Abstract：
:During embryogenesis, melanoblasts proliferate and migrate ventrally through the developing dermis and epidermis as single cells. Targeted deletion of Rac1 in melanoblasts during embryogenesis causes defects in migration, cell-cycle progression, and cytokinesis. Rac1 null cells migrate markedly less efficiently, but surprisingly, global steering, crossing the dermal/epidermal junction, and homing to hair follicles occur normally. Melanoblasts navigate in the epidermis using two classes of protrusion: short stubs and long pseudopods. Short stubs are distinct from blebs and are driven by actin assembly but are independent of Rac1, Arp2/3 complex, myosin, or microtubules. Rac1 positively regulates the frequency of initiation of long pseudopods, which promote migration speed and directional plasticity. Scar/WAVE and Arp2/3 complex drive actin assembly for long pseudopod extension, which also depends on microtubule dynamics. Myosin contractility balances the extension of long pseudopods by effecting retraction and allowing force generation for movement through the complex 3D epidermal environment.
journal_name
Dev Celljournal_title
Developmental cellauthors
Li A,Ma Y,Yu X,Mort RL,Lindsay CR,Stevenson D,Strathdee D,Insall RH,Chernoff J,Snapper SB,Jackson IJ,Larue L,Sansom OJ,Machesky LMdoi
10.1016/j.devcel.2011.07.008subject
Has Abstractpub_date
2011-10-18 00:00:00pages
722-34issue
4eissn
1534-5807issn
1878-1551pii
S1534-5807(11)00300-5journal_volume
21pub_type
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