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Receptor binding characteristics and cytotoxicity of insulin-methotrexate

Xiao-Hong Ou1, An-Ren Kuang, Zheng-Lu Liang

  • 1Department of Nuclear Medicine, West China Hospital of Sichuan University, Chengdu 610041, Sichuan Province, China. ouxiaohong2002@xinhuanet.com

World Journal of Gastroenterology
|July 31, 2004
PubMed
Abstract

Insights

Insulin-methotrexate (MTX) conjugate targets cancer cells by binding to insulin receptors. This novel drug delivery system shows potential for receptor-mediated carcinoma therapy, effectively inhibiting hepatoma cell growth.

Area of Science:

  • Bioconjugation Chemistry
  • Cancer Therapeutics
  • Drug Delivery Systems

Background:

  • Insulin receptors are overexpressed on various carcinoma cells.
  • Developing targeted drug delivery systems can enhance therapeutic efficacy and reduce side effects.
  • Methotrexate (MTX) is a potent chemotherapeutic agent.

Purpose of the Study:

  • To synthesize and characterize an insulin-methotrexate (MTX) conjugate.
  • To evaluate the receptor binding affinity of the insulin-MTX conjugate.
  • To assess the cytotoxicity of the insulin-MTX conjugate on cancer cells.

Main Methods:

  • Covalent linkage of MTX to insulin.
  • Purification and HPLC analysis of the insulin-MTX conjugate.
  • Competitive binding assays using isolated hepatocellular carcinoma cell membranes.
  • MTT assay to evaluate the cytoreductive effect on BEL7402 and HL7702 cells.

Main Results:

  • Insulin-MTX conjugate demonstrated effective binding to insulin receptors, comparable to native insulin.
  • The dissociation constant (Kd) for insulin-MTX was significantly higher than for insulin, indicating altered binding kinetics.
  • Insulin-MTX significantly inhibited the growth of human hepatoma BEL7402 cells, achieving 79% inhibition by day 5.
  • Insulin-MTX showed minimal cytotoxicity to normal human hepatocytes (HL7702 cells).

Conclusions:

  • Insulin-MTX conjugate specifically targets cancer cells via insulin receptors.
  • The conjugate exhibits potent anti-proliferative effects on hepatoma cells.
  • Insulin serves as a viable carrier for targeted delivery of chemotherapeutic agents like MTX in cancer therapy.

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