Interleukin-17A: a T-cell-derived growth factor for murine and human mesenchymal stem cells

Stem Cells
Weitao HuangPaul Schwarzenberger

Abstract

Interleukin-17A (IL-17A) is a proinflammatory cytokine expressed in activated T-cells. It is required for microbial host defense and is a potent stimulator of granulopoiesis. In a dose-dependent fashion, IL-17A expanded human mesenchymal stem cells (MSCs) and induced the proliferation of mature stroma cells in bone marrow-derived stroma cultures. Recombinant human interleukin-17A (rhIL-17A) nearly doubled colony-forming unit-fibroblast (CFU-f) frequency and almost tripled the surface area covered by stroma. In a murine transplant model, in vivo murine (m)IL-17A expression enhanced CFU-f by 2.5-fold. Enrichment of the graft with CD4(+) T-cell resulted in a 7.5-fold increase in CFU-f in normal C57BL/6, but only threefold in IL-17Ra(-/-) mice on day 14 post-transplant. In this transplant model, in vivo blockade of IL-17A in C57BL/6 mice resembled the phenotype of IL-17Ra(-/-) mice. Approximately half of the T-cell-mediated effect on MSC recovery following radiation-conditioned transplantation was attributed to the IL-17A/IL-17Ra pathway. Pluripotent MSCs have the potential of regenerating various tissues, and mature stroma cells are critical elements of the hematopoietic microenvironment (HME). The HME is pivotal for formation and...Continue Reading

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