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Nitric oxide in luminescence of photophores from Argyropelecus hemigymnus Fernand F Baguet*; J Mallefet Lab.animal physiology,Univ. Cath. Louvain, Place Croix-du-Sud 5, Bâtiment Carnoy, Louvain-la-Neuve, 1348, Belgium      *(baguetf@bani.ucl.ac.be) The nitric oxide donors (NaNP, SNAP, Hydroxylamine) as well as the inhibitors of NO synthesis (thiocitrulline, Trim), affect the amplitude and the extinction rate of the adrenaline light response of isolated photophores, in a manner that depends on the capability of the preparations to luminesce.The nitric oxide donors reduce or inhibit the light response and simultaneously accelerate the light extinction rate: the magnitude of these effect is not constant but decreases with the intensity of the light emission.The inhibitors of NO synthesis increases the light response amplitude and reduces the extinction rate more especially as the intensity of the light response is low.The results suggest the presence of an NO syntase activity in the photophores of Argyropelecus hemigymnus; differences in NOS activity among fish photophores could explain the large variability in amplitude and kinetics characterizing the light responses of photophores to adrenaline: a high NOS activity should be present in the low luminescing organs, a feeble activity in the high luminescing organs. As the inhibition of GMPc synthesis by NOS does not change the adrenaline light response, it is suggested that the effects of NO are direct, mediated by nitrosation of proteins. [Talk: baguet.fernan.13531]

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