Lectin binding to collagen strands in histologic tissue sections

SummaryHistologic sections from human skin and uterine ligaments were stained with the following FITC conjugated lectins: Con A, WGA, s-WGA, SBA, DBA, UEA I, PNA, RCA I, BPA, GSA I, GSA II, MPA and LPA.The staining of the connective tissue was similar in the dermis and the uterine ligaments and it was most intense in the extracellular matrix containing collagen strands whereas the fibrocytes remained unstained. The staining was clear with glucose or N-acetylglucosamine binding lectins like Con A, WGA, s-WGA and GSA II, which may be related to the presence of glucose residues in collagenous hydroxylysine. The staining with some of the galactose or N-acetylgalactosamine binding lectins like RCA I, DBA, and BPA was less intense. This may reflect the presence of terminal galactose sugars in the hydroxylysine of collagen. No staining was found with SBA, UEA I, PNA, GSAI, MPA or LPA.The results show that different particularly glucose specific lectins bind to the extracellular matrix and especially to collagenous strands in connective tissue. It is suggested that this might be used in histochemical studies of connective tissue and particularly concerning the changes that may occur in different disease states.

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