Abstract
Objective
We sought to determine the activation status and proliferative capacities of splenic lymphocyte populations from a mevalonate kinase-deficient mouse model of hyper-IgD syndrome (HIDS). We previously reported that murine mevalonate kinase gene ablation was embryonic lethal for homozygous mutants while heterozygotes (Mvk +/−) demonstrated several phenotypic features of human HIDS including increased serum levels of IgD, IgA, and TNFα, temperature dysregulation, hematological abnormalities, and splenomegaly.
Methods and results
Flow cytometric analysis of cell surface activation markers on T and B lymphocytes, and macrophage populations, demonstrated aberrant expression of B7 glycoproteins in all splenic cell types studied. Differences in expression levels between Mvk +/− and Mvk +/+ littermate controls were observed in both the basal state (unstimulated) and after Concanavalin A (Con-A) stimulation in vitro of whole splenocyte cultures. In Mvk +/− CD4 and CD8 T cells, alterations in expression of CD25, CD80, CD152, and CD28 were observed. Mvk +/− splenic macrophages expressed altered levels of CD80, CD86, CD40, and CD11c while Mvk +/− B lymphocytes had differential expression of CD40, CD80, and CD86. Mvk +/− splenocyte subpopulations also exhibited altered proliferative capacities in response to in vitro stimulation.
Conclusion
We postulate that imbalances in the expression of cell surface proteins necessary for activation, proliferation, and regulation of the intensity and duration of an immune response may result in defective T cell activation, proliferation, and effector functions in our model and potentially in human HIDS.
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Abbreviations
- APC:
-
Antigen presenting cell
- CFSE:
-
5-6-carboxyfluorescein diacetate, succinimidyl ester
- Con-A:
-
Concanavalin-A
- GGDP:
-
Geranylgeranyl-diphosphate
- EAE:
-
Experimental autoimmune encephalomyelitis
- Foxp3:
-
Forkhead box P3 transcription factor
- HIDS:
-
Human hyper-IgD syndrome
- IL-:
-
Interleukin-
- MCP-1:
-
Macrophage chemoattractant protein 1
- MFI:
-
Mean fluorescence intensity
- MHC:
-
Major histocompatibility antigen
- MVK:
-
Mevalonate kinase
- NOD:
-
Non-obese diabetic
- TCR:
-
T cell antigen receptor
- TH:
-
T helper cell
- TNF:
-
Tumor necrosis factor
- Treg:
-
Regulatory T cell
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Acknowledgement
The authors would like to thank Sherri Wiseman, Tara Rutledge, and Stephanie Guimond for their excellent technical assistance.
Supported in part by a grant from the Research Advisory Committee (RAC) Children’s Hospital of Pittsburgh, NIH HD57864 (KMG), and the Sterol and Isoprenoid Diseases (STAIR) consortium. STAIR is a part of NIH Rare Diseases Clinical Research Network (RDCRN). Funding and/or programmatic support for this project has been provided by a grant (1U54HD061939) from NICHD and the NIH Office of Rare Diseases Research (ORDR). The views expressed in written materials or publications do not necessarily reflect the official policies of the Department of Health and Human Services nor does mention by trade names commercial practices, or organizations imply endorsement by the U.S. Government.
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Communicated by: Robert Steiner
Competing interest: None declared.
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Hager, E.J., Piganelli, J.D., Tse, H.M. et al. Aberrant expression of costimulatory molecules in splenocytes of the mevalonate kinase-deficient mouse model of human hyper-IgD syndrome (HIDS). J Inherit Metab Dis 35, 159–168 (2012). https://doi.org/10.1007/s10545-011-9349-x
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DOI: https://doi.org/10.1007/s10545-011-9349-x