Summary
The ultrastructural localization of the basement membrane glycoprotein laminin was investigated in basement membranes of proximal tubules of the mouse kidney. The localization of laminin was determined using two different immunoperoxidase and one immunogold preembedding technique and one immunogold postembedding technique on unfixed and formaldehyde fixed tissue. Strong differences in the immunolocalization for laminin were found in the lamina densa of the tubular basement membrane using different techniques.
After preembedding immunostaining for laminin using JgG-PO as secondary antibody, a positive reaction for the lamina densa was found in the formaldehyde fixed as well as in the unfixed kidney. After preembedding immunostaining for laminin using Protein-A-PO, staining of the l. densa was seen in the unfixed, but not in the fixed kidney. It was striking that no clear immunoreaction in the l. densa of the tubular basement membrane was seen in either the fixed or unfixed tissue after preembedding immunostaining for laminin using protein A-gold. With a direct postembedding immunogold technique laminin was localized only in the l. fibroreticularis and the l. rara but not in the l. densa of basement membranes of proximal tubules of the unfixed and the fixed kidney.
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Herken, R., Manshausen, B., Fussek, M. et al. Methodological dependence in the ultrastructural immunolocalization of laminin in tubular basement membranes of the mouse kidney. Histochemistry 87, 59–64 (1987). https://doi.org/10.1007/BF00518725
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DOI: https://doi.org/10.1007/BF00518725