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Am J Physiol Lung Cell Mol Physiol 264: L391-L400, 1993;
1040-0605/93 $5.00
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AJP - Lung Cellular and Molecular Physiology, Vol 264, Issue 4 391-L400, Copyright © 1993 by American Physiological Society

ARTICLES

Cell surface carbohydrates modulate neutrophil adherence to alveolar type II cells in vitro

B. Crestani, C. Rolland, A. Petiet, N. Colas-Linhart and M. Aubier
Institut National de la Sante et de la Recherche Medicale U. 226, Paris, France.

We characterized the influence of phosphorylated sugars and cell surface sialic acids on the adherence of human polymorphonuclear leukocyte (PMN) to rat alveolar type II cell (ATII cells) and human-derived A549 cell monolayers in vitro. Percent adherence of radiolabeled polymorphonuclear leukocytes was assessed after incubating cells with the carbohydrates, enzymes, or lectins to be tested. Lactose-1-phosphate (Lact1P) and maltose-1-phosphate (Malt1P) (10 mM) inhibited adherence of PMN to ATII cells and A549 cells. Maximal inhibition followed treatment of both PMN and rat ATII cells and amounted to 85 +/- 7% with Lact1P and 92 +/- 3% with Malt1P. Inhibition was concentration dependent. Incubation of PMN with mannose-6-phosphate reduced adherence to rat ATII cells and A549 cells by 36 +/- 11 and 39 +/- 8%, respectively. Maximal concentrations of sugars did not alter cellular viability. Neuraminidase-induced desialilation of ATII cells increased adherence of PMN by 36 +/- 7% to rat ATII cells and by 86 +/- 18% to A549 cells. Masking of terminal sialic acids on rat ATH cells with Limulus polyphemus agglutinin (100 micrograms/ml) increased adherence by 50 +/- 2%. These results indicate that cell surface carbohydrates are involved in the regulation of the adhesive interaction between PMN and ATII cells in vitro.


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