An internalizing antibody targeting of cell surface GRP94 effectively suppresses tumor angiogenesis of colorectal cancer

Yea Bin Cho, Ji Woong Kim, Kyun Heo, Hyun Jung Kim, Sumi Yun, Hye Seung Lee, Ha Gyeong Shin, Hyunbo Shim, Hanjin Yu, Yun Hee Kim, Sukmook Lee

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Colorectal cancer (CRC) is one of the life-threatening malignancies worldwide. Thus, novel potential therapeutic targets and therapeutics for the treatment of CRC need to be identified to improve the clinical outcomes of patients with CRC. In this study, we found that glucose-regulated protein 94 (GRP94) is overexpressed in CRC tissues, and its high expression is correlated with increased microvessel density. Next, through phage display technology and consecutive in vitro functional isolations, we generated a novel human monoclonal antibody that specifically targets cell surface GRP94 and shows superior internalizing activity comparable to trastuzumab. We found that this antibody specifically inhibits endothelial cell tube formation and simultaneously promotes the downregulation of GRP94 expression on the endothelial cell surface. Finally, we demonstrated that this antibody effectively suppresses tumor growth and angiogenesis of HCT116 human CRC cells without causing severe toxicity in vivo. Collectively, these findings suggest that cell surface GRP94 is a novel potential anti-angiogenic target in CRC and that antibody targeting of GRP94 on the endothelial cell surface is an effective strategy to suppress CRC tumor angiogenesis.

Original languageEnglish
Article number113051
JournalBiomedicine and Pharmacotherapy
StatePublished - Jun 2022

Bibliographical note

Funding Information:
This work was supported by research grants from the Bio & Medical Technology Development Program of the National Research Foundation funded by the Korean government ( NRF-2019M3E5D5065844, NRF-2020M3A9I2107093 ).

Funding Information:
We would like to thank the National Research Foundation of the Republic of Korea for its grant support. This work was supported by the Laboratory Animal Research Facility in the National Cancer Center Korea. Graphical abstracts, Fig. 2 , and Fig. 4 were created with .

Publisher Copyright:
© 2022 The Authors


  • Cell surface GRP94
  • Downregulation
  • Fully human antibody
  • Internalization
  • Tumor angiogenesis


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