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Serotonin and nitric oxide interaction in the control of bioluminescence in northern krill, Meganyctiphanes norvegica (M. Sars)
Krönström, J.; Dupont, S.; Mallefet, J.; Thorndyke, M.; Holmgren, S. (2007). Serotonin and nitric oxide interaction in the control of bioluminescence in northern krill, Meganyctiphanes norvegica (M. Sars). J. Exp. Biol. 210(18): 3179-3187. dx.doi.org/10.1242/jeb.002394
In: Journal of Experimental Biology. Cambridge University Press: London. ISSN 0022-0949, more
Peer reviewed article  

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Keywords
    Meganyctiphanes norvegica (M. Sars, 1857) [WoRMS]; Marine
Author keywords
    bioluminescence; 5-HT; Meganyctiphanes norvegica; nitric oxide; nitricoxide synthase; krill

Authors  Top 
  • Krönström, J.
  • Dupont, S., more
  • Mallefet, J., more
  • Thorndyke, M., more
  • Holmgren, S.

Abstract
    The role of nitric oxide (NO) in the control of bioluminescence (light production) in the crustacean Meganyctiphanes norvegica (krill) was investigated using pharmacological and immunohistochemical methods. Allnitrergic drugs tested failed to induce bioluminescence per se but modulated light production stimulated by 5-hydroxytryptamine (5-HT). NO donors [sodium nitroprusside (SNP) and S-nitroso-N-acetylpenicillamine (SNAP)] injected in live specimens significantly reduced light production stimulated by 5-HT, whereas inhibition of the enzyme NO synthase (NOS) withl-NAME (NG-nitro-l-arginine methyl ester) resulted in an enhancement of the 5-HT response. The effects of NO do not seem to be mediated via production of cGMP as injections of a cGMP analogue (8-Bromoguanosine 3′,5′-cyclic monophosphate) gave inconclusive effects on the 5-HT-stimulated light response. Inhibition of cGMP production with ODQ (1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one) did not affect the light response. Moreover, a few individuals showed a considerably higher response to 5-HT in April and June compared with specimens collected in the autumn and winter. Furthermore, both NOS-like and 5-HT-like materials were detected by immunohistochemistry inside the light organs. NOS-like immunoreactivity was primarily observed in structures associated with vessels inside the light organs, whereas 5-HT-like material was abundant in nerve fibres throughout the whole light organ. The results suggest that NO has a modulatory role at several levels in the control of light production in M. norvegica and that NO and 5-HT interact in this regulation.

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