AUTHOR=Wang Yu-Shan , Liu Shih-Jen , Huang Su-Chen , Chang Chao-Chun , Huang Yi-Chun , Fong Weng-Lam , Chi Mau-Shin , Chi Kwan-Hwa TITLE=Recombinant heat shock protein 70 in combination with radiotherapy as a source of tumor antigens to improve dendritic cell immunotherapy JOURNAL=Frontiers in Oncology VOLUME=2 YEAR=2012 URL=https://www.frontiersin.org/journals/oncology/articles/10.3389/fonc.2012.00149 DOI=10.3389/fonc.2012.00149 ISSN=2234-943X ABSTRACT=

Local radiotherapy (RT) plus intratumoral dendritic cell (DC) injection can mediate immunological response. We hypothesized that co-injection of exogenous recombinant heat shock protein 70 (rHsp70) in combination with RT-DC could be as effective as co-injection of HSP-peptide for evoking specific immune response. rHsp70-prostate-specific antigen (rHSP70C′-PSA) and α-fetoprotein (rHSP70C′-AFP) were used to compare specific response. Growth inhibition of the tumor and the systemic anti-tumor immune response were measured on CT26/PSA and CT26/AFP mice model. Intratumoral co-injection of rHsp70 and DC into the irradiated tumor site induced a more potent anti-tumor immune response than injection of DC alone. rHsp70 was as effective as rHsp70C′-PSA or rHsp70C′-AFP in inducing a tumor-specific cytotoxic T lymphocyte response or tumor growth delay. These results demonstrate that co-administration with rHsp70 and RT could be a simple and effective source of tumor antigens to achieve RT-DC immunotherapy protocol and easy to apply in clinical use.