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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TLDR
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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Journal ArticleDOI
Effect of pinealectomy on photoperiodic gonadal response of Indian palm squirrel, Funambulus pennanti
C. Haldar-Misra,M. Srivastava +1 more
TL;DR: The role of the pineal gland in mediating the effects of photoperiod on the reproductive axis is not well established in tropical mammals, but when Indian palm squirrels (Funambulus pennanti) were exposed to sunlight, they showed marked changes in their sexual behaviour.
Journal ArticleDOI
A stereological study of the effects of the pineal gland on the ventral prostate of the rat.
TL;DR: The results differ from those described by others following castration in rats, indicating that the action of the pineal gland on the ventral prostate may be different from that of androgen deprivation, in this species.
Book ChapterDOI
Introduction: What is Environmental Endocrinology?
Ivan Assenmacher,D. S. Farner +1 more
TL;DR: The concept of environmental endocrinology, like those of many biologic “disciplines” in general, is an artificial consequence of reductionism.
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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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