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Chapter 5,954

Myogenic contractions in locust muscle induced by proctolin and by wasp philanthus triangulum venom

Piek, T.; Mantel, P.

Journal of Insect Physiology 23(3): 321-326

1977


ISSN/ISBN: 0022-1910
DOI: 10.1016/0022-1910(77)90269-4
Accession: 005953534

Myogenic slow contractions of the extensor tibiae of Locusta migratoria can be induced by proctolin [from Periplaneta americana proctodaeum] in a concentration of 10-10 to 10-9 mol/l perfusion fluid. Proctolin in a concentration of 10-8 mol/l causes a prolonged contraction interrupted by rhythmical relaxations. Higher concentrations of proctolin cause a powerful but irreversible contraction. In some preparations in which proctolin is ineffective in a concentration of 10-9 mol/l, a short stimulation of nerve 3b can initiate a series of rhythmic contractions. If nerve 3b is stimulated at the peak of such a contraction a rapid relaxation is induced. Administration of the venom of P. triangulum in a concentration which blocks the excitatory and inhibitory neuromuscular transmission, induces similar myogenic contractions. Stimulation of nerve 3b at the peak of such a contraction again causes a relaxation. Similar myogenic contractions can also be induced by administration of locust homogenate.

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