Abstract

Wnt/β-catenin signalling is a key regulator of hair follicle (HF) morphogenesis and life-long HF regeneration. In a recently published issue of Experimental Dermatology, Lei etal. report that sustained WNT10B supply and pathway activation in regenerating mouse HF increased the width of hair bulbs, hair shafts and the dermal papilla (DP), and enlarged the CD34(+) HF bulge cell compartment. Notably, WNT10B affected primarily zigzag HFs, while size and morphology of other HF types remained largely unaffected. Thus, these findings raise a number of questions regarding a HF type-specific function of Wnt/β-catenin and on the role of the WNT-stimulated DP in this process.

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