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Experiments were carried out with two highly purified preparations of human follicle-stimulating hormone (FSH), of pituitary and urinary origin. The uptake of [³H]thymidine was used to measure the response of cultured infantile mouse ovaries. The activity of the pituitary FSH did not decline during 7 days' incubation in the standard culture conditions, nor was it reduced by the culture of infantile mouse ovaries in it. It did not stimulate increased thymidine uptake during the 1st day of culture. Thereafter the rate of thymidine uptake per ovary in response to pituitary FSH remained constant until the end of the 4-day culture period. The urinary FSH became progressively less effective after the 2nd day of incubation. The two preparations gave highly significant linear log dose—response curves in the range 0·01 to 0·64 i.u./ml. The results are discussed in relation to the mode of action of FSH.

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				M. P. Rose, R. E. Gaines Das, and A. H. Balen Definition and Measurement of Follicle Stimulating Hormone Endocr. Rev., February 1, 2000; 21(1): 5 - 22. [Abstract] [Full Text]