Porcine granulosa cell desensitization: prolonged FSH-responsive cAMP production in vitro.

Porcine granulosa cell desensitization: prolonged FSH-responsive cAMP production in vitro.
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猪颗粒细胞脱敏:体外延长 FSH 反应性 cAMP 产生。

DOI:
10.1152/ajpendo.1983.244.5.e435
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发表时间:
1983
期刊:
The American journal of physiology
影响因子:
--
通讯作者:
Fisher,AE
Fisher,AE
中科院分区:
--
文献类型:
--
作者:
LaBarbera,AR;Fisher,AE

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猪卵巢小卵泡(1 ~ 2mm)颗粒细胞对促卵泡激素(FSH)产生cAMP;它们对人绒毛膜促性腺激素(hCG)或霍乱毒素的反应很少产生cAMP。通过放射免疫测定总cAMP(培养基+细胞)的定量估计,在缺乏或存在磷酸二酯酶抑制剂1-甲基-3-异丁基黄嘌呤(MIX)的情况下,细胞的产生似乎是偶发性的,并持续至少20小时。两次孵育实验的结果表明,在孵育之间彻底清洗细胞,细胞在先前暴露于同源刺激物后仍对FSH、hCG和霍乱毒素有反应。在没有刺激剂的情况下,细胞预孵育3小时,FSH反应性增强。在异种刺激剂的两种孵育实验中,首先,FSH预孵育增强了随后的hCG和霍乱毒素反应性;第二,hCG或霍乱毒素的预孵育不影响卵泡刺激素的反应。fsh激活的腺苷酸环化酶脱敏率从未超过35%;衰减程度取决于FSH浓度和暴露于FSH的时间。细胞在含有MIX和最大有效FSH浓度的培养基中浸润5小时,连续释放cAMP。综上所述,结果表明猪颗粒细胞在体外长时间暴露于卵泡刺激素后不会对卵泡刺激素无反应。
Granulosa cells from small (1-2 mm) follicles of porcine ovaries produced cAMP in response to follicle-stimulating hormone (FSH); they produced little cAMP in response to human chorionic gonadotropin (hCG) or to cholera toxin. Production, estimated by quantification of total cAMP (medium + cells) by radioimmunoassay, appeared to be episodic in the absence or presence of the phosphodiesterase inhibitor 1-methyl-3-isobutylxanthine (MIX) and continued for at least 20 h. Results of dual incubation experiments with thorough washing of cells between incubations indicated that cells remained responsive to FSH, to hCG, and to cholera toxin after prior exposure to homologous stimulator. Preincubation of cells for 3 h in the absence of stimulator enhanced FSH responsiveness. In experiments with heterologous stimulators in two incubations, first, preincubation with FSH enhanced subsequent hCG and cholera toxin responsiveness; and second, preincubation with hCG or cholera toxin did not affect FSH responsiveness. Desensitization of FSH-activated adenylate cyclase was never greater than 35%; the degree of attenuation was dependent on FSH concentration and duration of exposure to FSH. Cells perifused with medium containing MIX and a maximally effective concentration of FSH for 5 h released cAMP continuously. In summary, the results indicated that porcine granulosa cells do not become unresponsive to FSH after prolonged exposure to FSH in vitro.
激素、霍乱毒素和 N α-甲苯磺酰基-L-赖氨酸氯甲基酮对活颗粒细胞中腺苷酸环化酶的影响。
DOI: 10.1210/endo-111-6-1897
发表时间: 1982
期刊: Endocrinology
影响因子: 4.8
作者:
LaBarbera,AR;Bergert,ER;Ryan,RJ
通讯作者: Ryan,RJ
前列腺素 E 2 和黄体生成素对大鼠出生后发育和成熟过程中卵巢腺苷酸环化酶、蛋白激酶和鸟氨酸脱羧酶活性的作用。
DOI: --
发表时间: 1973
影响因子: 4
作者:
S. Lamprecht;U. Zor,;A. Tsafriri;H. R. Lindner
通讯作者: H. R. Lindner
DOI: --
发表时间: 1978
期刊: Endocrinology
影响因子: 4.8
作者:
R. Whitley;H. Keutmann;R. Ryan
通讯作者: R. Ryan
激素诱导的培养大鼠颗粒细胞对 FSH 的脱敏。
DOI: --
发表时间: 1980
期刊: Biochemical and Biophysical Research Communications - BBRC
影响因子: --
作者:
A. Nimrod;S. Lamprecht
通讯作者: S. Lamprecht
DOI: --
发表时间: 1973
期刊: Biochimica et Biophysica Acta
影响因子: --
作者:
J. M. Marsh;T. Mills;W. LeMaire
通讯作者: W. LeMaire