... of a novel tank. We found a correlation between serotonin metabolism (5-HIAA:5-HT ratio) and boldness during the initial exposure to the tank in female animals. The DOPAC:DA ratio correlated with boldness behavior on the third day in male fish. There was no relationship between boldness and noradrenaline...

...Ann Jane Tierney ABSTRACT Invertebrate receptors for the neurotransmitter serotonin (5-HT) have been identified in numerous species from diverse phyla, including Arthropoda, Mollusca, Nematoda and Platyhelminthes. For many receptors, cloning and characterization in heterologous systems have...

...Julien Bacqué-Cazenave; Daniel Cattaert; Jean Paul Delbecque; Pascal Fossat ABSTRACT We injected serotonin (5-HT) into adult male crayfish before pairing them with size-matched non-injected competitors, and observed dyadic agonistic interactions. Paradoxically, 5-HT elicited opposite behavioral...

...Molly H. B. Amador; M. Danielle McDonald ABSTRACT The serotonin transporter (SERT) functions in the uptake of the neurotransmitter serotonin (5-HT) from the extracellular milieu and is the molecular target of the selective serotonin re-uptake inhibitors (SSRIs), a common group of anti-depressants...

... of the effect of 5-hydroxytryptamine (5-HT) on transepithelial potential (TEP), luminal ion concentrations and electrochemical potentials, as well as basolateral membrane potential and H + , Na + and K + fluxes. TEP, basolateral membrane potential, and H + , K + and Na + fluxes across the gastric caeca declined...

... of corticotropin-releasing factor (CRF), CRF-binding protein (CRF-BP), CRF receptors (CRFR1 and CRFR2), mineralocorticoid receptor (MR), glucocorticoid receptors (GR1 and GR2) and serotonin type 1A (5-HT 1A ) receptors (5-HT 1Aα and 5-HT 1Aβ ) were investigated at 1 h before and 0, 1 and 4 h after acute stress...

... clarkii ) have established that stress induces changes in brain serotonin (5-HT) concentrations that are responsible for the appearance of anxiety-like behavior (ALB). Here, we further analyze the roles of 5-HT and another biogenic amine, dopamine (DA), on the crayfish response to stress. We show...

...Kamila Shakarchi; Peter C. Zachar; Michael G. Jonz SUMMARY The chemosensory roles of gill neuroepithelial cells (NECs) in mediating the hyperventilatory response to hypoxia are not clearly defined in fish. While serotonin (5-HT) is the predominant neurotransmitter in O 2 -sensitive gill NECs...

.... The nitric oxide synthase inhibitor l -NAME increased mean force in metamorphic and juvenile frogs but not in prometamorphic tadpoles. Serotonin (5-HT) relaxed stomach muscle prior to metamorphosis but elicited a biphasic response in juveniles consisting of contraction at low concentrations and relaxation...

... methods. All nitrergic 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...

...Louis F. Gainey, Jr SUMMARY Pieces of gill isolated from the clam Mercenaria mercenaria clear colloidal graphite from seawater, and the clearance rates are measurable. 5-Hydroxytryptamine (5-HT) had a biphasic effect on clearance rates:concentrations from 10 –6 to 10 –5 mol l –1 5-HT increased...

... with maximum rates for both parameters occurring at 12:00 h. A strong synchrony between diurnal patterns of oxygen consumption, whole body urea content and J urea implicated metabolic regulation of the diurnal J urea pattern. Ketanserin, a 5-HT 2 receptor antagonist, and RU-486, a cortisol receptor antagonist...

... The Company of Biologists Limited 2004 2004 immune system immune-endocrine communication endotoxin corticotropin-releasing factor CRF α-MSH cortisol plasma CRF HPI-axis pituitary stress teleost telencephalon NE norepinephrine 5-HT serotonin Corticotropin-releasing hormone (CRH...

...Michael Hörner; Wendy A. Weiger; Donald H. Edwards; Edward A. Kravitz ABSTRACT Serotonin-containing neurosecretory neurons in the first abdominal ganglion (A1 5-HT cells) of the lobster ( Homarus americanus ) ventral nerve cord have been shown previously to function as ‘gain setters’ in postural...

... sensitive to 5-hydroxytryptamine (5-HT) than in its absence. Similar synergism is seen between 5-HT and extracts of the mesothoracic ganglionic mass (which is rich in the peptide diuretic hormone, DH) and between 5-HT and samples of haemolymph, also rich in peptide DH, from fed insects 1–2h after feeding...

... been inhibited by treatment with amiloride (open circles). The rates of fluid secretion by two control tubules are shown (filled circles). Fig. 6. (A) The rate of fluid secretion by two isolated Malpighian tubules of Rhodnius stimulated by 5-HT alone (control tubules, filled circles...

...S. H. P. Maddrell; W. S. Herman; R. L. Mooney; J. A. Overton ABSTRACT Bioassays of 5-hydroxytryptamine (5-HT) in fifth-instar Rhodnius prolixus haemolymph using Calliphora salivary glands indicate that: (1) biologically active 5-HT is present, (2) in unfed animals there is not enough 5-HT...