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SAMHD1-induced endosomal FAK signaling promotes human renal clear cell carcinoma metastasis by activating Rac1-mediated lamellipodia protrusion

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Author(s)
Sunho AnTam Thuy Lu VoTaekwon SonHoon ChoiJinyoung KimJuyeon LeeByung Hoon KimMisun ChoeEunyoung HaYoung-Joon SurhKyu-Won KimJi Hae Seo
Keimyung Author(s)
Kim, Jin YoungKim, Byung HoonChoe, Mi SunHa, Eun YoungSeo, Ji Hye
Department
Dept. of Internal Medicine (내과학)
Dept. of Urology (비뇨의학)
Dept. of Pathology (병리학)
Dept. of Biochemistry (생화학)
Journal Title
Exp Mol Med
Issued Date
2023
Volume
55
Issue
5
Abstract
Human sterile α motif and HD domain-containing protein 1 (SAMHD1) has deoxyribonucleoside triphosphohydrolase (dNTPase) activity that allows it to defend against human immunodeficiency virus type I (HIV-1) infections and regulate the cell cycle. Although SAMHD1 mutations have been identified in various cancer types, their role in cancer is unclear. Here, we aimed to investigate the oncogenic role of SAMHD1 in human clear cell renal cell carcinoma (ccRCC), particularly as a core molecule promoting cancer cell migration. We found that SAMHD1 participated in endocytosis and lamellipodia formation. Mechanistically, SAMHD1 contributed to the formation of the endosomal complex by binding to cortactin. Thereafter, SAMHD1-stimulated endosomal focal adhesion kinase (FAK) signaling activated Rac1, which promoted lamellipodia formation on the plasma membrane and enhanced the motility of ccRCC cells. Finally, we observed a strong correlation between SAMHD1 expression and the activation of FAK and cortactin in tumor tissues obtained from patients with ccRCC. In brief, these findings reveal that SAMHD1 is an oncogene that plays a pivotal role in ccRCC cell migration through the endosomal FAK-Rac1 signaling pathway.
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