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Vol. 9, Issue 1, 47-61, January 1998
Department of Physiology, University of Maryland School of
Medicine, Baltimore, Maryland 21201
Skeletal muscle contains spectrin (or spectrin I) and fodrin (or
spectrin II), members of the spectrin supergene family. We used
isoform-specific antibodies and cDNA probes to investigate the
molecular forms, developmental expression, and subcellular localization
of the spectrins in skeletal muscle of the rat. We report that
-spectrin (
I) replaces
-fodrin (
II) at the sarcolemma as
skeletal muscle fibers develop. As a result, adult muscle fibers contain only
-fodrin (
II) and the muscle isoform of
-spectrin (
I
2). By contrast, other types of cells present in skeletal muscle tissue, including blood vessels and nerves, contain only
-
and
-fodrin. During late embryogenesis and early postnatal development, skeletal muscle fibers contain a previously unknown form
of spectrin complex, consisting of
-fodrin,
-fodrin, and the
muscle isoform of
-spectrin. These complexes associate with the
sarcolemma to form linear membrane skeletal structures that otherwise
resemble the structures found in the adult. Our results suggest that
the spectrin-based membrane skeleton of muscle fibers can exist in
three distinct states during development.
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