Skeletal Muscle Differentiation
Skeletal Muscle Differentiation - Related Videos
10:25
Isolation of Intact Mitochondria from Skeletal Muscle by Differential Centrifugation for High-resolution Respirometry Measurements
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Cited by 26 •
2017
Here, a quadriceps muscle specimen is taken from an anaesthetized pig and mitochondria are isolated by differential centrifugation. Then, the respiratory rates of mitochondrial respiratory chain complexes I, II and IV are determined using high-resolution respirometry.
14:36
Adult and Embryonic Skeletal Muscle Microexplant Culture and Isolation of Skeletal Muscle Stem Cells
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Cited by 6 •
2010
The micro-dissected explants technique is a robust and reliable method for isolating proliferative skeletal muscle cells from juvenile, adult or embryonic muscles as a source of skeletal muscle stem cells. Uniquely, these cells have been clonally derived to produce skeletal muscle stem cell lines used for in vivo transplantation.
09:45
Mitochondrial Isolation from Skeletal Muscle
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Cited by 47 •
2011
This protocol describes a procedure to study the respiration of mitochondria isolated from skeletal muscles. This method was adapted from Scorrano et al. (2007). The mitochondrial isolation procedure requires about 2 hours. The mitochondrial respiration can be completed in about 1 hour.
01:48
Classification of Skeletal Muscle Fibers
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2019
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...
09:29
Skeletal Muscle Gender Dimorphism from Proteomics
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Cited by 4 •
2011
A straight-forward set of methods to isolate and determine the identity of the most abundant proteins expressed in skeletal muscle. About 800 spots are discerned on a two-dimensional gel from 10 mg muscle; this allows for the determination of gender-specific protein expression. These methods will give equivalent results in most tissues.
FAQs
MyoD and myogenin activate muscle-specific gene expression as precursor cells acquire a muscle identity. Their activity links molecular regulation to visible cellular changes, including withdrawal from the cell cycle, alignment, and formation of myotubes. Measuring these transcription factors alongside cell morphology helps researchers connect gene activation with progression toward specialized, contractile muscle cells.
Cell-cycle exit separates precursor-cell proliferation from the specialization program required for muscle formation. After leaving the cycle, myoblasts can align with neighboring cells and fuse into multinucleated myotubes. This sequence provides a useful framework for interpreting whether a laboratory culture is progressing from a precursor state toward organized skeletal muscle development.
Progress can be evaluated by combining molecular and structural observations. Activation of muscle-specific genes, including changes associated with MyoD and myogenin, provides a transcriptional readout, while cell-cycle exit, alignment, and fusion provide cellular readouts. Together, these measurements show whether precursor cells are advancing toward contractile skeletal muscle fibers rather than remaining in an earlier state.
Laboratory models provide controlled systems for examining factors that influence muscle growth and repair. Investigators can observe differentiation-related gene expression and cell behavior, then use the same system to study disease-associated changes, evaluate drug effects, or test strategies relevant to tissue engineering. Their value comes from linking controlled cellular changes with broader muscle biology.
These models allow researchers to examine how impaired muscle structure or function may arise during cellular development and maturation. They also provide a setting for evaluating how candidate treatments affect differentiation-related changes. Because the system is controlled, investigators can compare conditions that influence muscle growth or repair without relying only on observations from fully developed tissue.
The process connects cellular specialization with the biological roles of skeletal muscle. During development, it contributes to the formation of muscle tissue that supports movement. After injury, studying the same differentiation program helps researchers investigate repair. This connection also explains why disrupted differentiation is relevant to disorders involving abnormal muscle structure or function.