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• W1584513446 abstract "Many cells display directed migration toward specific compounds. The best-studied eukaryotic models of chemotaxis are polymorphonuclear leukocytes, which respond to formylated peptides and Dictyostelium amoebas, which respond to extracellular cAMP. In both cell types, chemoattractants bind to surface receptors that contain seven transmembrane domains and interact with G proteins. Some cells, such as fibroblasts, undergo chemotaxis toward compounds whose receptors lack this motif and transmit their signals by other mechanisms. The cytosolic changes elicited by chemoattractants include increased levels of cAMP, cGMP, inositol phosphates, and calcium. These changes are correlated with actin polymerization and other cytoskeletal events that result in preferential extension of pseudopods toward the chemoattractant. Dictyostelium cell lines in which specific genes have been disrupted have demonstrated the necessity of a cAMP receptor (cAR1) and a G protein alpha-subunit (G alpha 2) for responsiveness to cAMP. Other proteins, such as myosin heavy chain and several actin binding proteins, are dispensible although their absence does affect the details of chemotaxis. The disruption of other relevant genes and the genetic reconstitution of chemotaxis in cells lacking crucial proteins should reveal many clues about this complicated and fascinating process." @default.
• W1584513446 created "2016-06-24" @default.
• W1584513446 creator A5067792979 @default.
• W1584513446 creator A5091366547 @default.
• W1584513446 date "1991-12-01" @default.
• W1584513446 modified "2023-09-23" @default.
• W1584513446 title "Molecular insights into eukaryotic chemotaxis" @default.
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• W1584513446 doi "https://doi.org/10.1096/fasebj.5.15.1743439" @default.
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• W1584513446 hasPublicationYear "1991" @default.
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