Abstract
The effect of desensitized cholinoceptors on the time course of end-plate currents was evaluated in frog skeletal muscle at a high (physiological) level of acetylcholine secretion in the presence of active acetylcholinesterase, with two-electrode recording of the membrane potential. When the number of cholinoceptors was small so that they did not appreciably affect the amplitude of end-plate currents or the parameters of onequantum responses (miniature currents), the decay of multiquantum currents was significantly accelerated. Moreover, the presence of cholinoceptors drastically reduced the ability of acetylcholinesterase inhibitors to prolong the decay of end-plate currents. It is suggested that desensitized cholinoceptors in a synapse with a physiological level of acetylcholine secretion and active acetylcholinesterase may bind free acetylcholine with high affinity and thus supplement the well-known physiological role of acetylcholinesterase in limiting the reactivation of postsynaptic membrane cholinoceptors
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
I. N. Volkova, G. I. Poletaev, and E. E. Nikol'skii,Fiziol. Zh. SSSR,61, 1433–1436 (1975).
R. A. Giniatullin, S. K. Bal'tser, E. E. Nikol'skii, and L. G. Magazanik,Neirofiziologiya,18, No 5, 645–654 (1986).
C. R. Anderson and C. F. Stevens,J. Physiol. (London),235, 655–691 (1973).
J. B. Cohen and N. P. Strand, in:Molecular Mechanisms of Desensitization to Signal Molecules, Eds. T. M. Konjinet al., Heidelberg (1987), pp. 257–273.
R. A. Giniatullin, Kh. S. Kharnitov, R. Khazipov,et al., J. Physiol. (London),412, 113–122 (1989).
R. A. Giniatullin, R. N. Khazipov, T. I. Oranska,et al., J. Physiol. (London),466, 105–114 (1993).
R. A. Giniatullin, R. N. Khazipov, and F. Vyskocil, pp. 95–103.
T. Heidmann and J.-P. Changeux,Europ. J. Biochem.,94, 255–279 (1979).
B. Katz and R. Miledi,J. Physiol. (London),231, 549–574 (1973).
B. Katz and S. Thesleff,J. Physiol. (London),138, 63–80 (1957).
L. G. Magazanik, E. E. Nikolsky, and F. Vyskocil,Europ. J. Pharmacol.,80, 115–119 (1982).
K. L. Magleby and B. S. Pallotta,J. Physiol. (London),316, 225–250 (1981).
L. G. Magazanik, V. A. Snetkov, R. A. Giniatullin, and R. N. Khazipov,Neurosci. Lett.,113, No 3, 281–285 (1990).
M. A. Maleque, C. Souccar, J. B. Cohen, and E. X. Albuquerque,Molec. Pharmacol.,22, 636–647 (1982).
Author information
Authors and Affiliations
Additional information
Translated fromByulleten' Eksperimental'noi Biologii i Meditsiny, Vol. 119, No. 6, pp. 578–581, June, 1995
Rights and permissions
About this article
Cite this article
Giniatullin, R.A., Talantova, M.V. Physiological role of desensitized cholinoceptors in skeletal muscle. Bull Exp Biol Med 119, 555–558 (1995). https://doi.org/10.1007/BF02443687
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02443687