The Arp2/3 complex is crucial for colonisation of the mouse skin by melanoblasts

Vassilis Papalazarou, Karthic Swaminathan, Farah Jaber-Hijazi, Heather Spence, Ines Lahmann, Colin Nixon, Manuel Salmeron-Sanchez, Hans-Henning Arnold, Klemens Rottner, Laura M. Machesky

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Abstract

The Arp2/3 complex is essential for the assembly of branched filamentous actin but its role in physiology and development is surprisingly little understood. Melanoblasts deriving from the neural crest migrate along the developing embryo and traverse the dermis to reach the epidermis colonising the skin and eventually homing within the hair follicles. We have previously established that Rac1 and Cdc42 direct melanoblast migration in vivo. We hypothesised that the Arp2/3 complex might be the main downstream effector of these small GTPases. Arp3 depletion in the melanocyte lineage results in severe pigmentation defects in dorsal and ventral regions of the mouse skin. Arp3 null melanoblasts demonstrate proliferation and migration defects and fail to elongate as their wild-type counterparts. Conditional deletion of Arp3 in primary melanocytes causes improper proliferation, spreading, migration and adhesion to extracellular matrix. Collectively, our results suggest that the Arp2/3 complex is absolutely indispensable in the melanocyte lineage in mouse development, and indicate a significant role in developmental processes that require tight regulation of actin-mediated motility.
Original languageEnglish
Article number194555
Number of pages39
JournalDevelopment
DOIs
Publication statusPublished - 7 Oct 2020
Externally publishedYes

Keywords

  • Arp2/3
  • melanoblasts
  • migration
  • development
  • actin cytoskeleton
  • skin pigmentation

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