Alterations in pulmonary surfactant after rapid arousal from torpor in the marsupial Sminthopsis crassicaudata
1 Department of Physiology, The University of Adelaide, Adelaide, South Australia 5005; and 2 Respiratory Research Group, Faculty of Medicine, University of Calgary, Calgary, Alberta, Canada T2N 4N1 Torpor in the dunnart, Sminthopsis crassicaudata , alters surfactant lipid composition and surface...
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Veröffentlicht in: | Journal of applied physiology (1985) 1999-06, Vol.86 (6), p.1959-1970 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | 1 Department of Physiology, The
University of Adelaide, Adelaide, South Australia 5005; and
2 Respiratory Research Group,
Faculty of Medicine, University of Calgary, Calgary, Alberta, Canada
T2N 4N1
Torpor in the dunnart,
Sminthopsis crassicaudata , alters
surfactant lipid composition and surface activity. Here we investigated changes in surfactant composition and surface activity over 1 h after
rapid arousal from torpor (15-30°C at 1°C/min). We
measured total phospholipid (PL), disaturated PL (DSP), and cholesterol (Chol) content of surfactant lavage and surface activity (measured at
both 15 and 37°C in the captive bubble surfactometer). Immediately after arousal, Chol decreased (from 4.1 ± 0.05 to 2.8 ± 0.3 mg/g dry lung) and reached warm-active levels by 60 min after arousal. The Chol/DSP and Chol/PL ratios both decreased to warm-active levels 5 min after arousal because PL, DSP, and the DSP/PL ratio remained
elevated over the 60 min after arousal. Minimal surface tension and
film compressibility at 17 mN/m at 37°C both decreased 5 min after
arousal, correlating with rapid changes in surfactant Chol. Therefore,
changes in lipids matched changes in surface activity during the
postarousal period.
phospholipids; cholesterol; surface activity; surface tension; temperature |
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ISSN: | 8750-7587 1522-1601 |
DOI: | 10.1152/jappl.1999.86.6.1959 |