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2017 ; 66
(1
): 57-68
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Immune phenotype and function of natural killer and T cells in chronic hepatitis
C patients who received a single dose of anti-MicroRNA-122, RG-101
#MMPMID28295463
Stelma F
; van der Ree MH
; Sinnige MJ
; Brown A
; Swadling L
; de Vree JML
; Willemse SB
; van der Valk M
; Grint P
; Neben S
; Klenerman P
; Barnes E
; Kootstra NA
; Reesink HW
Hepatology
2017[Jul]; 66
(1
): 57-68
PMID28295463
show ga
MicroRNA-122 is an important host factor for the hepatitis C virus (HCV).
Treatment with RG-101, an N-acetylgalactosamine-conjugated anti-microRNA-122
oligonucleotide, resulted in a significant viral load reduction in patients with
chronic HCV infection. Here, we analyzed the effects of RG-101 therapy on
antiviral immunity. Thirty-two chronic HCV patients infected with HCV genotypes
1, 3, and 4 received a single subcutaneous administration of RG-101 at 2 mg/kg (n
= 14) or 4 mg/kg (n = 14) or received a placebo (n = 2/dosing group). Plasma and
peripheral blood mononuclear cells were collected at multiple time points, and
comprehensive immunological analyses were performed. Following RG-101
administration, HCV RNA declined in all patients (mean decline at week 2, 3.27
log10 IU/mL). At week 8 HCV RNA was undetectable in 15/28 patients. Plasma
interferon-?-induced protein 10 (IP-10) levels declined significantly upon dosing
with RG-101. Furthermore, the frequency of natural killer (NK) cells increased,
the proportion of NK cells expressing activating receptors normalized, and NK
cell interferon-? production decreased after RG-101 dosing. Functional
HCV-specific interferon-? T-cell responses did not significantly change in
patients who had undetectable HCV RNA levels by week 8 post-RG-101 injection. No
increase in the magnitude of HCV-specific T-cell responses was observed at later
time points, including 3 patients who were HCV RNA-negative 76 weeks postdosing.
CONCLUSION: Dosing with RG-101 is associated with a restoration of NK-cell
proportions and a decrease of NK cells expressing activation receptors; however,
the magnitude and functionality of ex vivo HCV-specific T-cell responses did not
increase following RG-101 injection, suggesting that NK cells, but not HCV
adaptive immunity, may contribute to HCV viral control following RG-101 therapy.
(Hepatology 2017;66:57-68).