Guinea pig lung development

Antioxidant enzymes and premature survival in high O2

Ilene Sosenko, L. Frank

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Whereas guinea pigs have advanced prenatal morphological lung development, their surfactant development is not 'precocious' compared with other small laboratory animals. To investigate whether maturation of the antioxidant enzyme (AOE) system coincides more closely with surfactant development or with morphological maturation, we assayed fetal guinea pig lungs at gestational days 49-69 for superoxide dismutase, catalase, and glutathione peroxidase activities. We found that elevations in pulmonary AOE occurred in parallel with increases in surfactant during the final 10-15% of gestation. Since newborn guinea pigs behave more like adult animals in their relative intolerance to hyperoxia, we explored whether prematurely delivered guinea pigs would tolerate high O2 exposure better than full-term newborns. We found that prematures have markedly improved hyperoxic tolerance compared with newborns (time at which 50% of animals died in >95% O2, 6.4 days vs. 4.5 days, respectively, P < 0.05); and (unlike newborns) premature pups are capable of mounting an elevated AOE response to hyperoxic challenge. Thus premature guinea pigs behave more like full-term newborns of other species in respect to hyperoxic tolerance, an additional precocious feature of guinea pig development.

Original languageEnglish
JournalAmerican Journal of Physiology - Regulatory Integrative and Comparative Physiology
Volume252
Issue number4
StatePublished - Jan 1 1987

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Guinea Pigs
Antioxidants
Lung
Enzymes
Surface-Active Agents
Hyperoxia
Laboratory Animals
Glutathione Peroxidase
Catalase
Superoxide Dismutase
Pregnancy

ASJC Scopus subject areas

  • Physiology

Cite this

Guinea pig lung development : Antioxidant enzymes and premature survival in high O2. / Sosenko, Ilene; Frank, L.

In: American Journal of Physiology - Regulatory Integrative and Comparative Physiology, Vol. 252, No. 4, 01.01.1987.

Research output: Contribution to journalArticle

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