Inhibition of c-MET is a potential therapeutic strategy for treatment of diffuse large B-cell lymphoma

Lab Invest. 2010 Sep;90(9):1346-56. doi: 10.1038/labinvest.2010.108. Epub 2010 Jun 7.

Abstract

Hepatocyte growth factor/c-MET has emerged as a potential therapeutic target for several cancers; however, its role in diffuse large B-cell lymphoma (DLBCL) has not been fully elucidated. In this study, we first investigated the role of c-Met in a large series of DLBCL tissues in a tissue microarray format. We then followed this with in vitro studies on DLBCL cell lines using either pharmacological inhibitors of c-Met or siRNA knockdown strategy. c-Met was found to be overexpressed in 73.2% of patients (186/254) and was significantly associated with overexpression of p-AKT (P=0.0274), p-GSK3 (P=0.0047) and Ki-67 (P=0.0012). Interestingly, c-Met overexpression was significantly more common in the germinal center subtype of DLBCL, as compared with activated B cell subtype (P=0.0002). Overexpression of c-Met in DLBCL was significantly associated with better survival (P=0.0028) and remained significant in multivariate analysis with international prognostic index, thereby confirming c-Met as independent prognostic marker for better outcome in DLBCL. In vitro pharmacological c-Met inhibition and siRNA targeted against c-Met triggered caspase-dependent apoptosis. These findings provide evidence that c-Met is an independent prognostic marker for better outcome in Middle Eastern DLBCL. This data also enlightens the fact that c-Met through AKT kinase has a critical role in carcinogenesis of DLBCL, and strongly suggest that targeting c-Met may have therapeutic value in treatment of DLBCL.

MeSH terms

  • B-Lymphocytes / metabolism
  • B-Lymphocytes / pathology
  • Female
  • Germinal Center / metabolism
  • Germinal Center / pathology
  • Hepatocyte Growth Factor / metabolism
  • Hepatocyte Growth Factor / therapeutic use
  • Humans
  • Lymphoma, B-Cell / pathology
  • Lymphoma, Large B-Cell, Diffuse / drug therapy
  • Lymphoma, Large B-Cell, Diffuse / metabolism*
  • Lymphoma, Large B-Cell, Diffuse / pathology*
  • Male
  • Middle Aged
  • Proto-Oncogene Proteins c-akt / metabolism
  • RNA, Small Interfering / pharmacology
  • RNA, Small Interfering / therapeutic use

Substances

  • RNA, Small Interfering
  • Hepatocyte Growth Factor
  • Proto-Oncogene Proteins c-akt