CXCR4/IgG-expressing plasma cells are associated with human gastrointestinal tissue inflammation - 29/05/14
, Lela Kardava, PhD a, Jason Ho, PhD a, Brian H. Santich, BA a, Leo Jin Young Kim, BA a, Emily K. Funk, BA a, Amy K. Nelson, BSN a, Britanny Winckler, BA b, Cheryl L. Chairez, BSN a, Narda L. Theobald-Whiting, BS b, Sandra Anaya-O’Brien, MSN b, Meghna Alimchandani, MD c, Martha M. Quezado, MD c, Michael D. Yao, MD b, Joseph A. Kovacs, MD d, Tae-Wook Chun, PhD a, Anthony S. Fauci, MD a, Harry L. Malech, MD b, Suk See De Ravin, MD, PhD b, ⁎ 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.
Le texte complet de cet article est disponible en PDF.Key words : Plasma cells, primary and infectious immunodeficiencies, gastrointestinal inflammation, inflammatory bowel disease, homing receptors
Abbreviations used : APC, CD, CGD, DAPI, HD, IBD, MFI, PC, PE, UC
Plan
| Supported by the Intramural Research Program of the National Institute of Allergy and Infectious Diseases, National Institutes of Health. |
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| Disclosure of potential conflict of interest: The authors declare that they have no relevant conflicts of interest. |
Vol 133 - N° 6
P. 1676 - juin 2014 Retour au numéro
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