Hydrogen sulfide is synthesized in the gills of the clam Mercenaria mercenaria and acts seasonally to modulate branchial muscle contraction.

From: The Biological Bulletin | Date: August 1, 2005| Author: Gainey, Louis F., Jr.; Greenberg, Michael J. | Copyright information

Previously we showed that when the gill muscles of the venerid clam Mercenaria mercenaria are stimulated to contract by 5-hydroxytryptamine (5HT), the contraction is about doubled when another identical dose of 5HT is applied after washout. Furthermore, this "endogenous potentiation" is mimicked by nitric oxide (NO), which is synthesized in the gill. We now report that the isolated gills also synthesize [H.sub.2]S; the basal rate of synthesis was 0.70 [micro]mol * [g.sup.-1] * [h.sup.-1] (s...

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