在缺乏神经素受体的骨肌肉中形成突触
P Escher1, E Lacazette, M Courtet
1Institute of Physiology, Biozentrum, University of Basel, 4056 Basel, Switzerland.
概括
神经肌肉结 (NMJ) 的形成发生在没有神经调节素 (NRG) 向肌肉发出信号的情况下. 仅阿格林就会诱导 postsynaptic 的分化,这表明 NRG 是 NRG.
科学领域:
- 神经科学是一个神经科学.
- 发展生物学 发展生物学
- 细胞生物学 细胞生物学
背景情况:
- 神经肌肉结 (NMJ) 的形成涉及运动神经元和肌肉纤维之间的复杂信号传输.
- 神经调节素 (NRG) 和Agrin是关键的信号分子,与NMJ发育有关.
- 在NMJ形成中NRG和Agrin的确切作用需要进一步阐明.
研究的目的:
- 调查神经调节蛋白 (NRG) 向肌肉发送信号的必要性,以形成神经肌肉结 (NMJ).
- 确定NRG受体ErbB2和ErbB4在NMJ发育中的特定作用.
- 为了澄清在没有NRG信号的情况下Agrin的贡献.
主要方法:
- 使用了缺乏NRG受体ErbB2和ErbB4在肌肉中的小鼠模型.
- 在这些转基因小鼠中检查了NMJ形成和 postsynaptic分化.
- 评估了独立于NRG通路的Agrin信号的影响.
主要成果:
- 神经肌肉结 (NMJ) 在缺乏肌肉NRG受体ErbB2和ErbB4.4的小鼠中成功形成.
- 在NMJ的后突触分化是由Agrin诱导的,即使没有NRG信号.
- 直接向肌肉发送NRG信号对于NMJ形成并不重要.
结论:
- 神经调节蛋白 (NRG) 向肌肉传递信号对于神经肌肉结 (NMJ) 的形成是不可或缺的.
- 阿格林是一个足够的诱导者在NMJ的 postsynaptic分化.
- NRG对NMJ形成的影响可能是间接的,可能涉及斯万细胞.
相关概念视频
Somatosensation
The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
Chemical Synapses
Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Blood and Nerve Supply to the Bones
Bones are dynamic organs that require a rich supply of oxygen and nutrients. Around 5% to 10% of the cardiac output supplies blood to the bones. A typical long bone has three main sources: the nutrient artery, the metaphyseal and epiphyseal arteries, and the periosteal arteries.
Nutrient Artery
The nutrient artery is the main blood vessel that enters the diaphysis via the nutrient foramen. While most long bones have only one nutrient foramen, large bones, such as the femur, may have two. This...
Nutrient Artery
The nutrient artery is the main blood vessel that enters the diaphysis via the nutrient foramen. While most long bones have only one nutrient foramen, large bones, such as the femur, may have two. This...
The Neuromuscular Junction
The nervous system consists of complex motor neuron circuits, including upper motor neurons originating from the cerebral cortex and lower motor neurons starting in the spinal cord, coordinating both voluntary and involuntary movements. Among these, somatic motor neurons activate skeletal muscles and are classified into alpha, beta, and gamma types. Alpha neurons are vital for voluntary movement coordination, while gamma neurons adjust muscle spindle sensitivity, and the function of beta...
Chemical Synapses
Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Somatic Spinal Reflexes
Somatic spinal reflexes are rapid, involuntary muscular responses to external stimuli that involve the somatic musculature and the spinal cord.
One of the most well-known somatic spinal reflexes is the stretch reflex, which is activated by the sudden stretching of a muscle. This reflex involves the activation of specialized sensory receptors called muscle spindles, which are located in the muscle tissue and detect changes in the length and speed of muscle contractions. When a muscle is suddenly...
One of the most well-known somatic spinal reflexes is the stretch reflex, which is activated by the sudden stretching of a muscle. This reflex involves the activation of specialized sensory receptors called muscle spindles, which are located in the muscle tissue and detect changes in the length and speed of muscle contractions. When a muscle is suddenly...


