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2016 ; 7
(46
): 75293-75306
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Induction of anti-EGFR immune response with mimotopes identified from a phage
display peptide library by panitumumab
#MMPMID27659529
Wang A
; Cui M
; Qu H
; Di J
; Wang Z
; Xing J
; Wu F
; Wu W
; Wang X
; Shen L
; Jiang B
; Su X
Oncotarget
2016[Nov]; 7
(46
): 75293-75306
PMID27659529
show ga
The epidermal growth factor receptor (EGFR) is overexpressed in several
epithelial tumors. Anti-EGFR humanized monoclonal antibodies, cetuximab and
panitumumab, in combination with chemotherapy have improved the prognosis for
patients with wild-type RAS tumors. To identify mimotopes of EGFR and develop
mimotope-based EGFR vaccines, we screened a phage display peptide library with
panitumumab. Two EGFR mimotopes P19 and P26, which could be recognized by
panitumumab specifically, were isolated. To enhance the immune responses, we
generated recombinant proteins of P19 or P26 fused to a heat-shock cognate
protein 70 (Hsc70), and evaluated the efficacy of Hsc70-P19 and Hsc70-P26 as
vaccines in vivo. Immunization with Hsc70-P19 or Hsc70-P26 fusion protein
stimulated the immune system to produce specific antibodies against peptides as
well as EGFR. Moreover, antibodies elicited against mimotopes could induce
antibody-dependent cellular cytotoxicity (ADCC), complement-dependent
cytotoxicity (CDC), and inhibit the proliferation of EGFR-overexpressing A431
cells. Treatment with Hsc70-P19 and Hsc70-P26 significantly reduced tumor growth
in BALB/c transplantable lung cancer models. Although there was no sequence
homology between the phage-derived peptides and EGFR by alignments, both peptides
mimic the conformational structure of EGFR binding to panitumumab. In conclusion,
the mimotopes we identified from phage display peptide library could be promising
candidate vaccines for active anti-EGFR immunotherapy against cancers.