葡萄糖对中华绒螯蟹(Eriocheir sinensis)眼柄CHH免疫阳性细胞ICa的影响

依据中华绒螯蟹正常血糖水平和摄食、饥饿条件下的血糖变动范围[(0.43±0.06)—(0.73±0.08)mmol/L],选择不同浓度葡萄糖,采用全细胞膜片钳技术,在单个细胞水平观察葡萄糖对中华绒螯蟹眼柄分泌CHH细胞高电压激活钙电流(ICa)的调控作用,探讨眼柄神经内分泌调控的生物物理机制。通过实时监测细胞膜电容的变化,观察去极化电压诱导的分泌CHH细胞ICa对细胞分泌的影响,发现ICa的大小与细胞的分泌强度呈明显的正相关;灌流正常中华绒螯蟹生理浓度的葡萄糖(0.3、0.9、1mmol/L)对细胞ICa无明显影响,高浓度葡萄糖(3、10mmol/L)灌流10—20min,对细胞ICa产生显著的抑制作用,但对细胞膜通道的激活、失活电压等电生理特征无明显的影响。这表明血糖水平通过抑制细胞ICa对中华绒螯蟹眼柄CHH神经多肽激素分泌活动产生快速的负反馈调节,以维持中华绒螯蟹的正常生理血糖水平。

EFFECTS OF GLUCOSE ON ICa DISSOLVED FROM CHH-IMMUNAREACTIVE CELLS IN EYESTALKS OF CRAB ERICHEIR SINENSIS

Chinese mitten crabs (Eriocheir sinensis) is one of the important economical valuable crustacean in China. Its X-organ-sinus gland (XO-SG) complex is an important neurosecretory organ analogous to vertebrate hypothalamo-neurohypophyseal system, from which some peptide hormones are produced, including crustacean hyperglycemia hormone (CHH), molt-inhibiting hormone (MIH), gonad-inhibiting hormone (GIH), and so on. These neuropeptides play a key role in regulating various important physiological processes, suc...