Administration of MIP-3alpha gene to the tumor following radiation therapy boosts anti-tumor immunity in a murine model of lung carcinoma.

Abstract:

:Dendritic cells (DC), the most potent antigen presenting cells (APC), have been shown able to process apoptotic tumor cells and necrotic tumor cells for antigen presentation. Apoptosis and necrosis are the two common final pathways through which the tumors are killed by chemotherapy or radiation therapy. The tumor cells receiving radiation often produce the "danger signal" cytokines such as TNF-alpha and IL-1. Another cytokine MIP-3alpha that is able to attract DC to the tumor site is normally not secreted. We hypothesize that if artificial introduction of a large number of DC to the necrotic tumor site after radiation therapy by transfecting any cells at the tumor site to secrete DC-tropic MIP-3alpha, an anti-tumor immune response would be initiated. C57BL/6J mice bearing a well-known Lewis lung carcinoma are used to assess efficacy of this modality. The plasmid DNA containing pcDNA3.1/MIP-3alpha was injected into the subcutaneous tumors after radiation treatment. We demonstrate a detectable local expression of MIP-3alpha and local accumulation of DC. Tumor infiltrating lymphocytes after the treatment are predominantly CD8+ T-cells with rare CD4+ T-cells. The anti-tumor immune response was also measurable, which contributes at least in part to the finding that the treated mice have smaller tumor and prolonged survival, comparing to the control groups. This study suggests a potential new means of immune modulation and provides us a new concept of immunotherapy of cancer.

journal_name

Immunol Lett

journal_title

Immunology letters

authors

Zhu B,Zou L,Cheng X,Lin Z,Duan Y,Wu Y,Zhou F,Chen Z

doi

10.1016/j.imlet.2005.09.010

subject

Has Abstract

pub_date

2006-03-15 00:00:00

pages

101-7

issue

2

eissn

0165-2478

issn

1879-0542

pii

S0165-2478(05)00292-0

journal_volume

103

pub_type

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