Abstract
Stem and progenitor cells of the adult prostate epithelium have historically been believed to reside mainly or exclusively within the basal cell compartment and to possess basal-like phenotypic characteristics. Within the past decade, evidence of the existence of luminal epithelial cells exhibiting stem/progenitor properties has been obtained by lineage tracing and by functional characterization of sorted luminal-like cells. In 2020, the boom of single-cell transcriptomics led to increasingly exhaustive profiling of putative mouse luminal progenitor cells and, importantly, to the identification of cognate cells in the human prostate. The enrichment of luminal progenitor cells in genetically modified mouse models of prostate inflammation, benign prostate hypertrophy and prostate cancer, and the intrinsic castration tolerance of these cells, suggest their potential role in prostate pathogenesis and in resistance to androgen deprivation therapy. This Review bridges different approaches that have been used in the field to characterize luminal progenitor cells, including the unification of multiple identifiers employed to define these cells (names and markers). It also provides an overview of the intrinsic functional properties of luminal progenitor cells, and addresses their relevance in mouse and human prostate pathophysiology.
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