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Coupling of electrical activity from contralateral sinus glands.

R G Chiang, C G Steel

|April 1, 1985

Summary

Electrical activity in crustacean sinus glands (SG) synchronizes between the left and right sides. This coordination of neurosecretory cell (NSC) activity suggests different mechanisms regulate hormone release from paired glands.

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Area of Science:

Neuroendocrinology
Crustacean physiology
Cellular electrophysiology

Background:

The sinus gland (SG) is a major neuroendocrine organ in crustaceans.
Hormone release from the SG regulates various physiological processes.
Synchronized activity between paired SGs suggests coordinated regulation.

Purpose of the Study:

To investigate the electrical activity patterns in the sinus glands of the isopod, Oniscus asellus.
To determine if electrical activity is synchronized between the right and left SGs.
To explore the underlying mechanisms of synchronization between contralateral neurosecretory cells.

Main Methods:

Extracellular recordings of electrical activity from the sinus glands.
Analysis of synchronous electrical events in paired SGs.
Identification of distinct neurosecretory cell (NSC) types within the SG.

Main Results:

Bursts of electrical activity were recorded from the sinus glands.
Electrical activity occurred synchronously in the right and left SGs.
Synchronization was attributed to the coupling of two physiologically distinct neurosecretory cell (NSC) types between contralateral SGs.
The coupling mechanisms coordinating hormone release differed between the two NSC types.

Conclusions:

Crustacean sinus glands exhibit synchronized electrical activity between paired organs.
This synchronization is mediated by coupled neurosecretory cells.
Distinct neurosecretory cell types employ different coupling mechanisms to coordinate hormone release from contralateral sinus glands.

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