STAT3 Inhibition Partly Abolishes IL-33–Induced Bone Marrow–Derived Monocyte Phenotypic Transition into Fibroblast Precursor and Alleviates Experimental Renal Interstitial Fibrosis

Previous studies of Jak-STAT inhibitors have shown promise in treating kidney diseases. The activation of Jak-STAT components is important in cell fate determination in many cell types, including bone marrow-derived cells, which are important contributors in renal interstitial fibrosis. In this study, we tested the effect of a new STAT3 inhibitor, BP-1-102, on monocyte-to-fibrocyte transition and the progression of renal interstitial fibrosis. We tested the effect of BP-1-102 in a mouse model of unilateral ureteral obstruction in vivo and IL-33-treated bone marrow-derived monocytes in vitro. BP-1-102 treatment alleviated renal interstitial fibrosis, reduced collagen deposition and extracellular matrix protein production, inhibited inflammatory cell infiltration, suppressed the percentage of CD45 + PDGFRβ + , CD45 + CD34 - Col I + and CD45 + CD11b + Col I + cells within the obstructed kidney and reduced the mRNA levels of the proinflammatory and profibrotic cytokines IL-1β, TGF-β, TNF-α, ICAM-1, and CXCL16. In vitro, BP-1-102 inhibited the IL-33-induced phenotypic transition into fibroblast precursors in bone marrow-derived monocytes, marked by reduced CD45 + CD34 - Col I + and CD45 + CD11b + Col I + cell percentage. Our results indicate a potential mechanism by which the STAT3 inhibitor BP-1-102 inhibits bone marrow-derived monocyte transition into fibroblast precursors in an IL-33/STAT3-dependent manner and thereby alleviates renal interstitial fibrosis.