摘要
目的 探讨垂体腺苷酸环化酶激活肽 38(PACAP 38)稳定海马神经元细胞内钙离子浓度([Ca2 + ]i)作用的可能机理。方法 取新生SD大鼠海马 ,用B2 7无血清培养基培养神经元 ;经Fura 2 /AM标记后 ,共聚焦显微镜下测定 [Ca2 + ]i。结果PACAP 38(10pmol·L- 1)能抑制谷氨酸 (5 0 0 μmol·L- 1)所致海马神经元 [Ca2 + ]i 升高 ,而Rp型硫化环腺苷酸 (2 0 μmol·L- 1)或氯化白屈菜赤碱 (0 .1μmol·L- 1)能阻断PACAP 38的抑制作用。二丁基环腺苷酸 (0 .1~ 10 0 μmol·L- 1)和豆寇酰佛波醇乙酯(0 .0 1~ 10 μmol·L- 1)也能抑制谷氨酸引起的海马神经元 [Ca2 + ]i 升高。结论 PACAP 38减轻谷氨酸引起的海马神经元 [Ca2 + ]i
AIM To investigate the possible mechanism of pituitary adenylate cyclase activating polypeptide-38 (PACAP-38) stabilizing calcium homeostasis in cultured hippocampal neurons. METHODS Hippocampus was isolated from newborn SD rats and dispersedly cultured in the B27 medium. Intracellular calcium concentration ( i) was determined with the confocal microscope after hippocampal neurons were labeled by Fura-2/AM. RESULTS PACAP-38(10 pmol·L -1)inhibited the increase in i induced by glutamate(500 μmol·L -1) in cultured hippocampal neurons, and the inhibitory effect of PACAP-38 was attenuated by adenosine 3′,5′-cyclic monophosphothioate, Rp-isomer (RpcAMPS, 20 μmol·L -1) and chelerythrine chloride (0.1 μmol·L -1). N 6,2′-O-Dibutyryladenosine 3′∶5′-cyclic monophosphate (dbcAMP, 0.1-100 μmol·L -1) and phorbol 12-myristate 13-acetate (0.01-10 μmol·L -1) reduced the increase in i induced by glutamate. CONCLUSION PACAP-38 attenuates the increase in i induced by glutamate in cultured hippocampal neurons, which may be mediated by protein kinase A and protein kinase C signal transduction system.
出处
《中国药理学与毒理学杂志》
CAS
CSCD
北大核心
2002年第4期261-264,共4页
Chinese Journal of Pharmacology and Toxicology
关键词
垂体腺苷酸环化酶激活肽
谷氨酸
大鼠
海马
神经元细胞
钙离子
pituitary adenylate cyclase activating polypeptide
hippocampus
neurons
glutamates
calcium,cytosolic