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Human herpesvirus 6 impairs differentiation of monocytes to dendritic cells.

Abstract：

OBJECTIVE:Monocyte-derived dendritic cells (DCs) play important roles in the immune response against infections and malignancies. Human herpesvirus 6 (HHV-6) infects monocytes and is reactivated in immunodeficient patients. To clarify the mechanisms of HHV-6-induced immunodeficiency, we investigated the effect of HHV-6 infection on differentiation of monocytes to DCs. METHODS:Monocytes were inoculated with or without HHV-6 and then allowed to differentiate to myeloid DCs in culture medium containing granulocyte-macrophage colony-stimulating factor and interleukin (IL)-4. The expression of cell surface molecules on DCs and the capacity of the DCs for antigen capture were examined by flow cytometric analysis. Alteration of antigen-presenting capacity induced by HHV-6 infection was examined. RESULTS:The morphology of HHV-6-infected monocyte-derived DCs was distinctly different from that of the DCs derived from mock-infected monocytes. Although expression levels of DC-associated surface antigens, including CD80, CD83, and CD86, were significantly higher on HHV-6-infected monocyte-derived DCs than on DCs derived from mock-infected monocytes, antigen-presenting capacity was significantly lower in the former group. Addition of culture supernatant of HHV-6-infected monocytes resulted in suppression of the T-lymphocyte proliferative response, and anti-IL-10 neutralizing antibody partly inhibited this suppressive effect. The antigen-presenting capacity of DCs generated from a patient with severe HHV-6 reactivation was significantly lower than that of DCs generated from the same patient in the recovery phase. CONCLUSIONS:HHV-6 infection induces immunodeficiency via impaired differentiation of DCs. These results present a new concept for the pathogenesis of HHV-6-induced immunodeficiency.

journal_name

Exp Hematol

journal_title

Experimental hematology

authors

Niiya H,Lei J,Guo Y,Azuma T,Yakushijin Y,Sakai I,Hato T,Tohyama M,Hashimoto K,Yasukawa M

doi

10.1016/j.exphem.2006.02.001

subject

Has Abstract

pub_date

2006-05-01 00:00:00

pages

642-53

issue

5

eissn

0301-472X

issn

1873-2399

pii

S0301-472X(06)00064-6

journal_volume

34

pub_type

杂志文章

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