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De Bremaeker N, Baguet F, Mallefet J. Effects of catecholamines and purines on luminescence in the brittlestar Amphipholis squamata (Echinodermata). J Exp Biol 2000; 203:2015-23. [PMID: 10851118 DOI: 10.1242/jeb.203.13.2015] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The effects of catecholamines (dopamine, adrenaline, noradrenaline and its derivatives), 5-hydroxytryptamine and purines (adenosine, ATP and their derivatives) on the acetylcholine-induced luminescence of isolated arms and dissociated photocytes of the luminescent ophiuroid Amphipholis squamata were tested. The results showed that catecholamines and 5-hydroxytryptamine (10(−)(5) to 10(−)(3)mol l(−)(1)) had a strong dose-dependent inhibitory effect on acetylcholine-induced luminescence. In contrast, purines (10(−)(4) and 10(−)(3)mol l(−)(1)) triggered luminescence in the absence of acetylcholine and/or potentiated acetylcholine-induced luminescence. The results with specific purinergic agonists and antagonists indicated the involvement of P(1)- and P(2)-like purinoceptors in the control of luminescence. Our study suggests that, in addition to the previously described cholinergic system in Amphipholis squamata, there may be a purinergic system, acting in synergy with acetylcholine, and an inhibitory neuromodulatory catecholaminergic system, all associated with the control of luminescence.
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Affiliation(s)
- N De Bremaeker
- Laboratory of Animal Physiology, Université Catholique de Louvain, Belgium
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Bremaeker ND, Baguet F, Thorndyke MC, Mallefet J. Modulatory effects of some amino acids and neuropeptides on luminescence in the brittlestar amphipholis squamata. J Exp Biol 1999; 202 (Pt 13):1785-91. [PMID: 10359681 DOI: 10.1242/jeb.202.13.1785] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Amphipholis squamata is a polychromatic luminescent ophiuroid. The effects of amino acids (γ -aminobutyric acid, GABA, taurine, glycine and glutamate), N-methyl-d-aspartate (NMDA) and the invertebrate neuropeptides Antho-RFamide, FMRFamide and SALMFamides S1 and S2 were tested on acetylcholine-induced luminescence from isolated arms of clear and black specimens of Amphipholis squamata. The results showed that GABA, glycine and Antho-RFamide inhibited ACh-induced luminescence of clear specimens and had no significant effect on black specimens. Glutamic acid had no significant effect on ACh-induced luminescence, but triggered luminescence in the absence of ACh in both types of specimen. Taurine, NMDA and FMRFamide showed no significant effects on either clear or black specimens. S1 potentiated ACh-induced luminescence of clear and black specimens, while S2 had no clear modulatory effect on luminescence. These results suggest that, in addition to the previously described cholinergic system in Amphipholis squamata, there is also a modulatory component to luminescence control. Moreover, we observed a difference in modulation of luminescence between clear and black specimens.
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Affiliation(s)
- ND Bremaeker
- Laboratory of Animal Physiology, Universite Catholique de Louvain, Place Croix du Sud 5, Belgium and School of Biological Sciences, Royal Holloway College, University of London, Egham, Surrey TW20 0EX, UK.
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Mallefet J, Baguet F, Fauville C. Modulatory effects of adenosine onPorichthys luminescence. ACTA ACUST UNITED AC 1993. [DOI: 10.1002/jez.1402660102] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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