What question did this study set out to answer?

To investigate the temporal expression and intracellular distribution of calsequestrin and Ca(2+)+Mg(2+)-dependent ATPase during the differentiation of rat skeletal muscle cells in culture.

July 1, 1977The Journal of Cell Biology

Assembly of the sarcoplasmic reticulum proteins in differentiating rat skeletal muscle cell cultures: localization by immunofluorescence of sarcoplasmic reticulum proteins in differentiating rat skeletal muscle cell cultures

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Authors

AJAO Jorgensen KVKalnins ViUniversity of Toronto EZE Zubrzyca

Discussion

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Implication

In vitro study reveals distinct spatial and temporal assembly of calsequestrin and ATPase in rat myoblasts, indicating distinct local biogenesis pathways during muscle differentiation.

Key Points

To investigate the temporal expression and intracellular distribution of calsequestrin and Ca(2+)+Mg(2+)-dependent ATPase during the differentiation of rat skeletal muscle cells in culture.
Cultured primary rat skeletal muscle cells over various time periods under normal conditions and low-Ca(2+) conditions that block myoblast fusion.
Tracked the spatial and temporal localization of calsequestrin and Ca(2+)+Mg(2+)-dependent ATPase using immunofluorescent staining techniques.
Calsequestrin was detected at 45 hours initially near the nucleus before spreading into fibrous patterns, whereas the ATPase appeared later at 60 hours as dispersed cytoplasmic foci.
Both proteins were synthesized in myoblasts cultured past 60 hours in low Ca(2+) medium despite cell fusion being completely inhibited.
Multinucleated muscle cells demonstrated organized, alternating fluorescent and dark strands aligned parallel to the longitudinal cell axis for both proteins.

Cite This Study

Jorgensen et al. (1977) studied this question.

synapsesocial.com/papers/6a911f64c39ca0eda18311f9 https://doi.org/10.1083/jcb.74.1.287

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Implication

In vitro study reveals distinct spatial and temporal assembly of calsequestrin and ATPase in rat myoblasts, indicating distinct local biogenesis pathways during muscle differentiation.