Cyclosporine-induced synthesis of endothelin by cultured human endothelial cells.

Cyclosporine-induced synthesis of endothelin by cultured human endothelial cells.
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环孢素诱导培养的人内皮细胞合成内皮素。

DOI:
--
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发表时间:
1991
影响因子:
15.9
通讯作者:
A. Brookshire
A. Brookshire
中科院分区:
医学1区
文献类型:
--
作者:
Timothy;E.;Bunchman;Craig;A. Brookshire

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内皮素(ET)是一种由内皮细胞(EC)合成的多肽,在动物体内输注时,可导致肾血流量和肾小球滤过率下降,平均动脉压升高。在组织培养中,ET通过钙通道拮抗剂抑制细胞外钙内流,引起血管平滑肌细胞(SMC)增殖和收缩。输注环孢素(CsA)的血流动力学与ET的作用类似,并知道CsA对EC的作用,我们推测CsA的血管收缩作用是EC合成ET的结果。不同浓度的CsA与EC孵育后,ET以剂量依赖的方式出现在上清液中,最高可达基础活性的75%以上。单独使用克霉酚或放线菌酮与CsA共同孵育时,EC上清液中的ET含量极低(P<0.01)。经CsA处理的EC条件培养液与SMC共同孵育后,其增殖活性高于基础活性的114%,而单独使用CsA则无此现象(P<0.01)。这种活性在存在抗ET抗体或非特异性存在钙通道拮抗剂(P<0.01)时被特异性地抑制。因此,CsA刺激内皮细胞合成ET,进而导致SMC增殖。这一作用可被ET特异性抗体或钙通道拮抗剂共同孵育所抑制。这些发现可能有助于了解CsA引起的高血压和血管病变。
Endothelin (ET), a peptide synthesized by endothelial cells (EC), causes a decreased renal blood flow and glomerular filtration rate and an increased mean arterial pressure when infused in animals. In tissue culture, ET causes smooth muscle cell (SMC) proliferation and contraction by influx of extracellular calcium, which is inhibited by calcium channel antagonists. Infusion of cyclosporine (CSA) hemodynamically parallels ET action, and knowing that CSA effects EC, we hypothesize that the vasoconstrictive effects of CSA are a result of ET synthesis by EC. Varying concentrations of CSA were incubated with EC resulting in ET present in the supernatants in a dose-dependent manner peaking at 75% above basal activity. Coincubation of either cremophor alone or cycloheximide with CSA resulted in minimal ET present in the EC supernatants (P less than 0.01 each). Incubation of conditioned media from CSA-treated EC with SMC caused proliferation at 114% above basal activity, which did not occur in the presence of CSA alone (P less than 0.01). This activity is specifically inhibited in the presence of an anti-ET antibody or nonspecifically in the presence of calcium channel antagonists (P less than 0.01 each). Therefore, CSA stimulates EC synthesis of ET which in turn causes SMC proliferation. This action is inhibited by the coincubation of a specific antibody to ET or a calcium channel antagonist. These findings may help in the understanding of CSA-induced hypertension and vasculopathy.
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影响因子: --
作者:
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发表时间: 1984-01-01
影响因子: 158.5
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DOI: 10.1038/ki.1985.196
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影响因子: 19.6
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