Decoding benign prostatic hyperplasia at single-cell resolution: heterogeneity, inflammation, and beyond androgen-driven pathogenesis.

Benign prostatic hyperplasia (BPH) represents a highly prevalent age-related disorder, traditionally managed through androgen-driven pathways. However, the limited efficacy of conventional hormonal therapies in a substantial subset of patients necessitates the investigation of alternative pathogenic mechanisms. The emergence of single-cell RNA sequencing (scRNA-seq) has provided the necessary resolution to map cellular heterogeneity and microenvironmental dynamics within the prostate. This review synthesizes recent advancements in applying scRNA-seq to BPH research, highlighting a transition from a homogeneous, hormone-centric view toward recognizing BPH as a complex, heterogeneous process driven by multifaceted cell-immune interactions. We detail how scRNA-seq has identified distinct cellular subsets within the hyperplastic transition zone, including novel basal epithelial subtypes and activated fibroblast populations that contribute directly to nodule formation and disease progression. Furthermore, we examine the central role of chronic inflammation, mediated by immune cell infiltration and senescence-associated secretory phenotypes (SASP), in perpetuating a proliferative microenvironment. The technology also clarifies mechanisms underlying treatment resistance and identifies potential biomarkers and novel therapeutic targets beyond the androgen axis, such as the CXCL13/CD4