Journal ArticleDOI
Pineal Gland and Humidity Effects on Testicular Function of the Indian Palm Squirrel, Funambulus pennanti
Chandana Haldar,Nayni Saxena +1 more
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Results indicate that the pineal gland may be implicated in mediating the humdity information to control the male gonadal function in the Indian palm squirrel, Funambulus pennanti.Abstract:
The effect of two different conditions of humidity (80 +/- 5% and 40 +/- 5%) under stimulatory photoperiod (14L/10D) and high temperature (38 +/- 2 degrees C) was studied on the testes and accessory sex organs of the Indian palm squirrel, Funambulus pennanti, during the sexually active phase. High humidity (80 +/- 5%) reduced significantly the testes weight of the sham-operated animals as compared to the controls under natural environmental conditions but had no effect on that of pinealectomized animals. Moderate humidity (40 +/- 5%) did not affect the testes of sham-operated as well as pinealectomized animals, as compared to the respective controls. The seminal and prostatic weights showed no significant difference in high or moderate humidity conditions. However, the epididymal weight of the animals exposed to high humidity was significantly reduced in sham-operated animals only. Thus, these results indicate that the pineal gland may be implicated in mediating the humidity information to control the male gonadal function in the Indian palm squirrel, Funambulus pennanti.read more
Citations
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Journal ArticleDOI
Photoimmunomodulation and melatonin
Chandana Haldar,Raise Ahmad +1 more
TL;DR: Melatonin--one of the universally accepted chronobiotic molecule secreted by the pineal gland is now emerging as one of the most effective immunostimulatory compound in rodents and as oncostatic molecule at least in human.
Journal ArticleDOI
Photoperiodic regulation of MT1 and MT2 melatonin receptor expression in spleen and thymus of a tropical rodent Funambulus pennanti during reproductively active and inactive phases.
Raise Ahmad,Chandana Haldar +1 more
TL;DR: Differential hormonal level of melatonin and gonadal hormones during reproductively active and inactive phase and its direct relation with melatonin receptor expression dynamics in lymphoid organs could be responsible for seasonal adjustment of immunity and reproduction.
Journal ArticleDOI
Relationship between the annual rhythms in melatonin and immune system status in the tropical palm squirrel, Funambulus pennanti.
TL;DR: It is suggested that MEL is immuno-enhancing for this tropical squirrel, and plays an important role in the maintenance of its immunity in accordance with the seasonal changes in environmental factors and gonadal status.
Journal ArticleDOI
Seasonal changes in adrenal and gonadal activity in the quail, Perdicula asiatica: involvement of the pineal gland
TL;DR: It is indicated that changes in environmental factors promote annual variations in adrenal and gonadal activity probably by modulating the pineal gland.
Journal ArticleDOI
Photoperiod–Testicular–Immune Interaction in a Seasonal Breeder Indian Palm Squirrel Funambulus pennanti During the Reproductively Inactive and Active Phases
Raise Ahmad,Chandana Haldar +1 more
TL;DR: The peripheral melatonin level of those squirrels reflected the photoperiodic signal perceived by squirrels for immunomodulation and gonadal function, suggesting that immune system and Gonadal function might have coevolved.
References
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Book
Computational Handbook of Statistics
James L. Bruning,B. L. Kintz +1 more
TL;DR: In this paper, the authors present an analysis of correlation and correlation coefficients for the Mann-Whitney Test, the Newman-Keuls' and Tukey Mulitple-Comparison Tests, and the Signed-Pairs, Signed-Ranks Test.
Journal ArticleDOI
The Pineal and Its Hormones in the Control of Reproduction in Mammals
TL;DR: By the usual criteria in endocrinology, the pineal now fulfills all the qualifications of an organ of internal secretion.
Journal ArticleDOI
Circadian and circannual fluctuations of pineal indoleamines (serotonin and melatonin) in Testudo hermanni Gmelin (Reptilia, Chelonia). I. Under natural conditions of photoperiod and temperature.
TL;DR: Tortoise pineal serotonin and melatonin levels show marked circadian and circannual rhythms in a natural environment and the physiological significance of these rhythms remains to be determined and needs further investigation.
Book ChapterDOI
Annual rhythms: Perspective
TL;DR: The habitats of most organisms are subject to pronounced seasonal fluctuations, and numerous physiological functions like basal metabolism or growth rate change continuously with the time of year as a direct or indirect consequence of environmental seasonal variations.
Journal ArticleDOI
The independency of an intact pineal gland of the inhibition by 5-methoxytryptamine of the reproductive organs in the male hamster.
P Pévet,C Haldar-Misra,Ocal T +2 more
TL;DR: Results indicate that melatonin is not the only pineal factor inducing gonadal atrophy in the hamster, and 5-MT seems even more effective than melatonin under the same experimental conditions, also effective in the absence of the pineal.
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Photoperiodic regulation of MT1 and MT2 melatonin receptor expression in spleen and thymus of a tropical rodent Funambulus pennanti during reproductively active and inactive phases.
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