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J Gastroenterol. 2011 Feb;46(2):232-41. doi: 10.1007/s00535-010-0297-2. Epub 2010 Aug 17.

Lymphotropic HCV strain can infect human primary naïve CD4+ cells and affect their proliferation and IFN-γ secretion activity.

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  • 1Division of Gastroenterology, Tohoku University Graduate School of Medicine, 1-1 Seiryo, Aobaku, Sendai 980-8574, Japan.

Abstract

BACKGROUND:

Lymphotropic hepatitis C virus (HCV) infection of B and T cells might play an important role in the pathogenesis of hepatitis C. Recently, we showed that a lymphotropic HCV (SB strain) could infect established T-cell lines and B-cell lines. However, whether HCV replication interferes with cell proliferation and function in primary T lymphocytes is still unclear.

AIM:

The aim of this study was to analyze whether HCV replication in primary T lymphocytes affected their development, proliferation, and Th1 commitment.

METHODS:

SB strain cell culture supernatant (2 × 10(4) copies/ml HCV) was used to infect several kinds of primary lymphocyte subsets. Mock, UV-irradiated SB-HCV, JFH-1 strain, and JFH-1 NS5B mutant, which could not replicate in T cells, were included as negative controls. Carboxyfluorescein succinimidyl ester (CFSE) and CD45RA double staining was used to evaluate the proliferative activity of CD4(+)CD45RA(+)CD45RO(-) naïve CD4(+) cells. Interferon (IFN)-γ and interleukin (IL)-10 secretion assays magnetic cell sorting (MACS) were carried out.

RESULTS:

Negative strand HCV RNA was detected in CD4(+), CD14(+), and CD19(+) cells. Among CD4(+) cells, CD4(+)CD45RA(+)RO(-) cells (naïve CD4(+) cells) were most susceptible to replication of the SB strain. The levels of CFSE and CD45RA expression gradually declined during cell division in uninfected cells, while HCV-infected naïve CD4(+) cells expressed higher levels of CFSE and CD45RA than Mock or UV-SB infected naïve CD4(+) cells. Moreover, the production of IFN-γ was significantly suppressed in SB-infected naïve CD4(+) cells.

CONCLUSIONS:

Lymphotropic HCV replication suppressed proliferation and development, including that towards Th1 commitment, in human primary naïve CD4(+) cells.

PMID:
20714907
[PubMed - indexed for MEDLINE]
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