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L1 cell adhesion molecule is a novel therapeutic target in intrahepatic cholangiocarcinoma

Jeong-Ki Min1, Jin-Man Kim, Shengjin Li

  • 1Therapeutic Antibody Research Center, Korea Research Institute of Bioscience and Biotechnology, Chungnam National University School of Medicine, Daejon, Korea.

Clinical Cancer Research : an Official Journal of the American Association for Cancer Research
|May 27, 2010
PubMed
Abstract

Insights

L1 cell adhesion molecule is highly expressed in intrahepatic cholangiocarcinoma (ICC), promoting tumor progression. Targeting L1 may offer a new therapeutic strategy for this aggressive cancer.

Area of Science:

  • Hepatobiliary oncology
  • Cancer immunology
  • Molecular oncology

Background:

  • Intrahepatic cholangiocarcinoma (ICC) is a malignant hepatobiliary cancer with poor prognosis.
  • Conventional therapies for ICC are often ineffective.
  • Novel molecular targets are needed for effective ICC treatment.

Purpose of the Study:

  • To identify a novel molecular target for ICC treatment.
  • To discover cancer-associated membrane antigens in ICC cells.

Main Methods:

  • Generated monoclonal antibodies (mAb) against ICC cell lines.
  • Screened mAbs for binding to ICC plasma membranes but not normal cells.
  • Identified L1 cell adhesion molecule as the target antigen.
  • Evaluated L1 expression in 42 ICC patient samples via immunohistochemistry.
  • Investigated L1's functional role in ICC progression through suppression, overexpression, and antibody treatment.

Main Results:

  • L1 was highly expressed in 40.5% of ICC patients, particularly at the invasive front.
  • L1 expression was absent in normal hepatocytes and bile duct epithelium.
  • L1 suppression decreased ICC cell proliferation, migration, and invasion in vitro.
  • L1 overexpression enhanced ICC cell proliferation, migration, invasion, and apoptosis resistance.
  • L1 suppression or anti-L1 mAb treatment reduced ICC xenograft tumor growth in vivo.

Conclusions:

  • L1 is expressed in ICC and significantly contributes to tumor progression.
  • L1 enhances ICC cell proliferation, migration, invasion, and survival.
  • L1 represents a promising novel therapeutic target for intrahepatic cholangiocarcinoma.

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