T cells and transferred these cells or control OT-1 CD8+T cells
into wild-type (WT) mice bearing MC38-Ova tumors. Recipients
of MT-OT1 CD8+T cells failed to exhibit tumor growth control
compared to recipients of control OT-1 CD8+T cells (Figure 2C).
Indeed, tumor growth in recipients of MT-OT1 CD8+T cells
resembled that of mice that did not receive any tumor-antigen-
specific CD8+T cells. These results indicate a CD8+T cell
intrinsic role of MT. Taken together, our data support that
expression of metallothioneins in CD8+T cells plays a critical
role in suppressing anti-tumor CD8+T cell responses.
C1
C2
C10
C7
C5
C6
C3
3031
genes
C4
C8
C9
C1
C2
C10
C7
C5
C6
C3
C4
C8
C9
Naïve EffMem
DN SP DP
–3 –1 1 2 3
AB
CD
z-score
Centered intensity
–4 –2 0 2 4
CD8 in vivo
activation
LCMV
exhaustion
TBX21KIT
D630039A03RIKGEM
CREB3L2FASL
ITGA1
CD244.LOC677008CD81
SERPINA3G
C1QTNF6CCRL2
TNFRSF9
ARSBTOX
CDKN2B
PLSCR1CSF1
CDKN3
OSBPL3NRN1
DUSP4
SERPINE2GZMC
MT1
Tumor
dissociation
CD8+
Tim3+ PD1+
Tim3+PD1+
Tim3– PD1+
Tim3–PD1+
Tim3– PD1–
Tim3–PD1–
Naïve EffMem DN SP DP
Function
Rank
Implant
carcinoma
2–3 weeks
024
–Log 10 (p-value)
Significance threshold
Figure 1. CD8+T Cell Dysfunction and Activation Are Transcriptionally Intertwined
(A) Outline of experimental strategy. CT26 colon carcinoma was used.
(B) Heatmap of the 3,031 differentially expressed genes across the TIL subpopulations. Naive: CD8+CD62LhiCD44lowcells from non-tumor-bearing Balb/c mice;
EffMem: effector memory CD8+CD62LlowCD44hicells from non-tumor-bearing Balb/c mice; DN: CD8+Tim3PD1; SP: CD8+Tim3PD1+; DP: CD8+Tim3+PD1+
TILs from CT26 colon carcinoma.
(C) Cluster 2 is significantly enriched with genes upregulated in a CD8+viral exhaustion signature (Doering et al., 2012), as well as an in vivo CD8+activation
signature (Sarkar et al., 2008). p values determined by hypergeometric test.
(D) Heatmap of the top-ranking genes from cluster 2.
See alsoFigure S1andTables S1andS2.
1502 Cell 166 , 1500–1511, September 8, 2016