Aging Cell. 2020 Apr 22:e13116. doi: 10.1111/acel.13116. [Epub ahead of print]

Genetic correction of Werner syndrome gene reveals impaired pro-angiogenic function and HGF insufficiency in mesenchymal stem cells.

Tu J^1,2,3, Wan C^1,4,5, Zhang F^1,5, Cao L³, Law PWN¹, Tian Y¹, Lu G^1,3, Rennert OM⁶, Chan WY^1,3,5, Cheung HH^1,3,4,5.

Abstract

WRN mutation causes a premature aging disease called Werner syndrome (WS). However, the mechanism by which WRN loss leads to progeroid features evident with impaired tissue repair and regeneration remains unclear. To determine this mechanism, we performed gene editing in reprogrammed induced pluripotent stem cells (iPSCs) derived from WS fibroblasts. Gene correction restored the expression of WRN. WRN^+/+ mesenchymal stem cells (MSCs) exhibited improved pro-angiogenesis. An analysis of paracrine factors revealed that hepatocyte growth factor (HGF) was downregulated in WRN^-/- MSCs. HGF insufficiency resulted in poor angiogenesis and cutaneous wound healing. Furthermore, HGF was partially regulated by PI3K/AKT signaling, which was desensitized in WRN^-/- MSCs. Consistently, the inhibition of the PI3K/AKT pathway in WRN^+/+ MSC resulted in reduced angiogenesis and poor wound healing. Our findings indicate that the impairment in the pro-angiogenic function of WS-MSCs is due to HGF insufficiency and PI3K/AKT dysregulation, suggesting trophic disruption between stromal and epithelial cells as a mechanism for WS pathogenesis.