Propylthiouracil treatment decreases the susceptibility to oxygen radical- induced lung damage in newborn rats exposed to prolonged hyperoxia

M. Rodriguez-Pierce, Ilene Sosenko, P. Whitney, L. Frank

Research output: Contribution to journalArticle

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Abstract

In newborn rats, antenatal thyroid stimulation with thyroid-releasing hormone is associated with developmental decreases in pulmonary antioxidant enzyme activities and decreased survival rates during prolonged hyperoxic exposure, with pathologic evidence of increased O2-induced lung damage. Propylthiouracil (PTU), in addition to its antithyroid effects, reportedly has antioxidant properties. To explore possible pulmonary protective effects from both the antithyroid and antioxidant properties of PTU, we administered PTU (0.015%) in drinking water to timed-pregnant rats for the final 10 d of gestation and during lactation; control rats received untreated water. The survival rate of the PTU-treated pups when placed in more than 95% O2 at birth was consistently higher at all time periods in hyperoxia from 6 d [PTU, 81 of 81 (100%); control pups, 70 of 84 (83%); p < 0.01] to 14 d [PTU, 41 of 53 (77%); control pups = 14 of 56 (25%); p < 0.01]. Further evidence of increased tolerance to more than 95% O2 in PTU pups included a significant decrease in the incidence of microscopic intraalveolar edema, decreased lipid peroxidation (malondialdehyde), and a significant increase in lung tissue surfactant-related phospholipids compared with O2-exposed control pups. No differences were present in lung structural maturation, antioxidant enzyme activity response to hyperoxia, or lung tissue O2 radical formation in more than 95% O2. We conclude that PTU treatment has important postnatal effects that protect newborn rats against oxidant-induced lung injury and lethality during hyperoxia, which may be related to PTU inhibition of thyroid hormone production, effect on O2 metabolism, or its direct antioxidant properties.

Original languageEnglish
Pages (from-to)530-535
Number of pages6
JournalPediatric Research
Volume35
Issue number5
StatePublished - Jan 1 1994

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Propylthiouracil
Hyperoxia
Reactive Oxygen Species
Lung
Antioxidants
Thyroid Hormones
Antithyroid Agents
Lung Injury
Enzymes
Malondialdehyde
Lactation
Oxidants
Surface-Active Agents
Drinking Water
Lipid Peroxidation
Edema
Phospholipids
Thyroid Gland
Parturition
Pregnancy

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health

Cite this

Propylthiouracil treatment decreases the susceptibility to oxygen radical- induced lung damage in newborn rats exposed to prolonged hyperoxia. / Rodriguez-Pierce, M.; Sosenko, Ilene; Whitney, P.; Frank, L.

In: Pediatric Research, Vol. 35, No. 5, 01.01.1994, p. 530-535.

Research output: Contribution to journalArticle

Rodriguez-Pierce, M. ; Sosenko, Ilene ; Whitney, P. ; Frank, L. / Propylthiouracil treatment decreases the susceptibility to oxygen radical- induced lung damage in newborn rats exposed to prolonged hyperoxia. In: Pediatric Research. 1994 ; Vol. 35, No. 5. pp. 530-535.
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