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Therapeutically targeting glypican-3 via a conformation-specific single-domain antibody in hepatocellular carcinoma.


ABSTRACT: Glypican-3 (GPC3) has emerged as a candidate therapeutic target in hepatocellular carcinoma (HCC), but the oncogenic role of GPC3 in HCC is poorly understood. Here, we report a human heavy-chain variable domain antibody, HN3, with high affinity (Kd = 0.6 nM) for cell-surface-associated GPC3 molecules. The human antibody recognized a conformational epitope that requires both the amino and carboxy terminal domains of GPC3. HN3 inhibited proliferation of GPC3-positive cells and exhibited significant inhibition of HCC xenograft tumor growth in nude mice. The underlying mechanism of HN3 action may involve cell-cycle arrest at G1 phase through Yes-associated protein signaling. This study suggests a previously unrecognized mechanism for GPC3-targeted cancer therapy.

SUBMITTER: Feng M 

PROVIDER: S-EPMC3607002 | biostudies-literature | 2013 Mar

REPOSITORIES: biostudies-literature

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Therapeutically targeting glypican-3 via a conformation-specific single-domain antibody in hepatocellular carcinoma.

Feng Mingqian M   Gao Wei W   Wang Ruoqi R   Chen Weizao W   Man Yan-Gao YG   Figg William Douglas WD   Wang Xin Wei XW   Dimitrov Dimiter S DS   Ho Mitchell M  

Proceedings of the National Academy of Sciences of the United States of America 20130305 12


Glypican-3 (GPC3) has emerged as a candidate therapeutic target in hepatocellular carcinoma (HCC), but the oncogenic role of GPC3 in HCC is poorly understood. Here, we report a human heavy-chain variable domain antibody, HN3, with high affinity (Kd = 0.6 nM) for cell-surface-associated GPC3 molecules. The human antibody recognized a conformational epitope that requires both the amino and carboxy terminal domains of GPC3. HN3 inhibited proliferation of GPC3-positive cells and exhibited significan  ...[more]

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