Abstract

Locusta-diuretic peptide ( Locusta-DP) is a potent stimulant of fluid secretion and cyclic AMP production by locust Malpighian tubules. In this study, a polyclonal antiserum raised to the C- terminus of Locusta-DP reveals a wide distribution of immunoreactive cell bodies and processes throughout the CNS, and endings in two important neurohemal release sites: the corpora cardiaca and the perivisceral organs. HPLC fractionation of CNS, neurohemal structures, and hemolymph reveals immunoreactive material that coelutes with synthetic Locusta-DP and stimulates cyclic AMP production by locust tubules. The identity of the immunoreactive and biologically active material is confirmed as authentic Locusta-DP by mass spectrometry.

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