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Indirect nervous control of luminescence in the polynoid worm harmothoe lunulata

, : Indirect nervous control of luminescence in the polynoid worm harmothoe lunulata. Journal of Experimental Zoology 206(3): 427-434

Light responses were recorded in vitro from isolated elytra of H. lunulata following field or intraganglionic stimulation. Similar responses were evoked through bath applicaton or microinjection of acetylcholine (ACh) at the level of the ganglion. Antimuscarinic but not antinicotinic inhibitors reversibly blocked these responses. In these conditions, when the nervous system is blocked, the preparation no longer responded to K+ depolarization or to electrical field stimulation (depolarizing or hyperpolarizing currents). A cholinergic nervous system probably controls light production through muscarinic receptors not localized at the level of the photocyte; the possibility that propagation of the stimulus involves epithelial conduction is ruled out. The activation may occur through relaying structures different from the epithelium. Ca2+ may be involved in the transmission process, since inhibitors of its movements block light response.


DOI: 10.1002/jez.1402060311

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