Showing papers by "Chandana Haldar published in 1999"
TL;DR: It is suggested that the photic information perceived by the mother alter her normal melatonin level, hence, passing through placenta melatonin influences the growth and sexual maturation of the young ones.
Abstract: The phenomenon of maternal transfer of photic information to their young ones is still an enigma. Existing reports in some rodents of temperate zone suggest that photoperiodic condition experienced by mother during their gestation period influences the pineal physiology of fetus, but nothing has been reported about the growth and sexual development of pups. Present experiment for the first time explains the effect of gestational photoperiod on the growth and sexual development of pups from a seasonally breeding tropical rodent F. pennanti. The results suggest that, constant light (LL; 24L: 0D) and long day length (LDL; 14L: 10D) experiencing mother conveyed the photic information to young ones to inhibit the pineal function, while short day length (SDL; 10L: 14D) stimulated the pineal function in pups. Altered pineal functions of pups ultimately interfered with their growth and sexual maturation. Most interestingly, the pups delivered by DD experiencing mothers and then reared under same condition, at the age of 40 days attained a level of growth and sexual maturity equivalent to the growth and sexual maturation of 60 days old pups under natural day length (NDL) condition. Therefore, we may suggest that the photic information perceived by the mother alter her normal melatonin level, hence, passing through placenta melatonin influences the growth and sexual maturation of the young ones.
8 citations
TL;DR: In this article, the effect of exogenous testosterone propionate (TP; 20 μg/animal/day; i.m. injection) on the biochemical constituents of pineal gland (PG) was studied.
Abstract: The pineal gland (PG) possesses receptor proteins capable of binding androgen with high affinity and specificity. However, the sensitivity of PG to exogenous testosterone (T) in term of biochemical constituents during different reproductive phases is still unknown. Hence, an attempt was made to study the effect of testosterone propionate (TP; 20 μg/animal/day; i.m. injection) on the biochemical constituents of PG i.e. protein, cholesterol, serotonin and plasma melatonin (MEL) level of the subtropical zone rodent, Funabulus pennanti during reproductive active (RAP) and inactive phases (RIP). During RAP, TP increased the plasma MEL level and prostate gland weight while, it had no effect on other biochemical constituents of PG, plasma T level and testes weight. It may be suggested that during the RAP, exogenous TP initiates the negative feed back mechanism at leydig cell level. Further, TP is known to affect directly the MEL synthesis by increasing the activity of PG. During RIP, TP decreased the PG...