Suppression of grasshopper sound production by nitric oxide-releasing neurons of the central complex.
The central complex of acridid grasshoppers integrates sensory information pertinent to reproduction-related acoustic communication. Activation of nitric oxide (NO)/cyclic GMP-signaling by injection of NO donors into the central complex of restrained Chorthippus biguttulus females suppresses muscarine-stimulated sound production. In contrast, sound production is released by aminoguanidine (AG)-mediated inhibition of nitric oxide synthase (NOS) in the central body, suggesting a basal release of NO that suppresses singing in this situation. Using anti-citrulline immunocytochemistry to detect recent NO production, subtypes of columnar neurons with somata located in the pars intercerebralis and tangential neurons with somata in the ventro-median protocerebrum were distinctly labeled. Their arborizations in the central body upper division overlap with expression patterns for NOS and with the site of injection where NO donors suppress sound production. Systemic application of AG increases the responsiveness of unrestrained females to male calling songs. Identical treatment with the NOS inhibitor that increased male song-stimulated sound production in females induced a marked reduction of citrulline accumulation in central complex columnar and tangential neurons. We conclude that behavioral situations that are unfavorable for sound production (like being restrained) activate NOS-expressing central body neurons to release NO and elevate the behavioral threshold for sound production in female grasshoppers.
Department of Neurobiology, Institute of Zoology, University of Göttingen, Berliner Strasse 28, 37073, Göttingen, Germany.
Anja
A
Weinrich
Michael
M
Kunst
Andrea
A
Wirmer
Gay R
GR
Holstein
Ralf
R
Heinrich
D000161:Acoustic Stimulation; D000819:Animal Communication; D000818:Animals; D001309:Auditory Threshold / Q000187:drug effects / Q000502:physiology; D001522:Behavior, Animal / Q000187:drug effects / Q000502:physiology; D001921:Brain / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D002956:Citrulline / Q000378:metabolism; D006152:Cyclic GMP / Q000378:metabolism; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005260:Female; D017952:Ganglia, Invertebrate / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D006110:Grasshoppers / Q000166:cytology / Q000378:metabolism*; D006146:Guanidines / Q000378:metabolism; D007150:Immunohistochemistry; D026602:Nitrergic Neurons / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D009569:Nitric Oxide / Q000378:metabolism*; D019001:Nitric Oxide Synthase / Q000037:antagonists & inhibitors / Q000378:metabolism; D012726:Sexual Behavior, Animal / Q000187:drug effects / Q000502:physiology
D004791:Enzyme Inhibitors; D006146:Guanidines; D002956:Citrulline; D009569:Nitric Oxide; D019001:Nitric Oxide Synthase; D006152:Cyclic GMP; C004479:pimagedine