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pubmed-article:8617343pubmed:abstractTextThe interaction of Entamoeba histolytica trophozoites with collagen involves cell adherence, formation, and release of electron dense granules (EDGs) containing collagenase activity leading to the degradation of the bound protein. The binding is thought to be mediated by an "integrin-like" collagen receptor. Since the signal transduction mechanisms triggered by the collagen-trophozoite interaction are unknown, but clearly involve cytoskeletal organization, we decided to explore the role of protein tyrosine phosphorylation in this process. Collagen induces a time-dependent increase in the phosphorylation of several polypeptides migrating around 67 and 110 kDa. One polypeptide of the high-molecular-weight component was identified as a 125-kDa protein with very similar epitopes to the focal treatment was a 42-kDa polypeptide related to the mitogen activated protein kinase (MAPK) family. Our results suggest that tyrosine phosphorylation is involved in collagen signaling in amoebas and that pp125FAK and p42MAPK homologs may play an active role in turning on the genetic program that enables the parasite to invade its host.lld:pubmed
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pubmed-article:8617343pubmed:articleTitleEntamoeba histolytica: involvement of pp125FAK in collagen-induced signal transduction.lld:pubmed
pubmed-article:8617343pubmed:affiliationDepartamento de Genética y Biología Molecular, CINVESTAV-IPN, Mexico DF, Mexico.lld:pubmed
pubmed-article:8617343pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:8617343pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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