Rho-family small GTPases are required for cell polarization and directional sensing in Drosophila wound healing.
A wound induces cell polarization, in which myosin II is localized at the rear end of individual cells in a migrating epithelial sheet of the Drosophila larval epidermis. Here, we use myosin localization to demonstrate that Rac1, Cdc42, and Rho1 are each required for cell polarization and directional sensing of the wound. The three GTPases are also required for actin cable formation at the wound leading edge. Rac1, Cdc42, and Rho1 act upstream of c-Jun N-terminal kinase (JNK) to organize actin assembly. These results highlight the similarities between the molecular mechanism of Drosophila wound healing and those of Drosophila embryonic dorsal closure and the chemotactic response of Dictyostelium and leukocytes.
Baek
Seung Hee
SH
Department of Biology, Yonsei University, 262 Seongsanno, Seodaemun-gu, Seoul 120-749, Republic of Korea.
Kwon
Young-Chang
YC
Lee
Hyangkyu
H
Choe
Kwang-Min
KM
D000199:Actins / Q000378:metabolism; D000818:Animals; D016764:Cell Polarity; D029721:Drosophila Proteins / Q000235:genetics / Q000502:physiology*; D004331:Drosophila melanogaster / Q000201:enzymology / Q000502:physiology*; D048031:JNK Mitogen-Activated Protein Kinases / Q000378:metabolism; D009218:Myosins / Q000378:metabolism; D014945:Wound Healing; D020764:cdc42 GTP-Binding Protein / Q000235:genetics / Q000502:physiology*; D020744:rac GTP-Binding Proteins / Q000235:genetics / Q000502:physiology*; D020741:rho GTP-Binding Proteins / Q000235:genetics / Q000502:physiology*
D000199:Actins; D029721:Drosophila Proteins; C090146:Rac1 protein, Drosophila; D048031:JNK Mitogen-Activated Protein Kinases; D009218:Myosins; C511153:Rho1 protein, Drosophila; D020764:cdc42 GTP-Binding Protein; D020744:rac GTP-Binding Proteins; D020741:rho GTP-Binding Proteins