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In order to study the localization of Lentil lectin (LCH)-binding glycoresidues in glomeruli from patients with a variety of glomerulopathies, and to elucidate the relationship between LCH-binding sugars and the components of the extracellular matrix, laminin and type IV collagen, investigations of formalin-fixed, paraffin-embedded kidney tissues digested with trypsin were carried out by the direct and indirect immunofluorescence microscopy techniques. The glomerular basement membrane (GBM) and the mesangium reacted well with LCH, whereas areas with sclerotic lesions exhibited a decreased reactivity. The pattern of LCH binding to the GBM in various glomerulopathies was similar to that of laminin but different from that of type IV collagen. The pattern of localization of LCH-reacting sites and of laminin in the GBM included the double linear lines in diabetic nephropathy, inner linear line with outer projections (spikes) in membranous nephropathy, and reduplicated basement membrane in membranoproliferative glomerulonephritis. The results obtained by enzyme-linked immunoadsorbent assay showed that LCH had a stronger reactivity for laminin than for type IV collagen or fibronectin. These findings suggest that LCH is more reactive with laminin than with other components of the glomerular extracellular matrix.
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