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Protective effects of the lazaroid U-74389G against hyperoxia in rat type II pneumocytes.
Pulm Pharmacol Ther. 1998 Feb; 11(1):23-30.PP

Abstract

The aims of this study were to investigate the effect of hyperoxia on O2(-.), H2O2 and .NO generation and iNOS mRNA levels in rat type II pneumocytes in vitro and the possible protective effect of the lazaroid U-74389G. Rat type II pneumocytes were exposed, 36 h after isolation, to air, 60% or 85% O2 for 48 h. At the beginning of the experiment and 24 h later, the cells were exposed for 30 min to either 30 microM U-74389G or only the vehicle for the lazaroid (control). Exposure to 60% and 85% O2 decreased nitrite production 2.9-fold and 3.9-fold, and increased O2(-.) and H2O2 generation 4.6-fold and 6.7-fold, respectively. In the 85% O2-exposed cells, hyperoxia increased lipid peroxidation (thiobarbituric acid reactive substances, TBARS production) 2-fold and iNOS mRNA production 5.4-fold. U-74389G prevented the decrease in nitrite and the rise in O2(-.) and H2O2 production, the increase in TBARS and the rise in iNOS mRNA after hyperoxia. We conclude that exposure of type II pneumocytes in vitro to subtoxic oxygen levels leads to a disturbance in the .NO-O2(-.) balance despite increased iNOS mRNA levels. The lazaroid U-74389G appears to be a useful compound in the protection of hyperoxic lung injury by restoration of this .NO-O2(-.) balance and prevention of TBARS formation.

Authors+Show Affiliations

Laboratory of Pneumology, Unit of Lung Toxicology, K.U. Leuven, Herestraat 49, B-3000 Leuven, Belgium.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

9802960

Citation

van Klaveren, R J., et al. "Protective Effects of the Lazaroid U-74389G Against Hyperoxia in Rat Type II Pneumocytes." Pulmonary Pharmacology & Therapeutics, vol. 11, no. 1, 1998, pp. 23-30.
van Klaveren RJ, Roelant C, Boogaerts M, et al. Protective effects of the lazaroid U-74389G against hyperoxia in rat type II pneumocytes. Pulm Pharmacol Ther. 1998;11(1):23-30.
van Klaveren, R. J., Roelant, C., Boogaerts, M., Pype, J. L., Demedts, M., & Nemery, B. (1998). Protective effects of the lazaroid U-74389G against hyperoxia in rat type II pneumocytes. Pulmonary Pharmacology & Therapeutics, 11(1), 23-30.
van Klaveren RJ, et al. Protective Effects of the Lazaroid U-74389G Against Hyperoxia in Rat Type II Pneumocytes. Pulm Pharmacol Ther. 1998;11(1):23-30. PubMed PMID: 9802960.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Protective effects of the lazaroid U-74389G against hyperoxia in rat type II pneumocytes. AU - van Klaveren,R J, AU - Roelant,C, AU - Boogaerts,M, AU - Pype,J L, AU - Demedts,M, AU - Nemery,B, PY - 1998/11/6/pubmed PY - 1998/11/6/medline PY - 1998/11/6/entrez SP - 23 EP - 30 JF - Pulmonary pharmacology & therapeutics JO - Pulm Pharmacol Ther VL - 11 IS - 1 N2 - The aims of this study were to investigate the effect of hyperoxia on O2(-.), H2O2 and .NO generation and iNOS mRNA levels in rat type II pneumocytes in vitro and the possible protective effect of the lazaroid U-74389G. Rat type II pneumocytes were exposed, 36 h after isolation, to air, 60% or 85% O2 for 48 h. At the beginning of the experiment and 24 h later, the cells were exposed for 30 min to either 30 microM U-74389G or only the vehicle for the lazaroid (control). Exposure to 60% and 85% O2 decreased nitrite production 2.9-fold and 3.9-fold, and increased O2(-.) and H2O2 generation 4.6-fold and 6.7-fold, respectively. In the 85% O2-exposed cells, hyperoxia increased lipid peroxidation (thiobarbituric acid reactive substances, TBARS production) 2-fold and iNOS mRNA production 5.4-fold. U-74389G prevented the decrease in nitrite and the rise in O2(-.) and H2O2 production, the increase in TBARS and the rise in iNOS mRNA after hyperoxia. We conclude that exposure of type II pneumocytes in vitro to subtoxic oxygen levels leads to a disturbance in the .NO-O2(-.) balance despite increased iNOS mRNA levels. The lazaroid U-74389G appears to be a useful compound in the protection of hyperoxic lung injury by restoration of this .NO-O2(-.) balance and prevention of TBARS formation. SN - 1094-5539 UR - https://www.unboundmedicine.com/medline/citation/9802960/Protective_effects_of_the_lazaroid_U_74389G_against_hyperoxia_in_rat_type_II_pneumocytes_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1094-5539(98)90114-6 DB - PRIME DP - Unbound Medicine ER -