低MBOAT7表达,MASH的遗传风险,促进了一种涉及肝细胞TAZ上调的益菌性通路
Mary P Moore1, Xiaobo Wang1, John Paul Kennelly2
1Department of Medicine, Columbia University Irving Medical Center, New York, New York, USA.
Hepatology (Baltimore, Md.)
|May 22, 2024
概括
在代谢功能障碍相关的脂肪肝炎 (MASH) 中恢复MBOAT7表达减缓了肝纤维化进展. MBOAT7功能的丧失通过通过改变的脂物通过TAZ和印度刺 (IHH) 的上调来加剧MASH纤维化.
科学领域:
- 肝病学 肝病学是一种肝病学.
- 遗传学 遗传学是一种遗传学.
- 分子生物学分子生物学
背景情况:
- 与代谢功能障碍相关的脂肪性肝病 (MASLD) 和MASH是严重的健康问题.
- 遗传变异rs641738 C>T与MASH和肝纤维化有关.
- 这种变异与MBOAT7酶的减少表达有关,MBOAT7酶对于脂重塑至关重要.
研究的目的:
- 调查恢复MBOAT7表达是否可以阻止MASH相关的肝纤维化进展.
- 阐明减少MBOAT7表达恶化MASH纤维化的机制.
主要方法:
- 使用了饮食诱导的脂肪肝炎的小鼠模型.
- 操纵肝细胞MBOAT7表达 (恢复和沉默).
- 分析了涉及TAZ,印度刺 (IHH) 和肝细胞脂的分子途径.
主要成果:
- 在MASH小鼠中,肝细胞MBOAT7的恢复减少了肝纤维化进展.
- MBOAT7可以抑制恶化的肝纤维化,但不能抑制胆固醇.
- MBOAT7功能丧失改变了肝细胞脂,促进了一条调节TAZ和IHH的途径.
- 具有风险等位基因的人类MASH肝脏显示TAZ活性和IHH mRNA增加.
结论:
- 发现了一种新的机制,将MBOAT7功能丧失与MASH纤维化联系起来.
- 提供了对rs641738基因位点在MASH中的作用的新见解.
- 建议针对肝细胞TAZ进行个性化MASH纤维化治疗,用于高危人群.
相关概念视频
mTOR Signaling and Cancer Progression
3.8K
The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
The mTOR pathway or the...
3.8K
Abnormal Proliferation
4.5K
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
4.5K
PI3K/mTOR/AKT Signaling Pathway
3.5K
The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a...
3.5K
Regulation of Angiogenesis and Blood Supply
2.6K
Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits. Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl...
2.6K
TGF - β Signaling Pathway
7.3K
The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors...
7.3K
Cell Specific Gene Expression
13.6K
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...
13.6K


