Proline-rich protein 15 (PRR15)

Proline-rich protein 15 (PRR15) is a small, highly conserved nuclear protein (~13.7 kDa) with a nuclear localization signal and several putative phosphorylation sites. PRR15 is predominantly expressed in embryonic and placental tissues, where it is required for normal trophoblast function, placental development, and embryo survival[3]. More recently, PRR15 has been identified as upregulated in several human cancers, including non-small cell lung cancer, colon adenocarcinoma, and breast cancer, where it promotes tumor cell proliferation, migration, and survival via the Akt-mTOR signaling pathway[2]. PRR15 depletion induces cell cycle arrest, suppresses proliferation, increases apoptosis, and reduces in vivo tumor growth[2][3]. Direct drug targeting of PRR15 is experimental, but its expression may serve as a prognostic biomarker in oncology. As a non-enzymatic, non-receptor nuclear factor, PRR15 functions may involve interaction with transcription factors or components of gene expression machinery, though its precise molecular mechanisms remain under investigation[3].

Other names

Proline rich 15PRR15proline-rich protein 15

Experimental genetic silencing (shRNA, CRISPR/Cas9 knockout) reduces tumor cell proliferation and migration, indicating that PRR15 is required for oncogenic Akt-mTOR pathway activation in non-small cell lung cancer[2]. No small molecule or biological therapeutics are currently documented to target PRR15 directly.