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Inducible nitric oxide synthase is a major intermediate in signaling pathways for the survival of plasma cells

A Corrigendum to this article was published on 16 January 2015

Abstract

While a number of extrinsic factors are known to promote the survival of plasma cells (PCs), the signaling intermediates involved remain poorly characterized. Here we identified inducible nitric oxide synthase (iNOS) as an intermediate that supported the survival of PCs. PCs deficient in iNOS (Nos2−/− PCs) showed enhanced death in vitro, after transfer into congenic adoptive hosts, and in chimeras made with wild-type and Nos2−/− bone marrow. The iNOS-mediated protection involved activation of protein kinase G and modulation of endoplasmic reticulum stress components. Activation of caspases was also diminished. We found that iNOS was required for PCs to respond to some prosurvival mediators associated with bone marrow stromal cells and that at least one mediator, interleukin 6, fed directly into this pathway by inducing iNOS.

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Figure 1: Deficiency in iNOS enhances the loss of PCs.
Figure 2: Effect of iNOS inhibitors and an NO donor on loss of PCs.
Figure 3: Response of PCs to survival signals.
Figure 4: The prosurvival effect of IL-6 is related to the induction of iNOS and not to expression of the receptor for IL-6 (CD126).
Figure 5: Involvement of PKG downstream of iNOS in promoting PC survival.
Figure 6: Effect of iNOS deficiency on ER-stress components and caspase activation.

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Acknowledgements

We thank R. Kumar for assistance with flow cytometry, and I. Singh for help with breeding and maintenance of mouse strains. Supported by the Department of Biotechnology of the Government of India (BT/PR-14592/BRB/10/858/2010 to S.R.; BT/PR10954/BRB/10/625/2008 and BT/PR12849/MED/15/35/2009 to A.G.; and support for the National Institute of Immunology) and the Department of Science and Technology of the Government of India (SR/SO/HS-0005/2011 to V.B.).

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A.S.S. and G.N.S. did experiments and helped in their design and analysis; A.S.S. contributed to manuscript preparation; and S.R., V.B. and A.G. designed and planned the experiments, analyzed and interpreted data and wrote the manuscript.

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Correspondence to Anna George.

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The authors declare no competing financial interests.

Integrated supplementary information

Supplementary Figure 1 Effect of iNOS deficiency on B cell differentiation.

(a) Frequency of plasma cells 96 h after stimulation of B cells with anti-IgM. Representative of 3 experiments (b) Upregulation of activation markers by wild-type (black) and Nos2−/− (red) B cells stimulated with 10 μg/ml LPS. Dotted lines: unstimulated cells. Shaded histogram: unstained cells. (c) Proliferation of B cells in response to LPS and anti-IgM stimulation for 48 h. Representative of 4 experiments. (d) Identification of plasma cells in bone marrow (BM, representative of 3 plots) and in spleens of mice 96 h after intraperitoneal injection of 50 μg LPS (representative of 15 plots), for sorting. WT: wild-type, KO: Nos2−/−

Source data

Supplementary Figure 2 iNOS deficiency does not affect B cell proliferation.

(a) CFSE dilution profiles of live-gated B cells that were stimulated for 48, 72 or 96 h with 10 μg/ml LPS (representative of 3 independent experiments). (b) Number of cells in each division cycle (mean +/- SE of 3 independent experiments). WT: wild-type, KO: Nos2−/−

Source data

Supplementary Figure 3 iNOS deficiency does not affect B cell differentiation.

Modulation of transcript abundance of genes known to be involved in terminal differentiation of B cells (a) and kinetics of plasma cell generation (b) scored over time following stimulation of IgD+ cells with 10 μg/ml LPS. Fold expression in (a) is calculated relative to wild-type at 0 h. Numbers in (b) represent frequency of plasma cells. Data are mean +/- SE of 3 experiments. WT: wild-type, KO: Nos2−/−

Source data

Supplementary Figure 4 Estimation of plasma cell viability by flow cytometry.

Sort-purified plasma cells from wild-type (WT) and Nos2−/− (KO) mice were cultured in vitro and death estimated over time by Sytox positivity. Data are representative of 2 experiments. Numbers above gates indicate percentage of dead cells.

Supplementary Figure 5 iNOS deficiency does not affect ROS levels or mitochondrial potential during B cell differentiation.

(a) Effect of addition of N-acetyl cysteine on plasma cell frequencies in vitro. Numbers in plots represent frequency. Plots are representative of 2 experiments (b) Estimation of intracellular ROS levels in wild-type (black line) and Nos2−/− (red line) plasma cells. Shaded histogram: Unstained cells. Data are representative of 3 experiments (c) Estimation of mitochondrial mass and potential in wild-type (WT) and Nos2−/− (KO) plasma cells. Data are representative of 5 experiments.

Supplementary Figure 6 Activated caspases in live-gated B220loCD138+ cells following stimulation of wild-type (WT) and Nos2−/− (KO) splenocytes with 10 μg/ml LPS for 96 h.

Plots are representative of 4 experiments. Numbers above gates indicate the proportion of cells expressing activated caspases.

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Supplementary Figures 1–6 (PDF 10487 kb)

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Saini, A., Shenoy, G., Rath, S. et al. Inducible nitric oxide synthase is a major intermediate in signaling pathways for the survival of plasma cells. Nat Immunol 15, 275–282 (2014). https://doi.org/10.1038/ni.2806

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