Volume 74, Issue 3 pp. 1411-1428
Original Article

Sulfatase 2 (SULF2) Monoclonal Antibody 5D5 Suppresses Human Cholangiocarcinoma Xenograft Growth Through Regulation of a SULF2–Platelet-Derived Growth Factor Receptor Beta–Yes-Associated Protein Signaling Axis

Xin Luo

Xin Luo

Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA

Hepatic Surgery Center and Hubei Key Laboratory of Hepato-Pancreatic-Biliary Diseases, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China

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Nellie A. Campbell

Nellie A. Campbell

Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA

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Li He

Li He

Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA

Department of Gastroenterology and Hepatology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China

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Daniel R. O'Brien

Daniel R. O'Brien

Division of Biomedical Statistics and Informatics, Mayo Clinic, Rochester, MN, USA

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Mark S. Singer

Mark S. Singer

Department of Anatomy, University of California San Francisco, San Francisco, CA, USA

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Hassan Lemjabbar-Alaoui

Hassan Lemjabbar-Alaoui

Department of Anatomy, University of California San Francisco, San Francisco, CA, USA

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Keun Soo Ahn

Keun Soo Ahn

Department of Surgery, Keimyung University School of Medicine, Keimyung University Dongsan Hospital, Daegu, Republic of Korea

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Rory Smoot

Rory Smoot

Department of Surgery, Mayo Clinic, Rochester, MN, USA

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Michael S. Torbenson

Michael S. Torbenson

Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA

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Steven D. Rosen

Steven D. Rosen

Department of Anatomy, University of California San Francisco, San Francisco, CA, USA

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Lewis R. Roberts

Corresponding Author

Lewis R. Roberts

Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA

ADDRESS CORRESPONDENCE AND REPRINT REQUESTS TO:

Lewis R. Roberts, M.B., Ch.B., Ph.D.

Division of Gastroenterology and Hepatology, Mayo Clinic

200 First Street SW

Rochester, MN 55905

E-mail: [email protected]

Tel.: +1-507-266-3239

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First published: 18 March 2021
Citations: 2
Supported by the National Institutes of Health (CA128633 and CA165076, to L.R.R.), the Mayo Clinic Center for Cell Signaling in Gastroenterology (NIDDK P30 DK084567), the Mayo Clinic Cancer Center (P30 CA015083), the Mayo Clinic Hepatobiliary SPORE (P50 CA210964), the Cholangiocarcinoma Foundation, and a National Research Foundation of Korea grant funded by the Korean government (2018R1C1B3004435).
Potential conflict of interest: Dr. Roberts advises and received grants from Bayer, Exact Sciences, and Gilead. He consults for AstraZeneca and MJH Life Sciences. He advises GRAIL, Tavec, QED, Genentech, and Envision Communications. He received grants from Ariad, BTG, GlycoTest, RedHill, TARGET, and Wako.

Abstract

Background and Aims

Existing therapeutic approaches to treat cholangiocarcinoma (CCA) have limited effectiveness, prompting further study to develop therapies for CCA. We report a mechanistic role for the heparan sulfate editing enzyme sulfatase 2 (SULF2) in CCA pathogenesis.

Approach and Results

In silico analysis revealed elevated SULF2 expression in human CCA samples, occurring partly through gain of SULF2 copy number. We examined the effects of knockdown or overexpression of SULF2 on tumor growth, chemoresistance, and signaling pathway activity in human CCA cell lines in vitro. Up-regulation of SULF2 in CCA leads to increased platelet-derived growth factor receptor beta (PDGFRβ)–Yes-associated protein (YAP) signaling activity, promoting tumor growth and chemotherapy resistance. To explore the utility of targeting SULF2 in the tumor microenvironment for CCA treatment, we tested an anti-SULF2 mouse monoclonal antibody, 5D5, in a mouse CCA xenograft model. Targeting SULF2 by monoclonal antibody 5D5 inhibited PDGFRβ–YAP signaling and tumor growth in the mouse xenograft model.

Conclusions

These results suggest that SULF2 monoclonal antibody 5D5 or related agents may be potentially promising therapeutic agents in CCA.

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