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Post-embedding colloidal gold immunolocalization of laminin to the lamina rara interna, lamina densa, and lamina rara externa of renal glomerular basement membranes

DR Abrahamson

Ultrastructural distribution of laminin within renal glomerular (GBM) and tubular basement membranes (TBM) was investigated using post- embedding immunolocalization with colloidal gold. Rat kidneys were fixed with 4% formaldehyde and embedded at 4 degrees C in Lowicryl K4M medium. Thin sections were then sequentially treated with affinity- purified rabbit anti-laminin IgG and anti-rabbit IgG conjugated to 10 nm diameter colloidal gold. Gold bound specifically to the GBM and TBM with particle densities of 690/micron2 and 731/micron2, respectively. In the GBM, the number of gold particles bound/micron2 of lamina densa greater than lamina rara externa greater than lamina rara interna. Closely similar binding patterns were found when kidneys were fixed with 0.5% glutaraldehyde plus 3% formaldehyde and embedded at 60 degrees C in L.R. White resin, but slightly less gold bound to sections overall than that seen with formaldehyde alone and Lowicryl. Taken together, these results illustrate that anti-laminin IgG, whether applied to fixed sections in vitro or introduced in vivo, bound to the lamina rara interna, lamina densa, and lamina rara externa of the GBM and throughout the TBM.

Volume 34, Issue 7, pp. 847-853, 07/01/1986
Copyright © 1986 by The Histochemical Society


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