Human Cytomegalovirus-Encoded Human Interleukin-10 (IL-10) Homolog Amplifies Its Immunomodulatory Potential by Upregulating Human IL-10 in Monocytes

Journal of Virology
Selmir AvdicBarry Slobedman

Abstract

The human cytomegalovirus (HCMV) gene UL111A encodes cytomegalovirus-encoded human interleukin-10 (cmvIL-10), a homolog of the potent immunomodulatory cytokine human interleukin 10 (hIL-10). This viral homolog exhibits a range of immunomodulatory functions, including suppression of proinflammatory cytokine production and dendritic cell (DC) maturation, as well as inhibition of major histocompatibility complex (MHC) class I and class II. Here, we present data showing that cmvIL-10 upregulates hIL-10, and we identify CD14(+)monocytes and monocyte-derived macrophages and DCs as major sources of hIL-10 secretion in response to cmvIL-10. Monocyte activation was not a prerequisite for cmvIL-10-mediated upregulation of hIL-10, which was dose dependent and controlled at the transcriptional level. Furthermore, cmvIL-10 upregulated expression of tumor progression locus 2 (TPL2), which is a regulator of the positive hIL-10 feedback loop, whereas expression of a negative regulator of the hIL-10 feedback loop, dual-specificity phosphatase 1 (DUSP1), remained unchanged. Engagement of the hIL-10 receptor (hIL-10R) by cmvIL-10 led to upregulation of heme oxygenase 1 (HO-1), an enzyme linked with suppression of inflammatory responses, and this ...Continue Reading

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