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CDP138, a CDK5 binding partner, regulates cell proliferation and migration. However, the mechanisms by which CDP138 functions in these processes remain unclear. In this study, we show that CDP138 is frequently overexpressed and that high levels of CDP138 are correlated with lymph node metastasis in lung cancer. Furthermore, we provide evidence that CDP138-depleted lung cancer cells exhibit enhanced radiosensitivity as well as reduced migration and invasion. Mechanistically, we identify GDF15, a member of the TGF- β  superfamily, as a key downstream effector of CDP138. CDP138 silencing attenuates TGF- β /Smad signaling activation at least in part through the downregulation of GDF15. More importantly, the observed phenotypes caused by CDP138 knockdown are partially dependent on GDF15 inhibition. Together, our findings demonstrate that CDP138 positively modulates the TGF- β /Smad signaling pathway via GDF15 to promote radioresistance and metastasis, suggesting CDP138 as a potential oncogenic biomarker and a promising therapeutic target in the treatment of lung cancer.

CDP138 silencing inhibits TGF-β/Smad signaling to impair radioresistance and metastasis via GDF15 in lung cancer