Ampk alpha2 T172 激活指示炼表现和骨肌肉中的能量转导
bioRxiv : the preprint server for biology
|October 3, 2025
概括
AMPKα2 T172的激活对于骨肌肉的能量代谢和运动表现至关重要. 在小鼠中禁用这个部位导致了代谢功能障碍和呼吸障碍,反映了2型糖尿病.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 生理学 生理学 生理学
背景情况:
- 5'-AMP激活蛋白激酶 (AMPK) 作为代谢调节的关键传感器.
- 之前关于AMPK激活的遗传研究由于蛋白质固体测量中断而面临限制.
研究的目的:
- 调查AMPKα2 T172酸化在骨肌肉新陈代谢和功能中的作用,使用一种新的敲入小鼠模型.
- 阐明AMPK对能量转导和运动能力的影响的分子机制.
主要方法:
- 通过CRISPR/Cas9基因编辑,制造出具有非可激活T172A突变的Ampkα敲进 (KI) 小鼠.
- 对KI小鼠的表型分析,包括身体组成,运动能力和骨肌中的线粒体功能.
- 骨肌的综合时间多原子分析 (蛋白质组学,蛋白质组学,代谢组学).
主要成果:
- Ampkα2 T172A KI小鼠表现出脂肪变瘦质量增加,耐力降低,骨肌中的线粒体呼吸受损.
- 多原子分析显示,Ampkα2 T172激活在调节甘油和氧化代谢,线粒体呼吸和肌肉收缩方面发挥着关键作用.
- KI小鼠的骨肌肉蛋白质变化与2型糖尿病患者观察到的变化明显重叠.
结论:
- Ampkα2 T172的激活对于维持骨肌肉能量恒温和运动表现至关重要.
- 这些发现突出了Ampkα2 T172作为2型糖尿病等代谢障碍的潜在治疗点.
相关概念视频
cAMP-dependent Protein Kinase Pathways
8.3K
Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
8.3K
PI3K/mTOR/AKT Signaling Pathway
5.4K
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...
5.4K
Exercise and Muscle Performance
2.3K
Exercise induces a range of adaptations in muscle tissue, depending on the type and duration of activity. Such physical training can be broadly categorized into two types: endurance exercises and resistance exercises.
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...
2.3K
Cell Specific Gene Expression
16.3K
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...
16.3K
mTOR Signaling and Cancer Progression
4.6K
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...
4.6K
Energy Supply for Muscle Contraction
5.5K
Skeletal muscle fibers have the unique ability to switch between rest and contraction states, using different sources of ATP for energy. The contraction cycle and Ca2+ transport back into the sarcoplasmic reticulum for relaxation require significant ATP. However, the ATP reserves in muscle fibers are limited and can only sustain contractions for a few seconds. Additional ATP production becomes necessary for prolonged contractions. As a result, muscle fibers generate ATP through various sources,...
5.5K


