1.Production of IL-12 from gene modified human dermal fibroblasts: A preclinical study for IL-12 cancer gene therapy.
Chae Hwa PARK ; Won Ki KANG ; Mi Sook OH ; Won Seog KIM ; Jung Hyun YANG ; Michael T LOTZE ; Sun Young KIM ; Keunchil PARK ; Chan H PARK
Experimental & Molecular Medicine 1997;29(1):65-69
Cytokine has been used as an immune stimulator and administered to patients for a treatment of cancer. Interleukin-12 (IL-12) is a potent cytokine which acts through a variety of functions including interferon-gamma production and cytotoxic T-cell activation. Considering the toxicity of high dose systemic IL-12 administration into human, local administration of low dose IL-12 can be a more efficient strategy. In ex vivo therapy, human dermal fibroblast has been considered as a useful vehicle for transferring genes, Here we show that human dermal fibroblast transduced with retrovirus containing IL-12 gene can be manipulated to produce reasonable amount of IL-12 protein. Human dermal fibroblast was isolated from freshly harvested skin specimens by collagenase digestion, grown in primary cultures, and transduced with a retroviral vector containing genes for human IL-12 and a selectable marker Neo(R). Following selection in G418, IL-12 producing fibroblasts were tested for secreted IL-12 level by ELISA. Six specimens of human skin were processed to obtain fibroblasts. ELISA results show that 40-150 units of IL-12 was produced for 24 h from 1x10(6) cells of transduced and selected fibroblast cultures. The primary cultures were maintained for up to nine passages about 108 days. The mean +/- overall time for obtaining enough number of cells was 49 +/- 2 days. The fibroblasts continued to produce IL-12 in culture for 90 days. These preliminary results can be used for the design of ex vivo gene therapy clinical trial using human dermal fibroblast.
Collagenases
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Digestion
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Enzyme-Linked Immunosorbent Assay
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Fibroblasts*
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Genes, Neoplasm*
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Genetic Therapy
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Humans*
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Interferon-gamma
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Interleukin-12*
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Retroviridae
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Skin
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T-Lymphocytes
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Zidovudine
2.Retroviral-mediated IL-12 gene therapy for advanced murine tumors.
Seon Hee KIM ; Chung Sun AN ; Hideaki TAHARA ; Chae Hwa PARK ; Michael T LOTZE ; Paul D ROBBINS ; Sun Young KIM
Experimental & Molecular Medicine 1997;29(1):53-58
Interleukin 12 (IL-12), a heterodimeric cytokine, promotes an effective antitumor response against tumors of various histological types when delivered systemically as a protein or locally by gene transfer. We investigated parameters that influenced the effectiveness of IL-12 retroviral-mediated gene therapy of cancer in animals using the murine breast cancer line TS/A. Syngeneic fibroblasts (TIB80), stably transduced with a retrovirus expressing murine IL-12, were used for peritumoral injection. Injection of fibroblasts into established tumors resulted in complete regression of tumor in 40 % of animals in a dose dependent manner when treated on day 4, and 20 % when treated on day 8. Significant inhibition of growth of day 21 and day 40 tumors was observed following peritumoral injection of IL-12-expressing fibroblasts in a dose-dependent manner. Delivery of IL-12 by syngeneic fibroblasts at a tumor site is effective in eradicating established, weakly immunogenic TS/A tumors.
Animals
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Breast Neoplasms
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Fibroblasts
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Genetic Therapy*
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Interleukin-12*
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Retroviridae
3.Anti-tumor activities of lung cancer dendritic cell vaccine modified by mutant Ki-ras gene in vitro.
Jingrui YU ; Yanrong LU ; Wen ZHU ; Yanping WANG ; Xiaohe CHEN ; Cheng YI ; Deyun LUO ; Michael T LOTZE ; Qinghua ZHOU
Chinese Journal of Lung Cancer 2004;7(2):104-107
BACKGROUNDTo construct a DC-Ad-Ki-ras(V12) vaccine and investigate the anti-tumor activities of lung cancer dendritic cell vaccine modified by mutant Ki-ras gene in vitro.
METHODSKi-ras(V12) cDNA was transfected into cultured bone marrow-derived DC with the recombinant adenovirus [(Ad-Ki-ras(V12)] containing human mutant Ki-ras gene. Anti-tumor activity of the vaccine was studied in vitro by flow cytometry, PCR, MLR and cytotoxicity assay.
RESULTS(1) The DC vaccine was confirmed not only to express Ki-ras(V12) gene, but also to remarkably stimulate lymphocyte proliferation and improve CTL activity. (2) The DC vaccine modified by mutant Ki-ras gene could induce specifical CTL activity of immunized mice against Lewis lung carcinoma that could express Ki-ras(V12) gene, but not to B16.
CONCLUSIONSThe DC vaccine modified by mutant Ki-ras gene can induce obvious anti-tumor activities against Lewis lung carcinoma that can express Ki-ras(V12) gene.