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2014 ; 60
(5
): 1551-62
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Breadth of neutralization and synergy of clinically relevant human monoclonal
antibodies against HCV genotypes 1a, 1b, 2a, 2b, 2c, and 3a
#MMPMID25043937
Carlsen TH
; Pedersen J
; Prentoe JC
; Giang E
; Keck ZY
; Mikkelsen LS
; Law M
; Foung SK
; Bukh J
Hepatology
2014[Nov]; 60
(5
): 1551-62
PMID25043937
show ga
Human monoclonal antibodies (HMAbs) with neutralizing capabilities constitute
potential immune-based treatments or prophylaxis against hepatitis C virus (HCV).
However, lack of cell culture-derived HCV (HCVcc) harboring authentic envelope
proteins (E1/E2) has hindered neutralization investigations across genotypes,
subtypes, and isolates. We investigated the breadth of neutralization of 10 HMAbs
with therapeutic potential against a panel of 16 JFH1-based HCVcc-expressing
patient-derived Core-NS2 from genotypes 1a (strains H77, TN, and DH6), 1b (J4,
DH1, and DH5), 2a (J6, JFH1, and T9), 2b (J8, DH8, and DH10), 2c (S83), and 3a
(S52, DBN, and DH11). Virus stocks used for in vitro neutralization analysis
contained authentic E1/E2, with the exception of full-length JFH1 that acquired
the N417S substitution in E2. The 50% inhibition concentration (IC50) for each
HMAb against the HCVcc panel was determined by dose-response neutralization
assays in Huh7.5 cells with antibody concentrations ranging from 0.0012 to 100
?g/mL. Interestingly, IC50 values against the different HCVcc's exhibited large
variations among the HMAbs, and only three HMAbs (HC-1AM, HC84.24, and AR4A)
neutralized all 16 HCVcc recombinants. Furthermore, the IC50 values for a given
HMAb varied greatly with the HCVcc strain, which supports the use of a diverse
virus panel. In cooperation analyses, HMAbs HC84.24, AR3A, and, especially
HC84.26, demonstrated synergistic effects towards the majority of the HCVcc's
when combined individually with AR4A. CONCLUSION: Through a neutralization
analysis of 10 clinically relevant HMAbs against 16 JFH1-based Core-NS2
recombinants from genotypes 1a, 1b, 2a, 2b, 2c, and 3a, we identified at least
three HMAbs with potent and broad neutralization potential. The neutralization
synergism obtained when pooling the most potent HMAbs could have significant
implications for developing novel strategies to treat and control HCV.