Counter-rotational cell flows drive morphological and cell fate asymmetries in mammalian hair follicles.

TitleCounter-rotational cell flows drive morphological and cell fate asymmetries in mammalian hair follicles.
Publication TypeJournal Article
Year of Publication2018
AuthorsCetera, M, Leybova, L, Joyce, B, Devenport, D
JournalNat Cell Biol
Date Published2018 May
KeywordsAnimals, Cell Communication, Cell Differentiation, Cell Line, Cell Lineage, Cell Movement, Cell Polarity, Cell Shape, Epithelial Cells, Female, Gestational Age, Hair Follicle, Hedgehog Proteins, Male, Mechanotransduction, Cellular, Mesenchymal Stem Cells, Mice, Inbred C57BL, Morphogenesis, Myosin Type II, rho-Associated Kinases, Stem Cells, Time Factors, Tissue Culture Techniques

<p>Organ morphogenesis is a complex process coordinated by cell specification, epithelial-mesenchymal interactions and tissue polarity. A striking example is the pattern of regularly spaced, globally aligned mammalian hair follicles, which emerges through epidermal-dermal signaling and planar polarized morphogenesis. Here, using live-imaging, we discover that developing hair follicles polarize through dramatic cell rearrangements organized in a counter-rotational pattern of cell flows. Upon hair placode induction, Shh signaling specifies a radial pattern of progenitor fates that, together with planar cell polarity, induce counter-rotational rearrangements through myosin and ROCK-dependent polarized neighbour exchanges. Importantly, these cell rearrangements also establish cell fate asymmetry by repositioning radial progenitors along the anterior-posterior axis. These movements concurrently displace associated mesenchymal cells, which then signal asymmetrically to maintain polarized cell fates. Our results demonstrate how spatial patterning and tissue polarity generate an unexpected collective cell behaviour that in turn, establishes both morphological and cell fate asymmetry.</p>

Alternate JournalNat Cell Biol
PubMed ID29662173
PubMed Central IDPMC6065250
Grant ListR01 AR066070 / AR / NIAMS NIH HHS / United States
T32 GM007388 / GM / NIGMS NIH HHS / United States