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1.
Chinese Journal of Cancer Biotherapy ; (6): 128-134, 2024.
Article Dans Chinois | WPRIM | ID: wpr-1013473

Résumé

@#目的:通过向C57Bl/6J小鼠腹腔注射IFN-γ腺病毒(Ad-mIFN-γ)建立细胞因子释放综合征(CRS)的动物模型。方法:构建Ad-mIFN-γ及对照Ad-lacZ腺病毒载体,分别以MOI=100体外转染小鼠腹腔巨噬细胞,流式细胞术检测其对细胞mIFN-γ分泌的影响。将40只雌性C57Bl/6J小鼠按随机数字表法分为对照组、载体对照组、病毒低、中、高剂量组(每组8只),分别向各组小鼠腹腔注射PBS(200 μL)、Ad-lacZ(2×107 PFU/只)、Ad-mIFN-γ(5×106 PFU/只)、Ad-mIFN-γ(1.5×107 PFU/只)和Ad-mIFN-γ(2×107 PFU /只)。每日观测小鼠的体质量及生存情况;第3天时采用流式细胞术检测小鼠外周血和脾内单核细胞(CD11b+)、巨噬细胞(CD11b+/CD86+)比例,免疫荧光染色法检测脾内CD11b+的单核细胞比例;第9天时采用流式细胞术检测小鼠血清中细胞因子的分泌水平;第14天,采用颈椎脱臼法处死小鼠,H-E染色法观察小鼠肝、脾、肺和肾的病理和组织学变化。结果: Ad-mIFN-γ体外感染小鼠腹腔巨噬细胞,在第3天检测到巨噬细胞分泌mIFN-γ达到峰值(118.34±2.90)pg/mL,并在一周内持续高分泌mIFN-γ,Ad-lacZ对照组IFN-γ分泌水平较低后,第3天时为(0.17±0.08)pg/mL。小鼠腹腔注射Ad-mIFN-γ后,在14 d内病毒低、中剂量组无小鼠死亡,病毒高剂量组小鼠体质量持续减轻(P<0.001);第3天,病毒高剂量组小鼠外周血和脾组织内单核细胞、巨噬细胞比例较对照组和中剂量组均显著增加(P<0.05或P<0.01);第9天,病毒低、中、高剂量组小鼠血清中mIFN-γ、IL-6、单核细胞趋化蛋白-1(MCP-1)、IL-1、TNF-α等细胞因子的水平均显著升高(P<0.001);10 d内病毒高剂量组小鼠死亡率达100%。组织病理检测可见病毒高剂量组小鼠的肝、脾、肺、肾组织有明显损伤。结论: Ad-mIFN-γ体外感染小鼠原代腹腔巨噬细胞后,可以快速分泌mIFN-γ;腹腔注射高剂量(2×107 PFU/只)Ad-mIFN-γ导致小鼠出现CRS典型表现,可作为CAR-T细胞治疗诱发CRS的动物模型。

2.
Chinese Journal of Cancer Biotherapy ; (6): 28-34, 2023.
Article Dans Chinois | WPRIM | ID: wpr-961933

Résumé

@#[摘 要] 目的:通过构建表达IL-12的小鼠CAR-T细胞,探讨经尾静脉将其输注于小鼠体内建立细胞因子释放综合征(CRS)模型的方法。方法:构建基于靶向鼠源CD19的CAR分子,包装逆转录病毒载体并感染小鼠T细胞构建mCD19-CAR-T、mCD19/IL-12-CAR-T细胞。通过构建小鼠体内胰腺癌Panc02-CD19细胞移植瘤模型,检测mCD19/IL-12-CAR-T细胞的抗肿瘤活性,ELISA法检测两种CAR-T细胞IL-12和IFN-γ分泌水平;经小鼠尾静脉输注mCD19/IL-12-CAR-T 细胞构建CAR-T细胞CRS小鼠模型,流式细胞术检测小鼠血清中IL-6、MCP-1、IL-1、IL-10、TNF-α、IFN-γ等细胞因子的含量,H-E染色法观察荷瘤小鼠肝、脾、肺和肾的病理组织学变化。结果:经过培养扩增的mCD19/IL-12-CAR-T细胞能有效分泌IL-12,CAR阳性率达(56.9±5.4)%;与非靶细胞Panc02或靶细胞Panc02-CD19共培养时,均能高分泌IFN-γ。成功构建小鼠胰腺癌Panc02-CD19细胞移植瘤模型,经小鼠尾静脉注射1×106个mCD19/IL-12-CAR-T细胞能显著抑制移植瘤的生长,但未能诱发严重CRS;输注2×106个mCD19/IL-12-CAR-T细胞后,小鼠出现体质量减轻、血清炎性因子水平升高、组织损伤,最终导致死亡等一系列典型CRS表现。结论:成功构建IL-12-CAR-T细胞诱发的小鼠CRS模型,其稳定性好、重复性高,具有广泛的应用前景。

3.
Braz. j. med. biol. res ; 54(12): e11232, 2021. tab, graf
Article Dans Anglais | LILACS-Express | LILACS | ID: biblio-1345569

Résumé

Follicular regulatory T cells (Tfr) have critical functions in inflammatory and autoimmune disorders. The main purpose of the current work was to assess Tfr cell frequency in patients with dilated cardiomyopathy (DCM). Flow cytometry showed that, compared with normal controls, DCM cases showed markedly reduced Tfr cell rates and Tfr/Tfh ratios, but significantly increased follicular helper T cell (Tfh) rates. Correlation analysis showed that the Tfr rate in DCM patients was positively correlated with left ventricular ejection fraction (LVEF), and negatively correlated with N-terminal brain natriuretic peptide (NT-proBNP) levels. Lower Foxp3 and higher Bcl-6, ICOS, and PD-1 mRNA expression levels were found in patients with DCM. In addition, plasma interleukin (IL)-6, tumor necrosis factor (TNF)-α, and IL-21 levels were significantly increased in DCM cases. Moreover, IgG and IgG3 levels were also elevated in individuals with DCM. Correlation analysis showed that the Tfr rate in DCM patients was negatively correlated with IgG and IgG3, while the Tfh rate was positively correlated with IgG and IgG3. Changes in circulating Tfr levels may have a critical immunomodulatory function in DCM and may become a new therapeutic target for DCM.

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