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Research Article Free access | 10.1172/JCI113189

1,25-Dihydroxyvitamin D3 induces collagen binding to the human monocyte line U937.

B S Polla, A M Healy, M Byrne, and S M Krane

Department of Medicine, Harvard Medical School, Boston, Massachusetts 02114.

Find articles by Polla, B. in: JCI | PubMed | Google Scholar

Department of Medicine, Harvard Medical School, Boston, Massachusetts 02114.

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Department of Medicine, Harvard Medical School, Boston, Massachusetts 02114.

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Department of Medicine, Harvard Medical School, Boston, Massachusetts 02114.

Find articles by Krane, S. in: JCI | PubMed | Google Scholar

Published October 1, 1987 - More info

Published in Volume 80, Issue 4 on October 1, 1987
J Clin Invest. 1987;80(4):962–969. https://doi.org/10.1172/JCI113189.
© 1987 The American Society for Clinical Investigation
Published October 1, 1987 - Version history
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Abstract

Interactions of cells with components of the extracellular matrix can modulate cellular functions. We measured binding of a major matrix protein to U937 cells, a human promonocytic line. Radioiodinated type I or type III human collagen was bound only to U937 cells differentiated to a more mature phenotype with 1,25-dihydroxyvitamin D3 (1,25-(OH)2D3). Binding was observed at 4 degrees C and was saturable; Scatchard analysis of the binding to 1,25-(OH)2D3-pretreated U937 cells indicated a single class of high-affinity binding sites. Preincubation of U937 cells with interferon gamma did not induce collagen binding. Collagen binding did not appear to be dependent on fibronectin binding. Surface proteins of U937 cells were 125I labeled and cell membrane proteins resolved by affinity chromatography on collagen-Sepharose. Major specifically labeled bands of 180, 155, and 125 kD were identified in membrane fractions from 1,25-(OH)2D3-pretreated U937 cells only. 1,25-(OH)2D3 appears to specifically regulate collagen binding to monocyte precursors.

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