Protein kinase C isoforms in bovine aortic endothelial cells: role in regulation of P2Y‐ and P2U‐purinoceptor‐stimulated prostacyclin release
Protein kinase C isoforms in bovine aortic endothelial cells: role in regulation of P2Y‐ and P2U‐purinoceptor‐stimulated prostacyclin release
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牛主动脉内皮细胞中的蛋白激酶 C 亚型:在调节 P2Y 和 P2U 嘌呤受体刺激的前列环素释放中的作用
DOI:
--
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发表时间:
1996
影响因子:
7.3
通讯作者:
M. Boarder
中科院分区:
文献类型:
--
作者:
V. Patel;C. Brown;M. Boarder
1 . Enhanced synthesis of prostacyclin (PGI2) and inositol polyphosphates in bovine aortic endothelial cells in response to ATP and ADP is mediated by co‐existing P2Y‐ and P2U‐purinoceptors. Here we examine the regulation of these responses by isoforms of protein kinase C (PKC). 2 . Immunoblots with antisera specific for 8 different PKC isoforms revealed the presence of α, ∍ and ζ, while no immunoreactivity was found for β, γ, δ, η and θ isoforms. PKC‐α was largely cytosolic in unstimulated cells and almost all translocated to the membrane (Triton X‐100 soluble) after a 1 min treatment with the PKC activating phorbol myristate acetate (PMA); PKC‐∍ was always in a Triton X‐100 insoluble membrane fraction, while PKC‐ζ was found in both soluble and membrane bound (Triton X‐100 soluble) forms in the unstimulated cells and was unaffected by PM A. 3 . Treatment with PM A for 6 h led to a 90% downregulation of PKC‐α, while the immunoreactivity to the e and ζ isoforms remained largely unchanged. 4 . After either 10 min or 6 h exposure to PM A the PGI2 response to activation of both receptors was enhanced, while the inositol 1,4,5‐trisphosphate response to P2Y‐purinoceptor activation was substantially attenuated and the P2U‐purinoceptor response was unchanged. Thus the PGI2 response to PM A under conditions when 90% of the PKC‐α was lost resembles that seen on acute stimulation of PKC by PMA, and the PGI2 response does not correlate with the phospholipase C response. 5 . Inhibition of PKC with the isoform non‐selective inhibitors, Ro 31–8220 and Go 6850 abolished the PGI2 response to both P2U‐ and P2Y‐purinoceptor stimulation. However, Go 6976, which preferentially inhibits Ca2+ sensitive isoforms (such as PKC‐α) and not Ca2+ insensitive isoforms (such as PKC‐∍), had no effect on the PGI2 response. 6 . The results show that there is a requirement for PKC in the stimulation of PGI2 production by endothelial P2Y‐ and P2U‐purinoceptors. Both downregulation and inhibition studies show that PKC‐α is not responsible for the regulation of the response to P2‐purinergic stimulation, and imply that the response is mediated by PKC‐∍ (PKC‐ζ is unresponsive to PMA), or an as yet uncharacterized PKC isoform.
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DOI:
10.1042/bj2840733
发表时间:
1992
期刊:
The Biochemical journal
影响因子:
--
作者:
Lustig,KD;Sportiello,MG;Erb,L;Weisman,GA
通讯作者:
Weisman,GA
DOI:
--
发表时间:
1994-06
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Michel Pucéat;R. Hilal-Dandan;B. Strulovici;L. Brunton;Joan Heller Brown
通讯作者:
Michel Pucéat;R. Hilal-Dandan;B. Strulovici;L. Brunton;Joan Heller Brown
DOI:
10.1073/pnas.84.11.3623
发表时间:
1987
影响因子:
11.1
作者:
Jelsema,CL;Axelrod,J
通讯作者:
Axelrod,J
DOI:
--
发表时间:
1987
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Martin,TW;Wysolmerski,RB
通讯作者:
Wysolmerski,RB
DOI:
--
发表时间:
1989
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Silk,ST;Clejan,S;Witkom,K
通讯作者:
Witkom,K