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Seite 1 von 650 Ergebnisse
Pinealectomy and constant release of melatonin or 5-methoxytryptamine induce testicular atrophy in the European hamster (Cricetus cricetus, L.).
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The role of the pineal and of photoperiod in the regulation of gonadal activity has been studied in the European hamster, a wild hamster commonly found in the vicinity of Strasbourg, France. Besides the presence of a probable endogenous circannual rhythm in reproductive capacities, it appears that,
Subcutaneous melatonin implants inhibit reproductive atrophy in male hamsters induced by daily melatonin injections.
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Daily afternoon (at 7 p.m.) injections of melatonin (25 microng in oil) into adult male hamsters for 50 days led to atrophy of the testes and accessory sex organs (seminal vesicles and coagulating glands) and in a significant depression in pituitary LH and prolactin content and concentration. These
Beneficial effects of melatonin on stroke-induced muscle atrophy in focal cerebral ischemic rats.
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MUSCLE ATROPHY IS THE RESULT OF TWO OPPOSING CONDITIONS THAT CAN BE FOUND IN PATHOLOGICAL OR DISEASED MUSCLES: an imbalance in protein synthesis and degradation mechanisms. Thus, we investigated whether exogenous melatonin could regulate muscle components in stroke-induced muscle atrophy in rats.
Melatonin prevents lipid peroxidation in human erythrocytes but augments deterioration of deformability after in vitro oxidative stress.
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Oxidative stress decreases the deformability of erythrocytes. Anti-oxidant measures may alleviate, pro-oxidative damage may augment this decrease. Melatonin is reported to exert both anti-oxidant and pro-oxidant properties on erythrocytes. The aim of the present study was to evaluate the effects of
Effects of pinealectomy and melatonin on the retrograde degeneration of retinal ganglion cells in a novel model of intraorbital optic nerve transection in mice.
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The effects of pinealectomy and of intraperitoneally administered melatonin on the retrograde degeneration of retinal ganglion cells (RGCs) were examined in a novel model of optic nerve (ON) transection in C57BL/16J mice. RGCs were prelabeled with the fluorescent tracer
Correlation between serum melatonin and aMT6S level for age-related macular degeneration patients.
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To analyze the levels of serum melatonin (MLT) and assay of 6-sulfatoxymelatonin (aMT6S) of age-related macular degeneration (AMD) patients and study their correlation with AMD risk factors.
58 AMD cases were selected and 58 healthy cases of the same time period were selected according to 1:1
Melatonin Protects Intervertebral Disc from Degeneration by Improving Cell Survival and Function via Activation of the ERK1/2 Signaling Pathway.
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Melatonin, a neuroendocrine hormone secreted by the pineal body, has a positive effect on intervertebral disc degeneration. The present study is aimed at investigating the biological role of melatonin in intervertebral disc degeneration and its underlying mechanism. A human nucleus pulposus cell
Red-light-induced suppression of melatonin synthesis is mediated by N-methyl-D-aspartate receptor activation in retinally normal and retinally degenerate rats.
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Pineal gland N-acetyltransferase (NAT) activity and pineal and serum levels of melatonin declined linearly in albino rats acutely exposed to different intensities of red light (600 nm or higher; low, 140 microW/cm2; moderate, 690 microW/cm2; high, 1200 microW/cm2) during the middle of the night. The
Melatonin delays photoreceptor degeneration in a mouse model of autosomal recessive retinitis pigmentosa.
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Retinitis pigmentosa (RP) comprises a group of incurable inherited retinal degenerations. Targeting common processes, instead of mutation-specific treatment, has proven to be an innovative strategy to combat debilitating retinal degeneration. Growing evidence indicates that melatonin possesses a
The effect of twice daily gonadotropin-releasing hormone (GnRH) administration and/or renal pituitary homografts on melatonin-induced gonadal atrophy in male Syrian hamsters.
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Adult hamsters were maintained in a 14:10 light:dark cycle and divided into the following experimental groups: 1) controls, 2) daily afternoon (1600h) injections of 25 micrograms of melatonin (MEL), 3) daily MEL (1600) injections and twice daily (0900 and 1600h) injections of 1 microgram GnRH, 4)
[Potential of melatonin for prevention of age-related macular degeneration: experimental study].
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Decline with age of the content of melatonin is considered as one of the leading mechanisms of aging and development of associated diseases, including age-related macular degeneration (AMD)--the disease, which becomes the most common cause of blindness and acuity of vision deterioration in elderly.
Melatonin delays photoreceptor degeneration in the rds/rds mouse.
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Photoreceptors in retinitis pigmentosa (RP), a group of inherited retinal degenerative diseases, die through apoptosis. Since melatonin protects against neuronal apoptotic death, we tested its ability to slow photoreceptor degeneration in the rds/rds mouse, an animal model for RP. Shortly after
Role of melatonin in reducing water avoidance stress-induced degeneration of the liver.
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Melatonin, a pineal secretory product, is a potent scavenger of a variety of free radicals. We investigated the role of melatonin on water avoidance stress (WAS)-induced degenerations of the liver parenchyme. Wistar albino rats were exposed to acute WAS (aWAS group) or chronic WAS (cWAS group).
Role of melatonin in reducing water avoidance stress-induced degeneration of the gastrointestinal mucosa.
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We investigated the role of melatonin on water avoidance stress (WAS)-induced degeneration of the gastric, ileal and colonic mucosa. Wistar albino rats were exposed to acute WAS (aWAS group) or chronic WAS (cWAS group). Before exposing animals to acute (aWAS + mel group) or chronic WAS (cWAS + mel
Melatonin and abeta, macular degeneration and alzheimers disease: same disease, different outcomes?
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Aging is the common denominator and the highest risk factor for macular degeneration and Alzheimers Disease (AD). Important pathological hallmarks common to both diseases are the presence of amyloid β (Aβ) in the senile plaques of the AD brain and in the drusen of age-related macular degeneration
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