...Aymam C. de Figueiredo; Stefanny C. M. Titon; João C. Cyrino; Letícia A. K. Nogueira; Fernando R. Gomes ABSTRACT Mammals show immune up-regulation and increased plasma and local (gastrointestinal tract) concentrations of some immunoregulatory hormones, such as corticosterone and melatonin, after...

..., by disrupting the nocturnal production of the hormone melatonin. Nestlings were exposed to a light source emitting 3 lx for seven consecutive nights. Subsequently, nestlings were immune challenged with a lipopolysaccharide injection, and we measured haptoglobin and nitric oxide levels pre- and post-injection...

...Cristina Sáenz de Miera; Matthew Beymer; Kevin Routledge; Elżbieta Król; Colin Selman; David G. Hazlerigg; Valérie Simonneaux ABSTRACT MSM/Ms (MSM) is a mouse strain derived from Japanese wild mice, Mus musculus molossinus , that maintains the ability to synthesize melatonin in patterns reflecting...

...Sara Lupi; Virginie Canoine; Paolo Pedrini; Leonida Fusani ABSTRACT The hormone melatonin, a main component of the avian circadian system, plays an important role in the physiological transitions that accompany activation of the migratory phenotype in passerine birds. Most small passerines migrate...

... Urban ecology ALAN Hormones Metabolism Stress Sleep Glucocorticoid Thyroid Melatonin Organisms have evolved under a natural dark and light cycle for millions of years, so their ability to survive and reproduce depends on not only occupying a favorable spatial niche but also an optimal...

...Jan S. Boratyński; Małgorzata Jefimow; Michał S. Wojciechowski ABSTRACT The duration of melatonin (MEL) secretion conveys information about day length and initiates a cascade of seasonal phenotypic adjustments in photoresponsive mammals. With shortening days, animals cease reproduction, minimize...

...-licence-1-1/ Summary: Daytime light intensity affects physiological and behavioural functions of not only diurnal but also nocturnal small mammals. Photoperiodic species Circadian rhythms Activity Urine production Melatonin The lives of mammals are governed by a plethora...

...Marcos A. López-Patiño; Manuel Gesto; Marta Conde-Sieira; José L. Soengas; Jesús M. Míguez Cortisol has been suggested to mediate the effect of stress on pineal melatonin synthesis in fish. Therefore, we aimed to determine how pineal melatonin synthesis is affected by exposing rainbow trout...

...Ni Y. Feng; Andrew H. Bass Melatonin is a well-documented time-keeping hormone that can entrain an individual's physiology and behavior to the day–night cycle, though surprisingly little is known about its influence on the neural basis of social behavior, including vocalization. Male midshipman...

...D. Cazaméa-Catalan; E. Magnanou; R. Helland; L. Besseau; G. Boeuf; J. Falcón; E. H. Jørgensen SUMMARY Melatonin contributes to synchronizing major biological and behavioral functions with cyclic changes in the environment. Arylalkylamine N -acetyltransferase (AANAT) is responsible for a daily...

...Lilach Ashkenazi; Abraham Haim SUMMARY Light at night and light interference (LI) disrupt the natural light:dark cycle, causing alterations at physiological and molecular levels, partly by suppressing melatonin (MLT) secretion at night. Heat shock proteins (HSPs) can be activated in response...

... during the night. A similar decrease in parameters related to glucosensing in the liver was observed when fish under day conditions were treated with melatonin, suggesting a modulatory role of melatonin in day–night changes of the glucosensing response in the same tissue. In previous studies...

... to classical neurotransmitters and nitric oxide but produced light after melatonin (MT) application. Prolactin and α-melanocyte-stimulating hormone inhibited this hormonally induced luminescence as well as the spontaneous luminescence from the photogenic tissue. The action of MT seems to be mediated by binding...

...Marcos A. López-Patiño; Arnau Rodríguez-Illamola; Manuel Gesto; José L. Soengas; Jesús M. Míguez Melatonin has been suggested to play a role in fish osmoregulation, and in salmonids has been related to the timing of adaptive mechanisms during smolting. It has been described that acclimation...

...Julien M. Claes; Jenny Krönström; Susanne Holmgren; Jérôme Mallefet SUMMARY Photophores (photogenic organs) of the lantern shark Etmopterus spinax are under hormonal control, with prolactin (PRL) and melatonin (MT) triggering the light emission. Differential sensitivity to these hormones in adult...

... that in the largest of these zones (ventral zone), photophores are under hormonal control, light being triggered by both melatonin (MT) and prolactin (PRL). In this study, we analysed the luminescent responses to MT and PRL in five other luminous zones from 12 female and eight male E. spinax specimens. The results...

.... Isolated photophore-filled skin patches produced light under melatonin (MT) and prolactin (PRL) stimulation in a dose-dependent manner but did not react to classical neurotransmitters. Theα-melanocyte-stimulating hormone (α-MSH) had an inhibitory effect on hormonal-induced luminescence. Because luzindole...

...) diel melatonin and corticosterone rhythms; (2) sex steroid hormone and corticosterone profiles; and (3) the expression of reproductive behavior following emergence. Elevated hibernation temperatures (i.e. 10°C versus 5°C) significantly increased overall melatonin and decreased corticosterone...

...-pigmentary antioxidant(melatonin) in the drinking water. If the antioxidant properties of melatonin protect carotenoids from oxidation, we predict that birds supplemented with melatonin should have redder bills than birds not supplemented with melatonin,and that birds supplemented with carotenoids...

...Gaia Izzo; Michela d'Istria; Ismene Serino; Sergio Minucci SUMMARY In the present study, we have utilized 17β-estradiol to induce the increase of mast cell number in order to verify the melatonin effect on mast cell accumulation in the frog testicular interstitium. Data obtained from in vivo...