Visualizing the Morphological Characteristics of Neuromuscular Junction in Rat Medial Gastrocnemius Muscle

Jingjing Cui; Shuang Wu; Jia Wang; Yuqing Wang; Yuxin Su; Dongsheng Xu; Yihan Liu; Junhong Gao; Xianghong Jing; Wanzhu Bai

doi:10.3791/63954

Visualización de las características morfológicas de la unión neuromuscular en el músculo gastroc...

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JoVE Journal Neuroscience

Visualizing the Morphological Characteristics of Neuromuscular Junction in Rat Medial Gastrocnemius Muscle

Visualización de las características morfológicas de la unión neuromuscular en el músculo gastrocnemio medial de rata

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08:42 min

May 17, 2022

DOI: 10.3791/63954-v

Jingjing Cui*¹, Shuang Wu*¹, Jia Wang¹, Yuqing Wang¹, Yuxin Su¹, Dongsheng Xu¹, Yihan Liu¹, Junhong Gao¹, Xianghong Jing¹, Wanzhu Bai¹

¹Institute of Acupuncture and Moxibustion,China Academy of Chinese Medical Sciences

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Overview

This study presents a protocol for examining the spatial correlation between pre-synaptic terminals, post-synaptic receptors, and peri-synaptic Schwann cells in the rat medial gastrocnemius muscle. Utilizing fluorescent immunohistochemistry with specific biomarkers, it evaluates integrity and plasticity of neuromuscular junctions under both normal and pathological conditions.

Key Study Components

Area of Science

Neuroscience
Cell Biology
Neuroanatomy

Background

Neuromuscular junction integrity is critical for muscle function.
Understanding the interactions between nerve fibers and Schwann cells can provide insights into nerve repair mechanisms.
Fluorescent immunohistochemistry allows for detailed imaging of cellular interactions.
Pathological conditions can alter neuromuscular junction properties.

Purpose of Study

To develop a reliable method for observing neuromuscular junction morphology.
To investigate spatial correlations among various neuromuscular junction components.
To assess changes under normal and diseased states.

Methods Used

Fluorescent immunohistochemistry on rat medial gastrocnemius muscle sections.
Adult male rats were euthanized; muscles were perfused and fixed for imaging.
Sections were treated with primary and secondary antibodies for specific labeling.
Imaging involved confocal microscopy to capture multi-layered spatial data.

Main Results

The method successfully revealed the relationships among nerve fibers, Schwann cells, and receptors.
Detailed morphological characteristics of neuromuscular junctions were outlined.
The spatial pattern showed distinct clustering of cellular components indicating functional relevance.
Data supports the analysis of neuromuscular junctions under different physiological conditions.

Conclusions

This protocol offers valuable insights into neuromuscular junction organization.
Findings have implications for studying neuronal mechanisms and potential recovery from injuries.
Understanding these interactions enhances knowledge of neuromuscular pathologies.

Frequently Asked Questions

What are the advantages of this immunohistochemistry method?

This method allows for detailed imaging of specific cellular components and their spatial relationships, facilitating a better understanding of the neuromuscular junction.

How is the biological model implemented in this study?

Adult male rats are used, and after euthanization, their medial gastrocnemius muscles are dissected and processed for imaging.

What types of data or outcomes are obtained from this protocol?

The protocol yields detailed images of neuromuscular junction structures, including the localization of nerve fibers, receptors, and Schwann cells.

How can this method be applied or adapted for future studies?

This technique can be adapted to study various neuromuscular pathologies or treatments by modifying the biomarkers used for labeling specific components.

What key limitations should be considered when using this method?

One limitation includes the requirement for specialized imaging equipment, such as confocal microscopy, which may not be available in all laboratories.

What are the critical steps in the protocol?

Key steps include precise perfusion of the muscle tissue, proper fixation, and careful slicing to maintain tissue integrity for imaging.

What implications does this study have for understanding neuromuscular junctions?

This study provides insights into the structural organization of neuromuscular junctions, which is essential for understanding muscle function and regeneration post-injury.

El protocolo muestra un método para examinar la correlación espacial entre los terminales presinápticos, los receptores postsinápticos y las células de Schwann perisinápticas en el músculo gastrocnemio medial de la rata utilizando inmunohistoquímica fluorescente con diferentes biomarcadores, a saber, neurofilamento 200, transportador vesicular de acetilcolina, alfa-bungarotoxina y S100.

Este protocolo se puede utilizar para evaluar la integridad y plasticidad de una unión neuromuscular en condiciones normales y patológicas. Esta técnica consiste en etiquetar simultáneamente las células de Schwann y los animales de laboratorio pre y post en secciones musculares individuales. Después de sacrificar a la rata macho adulta, coloque la rata en la capucha y abra la cavidad torácica para acceder al corazón con tijeras y fórceps.

Inserte un catéter intravenoso desde el ventrículo cardíaco izquierdo hacia la aorta y corte el oráculo derecho. A continuación, comience la perfusión con 100 mililitros de solución salina normal al 0,9% hasta que la sangre que sale del oráculo derecho esté clara. Luego continúe perfundiendo con 250 a 300 mililitros de paraformaldehído al 4% en tampón de fosfato molar 0.1 o pH PB 7.4 durante 10 minutos.

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