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J Neurophysiol 75: 2647-2650, 1996;
0022-3077/96 $5.00
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Journal of Neurophysiology, Vol 75, Issue 6 2647-2650, Copyright © 1996 by APS

ARTICLES

Selective activity of a proctolin analogue reveals the existence of two receptor subtypes

R. A. Baines, C. Walther, J. M. Hinton, R. H. Osborne and D. Konopinska
Sussex Centre for Neuroscience, University of Sussex, Brighton, United Kingdom.

1. The neuropeptide proctolin (Arg-Tyr-Leu-Pro-Thr) both potentiates neurally evoked contractions and causes contractures of insect skeletal muscle. In the hindleg extensor tibiae muscle of the locust, Schistocerca gregaria, the proctolin analogue [Afb (p-NO2)2]-proctolin is also able to potentiate neurally evoked contractions but is approximately 1,000-fold less effective in evoking contractures. 2. Proctolin and [Afb (p-NO2)2]-proctolin are equipotent in their ability to elevate the second-messenger inositol trisphosphate in isolated extensor tibiae muscle fiber membranes. 3. [Afb (p-NO2)2]-proctolin is approximately 1,000-fold less effective than proctolin in reducing the resting potassium conductance (GK) in extensor tibiae fibers. 4. We conclude that the action of proctolin on the extensor tibiae muscle is mediated by at least two receptor subtypes and that [Afb (p-NO2)2]-proctolin acts selectively on the receptor that potentiates neurally evoked contractions.


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