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The biosynthesis of sarcoplasmic reticulum
Federation Proceedings
|May 15, 1980
Summary
During muscle development, sarcoplasmic reticulum (SR) forms from endoplasmic reticulum by adding Ca2+ transport ATPase. Its synthesis is regulated by muscle and nerve factors, potentially influenced by intracellular calcium levels.
Area of Science:
- Biochemistry
- Cell Biology
- Developmental Biology
Background:
- Muscle differentiation involves the formation of specialized organelles like the sarcoplasmic reticulum (SR).
- The SR is crucial for calcium (Ca2+) transport, regulating muscle contraction.
- Understanding SR assembly provides insights into cellular development and specialized membrane formation.
Purpose of the Study:
- To investigate the assembly process of the sarcoplasmic reticulum (SR) during chicken embryo muscle development.
- To elucidate the synthesis and accumulation of Ca2+ transport ATPase during myogenesis.
- To explore the regulatory mechanisms governing Ca2+ ATPase synthesis.
Main Methods:
- Studied chicken embryo pectoralis muscle development.
- Analyzed the evolution of SR from rough endoplasmic reticulum.
- Investigated the insertion of Ca2+ transport ATPase synthesized on membrane-bound polysomes.
Main Results:
- SR develops from rough endoplasmic reticulum through the insertion of Ca2+ transport ATPase.
- Ca2+ ATPase synthesis increases significantly after myoblast fusion into myotubes.
- SR and myofibrillar protein accumulation follow a similar developmental timeline.
- Both myogenic and neurogenic factors regulate Ca2+ ATPase synthesis.
Conclusions:
- Muscle differentiation involves the progressive assembly of functional sarcoplasmic reticulum.
- Ca2+ transport ATPase accumulation is a key event in SR maturation.
- Developmental regulation of Ca2+ ATPase synthesis is complex, involving myogenic, neurogenic, and potentially calcium-mediated pathways.