Abstract
Several neurotoxins have been isolated from bee venom1. One of these, the mast cell degranulating peptide (MCD), releases histamine from mast cells and on central administration produces arousal at low concentrations and convulsions at higher doses2,3. These effects are mediated through specific high-affinity binding sites4 which are concentrated in cortical structures, notably the hippocampus3. This structure appears to be the source of changes in the electrocorticogram that follow injections of MCD into the cerebral ventricle, and which induce a quasi-permanent hippocampal theta rhythm in the motionless rat alternating with epileptiform spike waves3. We report here that brief application of MCD to the CA1 region of hippocampal slices induces long-term potenti-ation, that is, a long-lasting increase in the efficacy of synaptic transmission. This potentiation seems to be indistinguishable from the classical LTP produced by trains of high-frequency electrical stimulation5,6 and considered to be related in some way to memory. Using binding to synaptosomal membranes and radioimmunoassay techniques, we have also found an endogenous peptide equivalent of MCD in brain extracts. This raises the possibility that a MCD-like peptide may be important in long-term potentiation.
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References
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Cherubini, E., Ari, Y., Gho, M. et al. Long-term potentiation of synaptic transmission in the hippocampus induced by a bee venom peptide. Nature 328, 70–73 (1987). https://doi.org/10.1038/328070a0
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DOI: https://doi.org/10.1038/328070a0
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