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Internalization-dependent regulation of HT29 cell proliferation by neurotensin

Valérie Navarro1, Stéphane Martin, Jean Mazella

  • 1Institut de Pharmacologie Moléculaire et Cellulaire, Unité Mixte de Recherche 6097 du Centre National de la Recherche Scientifique, 660 route des Lucioles, Sophia Antipolis, 06560 Valbonne, France.

Peptides
|July 28, 2006
PubMed

Insights

Neurotensin (NT) receptor internalization triggers MAP kinase activation and HT29 colon cancer cell growth. Blocking this process inhibits cancer cell proliferation, suggesting new therapeutic strategies.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • Neurotensin (NT) is a peptide hormone involved in various physiological processes.
  • The neurotensin receptor (NTR) mediates NT signaling pathways.
  • Understanding NT signaling in cancer is crucial for therapeutic development.

Purpose of the Study:

  • To investigate the role of NT/NTR complex internalization in MAP kinases Erk1/2 activation.
  • To determine the effect of internalization on inositol phosphates (IP) accumulation and HT29 cell growth.
  • To explore the potential of targeting NT/NTR internalization for colon cancer treatment.

Main Methods:

  • Utilized the human colonic cancer cell line HT29.
  • Employed hyperosmolar sucrose to block NT/NTR complex endocytosis.
  • Assessed MAP kinases Erk1/2 phosphorylation and [3H]-thymidine incorporation.
  • Measured NT-evoked inositol phosphates (IP) formation.

Main Results:

  • Blocking NT/NTR complex endocytosis abolished NT-induced MAP kinases Erk1/2 phosphorylation.
  • Inhibition of endocytosis also prevented NT-stimulated [3H]-thymidine incorporation, indicating reduced cell growth.
  • NT-evoked inositol phosphates (IP) formation was unaffected by the sucrose treatment.
  • NT/NTR complex internalization is essential for MAP kinase activation and HT29 cell proliferation.

Conclusions:

  • NT/NTR complex endocytosis is a critical signaling event for MAP kinase activation.
  • This process subsequently drives the proliferation of HT29 colon cancer cells.
  • Targeting NT/NTR internalization represents a promising strategy for novel anticancer therapies.

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