Induction of efficient T-cell immunity against autologous leukemia cells by dendritic cells pulsed with the leukemia cell total RNA / 中华血液学杂志
Chinese Journal of Hematology
;
(12): 461-464, 2005.
Article
in Chinese
| WPRIM
| ID: wpr-255860
ABSTRACT
<p><b>OBJECTIVE</b>To assess the feasibility and efficiency of eliciting leukemia-specific T cell responses in acute myeloid leukemia patients in complete remission (AML-CR) in vitro by dendritic cells (DC) pulsed with the leukemia cells total RNA.</p><p><b>METHODS</b>The immature DCs were generated from the adherent bone marrow mononuclear cell in vitro in the presence of combined cytokines (GM-CSF 100 ng/ml, IL-4 500 U/ml), and pulsed with total RNA isolated from autologous leukemic cells by cationic lipid 1,2-dioleoyloxy-3-trimethyl ammonium propane (DOTAP) at day 5 of culture. Then the cells were incubated for another 24 h in a medium containing 10 ng/ml of TNF-alpha for maturation of DC. After the total 7 days culture, the cells were harvested as the mRNA-DC and the expression of mature DC markers were determined by FACS. The proliferative capacity of T cell activated by mRNA-DC was determined by MTT assay. Meanwhile, the mRNA-DC was co-cultured with T lymphocytes at a ratio of 13 for 7 days. The activated T lymphocytes were harvested, the secretion of IFN-gamma was determined by ELISPOT assay, and the cytotoxicity was analyzed in vitro by LDH release assay.</p><p><b>RESULTS</b>After culture, the BMMNC from 14 AML-CR patients developed morphologic and phenotypic characteristics of mature DC. At a stimulator/reactor ratio of 116, auto-T lymphocytes primed with mRNA-DC exhibited significant proliferative activity compared with T lymphocyte primed with non-pulsed DC [(36.84 +/- 5.68)% vs (12.20 +/- 3.16)%, (P < 0.05)]. An expansion of mRNA reacted T cell secreting IFN-gamma could be observed on ELISPOT assay. At an effector/target ratio of 201, the auto-T lymphocytes primed with mRNA-DC exhibited significant killing activity to auto-AML cells (45.46 +/- 6.34 )% as compared with that stimulated by IL-2 alone (13.26 +/- 2.28)% or primed by non-pulsed DC (12.32 +/- 1.32)% (P < 0.05).</p><p><b>CONCLUSION</b>Immunization with DC-leukemia cell RNA vaccines may be a simple, rapid and potent approach to elicitation of T cell-mediated anti-leukemia immunity.</p>
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Pharmacology
/
Dendritic Cells
/
RNA
/
T-Lymphocytes
/
Leukemia, Myeloid, Acute
/
Cell Communication
/
Cells, Cultured
/
Coculture Techniques
/
Allergy and Immunology
/
Genetics
Limits:
Adolescent
/
Adult
/
Female
/
Humans
/
Male
Language:
Chinese
Journal:
Chinese Journal of Hematology
Year:
2005
Type:
Article
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