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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Autoantibodies to the laminin P1 fragment in HgCl2-induced membranous glomerulopathy.

Exposure to mercuric chloride induces the development of a membranous glomerulopathy with high proteinuria in DZB rats, in which immunoglobulin (Ig)G1 and IgG2a bound in the glomeruli were previously found to react with laminin of the EHS tumor and several unidentified glomerular basement membrane components. Monoclonal antibodies were prepared by fusing cervical and mandibular lymph node cells from a HgCl2-treated DZB rat with a nonsecreting mouse myeloma. Monoclonal antibodies were screened for reactivity with collagenase-digested glomerular basement membrane and kidney sections; upon subcloning, eight stable hybridomas were obtained, named MEC1 to MEC8. MEC2 ( IgG1, kappa), MEC3 (IgM, kappa), and MEC5 ( IgG1, kappa), as well as the polyclonal glomerular eluate, reacted preferentially with the P1 fragment of the laminin-1 (alpha 1 beta 1 gamma 1) isoform. MEC8 (IgM, kappa) reacted with the P1 and the E4 fragment of laminin. Both MEC6 (IgM, kappa) and MEC8 bound to actin and to various other, unidentified cellular antigens, indicating that MEC6 and MEC8 are polyreactive antibodies. MEC7 (IgM, kappa) bound to a cytoskeleton-linked cell membrane antigen, present on various epithelial cells and between heart muscle fibers and associated with small peripheral, intramuscular nerves. Several of the MEC monoclonal antibodies bound in vivo along the glomerular capillary wall. Although discrete electron-dense subepithelial immune aggregates were not detected and proteinuria was not induced, MEC3 localization changed from a continuous pattern into a fine granular pattern along the glomerular basement membrane, and focally along the TBM, upon passive transfer into naive DZB rats. These findings suggest a pathogenetic role for the P1 fragment of laminin either in the induction phase of HgCl2-induced membranous glomerulopathy as an immunogen or in the effector phase as a target antigen.[1]


  1. Autoantibodies to the laminin P1 fragment in HgCl2-induced membranous glomerulopathy. Aten, J., Veninga, A., Coers, W., Sonnenberg, A., Timpl, R., Claessen, N., van Eendenburg, J.D., de Heer, E., Weening, J.J. Am. J. Pathol. (1995) [Pubmed]
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