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November 1, 1982Biochemical JournalOpen Access

Polymorphism of myofibrillar proteins of rabbit skeletal-muscle fibres. An electrophoretic study of single fibres

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Key result

Rabbit skeletal muscle fibers can be classified into four classes (I, IIA, IIB, and IIC) based on the electrophoretic distribution of fast- and slow-twitch isoforms of myofibrillar proteins.

Population

New Zealand White male adult rabbits

Design

Preclinical

Authors

GSG. SalviatiUniversity of MessinaRBRomeo BettoNeuroscience InstituteDDDaniela Danieli‐BettoUniversity of Padua

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Implication

Supports isoform-based fiber classification in rabbits; leaves open translation to human skeletal or cardiac muscle.

Key Points

  • The aim is to investigate the polymorphism of myofibrillar proteins in rabbit skeletal muscle fibres, specifically focusing on fast-twitch and slow-twitch isoforms.
  • Conducted one-dimensional polyacrylamide-gel electrophoresis on myofibrillar proteins from chemically skinned single fibres of rabbit muscles.
  • Classified muscle fibres into four classes using peptide maps of myosin and troponin subunits.
  • Analyzed the presence and distribution of isoforms in different skeletal muscle types.
  • Type I fibres exhibited a unique troponin isoform profile and predominance of beta-tropomyosin subunit.
  • Type IIB fast-twitch fibres showed only fast-twitch troponin subunits with alpha-tropomyosin dominance.
  • Type IIA fibres were identified by a specific myosin heavy chain type and a unique light chain composition.

Structured PICO

P
Population
Basic science study analyzing the myofibrillar protein composition of single skeletal muscle fibers from adult male New Zealand White rabbits.
E
Exposure
One-dimensional and two-dimensional polyacrylamide-gel electrophoresis of myofibrillar proteins of chemically skinned single fibers
O
Outcome
Distribution of fast-twitch-fibre and slow-twitch-fibre isoforms of myosin light chains and the type of myosin heavy chains, and classification of muscle fiberssurrogate

Electrophoretic analysis of single rabbit skeletal muscle fibers reveals distinct myofibrillar protein isoform patterns that correlate with histochemical fiber types I, IIA, IIB, and IIC.

Cite This Study

Salviati et al. (1982) studied Normal skeletal muscle (rabbit). Electrophoretic analysis of single muscle fibers was evaluated on Myofibrillar protein composition (myosin light and heavy chains, troponin, tropomyosin). Rabbit skeletal muscle fibers can be classified into four classes (I, IIA, IIB, and IIC) based on the electrophoretic distribution of fast- and slow-twitch isoforms of myofibrillar proteins.

synapsesocial.com/papers/6a309949912b1f0ec6bcaeffhttps://doi.org/10.1042/bj2070261
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Electrophoretic analysis of proteins from single bovine muscle fibres1981 · 69 citations
  2. 2FACTORS AFFECTING THE ACTIVITY OF ADENOSINE TRIPHOSPHATASE AND OTHER PHOSPHATASES AS MEASURED BY HISTOCHEMICAL TECHNIQUES1955 · 659 citations
  3. 3Characterization of human muscle myosins with respect to the light chains1981 · 35 citations
  4. 4Gene Expression of Myofibrillar Proteins in Single Muscle Fibers of Adult Chicken: Micro Two Dimensional Gel Electrophoretic Analysis11981 · 102 citations
  5. 5Mechanical properties and myosin light chain composition of skinned muscle fibres from adult and new‐born rabbits.1981 · 59 citations