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Translation is actively regulated during the differentiation of CD8+ effector T cells

Abstract

Translation is a critical process in protein synthesis, but translational regulation in antigen-specific T cells in vivo has not been well defined. Here we have characterized the translatome of virus-specific CD8+ effector T cells (Teff cells) during acute infection of mice with lymphocytic choriomeningitis virus (LCMV). Antigen-specific T cells exerted dynamic translational control of gene expression that correlated with cell proliferation and stimulation via the T cell antigen receptor (TCR). The translation of mRNAs that encode translation machinery, including ribosomal proteins, was upregulated during the T cell clonal-expansion phase, followed by inhibition of the translation of those transcripts when the CD8+ Teff cells stopped dividing just before the contraction phase. That translational suppression was more pronounced in terminal effector cells than in memory precursor cells and was regulated by antigenic stimulation and signals from the kinase mTOR. Our studies show that translation of transcripts encoding ribosomal proteins is regulated during the differentiation of CD8+ Teff cells and might have a role in fate 'decisions' involved in the formation of memory cells.

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Figure 1: Activated CD8+ T cells change their translational activity.
Figure 2: Translation of Ifng in CD8+ Teff cells is distinct from that of Tbx21.
Figure 3: Genome-wide translational activity in CD8+ T cells.
Figure 4: Translatome reveals genes translationally regulated in CD8+ T cells.
Figure 5: Translational regulation links to cellular activity during the differentiation of CD8+ Teff cells.
Figure 6: Translational inhibition of RP mRNAs and 5′ TOP mRNAs occurs in CD8+ Teff cells when the cells stopped dividing just before the contraction phase.
Figure 7: Greater translational inhibition of RP mRNAs in TTE cells than in TMP cells.
Figure 8: Antigen stimulation contributes to translational regulation of RP mRNAs in virus-specific CD8+ T cells.

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Acknowledgements

Supported by the US National Institutes of Health (R01 AI030048 to R.A.) and the Mérieux Foundation (R.A.).

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Authors and Affiliations

Authors

Contributions

K.A. and R.A. designed the experiments and wrote the paper; M.M. and N.S. provided critical guidance for performing the experiments; K.A., A.G.B. and B.T.K. performed the experiments; and K.A., H.T.K. and R.A. analyzed the data.

Corresponding authors

Correspondence to Koichi Araki or Rafi Ahmed.

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Competing interests

The authors declare no competing financial interests.

Integrated supplementary information

Supplementary Figure 1 Translation of mRNAs encoding products involved in the differentiation of effector and memory CD8+ T cells.

qRT-PCR analysis of several transcripts among total mRNA isolated from splenic P14 Tn, D5 Teff, D8 Teff, and Tm cells; results are presented relative to those of total RNA from Tn cells (left). qRT-PCR quantification of several mRNAs in fractions obtained by sucrose-gradient ultracentrifugation of lysates of indicated cells (key), and the proportion of individual mRNAs in the polysome fractions of those cells (right). (a) Cd8a, (b) Il7r and Sell, (c) Gzmb. LCMV specific P14 transgenic CD8+ T cells were adoptively transferred into B6 mice, followed by LCMV Armstrong infection. Tn, D5 Teff, D8 Teff, and Tm indicate naive, day 5 effector, day 8 effector, and memory CD8+ T cells, respectively. The mRNA level in total mRNA and polysome fractions was calculated from the 3-5 independent experiments. Naive P14 cells were obtained from uninfected P14 transgenic mice. Memory P14 cells were analyzed 40~60 days after LCMV infection. Each symbol represents an individual experiment.

Supplementary Figure 2 The majority of transcriptionally upregulated mRNAs encoding products related to cell proliferation in D5 Teff cells are loaded on polysomes.

Microarray analysis was performed as described in Fig. 4a. Correlation of the expression change in total mRNAs with that polysome-associated mRNAs responsible for enrichment data of proliferation related gene sets identified in Fig. 5a Tn vs D5 Teff analysis. Pearson correlation r2 and p-value are shown.

Supplementary Figure 3 Schematic design for identification of translationally regulated genes in D8 Teff cells compared with D5 Teff cells by GSEA using the ImmuneSigDB gene set.

Schematic design showing flow chart for identification of translationally regulated genes in D8 Teff cells compared to D5 Teff cells using ImmuneSigDB gene set.

Supplementary Figure 4 Expression of RP mRNAs per cell in virus-specific CD8+ T cells in total mRNA.

qRT-PCR analysis of ribosomal-protein-encoding mRNA among total mRNA isolated from splenic P14 Tn, D5 Teff, and D8 Teff cells; amount of each mRNA per cell is presented relative to that of total RNA from Tn cells. LCMV specific P14 transgenic CD8+ T cells were adoptively transferred into B6 mice, followed by LCMV Armstrong infection. P14 cells were purified day 5 and day 8 after infection. Naive P14 cells were purified from uninfected P14 transgenic mice. Data were calculated from 3 independent experiments with samples pooled from 3-10 mice per each group. **p<0.01, ***p<0.001, ****p<0.0001 (one-way ANOVA). Each symbol represents an individual experiment.

Supplementary Figure 5 Cd8a mRNA in fractions obtained sucrose-gradient ultracentrifugation of P14 TTE and TMP cells.

(a) Purification methods of CD127hi memory precursor (TMP) and CD127lo terminal effector (TTE) P14 CD8+ T cells from spleen of day 8 LCMV-infected mice in which P14 transgenic T cells were adoptively transferred before infection. (b) qRT-PCR quantification of Cd8a transcripts in fractions (horizontal axes) obtained by sucrose-gradient ultracentrifugation of lysates of P14 CD127hi TMP cells and CD127lo TTE cells (key), among the total in all fractions. This data is control for ribosomal-protein-encoding mRNAs in Fig. 7. Data are representative of six independent experiments with samples pooled from 3-5 mice per each group.

Supplementary Figure 6 Rapamycin inhibits the translation of RP mRNAs in virus-specific CD8+ T cells.

(a and b) Effect of rapamycin on CD127hi memory precursor effector (TMP) cells. (a) Experimental design. LCMV specific P14 transgenic CD8+ T cells were adoptively transferred into B6 mice, followed by LCMV Armstrong infection. Mice were treated or not with rapamycin at day 8 post infection. Twelve hours later, CD127hi TMP P14 effector cells were isolated from spleen for sucrose gradient ultracentrifugation. (b) Proportion of ribosomal-protein-encoding mRNA in polysome fractions of P14 cells obtained from LCMV-infected mice treated or not with rapamycin (key). (c and d) Effect of rapamycin on translational regulation of ribosomal-protein-encoding mRNAs during the early activation of CD8+ T cells. (c) Experimental design. LCMV TCR P14 transgenic mice were treated or not with rapamycin 12 hours before and 12 hours after LCMV infection. Splenic P14 CD8+ T cells were isolated at 24 hours after infection for sucrose gradient ultracentrifugation. (d) Proportion of ribosomal-protein-encoding mRNA in polysome fractions of P14 cells obtained from LCMV-infected mice treated or not with rapamycin (key). Paired data were connected with a solid line in (d). Horizontal doted lines in (b, d) indicate the average percentage of each mRNA in polysome fractions in naive CD8+ T cells (this was calculated from the data of Fig. 6). Data (b) were obtained from six independent experiments with samples pooled from 3-5 mice per each group. Data from five independent experiments were combined in (d). Each symbol in (b,d) represents an individual experiment (b) or an individual mouse (d). *p<0.05, **p<0.01. Unpaired t-test for (b), paired t-test for (d).

Supplementary Figure 7 Translation in effector CD8+ T cells generated in mice infected with either LCMV Arm or LCMV clone 13.

(a) qRT-PCR quantification of Cd8a transcripts in fractions (horizontal axes) obtained by sucrose-gradient ultracentrifugation of lysates of Teff P14 CD8+ cells obtained from spleen of either LCMV Arm- or LCMV clone 13-infected mice (key) at day 8 post-infection. P14 cells were adoptively transferred before infection. This is a control of ribosomal-protein-encoding mRNAs in Fig. 8. (b) Amount of ribosomal-protein-encoding mRNA per cell in polysome fractions of D8 Teff cells obtained from LCMV-Arm- or LCMV-clone 13-infected mice (key); results are presented relative to those of LCMV Arm. Data (a) are representative of 5-6 independent experiments with samples pooled from 3-5 mice per each group. Data (b) were obtained from 5-6 independent experiments with samples pooled from 3-5 mice per each group. ****p<0.0001 (unpaired t-test). Each symbol in (b) represents an individual experiment.

Supplementary information

Supplementary Text and Figures

Supplementary Figures 1–7. (PDF 595 kb)

Supplementary Table 1

Translation activity in naive CD8 T cells. (XLSX 104 kb)

Supplementary Table 2

Translation activity in day 5 effector CD8 T cells. (XLSX 114 kb)

Supplementary Table 3

Translation activity in day 8 effector CD8 T cells. (XLSX 170 kb)

Supplementary Table 4

Translationally regulated genes in day 5 and day 8 effector CD8 T cells compared to naive CD8 T cells. (XLSX 179 kb)

Supplementary Table 5

Fold changes of total and polysome-associated mRNAs responsible for enrichment of proliferation-related gene sets by GSEA. (XLSX 102 kb)

Supplementary Table 6

Genes responsible for translationally regulated gene sets by GSEA in Figure 5. (XLSX 68 kb)

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Araki, K., Morita, M., Bederman, A. et al. Translation is actively regulated during the differentiation of CD8+ effector T cells. Nat Immunol 18, 1046–1057 (2017). https://doi.org/10.1038/ni.3795

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