Crossref journal-article
Rockefeller University Press
The Journal of Cell Biology (291)
Abstract

Rapid release of calcium from the sarcoplasmic reticulum (SR) of skeletal muscle fibers during excitation–contraction (e–c) coupling is initiated by the interaction of surface membrane calcium channels (dihydropyridine receptors; DHPRs) with the calcium release channels of the SR (ryanodine receptors; RyRs, or feet). We studied the early differentiation of calcium release units, which mediate this interaction, in BC3H1 cells. Immunofluorescence labelings of differentiating myocytes with antibodies against α1 and α2 subunits of DHPRs, RyRs, and triadin show that the skeletal isoforms of all four proteins are abundantly expressed upon differentiation, they appear concomitantly, and they are colocalized. The transverse tubular system is poorly organized, and thus clusters of e–c coupling proteins are predominantly located at the cell periphery. Freeze fracture analysis of the surface membrane reveals tetrads of large intramembrane particles, arranged in orderly arrays. These appear concomitantly with arrays of feet (RyRs) and with the appearance of DHPR/RyS clusters, confirming that the four components of the tetrads correspond to skeletal muscle DHPRs. The arrangement of tetrads and feet in developing junctions indicates that incorporation of DHPRs in junctional domains of the surface membrane proceeds gradually and is highly coordinated with the formation of RyR arrays. Within the arrays, tetrads are positioned at a spacing of twice the distance between the feet. The incorporation of individual DHPRs into tetrads occurs exclusively at positions corresponding to alternate feet, suggesting that the assembly of RyR arrays not only guides the assembly of tetrads but also determines their characteristic spacing in the junction.

Bibliography

Protasi, F., Franzini-Armstrong, C., & Flucher, B. E. (1997). Coordinated Incorporation of Skeletal Muscle Dihydropyridine Receptors and Ryanodine Receptors in Peripheral Couplings of BC3H1 Cells. The Journal of Cell Biology, 137(4), 859–870.

Authors 3 University of Pennsylvania
  1. Feliciano Protasi (first) University of Pennsylvania
  2. Clara Franzini-Armstrong (additional) University of Pennsylvania
  3. Bernhard E. Flucher (additional) University of Pennsylvania
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Dates
Type When
Created 23 years ago (July 26, 2002, 12:47 p.m.)
Deposited 2 years, 1 month ago (July 22, 2023, 2:50 a.m.)
Indexed 3 months, 3 weeks ago (April 28, 2025, 6:01 p.m.)
Issued 28 years, 3 months ago (May 19, 1997)
Published 28 years, 3 months ago (May 19, 1997)
Published Online 28 years, 3 months ago (May 19, 1997)
Published Print 28 years, 3 months ago (May 19, 1997)
Funders 0

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@article{Protasi_1997, title={Coordinated Incorporation of Skeletal Muscle Dihydropyridine Receptors and Ryanodine Receptors in Peripheral Couplings of BC3H1 Cells}, volume={137}, ISSN={1540-8140}, url={http://dx.doi.org/10.1083/jcb.137.4.859}, DOI={10.1083/jcb.137.4.859}, number={4}, journal={The Journal of Cell Biology}, publisher={Rockefeller University Press}, author={Protasi, Feliciano and Franzini-Armstrong, Clara and Flucher, Bernhard E.}, year={1997}, month=may, pages={859–870} }