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Changes in the surface membrane during myoblast fusion

D H Curtis, K J Micklem, K Gill

    The Biochemical Journal
    |September 15, 1980
    PubMed
    Summary

    During chick embryo myoblast fusion, cell surface area and simple diffusion increase. However, facilitated transport of amino acids and sugars remains unchanged, indicating specific membrane function changes during this process.

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    Area of Science:

    • Cell Biology
    • Biochemistry
    • Developmental Biology

    Background:

    • Myoblast fusion is a critical process in skeletal muscle development.
    • Understanding changes in the cell surface membrane during fusion is key to muscle regeneration.
    • Previous studies have not fully elucidated the functional alterations of the myoblast plasma membrane during fusion.

    Purpose of the Study:

    • To investigate the specific changes in chick embryo myoblast surface membrane function during in vitro fusion.
    • To determine how myoblast fusion affects nutrient uptake, cell surface area, and enzyme activity.

    Main Methods:

    • Culturing chick embryo myoblasts and inducing fusion.
    • Measuring the uptake rates of specific amino acids and sugars (2-aminoisobutyrate, 2-deoxyglucose, alpha-methyl glucoside, choline).
    • Assessing cell surface area via light microscopy and quantifying iodinatable surface protein.
    • Determining adenylate cyclase activity in the presence and absence of fluoride.

    Main Results:

    • Facilitated uptake of 2-aminoisobutyrate and 2-deoxyglucose remained unaltered.
    • Uptake of alpha-methyl glucoside and choline approximately doubled.
    • Cell surface area and total/iodinatable surface protein content doubled.
    • Adenylate cyclase activity increased more than twofold.

    Conclusions:

    • Myoblast fusion leads to increased cell size and enhanced simple diffusion rates.
    • Facilitated transport processes for certain nutrients are maintained despite cell growth.
    • Specific functional adaptations occur in the surface membrane during myoblast fusion in vitro.

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