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林信伟, 李英文, 林浩然. 细胞外Ca++对脉冲式和持续性鲑GnRH类似物刺激鲤GtH分泌的影响[J]. 水生生物学报, 1995, 19(3): 203-209.
引用本文: 林信伟, 李英文, 林浩然. 细胞外Ca++对脉冲式和持续性鲑GnRH类似物刺激鲤GtH分泌的影响[J]. 水生生物学报, 1995, 19(3): 203-209.
Lin Xinwei, Li Yingwen, Lin Haoran. EFFECTS OF EXTRACELLULAR CALCIUM ON THE GTH RELEASE IN COMMON CARP, CYPRINUS CARPIO, INDUCED BY PULSATILE AND CONTINUOUS ADMINISTRATION OF SLMON GnRH AGONIST[J]. ACTA HYDROBIOLOGICA SINICA, 1995, 19(3): 203-209.
Citation: Lin Xinwei, Li Yingwen, Lin Haoran. EFFECTS OF EXTRACELLULAR CALCIUM ON THE GTH RELEASE IN COMMON CARP, CYPRINUS CARPIO, INDUCED BY PULSATILE AND CONTINUOUS ADMINISTRATION OF SLMON GnRH AGONIST[J]. ACTA HYDROBIOLOGICA SINICA, 1995, 19(3): 203-209.

细胞外Ca++对脉冲式和持续性鲑GnRH类似物刺激鲤GtH分泌的影响

EFFECTS OF EXTRACELLULAR CALCIUM ON THE GTH RELEASE IN COMMON CARP, CYPRINUS CARPIO, INDUCED BY PULSATILE AND CONTINUOUS ADMINISTRATION OF SLMON GnRH AGONIST

  • 摘要: 2min脉冲式10nmol鲑GnRH高效类似物sGnRH-A(Arg6Trp7Leu8pro9NEt-LHRH)刺激导致离体灌流培育的鲤脑垂体迅速产生显着的GtH分泌峰,GtH分泌在刺激后30min内恢复到基础水平.4h10nmol/LsGnRH-A持续性刺激导致灌流培育的鲤脑垂体GtH分泌出现脱敏反应,整个过程包括刺激后迅速的GtH分泌峰相和随后持续低水平的GtH分泌相.无Ca++的灌流液或用EGTA赘合了灌流液中的Ca++对灌流培育的鲤脑垂体基础GtH分泌没有影响,但导致胞垂体对2min 10nmol/LsGnRH-A刺激的GtH分泌反应显着降低以及脑垂体对持续性10nmol/LsGnRH-A刺激的GtH分泌的脱敏反应消失,而仅出现低水平的GtH分泌反应.

     

    Abstract: Two-min pulse of 10nmol/L sGnRH-A(Arg6Trp7Leu8pro9NEt-LHRH)stimulated a rapid and significant release of GtH from perifused pituitary fragments ofcommon carp.The GtH level then decreased and to its basal level within 30-minafter the introduction of the sGnRH-Apulse. The continuous exposure of perifusedpituitary fragments to 10nmol/L sGnRH-A for 4hrs resulted in desensitization in-cluding two phases:an initial pcak phase of GtH release and a followed lowerlevel phase of GtH release. The perifusion of the pituitary fragments with Ca++freeHanks salt solution or the salt solution containing EGTA(1.25 and 5mmol/L)didnot influence the basal GtH release,but resulted in a significant decrease in GtHrelease if stimulated by 2-min pulses of 10nmol/L sGnRH-A and in disappearance ofdesensitization of GtH release which is induced by continuous administration ofof 10nmol/L sGnRH-A.

     

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