| 영문 | thyroid hormone | 한글 | 갑상샘호르몬 |
|---|---|---|---|
| 설명 | 광의의 갑상선호르몬은 티록신(thyroxine(T4)), 삼요드티로닌(triiodothyronine (T3)), 티로칼시토닌(thyrocalcitonin)의 3가지중 하나를 말하나 대개의 경우 협의의 뜻으로 사용되며 이 경우 티록신과 삼요드티로닌을 지칭한다. 갑상선 호르몬은 거의 모든 몸세포에서의 바탕질대사에 관여하여 에너지생성을 증가시키고 성장 발육을 촉진한다. 이것은 뇌하수체에서 분비되는 갑상샘 자극호르몬에 의해 합성 및 분비가 촉진된다. 섭취하여 체내에 들어온 요오드가 능동운반에 의해 갑상샘세포내로 들어가 세포내에 있는 단백질인 갑상샘 글로블린과 결합하여 갑상샘호르몬으로 합성된다. 요오드가 3분자 결합한 것을 T3, 4분자 결합한 것을 T4라 부름. 분비되는 갑상선 호르몬중 90%이상이 T4이다. 혈중으로 분비된 갑상샘호르몬은 혈중 단백질과 결합하는데 대부분은 티론신결합글로블린과 결합하며 일부는 알부민과 결합한다. 전반적인 대사율을 촉진시키며 어린이에서는 성장을 촉진시킨다. 특히 어린이에서 몰단백질 합성을 촉진하며 뇌의 발달에 중요한 기능을 함으로써, 선천성 갑상샘저하증(cretinism)을 조기 발견하여 치료하지 못하면 정신지체가 유발된다. 갑상샘과다증의 증상은 체내 대사가 항진되어 식욕이 증가하나 체중이 감소하고 심장박동수가 증가하고 더위를 참지 못하며, 갑상샘기능저하증의 증상은 위와 반대로 식욕이 감소하고 체중이 증가하며 심장박동수가 감소하고 추위를 참지 못하며 피부에 단백질이 축적되어 점액부종이 유발된다. |
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| 131I | radioactive Iodine(used in Thyroid uptake, Liver & Kidney Scans & Treatment of malignant & nonmalig... |
|---|---|
| MEN | Multiple Endocrine Neoplasia ; AD Trait 1. MEN Type I(= Wermer Syndro... |
| HTS | head traumatic syndrome; HeLa tumor suppression; human thyroid-stimulating hormone, human thyroid st... |
| ER | efficiency ratio; epigastric region; ejection rate; electroresection; emergency room; endoplasmic re... |
| RAR | rapidly adapting receptor; rat insulin receptor; retinoic acid receptor; right arm reclining; right ... |
| gene rearrangement, beta-chain T-cell antigen receptor | Ordered rearrangement of T-cell variable gene regions coding for the beta-chain of antigen receptors. (12 Dec 1998) |
|---|---|
| gene rearrangement, delta-chain T-cell antigen receptor | Ordered rearrangement of T-cell variable gene regions coding for the delta-chain of antigen receptors. (12 Dec 1998) |
| gene rearrangement, gamma-chain T-cell antigen receptor | Ordered rearrangement of T-cell variable gene regions coding for the gamma-chain of antigen receptors. (12 Dec 1998) |
| genes, T-cell receptor | DNA sequences, in cells of the t-lymphocyte lineage, that code for T-cell receptors. The tcr genes are formed by somatic rearrangement (see gene rearrangement, t-lymphocyte and its children) of germline gene segments, and resemble ig genes in their mechanisms of diversity generation and expression. (12 Dec 1998) |
| genes, T-cell receptor alpha | DNA sequences encoding the alpha chain of the T-cell receptor. The genomic organization of the tcr alpha genes is essentially the same in all species and is similar to the organization of ig genes. (12 Dec 1998) |
| genes, T-cell receptor beta | DNA sequences encoding the beta chain of the T-cell receptor. The genomic organization of the tcr beta genes is essentially the same in all species and is similar to the organization of ig genes. (12 Dec 1998) |
| genes, T-cell receptor delta | DNA sequences encoding the delta chain of the T-cell receptor. The delta-chain locus is located entirely within the alpha-chain locus. (12 Dec 1998) |
| genes, T-cell receptor gamma | DNA sequences encoding the gamma chain of the T-cell receptor. The human gamma-chain locus is organised similarly to the tcr beta-chain locus. (12 Dec 1998) |
| receptor | 1. A molecular structure within a cell or on the surface characterised by selective binding of a specific substance and a specific physiologic effect that accompanies the binding, for example, cell surface receptors for peptide hormones, neurotransmitters, antigens, complement fragments and immunoglobulins and cytoplasmic receptors for steroid hormones. 2. A sensory nerve terminal that responds to stimuli of various kinds. (18 Nov 1997) |
| receptor aggregation | Chemically stimulated aggregation of cell surface receptors, which potentiates the action of the effector cell. (12 Dec 1998) |
| receptor agonist | A substance that mimics a specificneurotransmitter, is able to attach to that neurotransmitter's receptor and thereby produces the same action that theneurotransmitter usually produces. Drugs are often designed as receptor agonists to treat a variety of diseases and disorders whenthe original chemical substance is missing or depleted. (22 May 1997) |
| receptor-CD3 complex, antigen, T-cell | Molecule composed of the non-covalent association of the T-cell antigen receptor (receptors, antigen, T-cell) with the CD3 complex (antigens, CD3). This association is required for the surface expression and function of both components. The molecule consists of up to seven chains: either the alpha/beta or gamma/delta chains of the T-cell receptor, and four or five chains in the CD3 complex. (12 Dec 1998) |
| receptor, chemokine | A molecule that receives a chemokine and acts as a dock for a chemokine. Several chemokine receptors are essential co-receptors for HIV. (12 Dec 1998) |
| receptor downregulation | A phenomenon observed in many cells: following stimulation with a ligand the number of receptors for that ligand on the cell surface diminishes because internalisation exceeds replenishment. Often used very loosely, thus destroying the utility of the term. (18 Nov 1997) |
| receptor mediated endocytosis | Endocytosis of molecules by means of a specific receptor protein that normally resides in a coated pit, but may enter this structure after complex formation occurs. The structure then forms a coated vesicle that delivers its contents to the endosome whence it may enter the cytoplasm or the lysosomal compartment. Many bacterial toxins and viruses enter cells by this route. (18 Nov 1997) |