NDLI: Ca++ regulation of paracellular permeability in the middle intestine of the eel, Anguilla anguilla

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Journal of Comparative Physiology B : Volume 171, Issue 1, February 2001

Journal of Comparative Physiology B : Volume 170

Journal of Comparative Physiology B : Volume 169

Journal of Comparative Physiology B : Volume 168

Journal of Comparative Physiology B : Volume 167

Ca++ regulation of paracellular permeability in the middle intestine of the eel, Anguilla anguilla

Content Provider	Springer Nature Link
Author	Trischitta, F. Denaro, M.G. Faggio, C. Lionetto, M.G.
Copyright Year	2001
Abstract	The role of Ca++ on the regulation of the paracellular pathway permeability of the middle intestine of Anguilla anguilla was studied by measuring the transepithelial resistance and the dilution potential, generated when one half of NaCl in the mucosal solution was substituted iso-osmotically with mannitol, in various experimental conditions altering extracellular and/or intracellular calcium levels. We found that removal of Ca++ in the presence of ethylene glycol-bis(β-aminoethyl ether) (EGTA) from both the mucosal and the serosal side, but not from one side only, reduced both the transepithelial resistance and the magnitude of the dilution potential. The irreversibility of this effect suggests a destruction of the organization of the junction in the nominal absence of Ca++. However a modulatory role of extracellular Ca++ cannot be excluded. The decrease of the intracellular Ca++ activity, produced by using verapamil to block the Ca++ entry into the cell, or by adding 3,4,5-trimethoxybenzoic acid 8-(diethylamino) octyl ester (hydrochloride) (TMB-8), an inhibitor of Ca++ release from the intracellular stores, reduced both the transepithelial resistance and the magnitude of the dilution potential, indicating a role of cytosolic Ca++ in the modulation of the paracellular permeability. However the rise of calcium activity produced by the Ca++ ionophore calcimycin (A23187) evoked an identical effect, suggesting that any change in physiological intracellular Ca++ activity alters the paracellular permeability.
Starting Page	85
Ending Page	90
Page Count	6
File Format	PDF
ISSN	01741578
Journal	Journal of Comparative Physiology B
Volume Number	171
Issue Number	2
e-ISSN	1432136X
Language	English
Publisher	Springer-Verlag
Publisher Date	2001-01-18
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Physiology Biochemistry Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Endocrinology

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