在查T細(xì)胞的細(xì)致分群的資料中婿牍,流式中文網(wǎng)T細(xì)胞一篇解釋的非常全面。T細(xì)胞接受抗原刺激后的五個階段及其表型[T細(xì)胞接受抗原刺激后的五個階段及其表型].
我根據(jù)我自己的理解羹饰,寫一篇讀書筆記。
1. T細(xì)胞在接受抗原遞呈細(xì)胞的呈遞后忍坷,在接受抗原刺激后穆桂,會改變自己的狀態(tài),這是一個動態(tài)的而且有一定方向盏浙。
Figure 1 Following antigen exposure, na? ?ve T cells undergo proliferative expansion and differentiate into memory T-cell subsets, which culminate into terminally differentiated effector T cells. A majority of memory T cells will survive the contraction phase and become long-lived memory T cells, which have the ability to acquire effector functions upon antigen re-exposure. APC, antigen-presenting cell.
2.有一些marker可以表征這種動態(tài)變化過程
根據(jù)表型眉睹,功能及轉(zhuǎn)錄因子,目前CD8+T細(xì)胞可以進(jìn)一步分為以下不同的亞群:
- Tnaive CD44-CD62+
- T SCM :干細(xì)胞記憶T細(xì)胞(Stem cell memory T cell)
- T EM:效應(yīng)記憶T細(xì)胞(Effector memory T Cell):CD44+CD62L-
- T CM:中樞記憶T細(xì)胞(Central memory T Cell):CD44+CD62L+
- T pm:外周記憶T細(xì)胞(Peripheral Memory T Cell)
- T RM:組織駐留記憶T細(xì)胞(Tissue Resident Memory)
TRM也是一個異質(zhì)性群體废膘,除了CD69竹海,CD103,CXCR6等共有標(biāo)志物之外丐黄,根據(jù)其他標(biāo)志物斋配,可以將TRM至少分為三群
- Hobit-enriched CD103hi PD1lo,
- Granzyme K-enriched CD103lo PD1hi,
- CD103hi PD1hi CTLAhi LAG3hi TIGIThi(耗竭表型)
3.伴隨著變化,其中發(fā)揮效應(yīng)的功能分子也會變化
4.丟了一些灌闺,得到了一些
Tn和TCM均表達(dá)CD62L(L選擇素艰争,屬于淋巴結(jié)歸巢受體)和CCR7(趨化因子受體7),所以它們大多聚集在次級淋巴器官菩鲜,而TEM和TE則缺失這兩種分子园细,因此他們大多存在于外周血。
TCM和TEM之間接校,細(xì)胞因子分泌不同猛频,TCM的增殖能力強(qiáng),IL-2分泌能力強(qiáng)蛛勉,而TEM則分泌效應(yīng)因子鹿寻,例如IFN-γ和IL-4。
5.如何在自己課題中表征這種變化
推薦其采用的方案是CD3诽凌、CD4毡熏、CD8、CD45RA侣诵、CCR7痢法、CD45RO。當(dāng)然杜顺,大家也可以根據(jù)自己的喜好選擇增加其它標(biāo)記财搁,例如CD62L、CD95等躬络。
參考資料:
- T細(xì)胞亞群細(xì)分標(biāo)記
- T細(xì)胞接受抗原刺激后的五個階段及其表型
- T細(xì)胞耗竭四階段
- Flynn, J. K. & Gorry, P. R. Stem memory T cells (TSCM)—their role in cancer and HIV immunotherapies. Clin Trans Immunol 3, e20 (2014).
- Larbi, A. & Fulop, T. From “truly na?ve” to “exhausted senescent” T cells: When markers predict functionality: From “Truly Na?ve” to “Exhausted Senescent” T Cells. Cytometry 85, 25–35 (2014).