首页> 外文期刊>American Journal of Physiology >Functional effects of protease-activated receptor-2 stimulation on human airway smooth muscle.
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Functional effects of protease-activated receptor-2 stimulation on human airway smooth muscle.

机译:蛋白酶激活受体2刺激对人气道平滑肌的功能作用。

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摘要

The protease-activated receptor (PAR)-2 is present on the smooth muscle and epithelium of human airways and can be activated by mast cell tryptase, trypsin, or the PAR-2 activating peptide (AP). Trypsin and the PAR-2 AP induced contractions in human isolated airways, and these contractions were potentiated in the presence of the cyclooxygenase (COX) inhibitor indomethacin. Trypsin also increased the contractions to histamine in airways from sensitized (allergic) patients but not from nonsensitized (nonallergic) patients. Tryptase purified from human lung, skin and lung recombinant beta-tryptases, trypsin, and the PAR-2 AP all increased DNA synthesis in human airway smooth muscle (HASM) cells. Activation of PAR-2 by tryptase, trypsin, and the PAR-2 AP did not induce PGE(2) release from HASM cells. Trypsin and the PAR-2 AP increased the levels of intracellular calcium in HASM cells, with desensitization evident after treatment with either agonist. In conclusion, activation of PAR-2 can induce contractions of human airways, potentiate contractions to histamine, and induce proliferation and therefore may contribute to airway diseases such as asthma.
机译:蛋白酶激活受体(PAR)-2存在于人气道的平滑肌和上皮中,​​可以被肥大细胞类胰蛋白酶,胰蛋白酶或PAR-2激活肽(AP)激活。胰蛋白酶和PAR-2 AP诱导人孤立气道收缩,并且在环氧合酶(COX)抑制剂吲哚美辛存在下增强这些收缩。胰蛋白酶还增加了敏化(过敏)患者气道对组胺的收缩,但不增加未敏化(非过敏)患者的组胺收缩。从人肺,皮肤和肺重组β-胰蛋白酶,胰蛋白酶和PAR-2 AP纯化的类胰蛋白酶均增加了人气道平滑肌(HASM)细胞中的DNA合成。胰蛋白酶,胰蛋白酶和PAR-2 AP激活PAR-2不会诱导HASM细胞释放PGE(2)。胰蛋白酶和PAR-2 AP增加了HASM细胞内细胞内钙的水平,用两种激动剂治疗后均出现脱敏现象。总之,PAR-2的激活可以诱导人的呼吸道收缩,增强组织胺的收缩,并诱导增殖,因此可能导致呼吸道疾病,例如哮喘。

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