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
Immune responses to lipopolysaccharide challenge in a tropical rodent (Funambulus pennanti): photoperiod entrainment and sex differences.
Raise Ahmad,Chandana Haldar +1 more
TL;DR: It is inferred that photoperiodic entrainment via the levels of melatonin and corticosterone synergistically supported more the survival of female squirrels under LPS-induced stress.
Journal ArticleDOI
Photoperiodic regulation of nuclear melatonin receptor RORα in lymphoid organs of a tropical rodent Funambulus pennanti: Role in seasonal oxidative stress
TL;DR: The results suggest that for reduction of seasonal oxidative stress melatonin might not be utilizing the nuclear receptor RORα pathway; rather the rise in circulatory melatonin collectively with tissue specificmelatonin might be protecting the splenic and thymic lymphocytes from the seasonal oxidative Stress.
Journal ArticleDOI
Ecofactors and effect of pinealectomy in regulation of seasonal testicular cycle in the Indian palm squirrel, Funambulus pennanti
C. Haldar,N. Saxena +1 more
TL;DR: It may be suggested that in the absence of the pineal the squirrels were unable to respond to environmental cues, and thus maintained themselves sexually active.
Journal ArticleDOI
Daily variations in plasma melatonin and melatonin receptor (MT1), PER1 and CRY1 expression in suprachiasmatic nuclei of tropical squirrel, Funambulus pennanti
TL;DR: It can be suggested that seasonally changing melatonin levels modulate MT1 expression dynamics in the SCN, altering its functional state, and gate SCN molecular “clock” gene profiles through changes in PER/CRY expression.
Journal ArticleDOI
Seasonal modulation of post-resection breast cancer metastasis.
Eun-Young Oh,Eun-Young Oh,Patricia A. Wood,Patricia A. Wood,Jovelyn Du-Quiton,Jovelyn Du-Quiton,William J. M. Hrushesky,William J. M. Hrushesky +7 more
TL;DR: The likelihood that human breast cancer seasonality is real and of biological origin is supported, and the incidence of post-resection pulmonary metastasis was not randomly distributed throughout the year, but peaked prominently in Summer and Winter.
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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