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Biosythesis of gonadotropins in vivo

100%
Kochman K., Gajewska A.
Acta Neurobiologiae Experimentalis
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1996
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vol. 56
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issue 3
753-756
EN
GnRh is potent stimulator of gonadotropin's alpha and beta chains synthesis in vivo.Stimulation of LH-beta gene transcription requires pulsatile GnRH administration but the transcription of alpha subunit can be stimulated independently of GnRH mode of administration.Castration increases whereas in vivo estradiol and testostrone replacement decreases the rate of gene transcription of pituitary gonadotropin subunits.Thyroid hormones can enhance or diminsh the pituitery levels of LH-beta and FSH-beta subunit mRNAs in female rats.Inhibin activin and follistatin were shown to be potent regulators of FSH-beta gene expression.
2

Gonadotropins and sex hormones modulate interrenal function in soft-shelled turtle

100%
Ray P. P., Maiti B. R.
Folia Biologica
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2002
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vol. 50
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issue 3-4
115-120
EN
The aim of the current work was to investigate the role of gonadotropins and female sex hormones on interrenal activity in soft-shelled turtles, Lissemys punctata punctata. 1) FSH treatment (3 mug/100 g body wt daily for 10 days) caused interrenal hypertrophy with increased nuclear diameter, raises of acid phosphatase and alkaline phosphatase concentrations, and depletions of cholesterol (except the free fraction) and ascorbic acid levels from the interrenal gland. However, LH treatment (3 mug/100 g body wt daily for 10 days) failed to produce any perceptible change in the interrenal activity. The combined treatments of FSH and LH (3 mug each/100 gm body wt daily for 10 days) produced no further change beyond that of FSH alone. 2) Estrogen treatment with the low dose (25 mug/100 g body wt daily for 10 days) had no effect, but with higher doses (50 mug or 100 mug/100 gm body wt daily for 10 days) is caused interrenal stimulation by inducing the same manifestations to those of FSH. The degree of manifestations was higher with the higher dose (100 mug daily) than that of the moderate dose (50 mug daily). Progesterone treatment with the low dose (25 mug / 100 g body wt daily for 10 days) had no significant effect, but with the moderate (50 mug daily) and higher (100 mug daily) doses suppressed interrenal activity by showing the reverse changes to those of estrogen. The degree of manifestations was higher with the higher dose than that of the moderate one. The combined treatments of estrogen and progesterone (100 mug each/100 g body wt daily for 10 days) caused interrenal stimulation but to a lesser extent than that of estrogen alone. The findings are briefly discussed.
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