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J Infect Dis. 2014 May 1;209(9):1382-92. doi: 10.1093/infdis/jit576. Epub 2013 Nov 7.

A novel cytomegalovirus-induced regulatory-type T-cell subset increases in size during older life and links virus-specific immunity to vascular pathology.

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1
Division of Medicine.

Abstract

BACKGROUND:

 Cytomegalovirus (CMV) infection directly targets vascular endothelium and smooth muscle and at older ages is associated with accelerated vascular pathology and mortality. CMV-specific cellular immunity might directly contribute to this process.

METHODS:

 Conventional ex vivo activation-induced T-cell responses to 19 dominant CMV antigens, along with CMV-specific inducible regulatory-type CD4+ T cells (iTregs), were measured in healthy older people, using a novel protocol that included classic Treg markers alongside the activation marker CD134. Measurements were correlated with diastolic, systolic, and mean arterial blood pressure, a surrogate marker for arterial stiffness.

RESULTS:

 CMV-specific iTregs recognized the same antigens as conventional CD4+ T cells and were significantly more frequent at older ages. They suppressed antigen-specific and nonspecific proliferation and in large part expressed Foxp3. Frequencies of CMV-specific iTregs and CD8+ T cells (summated response) were significantly associated with diastolic and mean arterial pressures. Confounders, including age, body mass index, smoking, antihypertensive medication use, or C-reactive protein levels, did not explain these observations.

CONCLUSIONS:

 A novel CMV-induced regulatory-type CD4+ T-cell subset is readily detectable in CMV-infected people and, like the aggregate CD8+ T-cell response to the most dominant CMV antigens, is quantitatively associated with arterial stiffness in older life. Whereas CD8+ effector T cells might directly cause vascular injury, iTregs may attenuate this response.

KEYWORDS:

Arteriosclerosis; Regulatory T-Cells; hypertension; iTreg; immunology; infection; inflammation

PMID:
24203779
PMCID:
PMC3982844
DOI:
10.1093/infdis/jit576
[Indexed for MEDLINE]
Free PMC Article
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