甲状腺激素作用的表观遗传调节在人类代谢功能障碍相关的脂肪肝炎中
Alison-Michelle Naujack1, Christin Krause1, Jan H Britsemmer1
1Institute for Human Genetics, Department of Epigenetics & Metabolism, Center of Brain Behavior & Metabolism, University of Lübeck, Lübeck, Germany.
European thyroid journal
|September 23, 2024
概括
微RNA-34a-5p和DNA甲基化可能会在代谢功能障碍相关的脂肪肝炎 (MASH) 中驱动甲状腺激素抵抗. 肝脏中的这些表观遗传变化可以解释MASH进展和降低甲状腺激素信号.
科学领域:
- 肝病学 肝病学是一种肝病学.
- 内分泌学 在内分泌学.
- 分子生物学分子生物学
背景情况:
- 代谢功能障碍相关的脂肪肝炎 (MASH) 涉及肝脏炎症,纤维化和脂肪积累.
- 在MASH中观察到甲状腺激素 (TH) 信号的减少,包括较低的第I型二氧化酶 (DIO1) 和TH受体β (THRB) 表达.
- 在MASH中肝脏TH作用受损背后的分子机制尚未完全理解.
研究的目的:
- 调查表观遗传机制在MASH进展期间调节肝甲状腺激素作用中的作用.
- 探索微RNA和DNA甲基化在MASH相关的TH抗性中的潜在参与.
主要方法:
- 使用qRT-PCR对MASH患者的肝脏样本的分析和与临床数据的相关性.
- 使用HepG2细胞进行体外研究,通过光酶试验和过度表达来评估miRNA功能.
- 使用双硫酸铁序测序的DNA甲基化分析.
主要成果:
- 在MASH患者中,miR-34a-5p被上调,并且与MASH临床参数正相关.
- miR-34a-5p直接向THRB和DIO1,减少它们的表达以及THRA和SLC10A1在HepG2细胞中的表达,表明已获得的肝TH抗性.
- 在MASH中观察到THRB基因内突1的DNA甲基化增加,与THRB表达负相关.
结论:
- 在MASH中,miR-34a-5p可能充当肝脏TH作用的表观遗传调节剂.
- 在MASH进展过程中,miR-34a-5p上调和THRBDNA甲基化的联合作用可能会导致肝脏TH抵抗.
相关概念视频
Functions of Thyroid Hormones
2.6K
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...
2.6K
Synthesis and Regulation of Thyroid Hormones
4.3K
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...
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...
4.3K
Epigenetic Regulation
30.9K
Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
30.9K
Cell Specific Gene Expression
13.5K
Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
13.5K
Regulation of Metabolism
9.3K
Cellular needs and conditions vary from cell to cell and change within individual cells over time. For example, the required enzymes and energetic demands of stomach cells are different from those of fat storage cells, skin cells, blood cells, and nerve cells. Furthermore, a digestive cell works much harder to process and break down nutrients during the time that closely follows a meal compared with many hours after a meal. As these cellular demands and conditions vary, so do the amounts and...
9.3K
Regulation of Hormone Secretion
3.3K
Regulation of hormone secretion is a finely tuned orchestration driven by various types of stimuli, encompassing neural, humoral, and hormonal signals. Environmental cues instigate neural stimuli, where action potentials traverse nerve fibers to reach their designated targets. An illustrative scenario is the body's response to stress, wherein the sympathetic nervous system releases epinephrine from the adrenal glands, inducing the well-known 'fight or flight' reaction.
Humoral...
Humoral...
3.3K


