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Maternal IL-6 can cause T cell-mediated juvenile alopecia by non-scarring follicular dystrophy in mice.

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Maternal IL-6 can cause T cell-mediated juvenile alopecia by non-scarring follicular dystrophy in mice.

Post  CausticSymmetry on Tue Dec 29, 2015 6:09 am

Exp Dermatol. 2015 Dec 14. doi: 10.1111/exd.12914. [Epub ahead of print]
Maternal IL-6 can cause T cell-mediated juvenile alopecia by non-scarring follicular dystrophy in mice.
Smith SE1, Maus RL1, Davis TR1, Sundberg JP2, Gil D1, Schrum AG1.

1Department of Immunology, Mayo Clinic College of Medicine, Rochester, MN.
2The Jackson Laboratory, Bar Harbor, ME.

Aiming to decipher immunological mechanisms of the autoimmune disorder Alopecia Areata (AA), we hypothesized that interleukin-6 (IL-6) might be associated with juvenile onset AA, for which there is currently no experimental model. Upon intramuscular transgenesis to overexpress IL-6 in pregnant female C57BL/6 (B6) mice, we found that the offspring displayed an initial normal and complete juvenile hair growth cycle, but developed alopecia around postnatal day 18. This alopecia was patchy and reversible (non-scarring), and was associated with upregulation of Ulbp1 expression, the only mouse homolog of the human AA-associated ULBP3 gene. Alopecia was also associated with inflammatory infiltration of hair follicles by lymphocytes, including alpha-beta T cells, which contributed to surface hair loss. Despite these apparently shared traits with AA, lesions were dominated by follicular dystrophy that was atypical of human AA disease, sharing some traits consistent with B6 alopecia and dermatitis. Additionally, juvenile-onset alopecia was followed by complete, spontaneous recovery of surface hair, without recurrence of hair loss. Prolonging exposure to IL-6 prolonged the time to recovery, but once recovered, repeating high-dose IL-6 exposure de novo did not re-induce alopecia. These data suggest that although substantial molecular and cellular pathways may be shared, functionally similar alopecia disorders can occur via distinct pathological mechanisms. 

Full: http://onlinelibrary.wiley.com/doi/10.1111/exd.12914/epdf

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