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PMID: 3655718 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S.

Extra calcium on shortening in barnacle muscle. Is the decrease in calcium binding related to decreased cross-bridge attachment, force, or length?

The Journal of general physiology ·Vol. 90 ·No. 3 ·1987-09-00 ·Pages 321-40

Gordon AM, Ridgway EB

Abstract

Barnacle single muscle fibers were microinjected with the calcium-specific photoprotein aequorin. We have previously shown (Ridgway, E. B., and A. M. Gordon, 1984, Journal of General Physiology, 83:75-104) that when barnacle fibers are stimulated under voltage clamp and length control and allowed to shorten during the declining phase of the calcium transient, extra myoplasmic calcium is observed. The time course of the extra calcium for shortening steps at different times during the calcium transient is intermediate between those of free calcium and muscle force. Furthermore, the amplitude increases with an increased stimulus, calcium transient, and force. Therefore, the extra calcium probably comes from the activating sites on the myofilaments, possibly as a result of changes in calcium binding by the activating sites. The change in calcium binding may be due, in turn, to the change in muscle length and/or muscle force and/or cross-bridge attachment per se. In the present article, we show that the amount of the extra calcium depends on the initial muscle length, declining at shorter lengths. This suggests length-dependent calcium binding. The relation between initial length and extra calcium, however, parallels that between initial length and peak active force. The ratio of extra calcium to active force is therefore virtually independent of initial length. These data do not distinguish between a direct effect of length on calcium binding and an indirect effect owing to changes in cross-bridge attachment and force through some geometrical factor. The amount of extra calcium increases with the size of the shortening step, tending toward saturation for steps of greater than or equal to 10%. This experiment suggests that calcium binding depends on muscle force or cross-bridge attachment, not just length (if at all). There is much less extra calcium seen with shortening steps at high force when the high force results from stretch of the active muscle than when it results from increased stimulation of muscle.(ABSTRACT TRUNCATED AT 400 WORDS)

MeSH Terms
Animals Calcium/metabolism,physiology In Vitro Techniques Light Muscle Contraction Muscles/metabolism Thoracica/metabolism,physiology
Chemicals
Calcium
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Gordon A M
Department of Physiology and Biophysics, University of Washington, Seattle 98195.
Ridgway E B
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34 references, click to expand
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Article Info
Journal
The Journal of general physiology
Abbr.
J Gen Physiol
ISSN
0022-1295
DOI
10.1085/jgp.90.3.321
Published
1987-09-00
Pages
321-40
Language
English
Region
United States
NLM ID
2985110R
PMCID
PMC2228843
Subset
IM
Grants
NIADDK NIH HHS · AM-35597 · United States
NINDS NIH HHS · NS-08384 · United States
External Links
PubMed source DOI: 10.1085/jgp.90.3.321 PMC Full Text View journal details
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