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J Appl Physiol 79: 121-128, 1995;
8750-7587/95 $5.00
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Journal of Applied Physiology, Vol 79, Issue 1 121-128, Copyright © 1995 by American Physiological Society

ARTICLES

Lipocortin-1 distribution in bronchoalveolar lavage from healthy human lung: effect of prednisolone

S. F. Smith, T. D. Tetley, A. K. Datta, T. Smith, A. Guz and R. J. Flower
Department of Medicine, Charing Cross and Westminster Medical School, London, United Kingdom.

Lipocortin-1 (LC-1; annexin-1) may mediate some anti-inflammatory actions of the glucocorticoids, probably after binding to specific cell surface binding sites. We have quantified LC-1 levels in bronchoalveolar lavage (BAL) fluid and cells collected from seven healthy volunteers before and after 7 days of treatment with an oral glucocorticoid, prednisolone (30 mg/day). Extracellular BAL LC-1 was higher and cellular LC-1 was lower after prednisolone than before [extracellular: before, median 98 ng/mg albumin (range 48-350 ng/mg albumin); after, 236 ng/mg albumin (19-414 ng/mg albumin); P < 0.05. Cellular: before, 23.3 ng/10(6) cells (14.6-26.9 ng/10(6) cells); after, 18.0 ng/10(6) cells (122-268 ng/10(6) cells); P < 0.05]. The distribution of LC-1 within BAL cells ex vivo (cell surface = 25%, cytosol = 50%, membrane = 25%) was unaffected by prednisolone treatment. However, in adherent cells that had been cultured for 4 h, 70-80% of the LC-1 was on the cell surface. In summary, prednisolone appears to promote cellular release of LC-1. The difference in distribution of cellular LC-1 in BAL cells ex vivo and in vitro may reflect adherence and/or activation.


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