Abstract | BACKGROUND: METHODS: A chemically-induced lung tumor model was developed in hMUC1.Tg C57BL/6 mice by administering 10 weekly 0.75-mg/g doses of the chemical carcinogen urethane by intraperitoneal injection. Serum cytokines associated with Th1/Th2 polarization and inflammation were measured by multiplex cytokine assay during tumorigenesis. Antitumor activity of L-BLP25 (10 μg) with CPA (100 mg/kg) pretreatment was evaluated following either one or two eight-week cycles of treatment by preparing lung whole mounts and counting tumor foci, and assessing IFN-γ production by ELISpot assay. RESULTS: During the carcinogenesis phase, no detectable Th1- or Th2-associated cytokine responses were observed, but levels of pro-inflammatory cytokines were increased with distinctive kinetics. A single cycle of L-BLP25 consisting of eight weekly doses was ineffective, whereas adding a second cycle given during tumor progression showed a significant reduction in the incidence of tumor foci. Administering two cycles of L-BLP25 induced Th1 cytokines IL-12, IL-2 and IFNγ at 24 h after the last dose, while Th2 and inflammatory cytokines were elevated to a lesser extent. CONCLUSIONS:
Urethane-induced lung tumors in hMUC1.Tg mice can be used as a model to assess the efficacy of the MUC1 antigen-specific cancer immunotherapeutic agent L-BLP25. The results indicate that the antitumor response to L-BLP25 requires at least two cycles and pre-treatment with CPA. In addition, monitoring pro-inflammatory serum cytokines may be useful as a biomarker of L-BLP25 response. Taken together, the preclinical lung tumor model can be utilized for determining effective combinations of L-BLP25 with chemotherapy and/or other immunotherapies.
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Authors | Gregory T Wurz, Audrey M Gutierrez, Brittany E Greenberg, Daniel P Vang, Stephen M Griffey, Chiao-Jung Kao, Michael Wolf, Michael W DeGregorio |
Journal | Journal of translational medicine
(J Transl Med)
Vol. 11
Pg. 64
(Mar 13 2013)
ISSN: 1479-5876 [Electronic] England |
PMID | 23496860
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Antigens, Neoplasm
- Cancer Vaccines
- Cytokines
- Inflammation Mediators
- L-BLP25
- Membrane Glycoproteins
- Mucin-1
- Urethane
- Cyclophosphamide
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Topics |
- Adenoma
(drug therapy, immunology, pathology, therapy)
- Animals
- Antigens, Neoplasm
(immunology)
- Cancer Vaccines
(immunology)
- Carcinogenesis
(pathology)
- Cyclophosphamide
(pharmacology, therapeutic use)
- Cytokines
(metabolism)
- Disease Models, Animal
- Dose-Response Relationship, Drug
- Humans
- Immunity
(drug effects)
- Immunotherapy
- Inflammation Mediators
(metabolism)
- Lung Neoplasms
(drug therapy, immunology, pathology, therapy)
- Membrane Glycoproteins
(immunology)
- Mice, Inbred C57BL
- Mice, Transgenic
- Mucin-1
(immunology)
- Th1 Cells
(drug effects, immunology)
- Time Factors
- Urethane
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