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Differences in temperature dependence of muscle contractile properties and myofibrillar atpase activity in a cold temperate fish myoxocephalus scorpius

, : Differences in temperature dependence of muscle contractile properties and myofibrillar atpase activity in a cold temperate fish myoxocephalus scorpius. Journal of Experimental Biology 111: 179-190

Single muscle fibers were isolated from the fast myotomal muscle of the teleost M. scorpius L. and chemically skinned with 1% Brij. Maximum Ca2+-activated force (P0) increased from 14.5 .+-. 1.1 N cm-2 at C to 19.1 .+-. 1.8 N cm-2 at C (mean .+-. SE). Maximum contraction velocity was determined by Hill's slack-test method (V0) and by extrapolation from force-velocity (P-V) relationships (Vmax). There was a linear relation between log10 V0 and temperature below C (Q10 = 1.9, P < 0.01). The force-velocity characteristics of the fibers were determined at and C. Points below 0.6 P0 on the P-V curve could be fitted by a linear form of Hill's equation. Extrapolated Vmax values were 0.55 muscle lengths s-1 (L0 s-1) at C and 1.54 L0 s-1 at C. Curvature of the P-V relationship was independent of temperature. The Mg2+,Ca2+-ATPase activity of Triton-X 100 extracted myofibrils was determined under similar ionic conditions to those used in skinned fiber experiments (ionic strength 0.16 mmol l-1, pMgATP 2.5). A linear relationship between log10 ATPase and temperature was only obtained below C (P < 0.001). Above C, the Q10 for ATPase decreased significantly. The Q10( for ATPase activity (3.9) was significantly higher than for unloaded contraction velocity. Supercontraction of isolated myofibrils to very short sarcomere lengths and differences in the mechanical constraints for crossbridge cycling between the preparations probably account for the lack of proportionality between these 2 parameters.

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