Transduction of acute myeloid leukemia cells with third generation self-inactivating lentiviral vectors expressing CD80 and GM-CSF: Effects on proliferation, differentiation, and stimulation of allogeneic and autologous anti-leukemia immune responses

R. C. Koya, N. Kasahara, V. Pullarkat, A. M. Levine, R. Stripecke

Research output: Contribution to journalArticle

36 Scopus citations

Abstract

Acute myeloid leukemia (AML) patients treated with available therapies achieve remission in approximately 60% of cases, but the long-term event-free survival is less than 30%. Use of immunotherapy during remission is a potential approach to increase survival. We propose to develop cell vaccines by genetic modification of AML cells with CD80, an essential T cell costimulator that is lacking in the majority of AML cases, and GM-CSF, to induce proliferation and activation of professional antigen-presenting cells. Here, we evaluated third generation self-inactivating (SIN) lentiviral vectors, which have the potential advantage of improved safety. CD80 and GM-CSF expression by these vectors was higher than that reported with second generation vectors (Stripecke et al, Blood 2000; 96: 1317-1326). In some cases, endogenous GM-CSF expression by transduced AML cells induced phenotypic changes consistent with the maturation of leukemia blasts into antigen-presenting cells. Further, in all cases studied, GM-CSF expression was associated with higher proliferation and cell viability. Allogeneic and autologous mixed lymphocyte reactions performed with transduced irradiated AML cells expressing CD80 and/or GM-CSF demonstrated that expression of either transgene enhanced T cell activation. These pre-clinical data demonstrate the potential feasibility of third generation SIN vectors for use in AML immunotherapy.

Original languageEnglish (US)
Pages (from-to)1645-1654
Number of pages10
JournalLeukemia
Volume16
Issue number9
DOIs
StatePublished - Sep 2002
Externally publishedYes

Keywords

  • AML
  • CD80
  • GM-CSF
  • Gene therapy
  • Immunotherapy
  • Lentivirus

ASJC Scopus subject areas

  • Hematology
  • Oncology
  • Cancer Research

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