ArticleCell reports2026
Glomerular basement membrane structural integrity dictates trans-tissue deposition of laminin in the kidney.
Article in Cell reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Basement membranes (BMs) are specialized extracellular matrices (ECMs) essential for tissue structure and function. In non-vertebrates, ECM components can be produced both locally and by distant tissues. In contrast, mammalian ECM has traditionally been considered to originate predominantly from adjacent or tissue-resident cells. The kidney glomerular basement membrane (GBM), composed of laminin-α5β2γ1 and collagen-α3α4α5(IV), is produced by neighboring cells and functions as a filtration barrier. Alport syndrome, a genetic kidney disease, is characterized by GBM structural defects and ectopic laminin-α2 deposition, but the source of this laminin remains unknown. Here, using CRISPR-Cas9 transgenic models, we demonstrated that ectopic laminin-α2 in GBM originates not from local kidney cells but from the circulation. Furthermore, laminin-α2 in the mesangium partially derives from circulating sources even under healthy conditions. Our findings uncover a non-cell-autonomous mechanism whereby GBM integrity regulates circulating protein incorporation, revealing a trans-tissue regulation of BM composition in mammals.
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