PROX1: A Key Regulator of Hepatocyte Identity and Tumorigenesis

During ontogeny, the modulation of cell fate plasticity in stem cells is meticulously controlled as they undergo differentiation into distinct cell lineages. Dysregulation of this plasticity can result in pathologic conditions, such as oncogenesis. Transcription factors are pivotal in orchestrating this cellular transition by initiating gene expression programs that define cell identity. Notably, the investigation of transcriptional repressors has garnered significant attention in elucidating the susceptibility to cancer development. A recent research article published in Nature Genetics unveiled the identification of a liver-specific protein named prospero homeobox protein 1 (PROX1), which maintains cellular identity and impedes the initiation and advancement of liver cancer. Analysis of specimens from patients with liver cancer demonstrated a positive association between elevated levels of PROX1 and improved prognosis, as well as extended survival. Utilizing various liver cancer mouse models, the researchers demonstrated that PROX1 can impede tumor initiation and decelerate cancer progression. This study offers valuable insights for potential therapeutic interventions and introduces novel opportunities for investigating "safeguard repressors" in diverse tissue types.