Modulation of intestinal paracellular permeability by intracellular mediators and cytoskeleton.

Modulation of intestinal paracellular permeability by intracellular mediators and cytoskeleton.
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细胞内介质和细胞骨架对肠道细胞旁通透性的调节。

DOI:
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发表时间:
1997
影响因子:
2.1
通讯作者:
F. Ponz
F. Ponz
中科院分区:
医学4区
文献类型:
--
作者:
M. Pérez;A. Barber;F. Ponz

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细胞骨架抑制剂(细胞松弛素E和秋水仙碱)和细胞内介质(cAMP,Ca 2+,和蛋白激酶C)在控制细胞旁渗透甘露醇的影响进行了研究,在大鼠空肠中的Ussing型腔。细胞骨架抑制剂,细胞松弛素E(20 μ mol.L-1)或秋水仙碱(0.5 mmol.L-1),当存在于粘膜,serenum,或在这两种介质中,显着增加单向甘露醇流量。10 mmol·L ~(-1)茶碱或1 mmol·L ~(-1)环腺苷酸类似物使小肠粘膜和浆膜表面细胞内cAMP升高,可增强细胞旁通透性。在无Ca(2+)的生理介质中,被动渗透性强烈增加。Ca ~(2+)离子载体A23187(20 μ mol·L ~(-1))或0.3 mmol·L ~(-1)TMB-8(一种胞内Ca ~(2+)释放抑制剂)诱导的胞浆Ca ~(2+)水平的改变,增强甘露醇的通量。添加佛波酯12-O-十四烷酰基佛波醇-13-乙酸酯(可激活蛋白激酶C(PKC))也可诱导肠道对甘露醇的渗透性大幅增加。这些结果提供的证据表明,紧密连接,因此上皮细胞旁的渗透性可以生理控制的细胞内介质(Ca 2+,cAMP和PKC)可能通过调节细胞骨架的活动。
The influence of cytoskeletal inhibitors (cytochalasin E and colchicine) and intracellular mediators (cAMP, Ca2+, and protein kinase C) in the control of paracellular permeability to mannitol has been examined in rat jejunum in Ussing-type chambers. Cytoskeletal inhibitors, cytochalasin E (20 mumol.L-1) or colchicine (0.5 mmol.L-1), when present in mucosal, serosal, or in both mediums, significantly increase unidirectional mannitol fluxes. Exposure of mucosal and serosal intestinal surface to 10 mmol.L-1 theophylline or 1 mmol.L-1 cyclic AMP analogue for raising the intracellular cAMP enhances paracellular permeability. In Ca(2+)-free physiological medium passive permeability strongly increases. Alterations of cytosolic Ca2+ levels induced by the Ca2+ ionophore A23187 (20 mumol.L-1) or by 0.3 mmol.L-1 TMB-8, a Ca2+ releasing inhibitor from the intracellular stores, enhance mannitol flux. Addition of the phorbol ester 12-O-tetradecanoylphorbol-13-acetate, which activates protein kinase C (PKC), also induces a large increase in the intestinal permeability to mannitol. These results provide evidence that tight junctions and consequently epithelial paracellular permeability can be physiologically controlled by intracellular mediators (Ca2+, cAMP, and PKC) probably through modulation of the cytoskeleton activity.
肿瘤启动子对 LLC-PK1 肾上皮紧密连接和跨上皮通量的影响。
DOI: 10.1152/ajpcell.1986.251.4.c597
发表时间: 1986
期刊: The American journal of physiology
影响因子: --
作者:
Mullin,JM;O'Brien,TG
通讯作者: O'Brien,TG
蛋白激酶 C 对 Caco-2 细胞单层细胞旁通透性的调节。
DOI: 10.1152/ajpgi.1993.265.5.g955
发表时间: 1993
期刊: The American journal of physiology
影响因子: --
作者:
Stenson,WF;Easom,RA;Riehl,TE;Turk,J
通讯作者: Turk,J