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Results for “DIETHYLSTILBESTROL”

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PubMed1987

Diethylstilbestrol counteracts barbiturate narcosis and hypothermia in male mice.

Treatment with DES one hour prior to pentobarbital injection resulted in diminution of the narcotic sleep and hypothermia usually found after pentobarbital (50 mg/kg 1) injection in male mice. The effect was biphasic: significantly countered relative to saline pretreated controls at low (.001-.10 mg/kg 1) and at high (10-50 mg/kg -1) DES doses only. Giving DES alone did not change core body temperature compared to saline injected controls, at either 25 degrees C or at 33 degrees C. At 33 degrees C, neither PeB narcosis nor body temperature loss was significantly inhibited by DES. Possible cytoplasmic, nonsex differentiated bases for these estrogen effects on barbiturate action in the brain is discussed.

Animals↗
PubMed1986

Temporal effects of diethylstilbestrol administration in vivo on testosterone production in Leydig cells.

The temporal nature of estrogenic suppression of Leydig cell testosterone production was investigated. Adult rats were injected SC with 50 micrograms/100 g BW of DES or vehicle. Animals were sacrificed at 4, 8, or 12 h following a single injection or at 12 h following the latter of two daily injections for 1 or 2 days. Collagenase-dispersed interstitial cells were obtained, and population I and II Leydig cells were subsequently isolated on metrizamide gradients. Population I and II Leydig cells produced in vitro testosterone levels of 7.19 +/- 0.86 and 12.84 +/- 1.86 ng/10(6) cells/3 h, respectively. These levels were increased to 10- to 13-fold in the presence of hCG of dbcAMP. No significant difference was noted in the responsiveness of these two populations to the in vitro additions. DES administration in vivo for 8-48 h resulted in dramatic and significant decreases in basal and stimulated testosterone production in vitro in both populations. However, DES treatment for 4 h was relatively ineffective in blocking testosterone production in vitro. The inhibitory patterns exhibited by the two populations differed considerably. Population I displayed a uniform degree of inhibition throughout the treatment, whereas population II exhibited a more transient suppression by estrogen. Thus, population II appeared to be less sensitive to the estrogenic effects than population I at 48, 24, and 12 h of treatment. These data indicate that both population I and population II Leydig cells become sensitive to the inhibitory effects of estrogens between 4 and 8 h of in vivo treatment and suggest that certain differences exist between the two populations with respect to the temporal action of estrogens.

Animals↗