Journal
JOURNAL OF IMMUNOLOGY
Volume 182, Issue 4, Pages 2113-2123Publisher
AMER ASSOC IMMUNOLOGISTS
DOI: 10.4049/jimmunol.0802771
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Funding
- British Medical Research Council
- Deutsche Forschungsgemeinschaft [MA 2273/4-2]
- Medical Research Council [G9818340B, G8402371, G0701275] Funding Source: researchfish
- MRC [G8402371, G0701275] Funding Source: UKRI
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IL-6 and APRIL influence the growth, differentiation, and survival of normal and neoplastic Ab-forming cells (AFC). In this study, we identify two subsets of myeloid cells that associate with the AFC and are the main producers of these factors during a T-dependent Ab response to alum-precipitated protein in mouse lymph nodes. First CD11c(+)CD8 alpha(-) dendritic cells located in the perivascular area of the T zone provide about half of the IL-6 mRNA produced in the node together with significant amounts of APRIL mRNA. The number of these cells increases during the response, at least in part due to local proliferation. The second subset comprises Gr1(+)CD11b(+)F4/80(+) monocyte/macrophages. These colonize the medullary cords during the response and are the other main IL-6 mRNA producers and the greatest source of APRIL mRNA. This medullary cord monocyte/macrophage subset results in local increase of APRIL mRNA that mirrors the polarity of CXCL12 expression in the node. The distribution of these myeloid cell subsets correlates with a gradient of AFC maturation assessed by progressive loss of Ki67 as AFC pass from the B cell follicle along the perivascular areas to the medullary cords. The Journal of Immunology, 2009, 182: 2113-2123.
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