What question did this study set out to answer?

To determine the structural intermediates and cytoskeletal protein dynamics involved in the formation of mature myofibrils in developing cardiac muscle cells.

January 1, 1994Cell Motility and the Cytoskeleton

The premyofibril: Evidence for its role in myofibrillogenesis

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Authors

DRDukhee RheeUniversity of Pennsylvania JSJean M. SangerSUNY Upstate Medical University

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Implication

Supports stepwise myofibril assembly in vitro; leaves open relevance to in vivo human cardiac development or regeneration.

Key Points

To determine the structural intermediates and cytoskeletal protein dynamics involved in the formation of mature myofibrils in developing cardiac muscle cells.
Cultured embryonic chick cardiomyocytes in vitro to evaluate cell spreading and myofibrillar restructuring across lamellar extensions.
Mapped the distribution of sarcomeric and cytoskeletal proteins—including non-muscle myosin IIA/IIB, muscle-specific myosin, alpha-actinin, titin, zeugmatin, and C-protein—using isoform-specific antibody immunolocalization.
Identified three distinct zones of myofibrillar maturity: peripheral premyofibrils lacking muscle myosin, intermediate nascent myofibrils, and central mature myofibrils with fully aligned A-bands.
Non-muscle myosin IIB localized exclusively to pre- and nascent myofibrils and was replaced in mature myofibrils, which selectively incorporated C-protein, titin, and zeugmatin.
Sarcomeric alpha-actinin spacing progressively widened from 0.3–1.4 microns in premyofibrils and nascent myofibrils to full adult spacings of 1.8–2.5 microns in mature contractile myofibrils.

Cite This Study

Rhee et al. (1994) studied this question.

synapsesocial.com/papers/6a7d4d4aa3b6fd5035d5afa1 https://doi.org/10.1002/cm.970280102

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The premyofibril: Evidence for its role in myofibrillogenesis

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Key Points

Cite This Study

The premyofibril: Evidence for its role in myofibrillogenesis

Discussion

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Implication

Key Points

Cite This Study

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