Rac1 drives melanoblast organization during mouse development by orchestrating pseudopod- driven motility and cell-cycle progression

Li, Ang and Ma, Yafeng and Yu, Xinzi and Mort, Richard L. and Lindsay, Colin R. and Stevenson, David and Strathdee, Douglas and Insall, Robert H. and Chernoff, Jonathan and Snapper, Scott B. and Jackson, Ian J. and Larue, Lionel and Sansom, Owen J. and Machesky, Laura M. (2011) Rac1 drives melanoblast organization during mouse development by orchestrating pseudopod- driven motility and cell-cycle progression. Developmental Cell, 21 (4). pp. 722-734. ISSN 1534-5807

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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.

Item Type:
Journal Article
Journal or Publication Title:
Developmental Cell
Additional Information:
Copyright © 2011 Elsevier Inc. All rights reserved.
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1300/1309
Subjects:
ID Code:
84133
Deposited By:
Deposited On:
20 Jan 2017 14:02
Refereed?:
Yes
Published?:
Published
Last Modified:
28 Oct 2020 05:23