Articles written in Journal of Biosciences
Volume 7 Issue 2 March 1985 pp 115-122
Acetone powder preparations of ventral prostates of adult albino rat exhibit an inhibin-like activity.
Volume 10 Issue 3 September 1986 pp 413-422
A technique is described for obtaining a Sertoli cell-enriched and a germ cell-enriched fraction from immature rat testes. Sertoli cell-germ cell associations were obtained by incubating washed seminiferous tubule fragments with Collagenase and Pancreatin. They were then manually dissociated into a suspension comprising Sertoli cells as well as the various germ cell types characteristic for a given day of ontogeny. Fractionation into a Sertoli cell-enriched fraction and a germ cell-enriched fraction was effected by centrifugation following layering over a stepwise gradient of Ficoll-400. While the time-span compares favourably with other procedures reported in the literature, it is believed this is the first time a method is described that enables the simultaneous recovery of both the Sertoli cells and the germ cells.
Volume 12 Issue 4 December 1987 pp 359-365
The bull seminal plasma peptides α and
Volume 14 Issue 2 June 1989 pp 69-78
Castration had no effect on prostatic inhibin-like activity as compared to normal controls. Consequent upon castration there is a significant reduction in the inhibin content of the ventral prostate on a per gland basis. However, when expressed as a function of protein content, there is no change. The data suggest that the very same epithelial cells which under the influence of androgen carry out the characteristic exocrine secretory activity are responsible for the synthesis and secretion of inhibin-like material.
Volume 14 Issue 2 June 1989 pp 79-90
Studies on the characterization of inhibin and inhibin-like factors have depended for the most part on the classical
Volume 18 Issue 1 March 1993 pp 59-72
In adult rats, removal of one ovary leads to an acute albeit transient rise in serum follicle stimulating hormone and an increase in the weight of the remaining ovary. In an attempt to correlate the high titre of endogenous follicle stimulating hormone with the changes taking place at the macromolecular level, the phenomenon of compensatory ovarian hypertrophy was studied for one cycle after hemiovariectomy at metoestrus in the adult, cycling female rats derived from the Holtzman strain. The significant finding with respect to hormonal changes was an acute follicle stimulating hormone surge commencing 6h post-unilateral ovariectomy, reaching a maximum at 12 h and declining thereafter, hitherto not reported in the Holtzman strain. Serum luteinizing hormone, prolactin, oestradiol-17β and testosterone remained unaltered while progesterone showed a decline at 6 h after surgery. There was an increase in the number of healthy class III (> 350 µm) follicles with a concomitant drop in atretic class III follicles 24 h post-unilateral ovariectomy. Analysis for DNA, RNA and protein content showed that all three constituents registered a continuous rise in the hypertrophying ovary up to 120h after surgery. When expressed as ¼g/mg ovarian weight, the increase in DNA reached a maximum at 24 h and declined thereafter. The kinetics of DNA synthesis was followed by pulse labelling with [3H] thymidine at 18, 24, 36 and 48 h after unilateral ovariectomy. Maximum incorporation occurred at 36 h. Autoradiographic studies showed that the granulosa cells of healthy follicles preferentially incorporated the label. In an extension of this study, it was found that labelling index registered a significant increase following ovariectomy, the maximum being reached at 24 h especially in class