Macrophages are crucial mediators in the development of inflammatory diseases, including kidney diseases. Unresolved renal inflammation can progressively develop into chronic kidney disease (CKD), resulting in structural and functional impairment of the injured kidney due to renal fibrosis and leading to irreversible end-stage renal disease (ESRD). Increasing evidence suggests that phenotypic changes in macrophages are essential for CKD development and progression. Interestingly, advanced bioinformatics and single-cell RNA-sequencing analyses have revealed the crucial mechanism of macrophage-myofibroblast transition, which may be a novel therapeutic target for renal fibrosis. Therefore, a better understanding of the immunodynamics of macrophages in diseased kidneys may help identify effective therapeutic strategies for unmet clinical needs. This review summarizes the regulatory roles and underlying mechanisms of macrophages in renal fibrosis and their therapeutic implications in kidney diseases, including ESRD.
Fibrotic signaling plays a pivotal role in the development and progression of solid cancers including renal cell carcinoma (RCC). Intratumoral fibrosis (ITF) and pseudo-capsule (PC) fibrosis are significantly correlated to the disease progression of renal cell carcinoma. Targeting classic fibrotic signaling processes such as TGF-β signaling and epithelial-to-mesenchymal transition (EMT) shows promising antitumor effects both preclinically and clinically. Therefore, a better understanding of the pathogenic mechanisms of fibrotic signaling in renal cell carcinoma at molecular resolution can facilitate the development of precision therapies against solid cancers. In this review, we systematically summarized the latest updates on fibrotic signaling, from clinical correlation and molecular mechanisms to its therapeutic strategies for renal cell carcinoma. Importantly, we examined the reported fibrotic signaling on the human renal cell carcinoma dataset at the transcriptome level with single-cell resolution to assess its translational potential in the clinic.
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