Demonstration of laminin,a basement membrane glycoprotein,in routinely processed formalin-fixed human tissues |
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Authors: | P Ekblom M Miettinen J Rapola J -M Foidart |
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Institution: | (1) Department of Pathology, University of Helsinki, SF-00290 Helsinki 29, Finland;(2) Children's Hospital, University of Helsinki, SF-00290 Helsinki 29, Finland;(3) Department of Obstetrics, University of Liège, B-4020 Liège, Belgium |
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Abstract: | Summary Laminin was demonstrated by immunoperoxidase and immunofluorescence staining in sections of normal human tissues fixed in formalin and routinely processed in paraffin. Exposure of the sections to a solution of pepsin (Burns et al. (1980) Histochemistry 67 73–78) revealed the antigenicity of this basement membrane glycoprotein. Sections from paraffin blocks stored for years at room temperature could be stained with this procedure. Normal human tissues, developing fetal tissues and tumors could be stained with this method. The staining patterns were similar to those seen in unfixed frozen sections. It thus appears that basement membrane components can be detected by immunohistological means from routinely processed histological samples, once the sections are pretreated with proteases. Staining for laminin could be used in embryonic studies and in histopathology to study the relation of cells to basement membranes and for the visualization of normal and abnormal vascularization.To whom offprint requests should be sent |
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