Attenuation of hyperoxic lung injury by the 21-aminosteroid U-74389G

S. Tasaka, A. Ishizaka, T. Urano, K. Sayama, F. Sakamaki, H. Nakamura, T. Terashima, Y. Waki, K. Soejima, S. Fujishima, M. Kanazawa

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Abstract

Hyperoxic lung injury is attributable to oxygen radicals produced under hyperoxic conditions. The 21-aminosteroid (AS), U-74389G, is a potent antioxidant. We examined the effect of U-74389G on lung injury in guinea pigs during exposure to 90% O2 for 48 h. We injected either vehicle or 10 mg/kg of U-74389G 30 min before the O2 exposure and injected the same dose 12, 24, and 36 h later. We performed two series of experiments after exposure. In the first series, we measured the clearance rate of (99m)Tc-labeled dialdehyde starch (DAS) from the lungs as an index of pulmonary epithelial damage in three experimental groups consisting of 1) control (n = 6), 2) O2 alone (n = 6), and 3) O2 + AS (n = 6). In the second series, pulmonary endothelial injury was estimated by using 28 guinea pigs divided into four experimental groups consisting of 1) control (n = 8), 2) AS alone (n = 5), 3) O2 alone (n = 6), and 4) O2 + AS (n = 9). In the second series, we measured the wet-to- dry weight ratio (W/D) as an index of lung water and the concentration ratio of 125I-labeled albumin in lung tissue and bronchoalveolar lavage (BAL) fluid compared with plasma (T/P and BAL/P, respectively) as indexes of pulmonary endothelial damage. Cell accumulation in BAL fluid and lung tissue samples was also assessed in the second series. In the O2 alone group, W/D, T/P, BAL/P, and DAS clearance rate were all increased compared with the control group (P < 0.05). The increases in W/D, BAL/P, and DAS clearance rate were attenuated by U-74389G treatment. Cell accumulation in the O2 alone group was also attenuated by U-74389G treatment. In conclusion, this study suggests that U-74389G attenuates lung injury induced by hyperoxic exposure.

Original languageEnglish
Pages (from-to)1635-1641
Number of pages7
JournalJournal of Applied Physiology
Volume78
Issue number5
DOIs
Publication statusPublished - 1995 Jan 1

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Keywords

  • endothelium
  • epithelium
  • hyperoxia
  • lung water

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

Cite this

Tasaka, S., Ishizaka, A., Urano, T., Sayama, K., Sakamaki, F., Nakamura, H., Terashima, T., Waki, Y., Soejima, K., Fujishima, S., & Kanazawa, M. (1995). Attenuation of hyperoxic lung injury by the 21-aminosteroid U-74389G. Journal of Applied Physiology, 78(5), 1635-1641. https://doi.org/10.1152/jappl.1995.78.5.1635