增殖扩散TCF1+ CD8+ T cells 的可能路径（一）

ICB等T细胞相关免疫治疗遇到的主要难题之一是T Cell Exhaustion T细胞耗竭。

《Intratumoral Tcf1+PD-1+CD8+ T Cells with Stem-like Properties Promote Tumor Control in Response to Vaccination and Checkpoint Blockade Immunotherapy》

# v+ c! ?+ [  q" h4 S. t“Thus, immune checkpoint blockade relies not on reversal of T cell exhaustion programs, but on the proliferation of a stem-like TIL subset.”

* R2 _/ {: N9 u6 qICB免疫治疗与其要靠逆转T细胞耗竭，不如增殖扩散TCF1+ CD8 T细胞。
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, j0 L4 D: l, Z现搜集整理增殖扩散TCF1+ CD8 T细胞的部分途径如下：
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一、表观遗传机制
: G4 N9 ?0 x1 h8 k1、抑制ezh2
$ q* o; O  r; u; K, D: g《Transient EZH2 suppression by Tazemetostat during in vitro expansion maintains T cell stemness and improves adoptive T cell therapy》

* ?; n+ Z, U5 L. Q4 c“Tazemetestat induced T cell epigenetic reprogramming and increased the expression of the self-renewing T cell transcription factor TCF1 by reducing its promoter H3K27 methylation preferentially in rapidly dividing T cells.”

EZH2的靶向药有tazemetostat他泽司他，替代药物有利巴韦林。
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2、抑制lsd1
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+ a9 y2 p- n' Q5 U8 k  j% N《LSD1 inhibition sustains T cell invigoration with a durable response to PD-1 blockade》
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“Here, we demonstrate that histone demethylase LSD1 acts to enforce an epigenetic program in progenitor exhausted CD8+ T cells to antagonize the TCF1-mediated progenitor maintenance and to promote terminal differentiation. Consequently, genetic perturbation or small molecules targeting LSD1 increases the persistence of the progenitor exhausted CD8+ T cells, which provide a sustained source for the proliferative conversion to numerically larger terminally exhausted T cells with tumor-killing cytotoxicity, thereby leading to effective and durable responses to anti-PD1 therapy. ”

LSD1的替代药物有Tranylcypromine。
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6 m- ?, w# v" L3、抑制hdac
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《Tcf1 and Lef1 transcription factors establish CD8(+) T cell identity through intrinsic HDAC activity》

“Tcf1- and Lef1-deficient CD8(+) T cells exhibit histone hyperacetylation, which can be ascribed to intrinsic histone deacetylase (HDAC) activity in Tcf1 and Lef1.”
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4 P, [4 D7 q# }1 U1 q3 YHDAC的靶向药有西达本胺等药物，替代药物有丙戊酸、氟桂利嗪。

# b7 Y0 W/ Q8 E二、抑制AXL

《AXL targeting restores PD-1 blockade sensitivity of STK11/LKB1 mutant NSCLC through expansion of TCF1+ CD8 T cells》
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  l' v- n" [8 Y: L; v“Systemic inhibition of Axl results in increased type I interferon secretion from dendritic cells that expanded tumor-associated TCF1+PD-1+CD8 T cells, restoring therapeutic response to PD-1 ICB in KPL tumors.”
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AXL抑制剂的靶向药有Merestinib梅沙替尼，替代药物有昂丹司琼、吗丁啉。
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% v( {9 R( Y; `; X三、静脉注射连接新抗原肽和Toll样受体7/8激动剂(SNP-7/8a)的纳米颗粒疫苗
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《Intravenous nanoparticle vaccination generates stem-like TCF1+ neoantigen-specific CD8+ T cells》

+ t" A1 z4 b5 I7 [$ _9 C: h3 O+ N“Using a self-assembling nanoparticle vaccine that links neoantigen peptides to a Toll-like receptor 7/8 agonist (SNP-7/8a), we show how the route and dose alter the magnitude and quality of neoantigen-specific CD8+ T cells. Intravenous vaccination (SNP-IV) induced a higher proportion of TCF1+PD-1+CD8+ T cells as compared to subcutaneous immunization (SNP-SC). ”

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3 ]0 o7 _9 e$ h四、抑制nrp1

% [7 {& w6 o" S  ?《Neuropilin-1 is a T cell memory checkpoint limiting long-term antitumor immunity》
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) q$ B* O8 Q2 }' o& z7 Z“Here we report that mice with a CD8+ T cell-restricted neuropilin-1 (NRP1) deletion exhibited substantially enhanced protection from tumor rechallenge and sensitivity to anti-PD1 immunotherapy, despite unchanged primary tumor growth. ”
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Nrp1抑制剂的替代药物有普萘洛尔、艾曲波帕、格列美脲、西格列汀、度他雄胺、溴隐亭。