Clusters of perifollicular macrophages in normal murine skin: Physiological degeneration of selected hair follicles by programmed organ deletion

Stefan Eichmüller, Carina Van Der Veen, Ingrid Moll, Barbara Hermes, Udo Hofmann, Sven Müller-Röver, Ralf Paus

Research output: Contribution to journalArticle

72 Scopus citations

Abstract

In back skin sections from adolescent C57BL/6 mice, regularly distributed, perifollicular inflammatory cell clusters (PICC) were found located around the distal noncycling portion of about 2% of all hair follicles examined. The PICC and the affected hair follicles were characterized during spontaneously developed or induced hair cycle stages, using antibodies against MHC Class II,F4/80, ER-MP23, NLDC 145, CD4, CD8, γδTCR, IL-1 receptor, and ICAM-1. PICC consisted predominantly of macrophages (MAC), accompanied by a few CD4 cells, whereas γδTCR+ and CD8+ cells were absent. During anagen and catagen, some of the PICC hair follicles showed variable degenerative phenomena reminiscent of scarring alopecia: thickened basement membrane, ectopic MHC II expression, MAC infiltration into the follicle epithelium, and signs of keratinocyte apoptosis. Loss of distal outer root sheath keratinocytes was detected in 10% of PICC hair follicles (0.2% of all hair follicles). Because PICC were located in the vicinity of the bulge region, MAC-dependent damage to follicle stem cells might eventually lead to follicle degeneration. These perifollicular MAC clusters around selected hair follicles may indicate the existence of a physiological program of MAC dependent controlled follicle degeneration by which damaged or malfunctioning follicles are removed by programmed organ deletion (POD).

Original languageEnglish (US)
Pages (from-to)361-370
Number of pages10
JournalJournal of Histochemistry and Cytochemistry
Volume46
Issue number3
DOIs
StatePublished - Mar 1998
Externally publishedYes

Keywords

  • Alopecia
  • Apoptosis
  • Hair cycle
  • ICAM 1
  • Inflammation
  • Lymphocyte
  • MHC Class II
  • Macrophage

ASJC Scopus subject areas

  • Anatomy
  • Histology

Fingerprint Dive into the research topics of 'Clusters of perifollicular macrophages in normal murine skin: Physiological degeneration of selected hair follicles by programmed organ deletion'. Together they form a unique fingerprint.

  • Cite this