cAMP inhibits cell migration by interfering with Rac-induced lamellipodium formation.
Cell migration is critical for animal development and physiological as well as pathological responses. One important step during cell migration is the formation of lamellipodia at the leading edge of migrating cells. Here we report that the second messenger cAMP inhibits the migration of mouse embryonic fibroblast cells and mouse breast tumor cells. cAMP acts downstream of the small GTPase Rac and interferes with the formation of lamellipodia. Moreover, cAMP decreases the phosphorylation of the myosin light chain at the leading edge of cells and increases the phosphorylation of the vasodilator-stimulated phosphoprotein. Together with our previous report of a positive role of another second messenger, cGMP, in lamellipodium formation, our data indicate that cAMP and cGMP play opposite roles in modulating lamellipodium formation.
Chen
Lin
L
Department of Physiology, Cornell University Weill Medical College, New York, New York 10021, USA.
Zhang
J Jillian
JJ
Huang
Xin-Yun
XY
D015056:1-Methyl-3-isobutylxanthine / Q000494:pharmacology; D000818:Animals; D001943:Breast Neoplasms / Q000378:metabolism; D045744:Cell Line, Tumor; D002465:Cell Movement; D000242:Cyclic AMP / Q000378:metabolism*; D005347:Fibroblasts / Q000378:metabolism; D006801:Humans; D051379:Mice; D008822:Mice, Transgenic; D008954:Models, Biological; D018994:Myosin Light Chains / Q000378:metabolism; D010766:Phosphorylation; D011554:Pseudopodia / Q000378:metabolism*; D020744:rac GTP-Binding Proteins / Q000378:metabolism*
D018994:Myosin Light Chains; D000242:Cyclic AMP; D020744:rac GTP-Binding Proteins; D015056:1-Methyl-3-isobutylxanthine