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1

Ovarian steroidogenesis in the vespertilionid bat, Scotophilus heathi: role of melatonin

100%
Abhilasha, Krishna A.
Acta Chiropterologica
|
1999
|
tom 01
|
nr 2
2

Asynchrony of the reproductive organs of the male vespertilionid bat, Scotophilus heathi: role of gonadotrophins

100%
Krishna A., Singh K.
Acta Theriologica
|
1999
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tom 44
|
nr 2
Changes in the LH-cells of the anterior pituitary in relation to the reproductive cycle in the male Scotophilus heathi (Horsfield, 1831) are described. Immunocyto- chemical studies of the pituitary suggested two annual peaks of LH accumulation and release each associated with a period of active spermatogenesis and testosterone secretion. Further, in vitro study showed differences in testicular responsiveness to LH stimulation during November (a period of active spermatogenesis) and December (winter dormancy). Present study further showed that FSH is also capable of stimu­lating androgen secretion from the testis. Testicular FSH responsiveness varies from recrudescence to winter dormancy and this may be responsible for maintaining high circulating androstenedione production in S. heathi during this period.
3

Year round plasma leptin and androgen concentrations in a tropical bat

80%
Singh U. P., Krishna A., Bhatnagar K. P.
Acta Theriologica
|
2007
|
tom 52
|
nr 2
The detailed reproductive patterns and their associated endocrine characteristics have been documented only for a few species of bats. The objective of this study was to examine seasonal changes in plasma concentrations of leptin and compare it with the changes in body mass, circulating concentrations of testosterone, androstenedione and its correlation with prolonged survival of sperm during winter dormancy in the male sheath-tailed batTaphozous longimanus Hardwicke, 1825. Six bats were captured every month for three consecutive years during 2002 to 2005 from Varanasi, a subtropical part of India. The changes in the body mass were positively correlated with circulating concentration of leptin. Leptin concentration reached a peak (14 ng/ml) in November coinciding with peak body mass. Leptin levels declined during other months of the year except for a rise in March and August. Plasma leptin was positively correlated with androstenedione concentration, but did not show significant correlation with testosterone level. We noticed a significant increase in testosterone secretionin vitro in response to leutinizing hormone (LH) stimulation. However, we did not notice any increase in testosterone or androstenedione secretionin vitro in response to leptin stimulation. Plasma leptin concentration did not show any correlation with testis mass in this study. The higher concentration of testosterone and androstenedione may be responsible for the prolonged survival of sperm in the epididymidies and higher levels of leptin in November may be responsible for maintaining reproductive function during winter dormancy. We suggest that inT. longimanus, higher leptin concentrations in November may be responsible for the gonadal recrudescence and reproductive response during winter dormancy is modified by energy availability and by changing leptin concentrations during this period.
4

The vespertilionid vomeronasal organ: an investigation on the VNO of Scotophilus (Chiroptera, Vespertilionidae)

71%
Bhatnagar K. P., Smith T. D., Krishna A., Singh U. P., Wible J. R.
Acta Chiropterologica
|
2001
|
tom 03
|
nr 1
Among adult bats, a vomeronasal organ (VNO) is known only for the New World families Phyllostomidae and Mormoopidae, and for the Old World vespertilionid subfamily Miniopterinae. However, Koike (1924) reported the presence of a well-developed VNO in embryos of Scotophilus kuhlii (= S. temmincki), a vespertilionid from Java of the subfamily Vespertilioninae. Given that a VNO has not been described for any other member of Vespertilioninae, we collected and serially sectioned adults and embryos of two species of Scotophilus (S. kuhlii and S. heathi) from Varanasi, India to check Koike's observation. A careful search revealed the complete absence of the VNO in the adults and embryos of both species. We conclude that the embryos described by Koike as having a well-developed VNO were attributed to S. kuhlii in error. The specimens described by Koike may have been confused with other bats from Java, whose adults and embryos are known to have a well-devel- oped VNO (i.e., the miniopterine Miniopterus schreibersii) or a rudimentary VNO, an epithelial tube without neuroepithelium (i.e., various rhinolophids).
5

Role of oxidative stress and low-grade inflammation in letrozole-induced polycystic ovary syndrome in the rat

61%
Pandey V., Singh A., Singh A., Krishna A., Pandey U., Tripathi Y. B.
Reproductive Biology
|
2016
|
tom 16
|
nr 1
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