Vibrissa Hair Bulge Houses Two Populations of Skin Epithelial Stem Cells Distinct by Their Keratin Profile

December 2007 in “ The FASEB journal ”

Danielle Larouche, Xuemei Tong, Julie Fradette, Pierre A. Coulombe, Lucie Germain

vibrissa hair follicles epithelial stem cells keratin profiles K5 K15 K17 K19 K14 basal layer suprabasal layers hair follicle stem cells skin tissue engineering hair follicles stem cells keratin

Studysummary This study demonstrated that hair follicle bulge stem cells can form epidermis in a tissue-engineered skin model, highlighting the significance of K5/K17 filaments in slow-cycling stem cell subsets.

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The study identified two distinct populations of skin epithelial stem cells in the vibrissa hair bulge, differentiated by their keratin profiles. This discovery provided insights into the complexity of stem cell niches in hair follicles and their potential roles in hair growth and skin regeneration. The research highlighted the role of specific keratins in cellular processes and the potential of outer root sheath cells to regenerate epidermis and contribute to hair follicle formation.

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Research cited in this study

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research Keratin 17 Modulates Hair Follicle Cycling in a TNFα-Dependent Fashion

169 citations , May 2006 in “Genes & Development”

This study found that keratin 17 and TNFα play interdependent roles in regulating hair follicle cycling, with TNFα required for the anagen–catagen transition and its ablation partially rescuing hair cycling defects in K17-null mice.

research A Novel Mouse Type I Intermediate Filament Gene, Keratin 17n, Exhibits Preferred Expression in Nail Tissue

31 citations , April 2004 in “Journal of Investigative Dermatology”

This study found that a newly identified gene, mK17n, may explain the lack of nail issues in mK17 null mice by compensating for mK17's function in the nail bed.

research Type II Epithelial Keratin 6hf (K6hf) Is Expressed in the Companion Layer, Matrix, and Medulla in Anagen-Stage Hair Follicles

60 citations , December 2003 in “Journal of Investigative Dermatology”

This study found that keratin 6hf, a type II keratin, is expressed in specific regions of mouse and human hair and suggests potential interactions with keratin 17, impacting hair development and associated disorders.

research Keratin 16 Expression Defines a Subset of Epithelial Cells During Skin Morphogenesis and the Hair Cycle

87 citations , November 2002 in “Journal of Investigative Dermatology”

research Keratin 17 Null Mice Exhibit Age- And Strain-Dependent Alopecia

122 citations , June 2002 in “Genes & Development”

This study found that K17 is crucial for the structural integrity and survival of hair-producing cells, with K17 null mice developing alopecia due to hair fragility and follicular alterations.

research Morphogenesis and Renewal of Hair Follicles from Adult Multipotent Stem Cells

949 citations , January 2001 in “Cell”

This study demonstrated that multipotent stem cells in adult mice whisker follicles migrate to produce whisker growth, and that this process requires precise control of stem cell trafficking.

research Involvement of Follicular Stem Cells in Forming Not Only the Follicle but Also the Epidermis

1010 citations , August 2000 in “Cell”

In this study, researchers found that hair follicle stem cells in mice can generate both hair follicle and epidermis cells, highlighting their potential bipotency.

research Expression of the Intermediate Filament Keratin Gene K15 in the Basal Cell Layers of Epithelia and the Hair Follicle

46 citations , November 1998 in “Experimental Cell Research”

This study found that K15 is variably expressed in sheep and mouse hair follicles, with specific patterns suggesting a role in the early stages of keratinocyte differentiation.

research Onset of Keratin 17 Expression Coincides with the Definition of Major Epithelial Lineages During Skin Development

318 citations , October 1998 in “The Journal of Cell Biology”

This study found that ectopic expression of the lymphoid-enhancer factor can induce K17 protein in the skin, suggesting a link between skin development and wound repair processes in mice.

research Keratin 19 as a Biochemical Marker of Skin Stem Cells In Vivo and In Vitro: Localization and Variation with Age and Culture Stage

441 citations , May 1996 in “Journal of Cell Science”

This study found that keratin 19 may be a marker for skin stem cells, helping to characterize these cells in different conditions and potentially explaining variations in healing rates between children and adults.

research Expression of Keratin K14 in the Epidermis and Hair Follicle: Insights Into Complex Programs of Differentiation

198 citations , November 1989 in “The Journal of Cell Biology”

This study reported that K14 expression patterns and keratin filament organization in human skin's hair follicles differ from those in the epidermis, indicating distinct differentiation programs.

research Patterns of Expression of Trichocytic and Epithelial Cytokeratins in Mammalian Tissues II: Concomitant and Mutually Exclusive Synthesis of Trichocytic and Epithelial Cytokeratins in Diverse Human and Bovine Tissues (Hair Follicle, Nail Bed and Matrix, Lingual Papilla, Thymic Reticulum)

187 citations , May 1988 in “Differentiation”

This study found that trichocytic cytokeratins, typically found in hair, are also present in nails, filiform papillae of the tongue, and the epithelial reticulum of the thymus.

research Patterns of Expression of Trichocytic and Epithelial Cytokeratins in Mammalian Tissues: Human and Bovine Hair Follicles

248 citations , April 1988 in “Differentiation”

In this study, researchers observed that trichocytic and epithelial cytokeratins have distinct expression patterns within various human and bovine hair follicle cells, contributing to understanding hair follicle development and growth.

research Keratins of the Human Hair Follicle: Hyperproliferative Keratins Consistently Expressed in Outer Root Sheath Cells In Vivo and In Vitro

135 citations , November 1987 in “Differentiation”

This study found that cultured outer root sheath cells from human hair follicles expressed a keratin profile similar to their in vivo environment, indicating environmental influence on keratin expression.

Acidic and Basic Hair/Nail (Hard) Keratins: Their Colocalization in Upper Cortical and Cuticle Cells of the Human Hair Follicle and Their Relationship to Soft Keratins

research Acidic and Basic Hair/Nail (Hard) Keratins: Their Colocalization in Upper Cortical and Cuticle Cells of the Human Hair Follicle and Their Relationship to Soft Keratins

356 citations , December 1986 in “The journal of cell biology/The Journal of cell biology”

This study found that specific human hair keratins are differentially expressed in the hair follicle, suggesting a shared pathway of epithelial differentiation between hair cortex and nail plate cells.