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Lung cancer is the leading cause of cancer death worldwide,and non-small cell lung cancer (NSCLC) accounts for 80％-85％ of diagnostic cases.The molecular mechanisms of NSCLC pathogenesis are not well understood.Heterogeneous nuclear ribonucleoprotein K (hnRNPK) is a multifunctional protein that regulates gene expression and signal transduction and closely associated with tumorigenesis,but its mechanism of action in the pathogenesis of NSCLC is unclear.In this study,we observed that the expression patte of hnRNPK in H1299 lung adenocarcinoma cells varied depending on the cell density in culture.Moreover,hnRNPK stimulated the ability of proliferation and colony formation of H1299 cells,which is important for the multilayered cell growth in culture.We further investigated whether there is an association between hnRNPK and the elements involved in the cell contact inhibition pathway.By using quantitative reverse transcriptase-polymerase chain reaction assay and a YAP activity reporter system,we found that hnRNPK upregulated the mRNA and protein levels and transcriptional activity of Yes-associated protein 1 (YAP),a master negative regulator of Hippo contact inhibition pathway.Furthermore,YAP knockdown with siRNA abolished the stimulatory effect of hnRNPK on H1299 cell proliferation.These results suggested that YAP could be one of the effectors of hnRNPK.Our data may provide new clues for further understanding the biological functions of hnRNPK,particularly in the context of lung adenocarcinoma oncogenesis.