Striated scallop muscle relaxation: Fast force transients produced by photolysis of Diazo-2

Relaxation of the myosin regulated striated adductor muscles of Pecten maximus was initiated by the photolysis of the caged Ca 2+ chelator, Diazo-2. The fibres relaxed to approximately 30% of the maximum tension with a mean half-time of 17.9±1.6 ms (n=7, temp 12°C), much faster than the rates observ...

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Veröffentlicht in:	Biochemical and biophysical research communications 1990-04, Vol.168 (1), p.295-300
Hauptverfasser:	Palmer, R.E., Mulligan, I.P., Nunn, C., Ashley, C.C.
Format:	Artikel
Sprache:	eng
Schlagworte:	Animals Biological and medical sciences Calcium - physiology Cell physiology Chelating Agents - pharmacology Diazonium Compounds Fundamental and applied biological sciences. Psychology In Vitro Techniques Kinetics Molecular and cellular biology Mollusca Muscle Contraction Muscle Relaxation Phenoxyacetates Photochemistry
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Zusammenfassung:	Relaxation of the myosin regulated striated adductor muscles of Pecten maximus was initiated by the photolysis of the caged Ca 2+ chelator, Diazo-2. The fibres relaxed to approximately 30% of the maximum tension with a mean half-time of 17.9±1.6 ms (n=7, temp 12°C), much faster than the rates observed in intact muscle at the same temperature. This indicates that in the intact adductor muscle the slower relaxation rate is determined by the speed of Ca 2+ removal from the sarcoplasm. The faster rate of relaxation of scallop muscle in vitro, compared with frog skeletal muscle may reflect different mechanisms of regulation of the crossbridge cycle.
ISSN:	0006-291X 1090-2104
DOI:	10.1016/0006-291X(90)91707-Y