The Journal of Neurophysiology Vol. 80 No. 6 December 1998, pp. 2893-2899
Copyright ©1998 The American Physiological Society

Functional and Immunocytochemical Identification of Glutamate Autoreceptors of an NMDA Type in Crayfish Neuromuscular Junction

N. Feinstein¹, D. Parnas², H. Parnas¹, J. Dudel^{1, 3}, and I. Parnas¹

¹ The Otto Loewi Center for Cellular and Molecular Neurobiology and Department of Neurobiology; and ² Department of Biological Chemistry, The Hebrew University of Jerusalem, Jerusalem, Israel 91904; and ³ Department of Physiology, The Technical University, Munich, Germany

Feinstein, N., D. Parnas, H. Parnas, J. Dudel, and I. Parnas. Functional and immunocytochemical identification of glutamate autoreceptors of an NMDA type in crayfish neuromuscular junction. J. Neurophysiol. 80: 2893-2899, 1998. N-Methyl-D-aspartate (NMDA) reduces release from crayfish excitatory nerve terminals. We show here that polyclonal and monoclonal antibodies raised against the mammalian postsynaptic NMDA receptor subunit 1 stain specifically the presynaptic membrane of release boutons of the crayfish neuromuscular junction. In crayfish ganglionic membranes, the polyclonal antibody recognizes a single protein band that is somewhat larger (by ~30 kD) than the molecular weight of the rat receptor. Moreover, the monoclonal (but not the polyclonal) antibody abolishes the physiological effect of NMDA on glutamate release. The monoclonal antibody did not prevent the presynaptic effects of glutamate, which also reduces release by activation of quisqualate presynaptic receptors. Only when 6-cyano-7-nitroquinoxatine-2,3,dione (CNQX) was added together with the monoclonal antibody was the presynaptic effect of glutamate blocked. These results show that presynaptic glutamate receptors of the crayfish NMDA type are involved in the regulation of neurotransmitter release in crayfish axon terminals. Although the crayfish receptor differs in its properties from the mammalian NMDA receptor, the two receptors retained some structural similarity.

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