首页> 外文期刊>American Journal of Physiology >Rabbit conjunctival epithelium transports fluid, and P2Y2(2) receptor agonists stimulate Cl(-) and fluid secretion.
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Rabbit conjunctival epithelium transports fluid, and P2Y2(2) receptor agonists stimulate Cl(-) and fluid secretion.

机译:兔结膜上皮运输液体,P2Y2(2)受体激动剂刺激Cl(-)和液体分泌。

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摘要

Rabbit conjunctival epithelium exhibits UTP-dependent Cl(-) secretion into the tears. We investigated whether fluid secretion also takes place. Short-circuit current (I(sc)) was 14.9 +/- 1.4 microA/cm(2) (n = 16). Four P2Y(2) purinergic receptor agonists [UTP and the novel compounds INS365, INS306, and INS440 (Inspire Pharmaceuticals)] added apically (10 microM) resulted in temporary (approximately 30 min) I(sc) increases (88%, 66%, 57%, and 28%, respectively; n = 4 each). Importantly, the conjunctiva transported fluid from serosa to mucosa at a rate of 6.5 +/- 0.7 microl x h(-1) x cm(-2) (range 2.1--15.3, n = 20). Fluid transport was stimulated by mucosal additions of 10 microM: 1) UTP, from 7.4 +/- 2.3 to 10.7 +/- 3.3 microl x h(-1) x cm(-2), n = 5; and 2) INS365, from 6.3 +/- 1.0 to 9.8 +/- 2.5 microl. h(-1) x cm(-2), n = 5. Fluid transport was abolished by 1 mM ouabain (n = 5) and was drastically inhibited by 300 microM quinidine (from 6.4 +/- 1.2 to 3.6 +/- 1.0 microl x h(-1) x cm(-2), n = 4). We conclude that this epithelium secretes fluid actively and that P2Y(2) agonists stimulate both Cl(-) and fluid secretions.
机译:兔结膜上皮表现出UTP依赖的Cl(-)分泌到眼泪中。我们调查了是否还会发生液体分泌。短路电流(I(sc))为14.9 +/- 1.4 microA / cm(2)(n = 16)。顶端添加(10 microM)的四种P2Y(2)嘌呤能受体激动剂[UTP和新型化合物INS365,INS306和INS440(Inspire Pharmaceuticals)]导致I(sc)暂时性增加(大约30分钟)(88%,66%) ,分别为57%和28%; n = 4)。重要的是,结膜以6.5 +/- 0.7微升x h(-1)x cm(-2)的速度从浆膜向粘膜运输液体(范围2.1--15.3,n = 20)。黏膜添加10 microM刺激液体运输:1)UTP,从7.4 +/- 2.3到10.7 +/- 3.3 microl x h(-1)x cm(-2),n = 5;和2)INS365,从6.3 +/- 1.0到9.8 +/- 2.5微升。 h(-1)x cm(-2),n =5。1mM哇巴因(n = 5)消除了流体的输送,并被300 microM奎尼丁(从6.4 +/- 1.2到3.6 +/- 1.0微升xh(-1)x cm(-2),n = 4)。我们得出的结论是,该上皮细胞积极分泌液体,而P2Y(2)激动剂刺激Cl(-)和液体分泌。

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