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Effects of 2,3-butanedione monoxime on the crossbridge kinetics in frog single muscle fibres

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Summary

The effects of 2,3-butanedione monoxime (BDM) on contraction characteristics were studied at 5‡C in single intact fibres isolated from the tibialis anterior muscle of the frog. The force-velocity relation was determined using the controlled-velocity method in either whole fibres or short fibre segments in which sarcomere shortening was measured by a laser light diffraction method. It is shown that 3mm BDM decreases the speed of rise and the amount of tetanus tension, reduces the maximum velocity of shortening and increases the curvature of the force-velocity relation, as well as the value for the stiffness to tension ratio. BDM also slowed down the redevelopment of tetanus tension after a period of unloaded shortening both in fixed-end and in length-clamp conditions. In normal and in BDM-treated fibres length-clamping increased the speed of the initial rise of tetanus tension but not that of the recovery after shortening. The observed force-velocity data points were fitted by the Huxley (1957) equation. It was found that BDM produces a conspicuous decrease of the rate constant for crossbridge attachment. This effect, and also a reduction of the force per crossbridge, are responsible for the depression of the contractile characteristics produced by BDM.

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Bagni, M.A., Cecchi, G., Colomo, F. et al. Effects of 2,3-butanedione monoxime on the crossbridge kinetics in frog single muscle fibres. J Muscle Res Cell Motil 13, 516–522 (1992). https://doi.org/10.1007/BF01737994

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