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A Rapid Bioassay for Measuring Inhibin Activity

Ramasharma, K and Shashidaramurthy, HM and Moudgal, NR (1979) A Rapid Bioassay for Measuring Inhibin Activity. In: Biology of Reproduction, 20 (4). pp. 831-835.

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A sensitive and rapid bioassay of inhibin is described. Swiss albino female mice, 27 days old, weighing 25-30 g, were primed with 20 IU hCG, given in 2 equal doses, administered at 0900 h and 1800 h. An increment of 200% in uterine weight could be observed when the animals were autopsied the next day at 1000 h. The validity of the endpoint chosen, as a function dependent on FSH, was shown by the fact that neutralization of endogenous FSH by FSH antiserum led to an inhibition of uterine weight increase. Further injection of the inhibin material caused an actual reduction in the heightened levels of FSH (ng/ml) brought about by hCG: Control, 207 ± 13.6; hCG, 365 ± 28.8 and hCG inhibin, below the detection level of radioimmunoassay. Inhibin preparation from ovine testicular extract when tested at 3 dose levels showed a dose dependent and significant suppression in uterine weight increase. The assay was statistically validε = 2.5; slope = 23.9; λ = 0.104 and intra- and interassay variation = 8.3% and 11.7%, respectively. Since the mouse uterine weight assay is specific, has greater sensitivity and is uniformly reproducible, it is suggested that this assay procedure is ideally suited to assess the activity of different inhibin test preparations as well as to follow the purification of inhibin activity from crude material.

Item Type: Journal Article
Publication: Biology of Reproduction
Publisher: Society for the Study of Reproduction
Additional Information: Copyright of this article belongs to Society for the Study of Reproduction.
Department/Centre: Division of Biological Sciences > Biochemistry
Date Deposited: 01 Dec 2010 09:52
Last Modified: 25 Oct 2018 10:13
URI: http://eprints.iisc.ac.in/id/eprint/34175

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