Abstract
Much interest has recently centred on the properties of peptides that modulate the excitability of nerve cells. Such compounds include the undecapeptide substance P, which is particularly well established as an excitatory neu retransmitter1,2, and we examine here its effects on magnocellular cholinergic neurones taken from the medial and ventral aspects of the globus pallidus of newborn rats and grown in dissociated culture3. These neurones have previously been shown to respond to substance P3 and are analogous to the nucleus basalis of Meynert in man4,5, which gives a diffuse projection to the cerebral cortex and whose degeneration is the likely cause of Alzheimer's disease5. Substance P depolarizes these cultured neurones by reducing an inwardly rectifying potassium conductance; this conductance has been found in several neuronal types6–9 and has similar properties to those of certain other cells10–13. As discussed below, modulation of inward (or anomalous) rectification by substance P implies a self-reinforcing element to the depolarization caused by the peptide.
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Author notes
- P. R. Stanfield
Present address: Department of Physiology, University of Leicester, Leicester LE1 7RH, UK.
Affiliations
Department of Biological Sciences, Purdue University, West Lafayette, Indiana 47907, USA
- P. R. Stanfield
- , Yasuko Nakajima
- & Kazuhiko Yamaguchi
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