiodothyronine | 3,3',5-triiodo-L-thyronine : An iodothyronine compound having iodo substituents at the 3-, 3'- and 5-positions. Although some is produced in the thyroid, most of the 3,3',5-triiodo-L-thyronine in the body is generated by mono-deiodination of L-thyroxine in the peripheral tissues. Its metabolic activity is about 3 to 5 times that of L-thyroxine. The sodium salt is used in the treatment of hypothyroidism. Triiodothyronine: A T3 thyroid hormone normally synthesized and secreted by the thyroid gland in much smaller quantities than thyroxine (T4). Most T3 is derived from peripheral monodeiodination of T4 at the 5' position of the outer ring of the iodothyronine nucleus. The hormone finally delivered and used by the tissues is mainly T3. | 2-halophenol; amino acid zwitterion; iodophenol; iodothyronine | human metabolite; mouse metabolite; thyroid hormone |
| Berberine chloride (TN) | organic molecular entity | ||
| mifepristone | Mifepristone: A progestational and glucocorticoid hormone antagonist. Its inhibition of progesterone induces bleeding during the luteal phase and in early pregnancy by releasing endogenous prostaglandins from the endometrium or decidua. As a glucocorticoid receptor antagonist, the drug has been used to treat hypercortisolism in patients with nonpituitary CUSHING SYNDROME. | 3-oxo-Delta(4) steroid; acetylenic compound; tertiary amino compound | abortifacient; contraceptive drug; hormone antagonist; synthetic oral contraceptive |
| pioglitazone hydrochloride | aromatic ether | ||
| tetraiodothyroacetic acid | 3,3',5,5'-tetraiodothyroacetic acid : A monocarboxylic acid that is thyroacetic acid carrying four iodo substituents at positions 3, 3', 5 and 5'. tetraiodothyroacetic acid: RN given refers to parent cpd; structure | 2-halophenol; aromatic ether; iodophenol; monocarboxylic acid | apoptosis inducer; human metabolite; thyroid hormone |
| honokiol | biphenyls | ||
| bexarotene | benzoic acids; naphthalenes; retinoid | antineoplastic agent | |
| dehydroabietic acid | dehydroabietate : A monocarboxylic acid anion that is the conjugate base of dehydroabietic acid, obtained by deprotonation of the carboxy group. dehydroabietic acid : An abietane diterpenoid that is abieta-8,11,13-triene substituted at position 18 by a carboxy group. dehydroabietic acid: major aquatic toxicant in effluent of pulp and paper mills | abietane diterpenoid; carbotricyclic compound; monocarboxylic acid | allergen; metabolite |
| desethylamiodarone | desethylamiodarone: metabolite of amiodarone; structure given in first source | aromatic ketone | |
| 3,5-dimethyl-3'-isopropyl-l-thyronine | 3,5-dimethyl-3'-isopropyl-L-thyronine: RN given refers to (L)-isomer | ||
| di-n-desethylamiodarone | di-N-desethylamiodarone: amiodarone metabolite in dogs; structure given in first source | ||
| sr 11237 | SR 11237: structure given in first source | ||
| hx 600 | HX 600: structure given in first source | ||
| 6-(1,2,3,4-tetrahydro-1,1,4,4-tetramethyl-6-naphthyl)-2-naphthalenecarboxylic acid | 6-(1,2,3,4-tetrahydro-1,1,4,4-tetramethyl-6-naphthyl)-2-naphthalenecarboxylic acid: reverses keratinization process in hamster tracheal organ culture; inhibits induction of ornithine decarboxylase; structure & RN given in first source; RN not in Chemline 12/5/83 | ||
| isopimaric acid | isopimaric acid: isolated from the bark of Illicium jadifengpi | carbotricyclic compound; diterpenoid; monocarboxylic acid | |
| tretinoin | all-trans-retinoic acid : A retinoic acid in which all four exocyclic double bonds have E- (trans-) geometry. retinoic acid : A retinoid consisting of 3,7-dimethylnona-2,4,6,8-tetraenoic acid substituted at position 9 by a 2,6,6-trimethylcyclohex-1-en-1-yl group (geometry of the four exocyclic double bonds is not specified). Tretinoin: 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). | retinoic acid; vitamin A | anti-inflammatory agent; antineoplastic agent; antioxidant; AP-1 antagonist; human metabolite; keratolytic drug; retinoic acid receptor agonist; retinoid X receptor agonist; signalling molecule |
| docosahexaenoate | all-cis-docosa-4,7,10,13,16,19-hexaenoic acid : A docosahexaenoic acid having six cis-double bonds at positions 4, 7, 10, 13, 16 and 19. docosahexaenoate : A polyunsaturated fatty acid anion that is the conjugate base of docosahexaenoic acid, obtained by deprotonation of the carboxy group; major species at pH 7.3. docosahexaenoic acid : Any C22 polyunsaturated fatty acid containing six double bonds. efalex: a mixture of fish oil and primrose oil; used as a high-docosahexaenoic acid fatty acid supplement | docosahexaenoic acid; omega-3 fatty acid | algal metabolite; antineoplastic agent; Daphnia tenebrosa metabolite; human metabolite; mouse metabolite; nutraceutical |
| eicosapentaenoic acid | all-cis-5,8,11,14,17-icosapentaenoic acid : An icosapentaenoic acid having five cis-double bonds at positions 5, 8, 11, 14 and 17. icosapentaenoic acid : Any straight-chain, C20 polyunsaturated fatty acid having five C=C double bonds. | icosapentaenoic acid; omega-3 fatty acid | anticholesteremic drug; antidepressant; antineoplastic agent; Daphnia galeata metabolite; fungal metabolite; micronutrient; mouse metabolite; nutraceutical |
| gw 3965 | GW 3965: a liver X receptor ligand | diarylmethane | |
| t0901317 | T0901317: an LXRalpha and LXRbeta agonist | ||
| alitretinoin | Alitretinoin: A retinoid that is used for the treatment of chronic hand ECZEMA unresponsive to topical CORTICOSTEROIDS. It is also used to treat cutaneous lesions associated with AIDS-related KAPOSI SARCOMA. | retinoic acid | antineoplastic agent; keratolytic drug; metabolite; retinoid X receptor agonist |
| sulindac | sulindac : A monocarboxylic acid that is 1-benzylidene-1H-indene which is substituted at positions 2, 3, and 5 by methyl, carboxymethyl, and fluorine respectively, and in which the phenyl group of the benzylidene moiety is substituted at the para position by a methylsulfinyl group. It is a prodrug for the corresponding sulfide, a non-steroidal anti-inflammatory drug, used particularly in the treatment of acute and chronic inflammatory conditions. Sulindac: A sulfinylindene derivative prodrug whose sulfinyl moiety is converted in vivo to an active NSAID analgesic. Specifically, the prodrug is converted by liver enzymes to a sulfide which is excreted in the bile and then reabsorbed from the intestine. This helps to maintain constant blood levels with reduced gastrointestinal side effects. | monocarboxylic acid; organofluorine compound; sulfoxide | analgesic; antineoplastic agent; antipyretic; apoptosis inducer; EC 1.14.99.1 (prostaglandin-endoperoxide synthase) inhibitor; non-narcotic analgesic; non-steroidal anti-inflammatory drug; prodrug; tocolytic agent |
| sr 11217 | SR 11217: structure given in first source | ||
| bigelovin | bigelovin : A sesquiterpene lactone that is 3,3a,4,4a,7a,8,9,9a-octahydroazuleno[6,5-b]furan-2,5-dione substituted by methyl groups at positions 4a and 8, a methylidene group at position 3 and an acetoxy group at position 4. Isolated from Inula hupehensis, it exhibits antineoplastic activity. bigelovin: a potent cytotoxic sesquiterpene lactone from Inula sp.; structure given in first source; RN refers to (3aR-(3aalpha,4alpha,4abeta,7aalpha,8alpha,9abeta))-isomer | acetate ester; cyclic ketone; gamma-lactone; organic heterotricyclic compound; sesquiterpene lactone | antineoplastic agent; apoptosis inducer; immunomodulator; plant metabolite |
| calcitriol | dihydroxy-vitamin D3: as a major in vitro metabolite of 1alpha,25-dihydroxyvitamin D3, produced in primary cultures of neonatal human keratinocytes | D3 vitamins; hydroxycalciol; triol | antineoplastic agent; antipsoriatic; bone density conservation agent; calcium channel agonist; calcium channel modulator; hormone; human metabolite; immunomodulator; metabolite; mouse metabolite; nutraceutical |
| clothiapine | maleate salt | ||
| nk 104 | pitavastatin calcium : The calcium salt of pitavastatin. Used for treatment of hypercholesterolemia (elevated levels of cholesterol in the blood) on patients unable to sufficiently lower their cholesterol levels by diet and exercise. | calcium salt; statin (synthetic) | antioxidant |
| lg 100567 | ALRT 1550: ALRT1550 is (2E,4E,6E)-isomer; LG100567 is (2E,4E,6Z)-isomer; structure given in first source | ||
| fenretinide | 4-hydroxyphenyl retinamide : A retinoid obtained by formal condensation of the carboxy group of all-trans retinoic acid and the anilino group of 4-hydroxyaniline. Synthetic retinoid agonist. Antiproliferative, antioxidant and anticancer agent with a long half-life in vivo. Apoptotic effects appear to be mediated by a mechanism distinct from that of 'classical' retinoids. Fenretinide: A synthetic retinoid that is used orally as a chemopreventive against prostate cancer and in women at risk of developing contralateral breast cancer. It is also effective as an antineoplastic agent. | monocarboxylic acid amide; retinoid | antineoplastic agent; antioxidant |
| 4-(2-(5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-2-naphthalenyl)-1-propenyl)benzoic acid | 4-(2-(5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-2-naphthalenyl)-1-propenyl)benzoic acid: RN refers to (E)-isomer; structure given in first source arotinoid acid : A retinoid that consists of benzoic acid substituted at position 4 by a 2-(5,5,8,8-tetramethyl-5,6,7,8-tetrahydronaphthalen-2-yl)prop-1-en-1-yl group. It is a synthetic retinoid that acts as a selective agonist for the retinoic acid receptors (RAR). | benzoic acids; naphthalenes; retinoid | antineoplastic agent; retinoic acid receptor agonist; teratogenic agent |
| (6E)-7-[3-(4-fluorophenyl)-1-(propan-2-yl)-1H-indol-2-yl]-3,5-dihydroxyhept-6-enoic acid | (6E)-7-[3-(4-fluorophenyl)-1-(propan-2-yl)-1H-indol-2-yl]-3,5-dihydroxyhept-6-enoic acid : A dihydroxy monocarboxylic acid that is N-isopropylindole which is substituted at position 3 by a p-fluorophenyl group and at position 2 by a 6-carboxy-3,5-dihydroxyhex-1-en-1-yl group. It has four possible diastereoisomers. | dihydroxy monocarboxylic acid; indoles; organofluorine compound | |
| agn 191659 | AGN 191659: a retinoid x receptor pan-agonist; structure in first source | ||
| agn 191701 | AGN 191701: retinoid X receptors agonist; RN refers to (E)-isomer; structure given in first source | ||
| pregna-4,17-diene-3,16-dione | pregna-4,17-diene-3,16-dione: steroid from guggulu extract; RN & N1 from C1 Form index; RN given refers to cpd without isomeric designation; structure in first source; antagonist of farnesoid X receptor | 3-hydroxy steroid | androgen |
| valerenic acid | valerenic acid : A monocarboxylic acid that is 2-methylprop-2-enoic acid which is substituted at position 3 by a 3,7-dimethyl-2,4,5,6,7,7a-hexahydro-1H-inden-4-yl group. A bicyclic sesquiterpenoid constituent of the essential oil of the Valerian plant. valerenic acid: a saturated oplopanone type indene from Valeriana officinalis | carbobicyclic compound; monocarboxylic acid; sesquiterpenoid | GABA modulator; plant metabolite; sedative; volatile oil component |
| lg100754 | LG 100754: retinoic acid receptors antagonist & agonist; a mixed function retinoid whose activity is dimer-selective; structure given in first source | ||
| lg 1506 | |||
| gc 1 compound | GC 1 compound: structure in first source | diarylmethane | |
| nrx 194204 | IRX4204: retinoid X receptor (RXR) agonist; structure in first source | ||
| agn 194204 | AGN 194204: a retinoid X receptor ligand; structure in first source | ||
| kb 141 | KB 141: an anticholesteremic agent; structure in first source | ||
| kb 130015 | KB 130015: structure in first source | ||
| cgs 23425 | CGS 23425: structure given in first source | ||
| bms453 | BMS 189453: structure in first source BMS-453 : A member of the class of dihydronaphthalenes that is 1,2-dihydronaphthalene which is substituted at positions 1, 1, 4, and 6 by methyl, methyl, phenyl, and 2-(p-carboxyphenyl)vinyl groups, respectively (the E isomer). It is a potent retinoic acid receptor gamma (RARbeta) agonist that acts as an antagonist against RARalpha and RARgamma. | benzoic acids; dihydronaphthalenes; stilbenoid | retinoic acid receptor alpha antagonist; retinoic acid receptor beta agonist; retinoic acid receptor gamma antagonist; teratogenic agent |
| hx 630 | HX 630: a retinoid X receptor ligand that functions as both an RAR synergist and peroxisome proliferator-activated receptor gamma synergist; structure in first source | ||
| uab 30 | |||
| 3,5-dibromo-4-(4-hydroxy-3-isopropylphenoxy)phenylacetic acid | 3,5-dibromo-4-(4-hydroxy-3-isopropylphenoxy)phenylacetic acid: a thyroid receptor beta1 agonist; structure in first source | ||
| sr 11302 | SR 11302: structure given in first source SR11302 : A retinoid that is all-trans-retinoic acid in which the methyl group at position 9 is replaced by a 4-methylphenyl group. It is an inhibitor of activator protein-1 which exhibits antitumour effects in vivo. | alpha,beta-unsaturated monocarboxylic acid; retinoid; toluenes | antineoplastic agent; AP-1 antagonist |
| kb 2115 | 3-((3,5-dibromo-4-(4-hydroxy-3-(1-methylethyl)phenoxy)phenyl)amino)-3-oxopropanoic acid: a thyroid hormone receptor agonist with anticholesteremic activity | ||
| fg-4592 | roxadustat : An N-acylglycine resulting from the formal condensation of the amino group of glycine with the carboxy group of 4-hydroxy-1-methyl-7-phenoxyisoquinoline-3-carboxylic acid. It is an inhibitor of hypoxia inducible factor prolyl hydroxylase (HIF-PH). roxadustat: structure in first source | aromatic ether; isoquinolines; N-acylglycine | EC 1.14.11.2 (procollagen-proline dioxygenase) inhibitor; EC 1.14.11.29 (hypoxia-inducible factor-proline dioxygenase) inhibitor |
| mgl-3196 | resmetirom: a thyroid hormone receptor-beta agonist | ||
| bms 687453 | |||
| way 252623 | 2-(2-chloro-4-fluorobenzyl)-3-(4-fluorophenyl)-7-(trifluoromethyl)-2H-indazole: a partial LXR agonist | ||
| [5-fluoro-1-(4-isopropylbenzylidene)-2-methylinden-3-yl]acetic acid | [5-fluoro-1-(4-isopropylbenzylidene)-2-methylinden-3-yl]acetic acid : A sulindac-based non-steroidal anti-inflammatory drug. K-80003: sulindac derivative that inhibits activation of phosphoinositide 3-kinase (PI3K) by retinoid X receptor alpha (RXRalpha) in tumor cells | organofluorine compound | non-steroidal anti-inflammatory drug |
| 1-(3,5,5,8,8-pentamethyl-5,6,7,8-tetrahydro-2-naphthyl)-1h-benzotriazole-5-carboxylic acid | 1-(3,5,5,8,8-pentamethyl-5,6,7,8-tetrahydro-2-naphthyl)-1H-benzotriazole-5-carboxylic acid: a partial RXR agonist; structure in first source |