Abstract
Patients with Down syndrome (DS) are characterized by increased susceptibility to autoimmunity and respiratory tract infections that are suggestive of humoral immunity impairment. Here, we sought to determine the follicular helper (Tfh) and follicular regulatory (Tfr) T cell profile in the blood of children with DS. Blood was collected from 24 children with DS, nine of which had autoimmune diseases. Children with DS showed skewed Tfh differentiation towards the CXCR3+ phenotype: Tfh1 and Tfh1/17 subsets were increased, while Tfh2 and Tfh17 subsets were reduced. While no differences in the percentage of Tfr cells were seen, the ratio of Tfh1 and CXCR3+PD-1+ subsets to Tfr cells was significantly increased in the affected children. The excessive polarization towards a CXCR3+ phenotype in children with DS suggests that re-calibration of Tfh subset skewing could potentially offer new therapeutic opportunities for these patients.
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Abbreviations
- DS:
-
Down syndrome
- AI:
-
Autoimmune
- Tfh:
-
Follicular T helper cell
- Tfr:
-
Follicular T regulatory cell
- Treg:
-
Regulatory T cell
- GC:
-
Germinal center
- FOXP3:
-
Forkhead box P3
- CCR6:
-
Chemokine receptor 6
- CVID:
-
Common variable immunodeficiency
- CXCL13:
-
CXC motif chemokine ligand 13
- CXCR3:
-
C-X-C motif chemokine receptor 3
- CXCR5:
-
C-X-C motif chemokine receptor 5
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Acknowledgments
We thank patients and parents for their participation in this study.
Funding
This work was supported with funds from OSR Pilot & Seed Grant to MPC and GF and the Italian Ministry of Health Young Researchers Award (GR-2011-02348732) to GF.
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JG, PDL, AV, and TJ performed experiments and analyzed data. MS and MM provided samples, analyzed data, and corrected the manuscript. MA, CT, MDP, and AA provided samples and corrected the manuscript. GO, MPC, and GF analyzed data and wrote the manuscript. All authors reviewed and approved the manuscript.
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Fig. S1
Immunoglobulin levels and lymphocyte counts in children with Down syndrome. Panel a represents the distribution of IgG (A), IgM (B) and IgA (C) values in DS children (n = 24) according to age. Dashed lines represent +2SD and -2SD normal range limits for age. Panel b shows the comparison of the total CD3+CD4+ between DS children (n = 24) and HD (n = 30). Panel c shows the distribution of CD19+ B cells in DS children according to age. Dashed line represents +2 standard deviation (SD) and -2SD from normal range limit for age [37, 38]. (PPTX 89 kb)
Fig. S2
Gating strategy for Tfh (CXCR5+FOXP3−), Tfr (CXCR5+FOXP3+), CXCR5− Treg (CXCR5−FOXP3+). Arrows indicate gating strategy: singlets → lymphocytes → CD3+CD19−CD14−CD8− → CD3+CD4+. (PPTX 124 kb)
Fig. S3
Gating strategy for Tfh1 (CCR6−CXCR3+), Tfh2 (CCR6−CXCR3−), Tfh17 (CCR6+CXCR3−), Tfh1/17 (CCR6+CXCR3+) and CXCR3-PD-1+ and CXCR3+PD-1+. Arrows indicate gating strategy: singlets → lymphocytes →CD3+CD4+ → CD4+CXCR5+. (PPTX 123 kb)
Fig. S4
Tfh subset and Tfr cell ratios in DS children. Panel a shows (Tfh2 + Tfh17):Tfh1 ratio in HD and DS children. b. Ratios Tfh1:Tfr and Tfh1/17:Tfr in HD and DS children. Each dot represents one patient. Asterisks indicate statistical significance calculated by Mann Whitney test. **p < 0.01; ****p < 0.0001 (PPTX 64 kb)
Fig. S5
Tfh subsets in DS children with or without autoimmunity. Panel a shows the frequencies of Tfh1, Tfh2, Tfh17, Tfh1/17 in DS children without autoimmunity (n = 15) and DS children with autoimmunity (n = 9) compared to age-matched HD (n = 30). b. (Tfh2 + Tfh17):Tfh1 ratio in HD and DS children with or without autoimmunity. c. Ratios Tfh1:Tfr and Tfh1/17:Tfr in HD and DS children with or without autoimmunity. Each dot represents one patient. Asterisks indicate statistical significance calculated by Mann Whitney test. *p < 0.05; **p < 0.01; ***p < 0.001; ****p < 0.0001. (PPTX 122 kb)
Fig. S6
The proportions of CXCR3−PD-1+ and CXCR3+PD-1+ Tfh cells in DS children with or without autoimmunity. Panel a shows the percentage of CXCR3−PD-1+ and CXCR3+PD-1+ in peripheral blood of DS children without autoimmunity (n = 15) and DS children with autoimmunity (n = 9) compared to age-matched HD. Panel b shows ratio CXCR3+PD1+: Tfr in DS children with or without autoimmunity as compared to age-matched HD. Panel c represents CXCL13 levels in the plasma of DS children with autoimmunity vs. DS children without autoimmunity and age-matched HD. Each dot represents one patient. Asterisks indicate statistical significance as calculated by Mann Whitney test. *p < 0.05; **p < 0.01. (PPTX 90 kb)
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Ottaviano, G., Gerosa, J., Santini, M. et al. A Prevalent CXCR3+ Phenotype of Circulating Follicular Helper T Cells Indicates Humoral Dysregulation in Children with Down Syndrome. J Clin Immunol 40, 447–455 (2020). https://doi.org/10.1007/s10875-020-00755-0
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DOI: https://doi.org/10.1007/s10875-020-00755-0