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First published online July 23, 2003

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Screening of second messengers involved in photocyte bioluminescence control of three ophiuroid species (Ophiuroidea: Echinodermata)

C. Vanderlinden^*, Y. Dewael and J. Mallefet

Laboratory of Marine Biology, Catholic University of Louvain, Place Croix du Sud, 3, B-1348 Louvain-la-Neuve, Belgium

View larger version (24K): [in a new window]   Fig. 1. Effects of 10-4 mol l-1 dibutyryl-cGMP (db-cGMP) and 10-3 mol l-1 sodium nitroprusside (Na nitro) on KCl-induced luminescence of A. filiformis, O. aranea and O. californica dissociated photocytes. Means ± S.E.M. are expressed as a percentage of photogenesis triggered by 200 mmol l-1 KCl in normal artificial seawater. **P<0.01; N, number of stimulated aliquot parts.

View larger version (22K): [in a new window]   Fig. 2. Effects of 10-4 mol l-1 dibutyryl-cAMP (db-cAMP), 10-4 mol l-1 forskolin (FSK), 10-5 mol l-1 MDL-12,330A (MDL) and 10-5 mol l-1 SQ22,536 on KCl-induced luminescence of A. filiformis, O. aranea and O. californica dissociated photocytes. Means ± S.E.M. are expressed as a percentage of photogenesis triggered by 200 mmol l-1 KCl and 50 mmol l-1 KCl (for FSK) in normal artificial seawater. *P<0.05; P<0.01; N, number of stimulated aliquot parts.

View larger version (23K): [in a new window]   Fig. 3. Effects of 10-4 mol l-1 3-isobutyl-1-methyl-xanthine (IBMX) and 10-4 mol l-1 pentoxifylline (pentoxi) on KCl-induced luminescence of A. filiformis, O. aranea and O. californica dissociated photocytes. Means ± S.E.M. are expressed as a percentage of photogenesis triggered by 200 mmol l-1 KCl in normal artificial seawater. **P<0.01; N, number of stimulated aliquot parts.

View larger version (24K): [in a new window]   Fig. 4. Effects of 5x10-6 mol l-1 U-73122, 5x10-7 mol l-1 U-73122, 5x10-6 mol l-1 U-73343 and 5x10-7 mol l-1 GF 109203X on KCl-induced luminescence of A. filiformis, O. aranea and O. californica dissociated photocytes. Means ± S.E.M. are expressed as a percentage of photogenesis triggered by 200 mmol l-1 KCl in normal artificial seawater. *P<0.05; P<0.01; N, number of stimulated aliquot parts.