Neuronal and nonneuronal taurine-like immunoreactivity in the sea pansy, Renilla koellikeri (Cnidaria, Anthozoa)

1997 ◽  
Vol 288 (1) ◽  
pp. 127-134 ◽  
Author(s):  
Michel Anctil ◽  
Cuong Ngo Minh
Keyword(s):  
Renilla Koellikeri

Modulation of rhythmic contractions by melatonin via cyclic GMP in the coelenterate Renilla koellikeri

1991 ◽  
Vol 161 (6) ◽  
pp. 569-575 ◽  
Author(s):  
M. Anctil ◽  
A. K. Pani ◽  
M. A. Ali
Keyword(s):  
Cyclic Gmp ◽  
Rhythmic Contractions ◽  
Renilla Koellikeri

Annual variations and sex-related differences of estradiol-17β levels in the anthozoan Renilla koellikeri

2002 ◽  
Vol 129 (1) ◽  
pp. 63-68 ◽  
Author(s):  
Vincent Pernet ◽  
Michel Anctil
Keyword(s):  
Annual Variations ◽  
Renilla Koellikeri ◽  
Estradiol 17Β

Spawning and gamete follicle rupture in the cnidarian Renilla koellikeri: effects of putative neurohormones

2004 ◽  
Vol 137 (1) ◽  
pp. 9-18 ◽  
Author(s):  
Marie-Ève Tremblay ◽  
Josée Henry ◽  
Michel Anctil
Keyword(s):  
Follicle Rupture ◽  
Renilla Koellikeri

IDENTIFICATION OF beta-LIKE ADRENOCEPTORS ASSOCIATED WITH BIOLUMINESCENCE IN THE SEA PANSY RENILLA KOELLIKERI

1993 ◽  
Vol 177 (1) ◽  
pp. 181-200 ◽  
Author(s):  
E. W. Awad ◽  
M. Anctil
Keyword(s):  
Radioligand Binding ◽  
Beta Blockers ◽  
Physiological Effect ◽  
The Body ◽  
Receptor Subtypes ◽  
Beta Adrenergic ◽  
Adrenergic Agents ◽  
Beta Agonists ◽  
Specificity Pattern ◽  
Renilla Koellikeri

Previous studies have reported pharmacological and biochemical evidence for the involvement of adrenergic substances in the regulation of neuroeffector activities in the bioluminescent cnidarian Renilla koellikeri (Cnidaria, Anthozoa). Therefore, direct radiobinding assays were developed to identify and characterize beta-adrenergic binding in membrane preparations from this species, using the two beta-antagonists [3H]dihydroalprenolol and [3H]CGP12177 as tracers. In addition, the effect of various beta-adrenergic agents on luminescence was examined. Binding of the radioligands at 25°C was rapid, reversible, saturable and specific. Saturation studies revealed the presence of two different and independent classes of binding site, site1 and site2, in the body of the colony (rachis). In contrast, homogeneous populations of binding sites corresponding to site1 were detected in autozooid polyps and to site2 in the peduncle. The pharmacological profile of beta-adrenergic binding in R. koellikeri membrane preparations displayed properties consistent with the presence of two sites and followed a pattern similar to beta2- and beta1-adrenergic receptor subtypes for site1 and site2, respectively. Bioluminescence in polyps was induced by beta-agonists as well as by one beta1-selective antagonist, atenolol, and was blocked by several beta-blockers including (+/−)CGP12177. The specificity pattern of the physiological effect of beta-adrenergic drugs on luminescence mirrors that of the radioligand interaction with site1. This suggests that radioligand binding to site1 represents binding to the receptor that mediates luminescence excitation in R. koellikeri. Blockade of the luminescent responses to site1 agonists by isotonic MgCl2 indicates that this beta-adrenergic mechanism must rely on interneuronal transmission. Collectively, these results suggest the evolutionary conservation of beta-adrenoceptors and of their dual character from coelenterates to higher vertebrates.

Positive coupling of beta-like adrenergic receptors with adenylate cyclase in the cnidarian Renilla koellikeri

1993 ◽  
Vol 182 (1) ◽  
pp. 131-146 ◽  
Author(s):  
E. W. Awad ◽  
M. Anctil
Keyword(s):  
Adenylate Cyclase ◽  
G Protein ◽  
Radioligand Binding ◽  
Guanine Nucleotides ◽  
Cyclase Activity ◽  
Adenylate Cyclase Activity ◽  
Binding Studies ◽  
Beta Adrenergic ◽  
Renilla Koellikeri ◽  
Stimulation Of

Coupling of the previously characterized beta1- and beta2-like adrenoceptors in the sea pansy Renilla koellikeri with adenylate cyclase was examined in membrane preparations from this cnidarian. Adenylate cyclase activity was stimulated by several guanine nucleotides, such as GTP, Gpp(NH)p and GTPgammaS. Fluoride ions and cholera toxin greatly enhanced the enzyme activity, whereas forskolin had no effect on basal or isoproterenol-induced stimulation of the enzyme. The stimulation of adenylate cyclase activity by several beta-adrenergic agonists in different parts of the animal reflected a positive coupling with the beta2- and beta1-like adrenoceptors in autozooid and peduncle tissues, respectively. In addition, isoproterenol-induced stimulation of adenylate cyclase activity was dependent on guanine nucleotides, suggesting coupling mediated by a G protein. The pharmacological profile of various antagonists on isoproterenol-sensitive adenylate cyclase in autozooid and peduncle tissues matched that of previous radioligand binding studies. Isoproterenol-induced stimulation of adenylate cyclase activity in rachidial tissues was partially inhibited by trifluoperazine of (+/−)CGP12177 and was completely blocked in the presence of both antagonists. This suggests that coupling of the enzyme occurs with beta1- and beta2-like adrenoceptors, both being present in the rachis. Serotonin and dopamine were also found to stimulate adenylate cyclase activity. Their stimulatory effect was additive to isoproterenol-induced activation, suggesting the presence of dopaminergic and serotonergic receptors in the tissues of the sea pansy. Along with the data presented previously on beta-adrenergic binding, this study suggests that elements of receptor-dependent G protein signal transduction originated early in invertebrate evolution.

scholarly journals Transient and delayed potassium currents in the egg cell membrane of the coelenterate, Renilla koellikeri.

1981 ◽  
Vol 318 (1) ◽  
pp. 123-141 ◽  
Author(s):  
S Hagiwara ◽  
S Yoshida ◽  
M Yoshii
Keyword(s):  
Cell Membrane ◽  
Potassium Currents ◽  
Egg Cell ◽  
Renilla Koellikeri

Evidence for biosynthesis and catabolism of monoamines in the sea pansy Renilla koellikeri (CNIDARIA)

1994 ◽  
Vol 25 (5) ◽  
pp. 465-474 ◽  
Author(s):  
A PANI ◽  
M ANCTIL
Keyword(s):  
Renilla Koellikeri
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