Our global objective is to develop a molecular understanding of how epithelial stem cells undergo morphogenesis, homeostasis, and wound repair in mammalian skin and bring this research to a clinical setting. Our focus is on how skin stem cells utilize cytoskeletal connections to intercellular and cell substratum junctions to generate tissues. Knowledge of the proteins involved in coordinating actin filament (AF) cytoskeletal dynamics with adherens junctions (AJs) and elucidating how these connections are inversely coordinated with integrin-AF dynamics are key to understanding how self-renewing skin epithelium maintains and repairs its surface barrier and how a stem cell can give rise to a hair follicle (HF). Elucidating how microtubules (MTs) link to AJs is important for understanding how the stratified epidermis maintains a single layer of dividing cells, and how spindle polarity changes when stem cells are activated to produce HFs. A molecular understanding of these dynamics will be obtained by focusing on four cytoskeletal-junction linking proteins that surfaced as being key from our prior studies: ?-catenin, which coordinates and polarizes AF-AJ dynamics and suppresses AF-integrin dynamics; ACF7, which coordinates and polarizes MT-AF and Par3- mediated dynamics in a wound response; and Par3 and mInsc, whose polarization relies upon ?-catenin and 1 integrin, and which appear to be critical for orienting spindles in skin morphogenesis. Through biochemical and molecular approaches, we'll define and characterize the associated proteins that are involved in polarizing and remodeling cytoskeletal dynamics during skin morphogenesis and wound repair. Through mouse genetics and novel ShRNA strategies we've developed to rapidly knockdown genes in adult and embryonic skin, the functional significance of these proteins and their varied associations with other proteins will be ascertained. Finally, as the major players in these processes unfold, functional analyses will be combined with microarray data to define the underlying significance of global changes in AJ-cytoskeletal gene expression that occur concomitantly as stem cells receive external cues to remodel their AJ-cytoskeletal connections and initiate stratification and HF morphogenesis. Understanding how these cytoskeletal linkages are regulated in normal skin is a prerequisite to elucidating how defects in these processes lead to genetic disorders, including skin cancers. Past and present AR27883 research provides an excellent illustration of how molecular skin biology can help to generate new and improved tools for the diagnosis and treatment of human skin disease.

Public Health Relevance

Stem cells are natural units of tissue repair and homeostasis, and their versatility holds promise for tissue regeneration. This research focuses on deciphering how different tissue structures are derived from multipotent stem cells in the skin. Specifically, we focus on how stem cells within a single layer use cell-cell and cell substratum junctions to remodel their cytoskeleton to generate a stratified, differentiating epidermis or an invaginating hair follicle bud, and how this changes transiently in a wound response. This study is a fundamental prerequisite to understanding how aberrations in these basic properties go awry in skin cancers, including squamous cell carcinomas.

National Institute of Health (NIH)
National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS)
Method to Extend Research in Time (MERIT) Award (R37)
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Development - 2 Study Section (DEV2)
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Cibotti, Ricardo
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Rockefeller University
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New York
United States
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Ge, Yejing; Gomez, Nicholas C; Adam, Rene C et al. (2017) Stem Cell Lineage Infidelity Drives Wound Repair and Cancer. Cell 169:636-650.e14
Asare, Amma; Levorse, John; Fuchs, Elaine (2017) Coupling organelle inheritance with mitosis to balance growth and differentiation. Science 355:
Lane, Thomas R; Fuchs, Elaine; Slep, Kevin C (2017) Structure of the ACF7 EF-Hand-GAR Module and Delineation of Microtubule Binding Determinants. Structure 25:1130-1138.e6
Gonzales, Kevin Andrew Uy; Fuchs, Elaine (2017) Skin and Its Regenerative Powers: An Alliance between Stem Cells and Their Niche. Dev Cell 43:387-401
Sendoel, Ataman; Dunn, Joshua G; Rodriguez, Edwin H et al. (2017) Translation from unconventional 5' start sites drives tumour initiation. Nature 541:494-499
Yang, Hanseul; Adam, Rene C; Ge, Yejing et al. (2017) Epithelial-Mesenchymal Micro-niches Govern Stem Cell Lineage Choices. Cell 169:483-496.e13
Ouspenskaia, Tamara; Matos, Irina; Mertz, Aaron F et al. (2016) WNT-SHH Antagonism Specifies and Expands Stem Cells prior to Niche Formation. Cell 164:156-169
Ezratty, Ellen J; Pasolli, H Amalia; Fuchs, Elaine (2016) A Presenilin-2-ARF4 trafficking axis modulates Notch signaling during epidermal differentiation. J Cell Biol 214:89-101
Ge, Yejing; Zhang, Liang; Nikolova, Maria et al. (2016) Strand-specific in vivo screen of cancer-associated miRNAs unveils a role for miR-21(?) in SCC progression. Nat Cell Biol 18:111-21
Fuchs, Elaine (2016) Epithelial Skin Biology: Three Decades of Developmental Biology, a Hundred Questions Answered and a Thousand New Ones to Address. Curr Top Dev Biol 116:357-74

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