ACELL Mar. 45/3

نویسندگان

  • TERI J. KLEINE
  • GERALD J. GLEICH
  • Gerald J. Gleich
چکیده

Kleine, Teri J., Gerald J. Gleich, and Simon A. Lewis. Eosinophil peroxidase increases membrane permeability in mammalian urinary bladder epithelium. Am. J. Physiol. 276 (Cell Physiol. 45): C638–C647, 1999.—Eosinophil peroxidase (EPO), a cationic protein found in eosinophils, has been reported to be cytotoxic independent of its peroxidase activity. This study investigated with electrophysiological methods whether EPO is toxic to mammalian urinary bladder epithelium. Results indicate that EPO, when added to the mucosal solution, increases apical membrane conductance of urinary bladder epithelium only when the apical membrane potential is cell interior negative. The EPO-induced conductance was concentration dependent, with a maximum conductance of 411 μS/cm2 and a Michaelis-Menten constant of 113 nM. The EPO-induced conductance was nonselective for K1 and Cl2. The conductance was partially reversed using voltage but not by removal of EPO from the bulk solution. Mucosal Ca21 reversed the EPO-induced conductance by a mechanism involving reversible block of the conductance. Prolonged exposure (up to 1 h) to EPO was toxic to the urinary bladder epithelium, as indicated by an irreversible increase in transepithelial conductance. These results suggest that EPO is indeed toxic to urinary bladder epithelium via a mechanism that involves an increase in membrane permeability.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

ACELL Mar. 45/3

MARK O. BEVENSEE,1 ESTHER BASHI,1 WOLF-RÜDIGER SCHLUE,2 GREGORY BOYARSKY,3 AND WALTER F. BORON1 1Department of Cellular and Molecular Physiology, Yale University School of Medicine, New Haven, Connecticut 06520; 2Institut für Neurobiologie, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany; and 3Department of Physiology and Biophysics, University of Texas Medical Branch, Galvesto...

متن کامل

ACELL Mar. 45/3

AKI YAMADA,1 SUSUMU OHYA,2 MASARU HIRANO,2 MINORU WATANABE,2 MICHAEL P. WALSH,3 AND YUJI IMAIZUMI1 1Department of Pharmacology and Therapeutics and 2Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Nagoya City University, Nagoya 467-8603, Japan; and 3Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Calgary, Calgary, Alberta T2N 4N1, Ca...

متن کامل

ACELL Mar. 45/3

Farge, Emmanuel, David M. Ojcius, Agathe Subtil, and Alice Dautry-Varsat. Enhancement of endocytosis due to aminophospholipid transport across the plasma membrane of living cells. Am. J. Physiol. 276 (Cell Physiol. 45): C725– C733, 1999.—Formation of intracellular vesicles is initiated by membrane budding. Here we test the hypothesis that the plasma membrane surface area asymmetry could be a dr...

متن کامل

ACELL Mar. 45/3

Amemiya, Morimasa, Kaoru Tabei, Eiji Kusano, Yasushi Asano, and Robert J. Alpern. Incubation of OKP cells in low-K1 media increases NHE3 activity after early decrease in intracellular pH. Am. J. Physiol. 276 (Cell Physiol. 45): C711–C716, 1999.—Chronic hypokalemia increases the activity of proximal tubule apical membrane Na1/H1 antiporter NHE3. The present study examined the effect of the incub...

متن کامل

ACELL Mar. 45/3

Maréchal, Hervé, Hélene Jammes, Bernard Rossignol, and Philippe Mauduit. EGF precursor mRNA and membrane-associated EGF precursor protein in rat exorbital lacrimal gland. Am. J. Physiol. 276 (Cell Physiol. 45): C734– C746, 1999.—This study was designed to demonstrate the presence of epidermal growth factor (EGF) in the rat exorbital lacrimal gland. EGF precursor gene transcription was demonstra...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 1999