Abstract
Follicular cells obtained by collagenase dispersion of turtle ( Chrysemys picta) ovarian tissue at three different times of the year (summer, stage 1; fall, stage 2; spring, stage 3) were examined for steroid (progesterone, testosterone, estradiol) secretion in response to increasing concentrations of ovine FSH and LH. At all three stages of the cycle FSH stimulated steroid production. Although both progesterone and testosterone were secreted by cells obtained from ovaries at stages 1 and 2 of the cycle, estradiol could not be detected in incubations of cells at these times. However, at stage 3 of the cycle, a stimulatory effect of FSH on estradiol production was apparent. The slight stimulatory effect of high doses of LH on progesterone and testosterone production may be due to FSH contamination in this particular NIH preparation. Turtle luteal cells prepared by the same method secreted progesterone in response to dibutyryl cyclic AMP.
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