調節性T細胞（regulatory T，Treg）是一類控制體內免疫反應性的T細胞亞群，根據來源的不同，Treg 細胞可分為自然性Treg (natural Treg, nTreg) 和誘導性 Treg（induced Treg, iTreg）。

       nTreg由胸腺分化而來，占外周血CD4+ T細胞的5%~10%，這類細胞本身缺乏增殖能力，但具有天然免疫抑制作用，不僅可抑制CD4+或CD8+ T細胞的活化和增殖，還可抑制初始T細胞和記憶性T細胞的功能。iTreg主要存在于外周血和腫瘤組織中，由抗原或抑制性因子如IL-2、TGF-β刺激初始CD4+ T細胞產生，對多種免疫細胞具有抑制作用。

       調節性T（regulatoryT，Treg）細胞對于調節免疫穩態和抑制不同疾病環境中的免疫反應具有至關重要的作用，它能通過抑制CD4+輔助性T細胞和CD8+細胞毒性T細胞的激活和分化，對自體和腫瘤表達的抗原產生反應性。Treg細胞表達特異性轉錄因子Foxp3，因而，CD4+CD25+Foxp3+被認為是Treg細胞的經典標記組合。

       盡管如此，選什么亞型，選什么來源，選什么熒光？依舊是小伙伴們為CD4+CD25+Foxp3+抗體組合的選擇的一大困擾！

       作為專業的流式抗體與解決方案，艾美捷科技，為您推薦流式科研與診斷方案領導者EXBio的CD4+CD25+FOXP3+Treg調節性T細胞檢測試劑盒（TregFlowEx Kit）

      試劑盒組分：

      (CD4+CD25+FOXP3+) Treg調節性T細胞檢測試劑盒實驗流程

      1.Surface staining：

      1.1 Add 10 ?l of CD4 FITC/CD25 PE reagent to tubes.

      1.2 Add 100 ?l of human blood.

      1.3 Mix well and incubate for 10 minutes in the dark in the refrigerator (2?8℃).

      1.4 (optional wash) Wash cells by adding 2 ml of cold PBS and centrifuge at 300 g for 5 minutes at 4℃.

      1.5 Aspirate supernatant and proceed immediately to the intracellular staining.

      2.Intracellular staining

      2.1 Add 1 ml of the diluted cold Fix and Lysing Solution.

      2.2 Mix and incubate for 10 minutes in the dark in the refrigerator (2?8℃).

      2.3 Add 0.5 ml of Permeabilizing Solution.

      2.4 Mix and incubate for 10 minutes in the dark in the refrigerator (2?8℃).

      2.5 Centrifuge the cells at 400 g for 5 minutes at 4℃. (Do not add any other buffer to the Fix/Perm mixture before centrifugation)

      2.6 Remove (decant) supernatant.

      2.7 Add 50 ?L of cold Blocking Buffer.

      2.8 Add 50 ?L of cold PBS.

      2.9 Mix and incubate for 5 minutes in the dark in the refrigerator (2?8℃).

      2.10 Add 5 μl of FoxP3 APC reagent.

      2.11 Mix and incubate for 30 minutes in the dark in the refrigerator (2?8℃).

      2.12. Wash cells twice with 2 ml of cold PBS, centrifugate at 400 g for 5 minutes at 4 ℃. Aspirate/decant supernatant.

      2.13. Add 300 ?l of 1% formaldehyde in PBS and store the stained samples at 2?8℃ until measured in flow cytometer. Analyze the processed samples within 4 hours.

      (CD4+CD25+FOXP3+) Treg調節性T細胞檢測試劑盒結果展示：

      使用TregFlowEx試劑盒中對人CD4陽性淋巴細胞進行流式細胞術多色染色。 Treg細胞（CD4 + CD25 + FOXP3 +）位于右上象限。

      【發表文章】

      Cern?, V., et al. "Lower Functional and Proportional Characteristics of Cord Blood Treg of Male Newborns Compared with Female Newborns. Biomedicines 2021, 9, 170." (2021).

      Morizawa, Yosuke, et al. "Correlation of immune cells and cytokines in the tumor microenvironment with elevated neutrophil-to-lymphocyte ratio in blood: an analysis of muscle-invasive bladder cancer."Cancer investigation7 (2018): 395-405.

      Hrd?, Ji?í, et al. "Decreased allergy incidence in children supplemented with E. coli O83: K24: H31 and its possible modes of action."European journal of immunology12 (2018): 2015-2030.

      Ond?ejíková, Leona.Rozdílné vlastnosti T regula?ních buněk v pupe?níkové krvi novorozenc? zdrav?ch a alergick?ch matek. BS thesis. ?eské vysoké u?ení technické v Praze. Vypo?etní a informa?ní centrum., 2017.

      【干貨】CD家族流式抗體大全（高清大圖）