相关实验视频
Updated: Jul 13, 2026

09:31
Heterokaryon Technique for Analysis of Cell Type-specific Localization
Published on: March 11, 2011
概括
甲状腺激素受体不仅仅存在于核中,挑战了以前的模型. 需要进一步的研究来了解核外甲状腺激素结合的生理作用.
科学领域:
- 内分泌学 在内分泌学.
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 甲状腺激素在新陈代谢和发育中起着至关重要的作用.
- 核受体一直是理解甲状腺激素作用的主要焦点.
- 已经报告了甲状腺激素的核外结合点,但它们的意义仍在争论中.
研究的目的:
- 批判性地评估当前用于研究甲状腺激素结合的体外方法的生理相关性.
- 根据结合部位分布,重新评估甲状腺激素受体和类固醇激素受体之间的类比.
主要方法:
- 研究了甲状腺激素高亲和度,和性结合点的存在和特征.
- 在孤立的核和主要的核外细胞组件中检查了结合部位.
- 评估了细胞醇促进甲状腺激素核结合的能力.
主要成果:
- 确定了甲状腺激素在主要核外细胞组件中的"高亲和度和度"结合点,而不仅仅是孤立的细胞核.
- 在不同细胞位置观察到这些结合点的相似特征.
- 证明细胞醇不会促进甲状腺激素的核结合.
结论:
- 甲状腺激素结合点的广泛分布挑战了独家的核定位模型.
- 与主要通过核受体起作用的类固醇激素受体的类比无效.
- 需要对甲状腺激素的体外核结合试验的生理相关性进行批判性重新评估.
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相关概念视频
Intracellular Hormone Receptors
Lipid-soluble hormones diffuse across the plasma and nuclear membrane of target cells to bind to their specific intracellular receptors. These receptors act as transcription factors that regulate gene expression and protein synthesis in the target cell
Internal Receptors
Many cellular signals are hydrophilic and therefore cannot pass through the plasma membrane. However, small or hydrophobic signaling molecules can cross the hydrophobic core of the plasma membrane and bind to internal, or intracellular, receptors that reside within the cell. Many mammalian steroid hormones use this mechanism of cell signaling, as does nitric oxide (NO) gas.
Types of Receptors: Internal Receptors
Many cellular signals are hydrophilic and cannot pass through the plasma membrane. However, small or hydrophobic signaling molecules can cross the hydrophobic core of the plasma membrane and bind intracellular receptors that reside within the cell cytoplasm or nucleus. Many mammalian steroid hormones and nitric oxide (NO) gas use this cell signaling mechanism.
Similar to membrane-bound receptors, the binding of a ligand to the intracellular receptor of causes a conformational change in the...
Similar to membrane-bound receptors, the binding of a ligand to the intracellular receptor of causes a conformational change in the...
Transducer Mechanism: Nuclear Receptors
Nuclear receptors, or NRs, are unique transcription factors that regulate gene transcription and affect the cellular pathways involved in reproduction, development, or metabolism. Their ability to be stimulated by small lipophilic ligands and control vital cellular processes makes them ideal drug targets. Nearly 10-15% of currently prescribed drugs target these receptors.
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:
Synthesis and Regulation of Thyroid Hormones
Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
Upon reaching the thyroid gland, TSH stimulates the follicular cells' active uptake of iodide ions from the blood. The ions diffuse to the apical surface of the cells and are oxidized to iodine. The iodine is then...
Upon reaching the thyroid gland, TSH stimulates the follicular cells' active uptake of iodide ions from the blood. The ions diffuse to the apical surface of the cells and are oxidized to iodine. The iodine is then...
Functions of Thyroid Hormones
The thyroid hormone (TH) plays a pivotal role in the intricate orchestration of physiological processes, exerting profound effects on development, metabolism, and homeostasis throughout different life stages.
TH is indispensable for the normal development and maturation of the skeletal, muscular, and nervous systems during fetal and childhood growth. It facilitates bone mineral turnover and regulates protein synthesis in developing tissues, contributing significantly to overall growth and...
TH is indispensable for the normal development and maturation of the skeletal, muscular, and nervous systems during fetal and childhood growth. It facilitates bone mineral turnover and regulates protein synthesis in developing tissues, contributing significantly to overall growth and...