相关实验视频
Updated: Jul 7, 2025

09:51
Cochlear Surface Preparation in the Adult Mouse
Published on: November 6, 2019
16.0K
异常的胆固醇代谢和溶酶体功能障碍通过抑制mTORC1-TFEB-依赖自会诱导与年龄相关的听力损失
Yun Yeong Lee1, Jungho Ha1,2, Young Sun Kim1
1Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea.
International journal of molecular sciences
|December 23, 2023
概括
高胆固醇导致与年龄相关的听力损失,因为它会损害耳朵中的细胞清洁过程. 使用阿托瓦斯塔丁降低胆固醇可以通过恢复细胞功能来预防听力下降.
科学领域:
- 耳鼻喉科 耳鼻喉科 耳鼻喉科
- 老年学是指老年学的学科.
- 分子生物学分子生物学
背景情况:
- 胆固醇是与年龄相关的听力损失 (ARHL) 的已知危险因素.
- 在ARHL发作期间,胆固醇对Corti器官的具体影响仍然不清楚.
- 了解这种机制对于制定预防策略至关重要.
研究的目的:
- 调查胆固醇在与年龄相关的听力损失病变中的作用.
- 阐明将胆固醇与ARHL联系起来的分子机制.
- 评估降胆固醇药物在预防ARHL方面的治疗潜力.
主要方法:
- 建立了一个小鼠模型,比较老年 (24个月) 和年轻 (6个月) 的小鼠.
- 使用听觉脑干反应 (ABR) 评估听觉功能.
- 进行了组织学分析 (TEM,H&E,SBB,菲律宾),生化分析 (IHC,酶,免疫) 和RNA测序.
- 使用HEI-OC1细胞进行了体外研究.
主要成果:
- RNA测序揭示了与代谢疾病,胆固醇平衡和老年小鼠mTORC1信号相关的基因的表达增加.
- 在ARHL组织中,胆固醇和脂素水平升高,自流抑制,TFEB降低,mTORC1活性增加.
- 在老年小鼠中,阿托瓦斯塔丁治疗延迟了听力损失,降低了胆固醇,并恢复了 lysosomal 功能和自.
结论:
- 胆固醇的积累在与年龄相关的听力损失的发病过程中起着重要作用.
- 胆固醇通过TFEB和mTORC1通路破坏溶解体功能和自.
- 阿托瓦斯塔丁通过调节这些途径,显示出预防ARHL的潜力.
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
Autophagy
4.2K
Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
4.2K
Lysosomal Hydrolases
3.8K
Lysosomes are the site for the degradation of macromolecules and biological polymers released during membrane trafficking events such as secretory, endocytic, autophagic, and phagocytic pathways. The membrane-enclosed area of the lysosome, called the lumen, contains hydrolytic enzymes active in an acidic environment. These acid hydrolases are functional at a pH between 4.5 and 5 and are involved in cellular processes such as cell signaling, energy metabolism, restoration of the plasma membrane,...
3.8K
PI3K/mTOR/AKT Signaling Pathway
3.6K
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...
3.6K
Delivery Pathways to the Lysosome
6.6K
Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
Endocytosis
In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...
Endocytosis
In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...
6.6K
Mitochondria
13.0K
Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
13.0K

