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Asymmetric effects of H2O2 on alveolar epithelial barrier properties.
Am J Physiol. 1993 Mar; 264(3 Pt 1):L308-15.AJ

Abstract

The effects of H2O2 on active ion transport and resistance to passive solute flow were studied utilizing rat alveolar epithelial cell monolayers cultured on permeable supports. Type II alveolar epithelial cells were plated onto tissue culture-treated polycarbonate membrane filters. The resulting confluent monolayers on days 3 and 4 were mounted in a modified Ussing chamber and bathed on both sides with N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid-buffered Ringer solution. These monolayers have a high transepithelial resistance (> 2,000 omega.cm2) and actively transport Na+ from apical fluid. H2O2 (0-100 mM) was then delivered to either apical or basolateral fluid. The changes in short-circuit current (Isc) and monolayer resistance (R) in response to the exogenous hydroperoxide were measured. To determine the degree of cellular catalase participation in protection against H2O2 injury to the barrier, experiments were repeated in the presence of 20 mM aminotriazole (ATAZ; an inhibitor of catalase) in the same bathing fluid as the hydroperoxide. Results indicated that H2O2 decreased Isc and R gradually in a dose-dependent manner. The effective concentration of apical H2O2 at which Isc (or R) was decreased by 50% at 1 h (ED50) was approximately 4 mM. However, basolateral H2O2 exposure led to ED50 for Isc (and R) of approximately 0.04 mM. Inhibition of cellular catalase yielded ED50 for Isc (and R) of approximately 0.4 mM when H2O2 was given apically, while ED50 for basolateral exposure to H2O2 did not change in the presence of ATAZ. The rate of H2O2 consumption in apical and basolateral bathing fluids was the same, while cellular catalase activity rose gradually with time in culture.(

ABSTRACT

TRUNCATED AT 250 WORDS)

Authors+Show Affiliations

Department of Medicine, School of Medicine, University of Southern California, Los Angeles 90033.No affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, P.H.S.

Language

eng

PubMed ID

8460719

Citation

Kim, K J., and D J. Suh. "Asymmetric Effects of H2O2 On Alveolar Epithelial Barrier Properties." The American Journal of Physiology, vol. 264, no. 3 Pt 1, 1993, pp. L308-15.
Kim KJ, Suh DJ. Asymmetric effects of H2O2 on alveolar epithelial barrier properties. Am J Physiol. 1993;264(3 Pt 1):L308-15.
Kim, K. J., & Suh, D. J. (1993). Asymmetric effects of H2O2 on alveolar epithelial barrier properties. The American Journal of Physiology, 264(3 Pt 1), L308-15.
Kim KJ, Suh DJ. Asymmetric Effects of H2O2 On Alveolar Epithelial Barrier Properties. Am J Physiol. 1993;264(3 Pt 1):L308-15. PubMed PMID: 8460719.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Asymmetric effects of H2O2 on alveolar epithelial barrier properties. AU - Kim,K J, AU - Suh,D J, PY - 1993/3/1/pubmed PY - 1993/3/1/medline PY - 1993/3/1/entrez SP - L308 EP - 15 JF - The American journal of physiology JO - Am. J. Physiol. VL - 264 IS - 3 Pt 1 N2 - The effects of H2O2 on active ion transport and resistance to passive solute flow were studied utilizing rat alveolar epithelial cell monolayers cultured on permeable supports. Type II alveolar epithelial cells were plated onto tissue culture-treated polycarbonate membrane filters. The resulting confluent monolayers on days 3 and 4 were mounted in a modified Ussing chamber and bathed on both sides with N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid-buffered Ringer solution. These monolayers have a high transepithelial resistance (> 2,000 omega.cm2) and actively transport Na+ from apical fluid. H2O2 (0-100 mM) was then delivered to either apical or basolateral fluid. The changes in short-circuit current (Isc) and monolayer resistance (R) in response to the exogenous hydroperoxide were measured. To determine the degree of cellular catalase participation in protection against H2O2 injury to the barrier, experiments were repeated in the presence of 20 mM aminotriazole (ATAZ; an inhibitor of catalase) in the same bathing fluid as the hydroperoxide. Results indicated that H2O2 decreased Isc and R gradually in a dose-dependent manner. The effective concentration of apical H2O2 at which Isc (or R) was decreased by 50% at 1 h (ED50) was approximately 4 mM. However, basolateral H2O2 exposure led to ED50 for Isc (and R) of approximately 0.04 mM. Inhibition of cellular catalase yielded ED50 for Isc (and R) of approximately 0.4 mM when H2O2 was given apically, while ED50 for basolateral exposure to H2O2 did not change in the presence of ATAZ. The rate of H2O2 consumption in apical and basolateral bathing fluids was the same, while cellular catalase activity rose gradually with time in culture.(ABSTRACT TRUNCATED AT 250 WORDS) SN - 0002-9513 UR - https://www.unboundmedicine.com/medline/citation/8460719/Asymmetric_effects_of_H2O2_on_alveolar_epithelial_barrier_properties_ L2 - http://journals.physiology.org/doi/full/10.1152/ajplung.1993.264.3.L308?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -