Hair follicle bulge

A fascinating reservoir of epithelial stem cells

Manabu Ohyama

Research output: Contribution to journalArticle

119 Citations (Scopus)

Abstract

Hair follicles reconstitute themselves though the hair cycle, suggesting the presence of intrinsic stem cells. In contrast to the previous belief that stem cells reside in the bulbar region of hair follicles, stem cells were detected in the bulge area, a contiguous part of outer root sheath, that provides the insertion point for arrector pili muscle and marks the bottom of the permanent portion of hair follicles. The bulge cells are morphologically undifferentiated and slow-cycling under the normal conditions. Later, studies successively demonstrated that bulge cells possess stem cell properties such as high proliferative capacity and multipotency to regenerate not only hair follicles but also sebaceous glands and epidermis. Our knowledge of the bulge cell biology is rapidly increasing because of the identification of novel cell surface markers, the ability to isolate living bulge cells, and microarray analysis of multiple gene expression. Importantly, novel cell surface markers were identified on human bulge cells using precise laser capture microdissection and microarray analyses. Use of these markers enabled the successful enrichment of living human bulge cells, raising the possibility of future treatments of hair disorders using stem cells. Additional clinical relevance of bulge cell biology includes the importance of bulge cells as a gene therapy target and their possible roles in tumorigenesis.

Original languageEnglish
Pages (from-to)81-89
Number of pages9
JournalJournal of Dermatological Science
Volume46
Issue number2
DOIs
Publication statusPublished - 2007 May

Fingerprint

Hair Follicle
Stem cells
Stem Cells
Epithelial Cells
Cytology
Microarrays
Microdissection
Hair
Gene therapy
Cell Biology
Tissue Array Analysis
Laser Capture Microdissection
Gene expression
Sebaceous Glands
Muscle
Microarray Analysis
Epidermis
Genetic Therapy
Carcinogenesis
Lasers

Keywords

  • Bulge
  • Gene therapy
  • Hair follicle
  • Molecular signature
  • Regenerative medicine
  • Stem cell
  • Tumorigenesis

ASJC Scopus subject areas

  • Dermatology

Cite this

Hair follicle bulge : A fascinating reservoir of epithelial stem cells. / Ohyama, Manabu.

In: Journal of Dermatological Science, Vol. 46, No. 2, 05.2007, p. 81-89.

Research output: Contribution to journalArticle

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