Target type: biologicalprocess
Any process that modulates the frequency, rate or extent of a thyroid hormone mediated signaling pathway. [GOC:hjd]
The regulation of thyroid hormone mediated signaling pathway is a complex process involving multiple steps and interactions. It begins with the synthesis and release of thyroid hormones, primarily thyroxine (T4) and triiodothyronine (T3), from the thyroid gland. These hormones are transported in the blood bound to carrier proteins, such as thyroxine-binding globulin (TBG). Once in the bloodstream, T4 is converted to T3, the active form of the hormone, by deiodinases. T3 then enters cells and binds to thyroid hormone receptors (TRs), which are nuclear transcription factors. TRs can bind to DNA as monomers or dimers, and their binding to specific DNA sequences, known as thyroid hormone response elements (TREs), can either activate or repress gene expression.
The activity of the thyroid hormone pathway is tightly regulated at multiple levels. One important regulatory mechanism is the negative feedback loop involving the hypothalamus-pituitary-thyroid (HPT) axis. The hypothalamus secretes thyrotropin-releasing hormone (TRH), which stimulates the pituitary gland to release thyroid-stimulating hormone (TSH). TSH then acts on the thyroid gland to stimulate the synthesis and release of T4 and T3. As T3 levels rise, they feedback to inhibit the release of TRH and TSH, thereby reducing the production of thyroid hormones.
Other factors that can influence the thyroid hormone pathway include:
- **Dietary iodine:** Iodine is essential for the synthesis of thyroid hormones.
- **Stress:** Stress can suppress thyroid hormone production.
- **Medications:** Certain medications, such as lithium and amiodarone, can interfere with thyroid hormone synthesis or metabolism.
- **Autoimmune disorders:** Autoimmune disorders, such as Hashimoto's thyroiditis and Graves' disease, can affect the thyroid gland and alter thyroid hormone production.
- **Genetic factors:** Genetic factors can contribute to individual variations in thyroid hormone levels and response.
The regulation of thyroid hormone signaling is critical for maintaining normal metabolic processes, including:
- **Growth and development:** Thyroid hormones are essential for normal growth and development, particularly in the brain and nervous system.
- **Metabolism:** Thyroid hormones regulate basal metabolic rate, body temperature, and carbohydrate, protein, and lipid metabolism.
- **Cardiovascular function:** Thyroid hormones influence heart rate, contractility, and blood pressure.
- **Nervous system function:** Thyroid hormones play a role in brain development, cognitive function, and mood regulation.
Disruptions in thyroid hormone signaling can lead to various health problems, including hypothyroidism and hyperthyroidism. Hypothyroidism is characterized by low levels of thyroid hormone, which can result in fatigue, weight gain, and slowed metabolism. Hyperthyroidism is characterized by excessive thyroid hormone production, which can cause rapid heartbeat, weight loss, and anxiety.
Understanding the intricate regulation of thyroid hormone signaling is crucial for diagnosing and treating thyroid disorders and for developing novel therapies for related conditions.
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| Protein | Definition | Taxonomy |
|---|---|---|
| Lysosomal Pro-X carboxypeptidase | A lysosomal Pro-X carboxypeptidase that is encoded in the genome of human. [PRO:DNx, UniProtKB:P42785] | Homo sapiens (human) |
| Thyroid hormone receptor alpha | A thyroid hormone receptor alpha that is encoded in the genome of human. [PRO:HJD, UniProtKB:P10827] | 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 |
| 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 |
| phencyclidine | phencyclidine : A member of the class of piperidines that is piperidine in which the nitrogen is substituted with a 1-phenylcyclohexyl group. Formerly used as an anaesthetic agent, it exhibits both hallucinogenic and neurotoxic effects. Phencyclidine: A hallucinogen formerly used as a veterinary anesthetic, and briefly as a general anesthetic for humans. Phencyclidine is similar to KETAMINE in structure and in many of its effects. Like ketamine, it can produce a dissociative state. It exerts its pharmacological action through inhibition of NMDA receptors (RECEPTORS, N-METHYL-D-ASPARTATE). As a drug of abuse, it is known as PCP and Angel Dust. | benzenes; piperidines | anaesthetic; neurotoxin; NMDA receptor antagonist; psychotropic drug |
| 2-methyl-1,2,3,4-tetrahydroisoquinoline | |||
| 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 |
| tenocyclidine | tenocyclidine : A tertiary amino compound that consists of cyclohexane having piperidin-1-yl and thiophen-2-yl groups attached at position 1. A dissociative anaesthetic drug with halluccinogenic and stimulant effects. Its effects are similar to those of phencyclidine (PCP, an analogue with the thienyl group replaced by phenyl), but it is rather more potent. | piperidines; tertiary amino compound; thiophenes | central nervous system stimulant; hallucinogen; neuroprotective agent; NMDA receptor antagonist |
| 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 |
| 1,2,3,4-tetrahydro-1-(phenylmethyl)isoquinoline | 1,2,3,4-tetrahydro-1-(phenylmethyl)isoquinoline: structure given in first source | benzyltetrahydroisoquinoline | |
| 1,2,3,4-tetrahydro-1-phenylisoquinoline | 1,2,3,4-tetrahydro-1-phenylisoquinoline: structure in first source | ||
| 3,5-dimethyl-3'-isopropyl-l-thyronine | 3,5-dimethyl-3'-isopropyl-L-thyronine: RN given refers to (L)-isomer | ||
| metaphit | metaphit: site-directed acylating agent of phencyclidine receptors in rat brain; structure given in first source | ||
| 1-(1-(2-benzo(b)thienyl)cyclohexyl)piperidine | 1-(1-(2-benzo(b)thienyl)cyclohexyl)piperidine: structure given in first source 1-[1-(1-benzothiophen-2-yl)cyclohexyl]piperidine : A tertiary amino compound that consists of cyclohexane having piperidin-1-yl and benzothiophen-2-yl groups attached at position 1. A potent dopamine re-uptake inhibitor with a behavioral profile different from that of phencyclidine (PCP) and similar to that of cocaine. | 1-benzothiophenes; piperidines; tertiary amino compound | dopamine uptake inhibitor |
| jtp 4819 | JTP 4819: a prolyl endopeptidase inhibitor; structure given in first source | ||
| dizocilpine | secondary amino compound; tetracyclic antidepressant | anaesthetic; anticonvulsant; neuroprotective agent; nicotinic antagonist; NMDA receptor antagonist | |
| cocaine | cocaine : A tropane alkaloid obtained from leaves of the South American shrub Erythroxylon coca. Cocaine: An alkaloid ester extracted from the leaves of plants including coca. It is a local anesthetic and vasoconstrictor and is clinically used for that purpose, particularly in the eye, ear, nose, and throat. It also has powerful central nervous system effects similar to the amphetamines and is a drug of abuse. Cocaine, like amphetamines, acts by multiple mechanisms on brain catecholaminergic neurons; the mechanism of its reinforcing effects is thought to involve inhibition of dopamine uptake. | benzoate ester; methyl ester; tertiary amino compound; tropane alkaloid | adrenergic uptake inhibitor; central nervous system stimulant; dopamine uptake inhibitor; environmental contaminant; local anaesthetic; mouse metabolite; plant metabolite; serotonin uptake inhibitor; sodium channel blocker; sympathomimetic agent; vasoconstrictor agent; xenobiotic |
| 4-phenyl-1,2,3,4-tetrahydroisoquinoline | 4-phenyl-1,2,3,4-tetrahydroisoquinoline: RN given is for (R)-isomer; inhibits spinal reflex-enhancing effects of methamphetamine, phenylethylamine, and nomifensine | isoquinolines | |
| 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 |
| gc 1 compound | GC 1 compound: structure in first source | diarylmethane | |
| 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 | ||
| 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 | ||
| 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 |