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- W2091189056 abstract "Laminin 5 regulates anchorage and motility of epithelial cells through integrins alpha6beta4 and alpha3beta1, respectively. We used targeted disruption of the LAMA3 gene, which encodes the alpha3 subunit of laminin 5 and other isoforms, to examine developmental functions that are regulated by adhesion to the basement membrane (BM). In homozygous null animals, profound epithelial abnormalities were detected that resulted in neonatal lethality, consistent with removal of all alpha3-laminin isoforms from epithelial BMs. Alterations in three different cellular functions were identified. First, using a novel tissue adhesion assay, we found that the mutant BM could not induce stable adhesion by integrin alpha6beta4, consistent with the presence of junctional blisters and abnormal hemidesmosomes. In the absence of laminin 5 function, we were able to detect a new ligand for integrin alpha3beta1 in the epidermal BM, suggesting that basal keratinocytes can utilize integrin alpha3beta1 to interact with an alternative ligand. Second, we identified a survival defect in mutant epithelial cells that could be rescued by exogenous laminin 5, collagen, or an antibody against integrin alpha6beta4, suggesting that signaling through beta1 or beta4 integrins is sufficient for survival. Third, we detected abnormalities in ameloblast differentiation in developing mutant incisors indicating that events downstream of adhesion are affected in mutant animals. These results indicate that laminin 5 has an important role in regulating tissue organization, gene expression, and survival of epithelium." @default.
- W2091189056 created "2016-06-24" @default.
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- W2091189056 date "1999-06-14" @default.
- W2091189056 modified "2023-10-14" @default.
- W2091189056 title "Targeted Disruption of the <i>LAMA3</i> Gene in Mice Reveals Abnormalities in Survival and Late Stage Differentiation of Epithelial Cells" @default.
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- W2091189056 doi "https://doi.org/10.1083/jcb.145.6.1309" @default.
- W2091189056 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2133157" @default.
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