相关实验视频
Updated: Feb 7, 2026

09:45
Mitochondrial Isolation from Skeletal Muscle
Published on: March 30, 2011
29.6K
维生素B12改善了老年小鼠的骨肌肉线粒体生物学
bioRxiv : the preprint server for biology
|February 6, 2026
概括
维生素B12补充改善了老年雌性小鼠的骨肌肉线粒体含量和形态. 这种干预也减少了氧化应激,表明了与年龄相关的肌肉衰退的潜力.
科学领域:
- 老年学是一门学科.
- 线粒体生物学 线粒体生物学
- 骨肌肉生理学 骨肌肉生理学
背景情况:
- 与年龄相关的骨肌肉恶化与线粒体功能障碍有关.
- 目前用于逆转线粒体衰退的治疗方法有限.
- 维生素B12对骨肌肉线粒体在衰老中的作用尚未研究.
研究的目的:
- 为了研究维生素B12补充对老年雌性小鼠骨肌肉线粒体生物学的影响.
- 检查维生素B12对线粒体含量,形态,功能和相关途径的影响.
- 评估维生素B12在减轻肌肉细胞中氧化压力的作用.
主要方法:
- 年龄较大的雌性小鼠接受了12周的维生素B12补充剂或车辆控制.
- 在小鼠骨肌中评估了线粒体DNA,内容,形态和功能.
- 蛋白质组分析确定了差异表达的蛋白质和丰富的途径.
- 人类初级神经管被用来测量活性氧物种 (ROS) 和谷氨酸水平.
主要成果:
- 在老年小鼠中,维生素B12补充增加了线粒体含量和改善了线粒体形态.
- 蛋白质组分析显示TCA循环中的丰富,氧化酸化 (OXPHOS) 和氧化应激途径.
- 在人体肌管中,维生素B12补充剂降低了ROS水平.
结论:
- 维生素B12补充剂对老年雌性小鼠的骨肌肉线粒体生物学有积极的影响.
- 这些发现表明,维生素B12可能是一种潜在的治疗策略,可以抵消与年龄相关的线粒体功能障碍.
- 这是第一次研究维生素B12对老年雌性小鼠骨肌肉线粒体的影响.
相关概念视频
Classification of Skeletal Muscle Fibers
59.5K
Skeletal muscles continuously produce ATP to provide the energy that enables muscle contractions. Skeletal muscle fibers can be categorized into three types based on differences in their contraction speed and how they produce ATP, as well as physical differences related to these factors. Most human muscles contain all three muscle fiber types, albeit in varying proportions.
Slow-Twitch Muscle Fibers
Slow oxidative, muscle fibers appear red due to large numbers of capillaries and high levels of...
Slow-Twitch Muscle Fibers
Slow oxidative, muscle fibers appear red due to large numbers of capillaries and high levels of...
59.5K
Overview of Skeletal Muscle
14.7K
Skeletal muscles are composed of a bundle of muscle fibers and are attached to bones through tendons. Each skeletal muscle fiber is a single muscle cell. The sarcolemma, the plasma membrane of a skeletal muscle cell, consists of a lipid bilayer and glycocalyx that supports muscle fibers. The sarcolemma extends into the muscle cells to form tubular structures called transverse or T-tubules. Each side of the T-tubules consists of a membrane-bound structure called the sarcoplasmic reticulum,...
14.7K
Relaxation of Skeletal Muscles
5.9K
The period of muscle contraction primarily influences the duration of stimulation at the neuromuscular junction (NMJ), the presence of free calcium ions in the sarcoplasm, and the availability of energy or ATP to support contractions.
When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated sodium channels. Sodium ions enter the cell, further depolarizing the presynaptic membrane. This depolarization causes voltage-gated calcium channels to open....
When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated sodium channels. Sodium ions enter the cell, further depolarizing the presynaptic membrane. This depolarization causes voltage-gated calcium channels to open....
5.9K
Disorders of the Skeletal Muscle
1.9K
The clinical conditions affecting the skeletal muscle tissue are broadly categorized as musculoskeletal and neuromuscular disorders.
Musculoskeletal disorders
Musculoskeletal disorders involve injuries and conditions affecting the skeletal muscles and associated connective tissues. These disorders can arise from acute biomechanical stresses or chronic overuse and can occur across different age groups. Common injuries include sprains, fractures, and muscular strains, often resulting from...
Musculoskeletal disorders
Musculoskeletal disorders involve injuries and conditions affecting the skeletal muscles and associated connective tissues. These disorders can arise from acute biomechanical stresses or chronic overuse and can occur across different age groups. Common injuries include sprains, fractures, and muscular strains, often resulting from...
1.9K
Naming Skeletal Muscles
4.1K
The naming of the approximately 700 muscles in the human body is based on a set of criteria designed to provide descriptive information about each muscle, making it easier to identify and remember them.
The key factors used in naming muscles include:
The key factors used in naming muscles include:
4.1K
Skeletal Muscle Anatomy
92.8K
Skeletal muscle is the most abundant type of muscle in the body. Tendons are the connective tissue that attaches skeletal muscle to bones. Skeletal muscles pull on tendons, which in turn pull on bones to carry out voluntary movements.
92.8K

