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J Allergy Clin Immunol. 2014 Jun;133(6):1676-85.e5. doi: 10.1016/j.jaci.2013.10.050. Epub 2013 Dec 25.

CXCR4/IgG-expressing plasma cells are associated with human gastrointestinal tissue inflammation.

Author information

1
Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, Bethesda, Md.
2
Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, Bethesda, Md. Electronic address: smoir@niaid.nih.gov.
3
Laboratory of Host Defenses, National Institute of Allergy and Infectious Diseases, Bethesda, Md.
4
Laboratory of Pathology, National Cancer Institute, Bethesda, Md.
5
Critical Care Medicine, National Institutes of Health Clinical Center, Bethesda, Md.
6
Laboratory of Host Defenses, National Institute of Allergy and Infectious Diseases, Bethesda, Md. Electronic address: sderavin@niaid.nih.gov.

Abstract

BACKGROUND:

We previously reported abnormalities in circulating B cells in patients with chronic granulomatous disease (CGD) and those with HIV infection. Gastrointestinal complications are common to both diseases and likely involve perturbation of immune cells, including plasma cells (PCs). IgA is the most abundant immunoglobulin in the human body, with roles in protection and maintenance of intestinal homeostasis. IgA is produced primarily by PCs residing in mucosal tissues that are also thought to circulate in the blood.

OBJECTIVE:

We sought to characterize and compare PCs in patients with infectious (HIV) and noninfectious (CGD and Crohn disease) diseases that have been associated with intestinal inflammation.

METHODS:

Phenotypic and transcriptional analyses were performed on cells isolated from the blood and colon.

RESULTS:

IgA-secreting CCR10-expressing PCs predominated in the guts of healthy subjects, whereas in patients with HIV, CGD, and Crohn disease, there was a significant increase in the proportion of IgG-secreting PCs. Where intestinal inflammation was present, IgG-secreting PCs expressed reduced levels of CCR10 and increased levels of CXCR4. The intensity of CXCR4 expression correlated with the frequency of IgG-expressing PCs and the frequency of CXCR4(+)/IgG(+) PCs was associated with the severity of intestinal inflammatory disease yet distinct from PCs and plasmablasts circulating in the blood.

CONCLUSIONS:

These findings suggest that regardless of the underlying disease, the presence of CXCR4(+)/IgG(+) PCs in the gut is a strong yet localized indicator of intestinal inflammation. Furthermore, our findings suggest that CXCR4(+)/IgG(+) PCs might play a role in immune cell homeostasis during inflammatory processes of the gut.

KEYWORDS:

Plasma cells; gastrointestinal inflammation; homing receptors; inflammatory bowel disease; primary and infectious immunodeficiencies

PMID:
24373354
PMCID:
PMC4040303
DOI:
10.1016/j.jaci.2013.10.050
[Indexed for MEDLINE]
Free PMC Article

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