Modulation of intestinal paracellular permeability by intracellular mediators and cytoskeleton.
Modulation of intestinal paracellular permeability by intracellular mediators and cytoskeleton.
复制标题
细胞内介质和细胞骨架对肠道细胞旁通透性的调节。
DOI:
--
复制
发表时间:
1997
影响因子:
2.1
通讯作者:
F. Ponz
中科院分区:
文献类型:
--
作者:
M. Pérez;A. Barber;F. Ponz
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.
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
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