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Apoptotic blebs from leukemic cells as a preferred source of tumor-associated antigen for dendritic cell-based vaccines.
Ruben, Jurjen M; van den Ancker, Willemijn; Bontkes, Hetty J; Westers, Theresia M; Hooijberg, Erik; Ossenkoppele, Gert J; de Gruijl, Tanja D; van de Loosdrecht, Arjan A.
Afiliação
  • Ruben JM; Department of Hematology, Cancer Center Amsterdam, VU University Medical Center, De Boelelaan 1117, 1081 HV, Amsterdam, The Netherlands.
Cancer Immunol Immunother ; 63(4): 335-45, 2014 Apr.
Article em En | MEDLINE | ID: mdl-24384837
Since few leukemia-associated antigens (LAA) are characterized for acute myeloid leukemia (AML), apoptotic tumor cells constitute an attractive LAA source for DC-based vaccines, as they contain both characterized and unknown LAA. However, loading DC with apoptotic tumor cells may interfere with DC function. Previously, it was shown in mice that apoptotic blebs induce DC maturation, whereas apoptotic cell remnants (ACR) do not. Here, we analyzed human monocyte-derived DC (MoDC) functionality in vitro, after ingesting either allogeneic AML-derived ACR or blebs. We show that MoDC ingest blebs to a higher extent and are superior in migrating toward CCL19, as compared to ACR-loaded MoDC. Although MoDC cytokine production was unaffected, co-culturing bleb-loaded MoDC with T cells led to an increased T cell proliferation and IFNγ production. Moreover, antigen-specific CD8(+) T cells frequencies increased to 0.63 % by priming with bleb-loaded MoDC, compared to 0.16 % when primed with ACR-loaded MoDC. Importantly, CD8(+) T cells primed by bleb-loaded MoDC recognized their specific epitope at one to two orders of magnitude lower concentrations compared to ACR-loaded MoDC. In conclusion, superior ingestion efficiency and migration, combined with favorable T cell cytokine release and CD8(+) T cell priming ability and avidity, point to blebs as the preferred component of apoptotic leukemic cells for LAA loading of DC for the immunotherapy of AML.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Células Dendríticas / Leucemia Promielocítica Aguda / Subpopulações de Linfócitos T / Apoptose / Vacinas Anticâncer / Micropartículas Derivadas de Células / Antígenos de Neoplasias Tipo de estudo: Risk_factors_studies Limite: Humans Idioma: En Revista: Cancer Immunol Immunother Assunto da revista: ALERGIA E IMUNOLOGIA / NEOPLASIAS / TERAPEUTICA Ano de publicação: 2014 Tipo de documento: Article País de afiliação: Holanda

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Células Dendríticas / Leucemia Promielocítica Aguda / Subpopulações de Linfócitos T / Apoptose / Vacinas Anticâncer / Micropartículas Derivadas de Células / Antígenos de Neoplasias Tipo de estudo: Risk_factors_studies Limite: Humans Idioma: En Revista: Cancer Immunol Immunother Assunto da revista: ALERGIA E IMUNOLOGIA / NEOPLASIAS / TERAPEUTICA Ano de publicação: 2014 Tipo de documento: Article País de afiliação: Holanda