Calcium Influx Through AMPA Receptors and Through Calcium Channels Is Regulated by Protein Kinase C in Cultured Retina Amacrine‐Like Cells

Calcium Influx Through AMPA Receptors and Through Calcium Channels Is Regulated by Protein Kinase C in Cultured Retina Amacrine‐Like Cells
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在培养的视网膜无长突样细胞中,通过 AMPA 受体和钙通道的钙流入受到蛋白激酶 C 的调节

DOI:
10.1046/j.1471-4159.1998.70052112.x
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发表时间:
1998
影响因子:
4.7
通讯作者:
E. Pires
E. Pires
中科院分区:
医学2区
文献类型:
--
作者:
A. Carvalho;C. Duarte;Carlos J. Faro;A. Carvalho;E. Pires

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摘要:在富含视网膜无长突样细胞的培养物中研究了蛋白激酶 C (PKC) 对 α-氨基-3-羟基-5-甲基-4-异恶唑丙酸酯 (AMPA) 受体的功能调节。红藻氨酸引起的 [Ca2+]i 增加是由于 Ca2+ 通过开放的 AMPA 受体通道进入,因为它被 2,3-苯二氮卓 (LY 303070)(一种 AMPA 受体拮抗剂)的活性异构体阻断。 AMPA 受体对红藻氨酸的反应被佛波醇 12-肉豆蔻酸酯 13-乙酸酯增强,佛波醇 12-肉豆蔻酸酯 13-乙酸酯特异性刺激 PKC,而双吲哚基马来酰亚胺 I(PKC 的选择性抑制剂)以及 PKC 下调可降低 AMPA 受体对红藻氨酸的反应。结果表明,AMPA 受体激活不仅需要 PKC 要求,而且 PKC 通过 100 µM 红藻氨酸放大最大受体激活。还研究了 PKC 激活或抑制对电压门控 Ca2+ 通道活性的影响。 PKC 的激活导致 Ca2+ 通道的抑制,并且通过抑制 PKC 产生相同的效果,而佛波酯的无活性类似物不影响通道活性。我们的结果表明 PKC 在调节培养的视网膜细胞中 AMPA 受体和 Ca2+ 通道的功能中发挥着重要作用。
Abstract: The functional modulation of the α‐amino‐3‐hydroxy‐5‐methyl‐4‐isoxazolepropionate (AMPA) receptors by protein kinase C (PKC) was investigated in cultures enriched in retinal amacrine‐like cells. The kainate‐evoked [Ca2+]i increase is due to Ca2+ entry through open AMPA receptor channels, because it was blocked by the active isomer of a 2,3‐benzodiazepine (LY 303070), an AMPA receptor antagonist. The AMPA receptor response to kainate was potentiated by phorbol 12‐myristate 13‐acetate, which specifically stimulates PKC, and it was decreased by bisindolylmaleimide I, a selective inhibitor of PKC, as well as by PKC down‐regulation. The results indicate not only that the AMPA receptor activation has a PKC requirement, but also that PKC amplifies maximal receptor activation by 100 µM kainate. The effect of PKC activation or inhibition on voltage‐gated Ca2+‐channel activity was also investigated. Activation of PKC caused inhibition of Ca2+ channels, and the same effect was produced by inhibition of PKC, whereas the inactive analogue of the phorbol ester did not affect channel activity. Our results show an important role for PKC in regulating the function of both AMPA receptors and Ca2+ channels in cultured retina cells.
DOI: 10.1021/bi00131a002
发表时间: 1992-04-28
期刊: BIOCHEMISTRY
影响因子: 2.9
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发表时间: 1994-03
期刊: The Journal of Physiology
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DOI: --
发表时间: 1989
期刊: The Journal of pharmacology and experimental therapeutics
影响因子: --
作者:
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DOI: --
发表时间: 1994
期刊: The Journal of biological chemistry
影响因子: --
作者:
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DOI: 10.1016/0006-291x(86)90439-0
发表时间: 1986
影响因子: 3.1
作者:
Messing,RO;Carpenter,CL;Greenberg,DA
通讯作者: Greenberg,DA