Role of SAM68 in Sunitinib Induced Renal Cell Carcinoma Apoptosis

Authors

Zeshen Wu
Yulu Peng
Longbin Xiong
Jun Wang
Zhen Li
Kang Ning
Minhua Deng
Ning Wang
Wensu Wei
Zhiyong Li
Pei Dong
Chunping Yu
Fangjian Zhou
Zhiling Zhang

Publication Date

10-1-2022

Journal

Cancer Medicine

Abstract

Sunitinib is one of the first-line targeted drugs for metastatic renal cell carcinoma (RCC) with dual effects of antiangiogensis and proapoptosis. Sam68 (Src-associated in mitosis, 68 KDa), is found being involved in cell apoptosis. This article reveals that Sam68 impacts the sensitivity to sunitinib by mediating the apoptosis of RCC cells. Immunohistochemical staining indicated that the Sam68 expression levels in sunitinib sensitive tumor tissues were markedly higher than those in sunitinib resistant tumor tissues. Sunitinib induced RCC cell apoptosis in a concentration-dependent manner and inhibited the expression of total and phosphorylated Sam68 (p-Sam68). Downregulation of Sam68 expression inhibited RCC cell apoptosis induced by sunitinib. While upregulation of Sam68 expression could enhance apoptosis induced by sunitinib. Xenograft models showed that tumors in the Sam68-knockdown group did not shrink as much as those in the control group after treatment with sunitinib for 4 weeks. Together, our results suggest that Sam68 expression is associated with the sensitivity of ccRCC patients to sunitinib. Sam68 may promote cell apoptosis induced by sunitinib, and the Sam68 expression level may be a biomarker for predicting sunitinib sensitivity in ccRCC patients.

Keywords

Apoptosis, Carcinoma, Renal Cell, Cell Line, Tumor, Drug Resistance, Neoplasm, Humans, Kidney Neoplasms, Sunitinib, cell apoptosis, drug sensitivity, renal cell carcinoma, Sam68, sunitinib

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Supplementary Materials

PMID: 35476809