Strong humoral response elicited by a DNA vaccine targeting gastrin-releasing peptide with optimized adjuvants inhibits murine prostate carcinoma growth in vivo.
|
| Abstract |
Previous studies demonstrated that the elevated expression and receptor binding of gastrin-releasing peptide (GRP) in various types of cancer suggest that GRP might be a putative target for immunotherapy in neoplastic diseases. DNA vaccine for hormone/growth factor immune deprivation represents a feasible and attractive approach for cancer treatment; nevertheless, there is still a need to increase the potency of the DNA vaccine. Here, based on six copies of the B cell epitope GRP(18-27) in a linear alignment as an immunogen, we designed several anti-GRP DNA vaccines containing different combinations of immunoadjuvants, such as HSP65, tetanus toxoid(830-844) (T), pan HLA-DR-binding epitope (PADRE) (P), and mycobacterial HSP70(407-426) (M), on a backbone of pCR3.1 plasmid vector with eight 5'-GACGTT-3' CpG motifs and the VEGF183 signal peptide (VS). The effects of these immunoadjuvants in enhancing GRP-specific humoral immune response were then evaluated by comparing the respective immunogenicity and antitumor effects. Immunization of mice with pCR3.1-VS-HSP65-TP-GRP6-M2 elicited much higher levels of specific anti-GRP antibodies and more effectively inhibited the growth of a GRP-dependent tumor RM-1 in vivo. Interestingly, plasmids encoding for 2HSP70(407-426), but not the one with 1 or 3HSP70(407-426) showed stronger immune stimulatory potential as well as impressive antitumor activity, suggesting that 2HSP70(407-426) is an efficient molecular adjuvant for developing self-epitope vaccines. The highly immunogenic, potent anti-tumorigenic and antiangiogenesis activities of the anti-GRP DNA vaccine offered a novel immunotherapeutic approach in the treatment of GRP-dependent tumors and their complications.
|
|---|---|
| Authors | Yong Lu, Didier J L Mekoo, Kedong Ouyang, Xiangbing Hu, Yanhua Liu, Ming Lin, Liang Jin, Rongyue Cao, Taiming Li, Yankai Zhang, Hao Fan, Jingjing Liu |
| Journal | Endocrine-related cancer (Endocr Relat Cancer) Vol. 16 Issue 4 Pg. 1171-84 (Dec 2009) ISSN: 1479-6821 [Electronic] England |
| PMID | 19648182 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't) |
| Chemical References |
|
| Topics |
|
Join CureHunter, for free Research Interface BASIC access!
Realize the full power of the drug-disease research graph!