Kinase D-interacting Substrate of 220 kDa Is Overexpressed in Gastric Cancer and Associated With Local Invasion.

Background/aim: Kinase D-interacting substrate of 220 kDa (Kidins220), also known as ankyrin repeat-rich membrane spanning protein (ARMS), is a transmembrane scaffold protein. Deregulated Kidins220 has been observed in various malignancies including melanoma, glioma, neuroblastoma, prostate cancer, pancreatic cancer, and ovarian cancer.

Materials and methods: In the current study, Kidins220 expression was determined at transcript and protein levels. A Kidins220 knockdown cell model was established to identify its role in cellular functions including cell cycle, proliferation, and invasion. Cell signalling was analysed by protein array and the TCGA gastric cancer cohort.

Results: Kidins220 transcript levels were significantly increased in gastric tumours, compared with adjacent normal tissues. More advanced tumours (TNMIII and TNMIV) exhibited higher protein levels of Kidins220 compared with early-stage tumours (TNMI and TNMII). Increased expression of Kidins220 in gastric cancer was associated with poorer overall survival. Loss of Kidins220 promoted cell invasion and adhesion of gastric cancer and correlated to epithelial-mesenchymal transition (EMT) and matrix metalloproteinase (MMP) signalling. Knockdown of Kidins220 promoted proliferation of gastric cancer cells with an increased population at the G₂/M phase.

Conclusion: Our study identified increased expression of Kidins220 in gastric cancer, which is associated with disease progression and poor prognosis. However, Kidins220 presented an inhibitory effect on the proliferation, invasion, and adhesion through a regulation of EMT, MMP and cell cycle.