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Pascucci, L. et al.

Pascucci, Mercati, Gargiulo, Pedini, Sorbolini, Ceccarelli,

CD34 glycoprotein identifies putative stem cells located in the isthmic region of canine hair follicles.

It is widely documented that a pool of multipotent stem cells located in humans and mice hair follicle outer root sheath (bulge region) is involved in the restoration of the whole follicular unit during each anagen phase. To the authors' knowledge, data regarding the location and characterization of hair follicle stem compartment in dogs have not been reported in the recent relevant literature. In this study, we investigated the haematopoietic stem and progenitor cell antigen CD34 as a marker of putative stem cells located in a bulge-like region of canine hair follicles. The presence of CD34 mRNA and glycoprotein was assessed on formalin-fixed, paraffin-embedded canine skin samples by in situ hybridization technique and by standard immunohistochemistry, respectively. A strong expression of CD34 mRNA and glycoprotein was observed in a well-defined area of the hair follicle isthmic region and appeared uniformly concentrated at the level of the basal layer of the outer root sheath. These findings provide compelling support to the hypothesis that in dogs, a subpopulation of basal keratinocytes located in the hair follicle isthmic region and characterized by the selective expression of CD34 is potentially associated with the stem cell compartment of this skin appendage.[1]

References

CD34 glycoprotein identifies putative stem cells located in the isthmic region of canine hair follicles. Pascucci, L., Mercati, F., Gargiulo, A.M., Pedini, V., Sorbolini, S., Ceccarelli, P. Vet. Dermatol. (2006) [Pubmed]

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