顺铂联合姜黄素诱导胃癌细胞凋亡的研究

目的：研究应用顺铂联合姜黄素对诱导胃癌细胞HGC27凋亡的影响及机制。方法：用CCK8法检测单独或联合使用不同剂量顺铂或/和姜黄素对胃癌细胞HGC27增殖的影响;用Hochest33258染色检测联合应用顺铂和姜黄素诱导胃癌细胞HGC27凋亡的发生率。用Western blot检测细胞凋亡相关分子PARP1蛋白剪切体和DNA损伤蛋白p-γH2AX的表达变化。结果：单用顺铂可以呈剂量依赖性地促进HGC27细胞凋亡。5μmol·L-1姜黄素对HGC27细胞增殖无明显作用,10μmol·L-1姜黄素反而轻微促进HGC27细胞增殖。20、40、80μmol·L-1姜黄素对HGC27细胞的增殖抑制率分别为10.97%、15.15%、32.93%。分析联合用药组：5μmol·L-1姜黄素联合顺铂组反而促进HGC27细胞生长;10μmol·L-1姜黄素联合不同剂量顺铂和单用顺铂组比较,组间抑制率没有统计学差异（P>0.05）。20μmol·L-1姜黄素联合4、6μmol·L-1顺铂有明显的促进细胞的凋亡作用,抑制率分别为70.68%、87.30%。 Hochest33258染色结果显示,联合用药组细胞凋亡小体和坏死细胞明显增多。 Western blot结果显示,在联合用药组HGC27细胞PARP1剪切体蛋白和p-γH2AX蛋白表达明显增加。结论：顺铂联合姜黄素可以促进胃癌细胞HGC27的凋亡,机制是姜黄素可以加重顺铂引起的细胞DNA双链损伤。     

病毒感染后表达下调的RNF167抑制小鼠腹腔巨噬细胞产生IFN-β

目的探讨RNF167对病毒感染的小鼠腹腔巨噬细胞产生IFN-β的调控作用。方法 RNA病毒VSV和DNA病毒HSV-1感染小鼠腹腔巨噬细胞后,Western blot检测RNF167的表达水平。利用RNA干扰减少小鼠原代腹腔巨噬细胞中RNF167的表达后,病毒感染小鼠腹腔巨噬细胞,实时荧光定量PCR法检测IFN-β的mRNA水平,ELIAS法检测细胞上清中IFN-β的浓度。Western blot法检测IFN-β的转录因子IRF3的磷酸化(p-IRF3)水平。结果VSV感染巨噬细胞4和8 h后,RNF167表达水平显著下降(P0.01),而HSV-1感染后RNF167的表达没有显著变化。si-RNF167降低小鼠腹腔巨噬细胞RNF167表达水平后,与对照细胞相比,感染RNA病毒后细胞中IFN-β的mRNA水平及上清中IFN-β水平显著下降(P0.01),p-IRF3水平也显著下降。而感染HSV-1病毒后上述指标均无差异。结论 RNF167能够特异性地调控RNA病毒感染的巨噬细胞中IFN-β的表达。     

IFN-γ诱导的自噬抑制人胎盘胎儿侧来源间充质干细胞增殖

目的探讨IFN-γ诱导无血清培养人胎盘胎儿侧来源MSCs自噬的发生,并分析自噬对细胞增殖的影响。方法用酶消化法和无血清培养体系分离培养人胎盘胎儿侧来源MSCs,利用流式细胞仪和分化培养体系鉴定细胞属性;用质量浓度50μg/L的IFN-γ处理人胎盘胎儿侧来源MSCs,以未处理细胞作为对照组,3-Ma处理为自噬抑制组;分别提取总蛋白,Western blot检测自噬标志基因LC3Ⅰ/Ⅱ的表达;mRFP-GFP-LC3腺病毒感染细胞,观察细胞内点状聚集的情况;MTT法检测IFN-γ对细胞增殖的影响。结果所分离细胞呈CD73、CD90和CD105阳性细胞,不表达CD14、CD34和CD45,具有向脂肪和成骨细胞分化的能力;IFN-γ可提高LC3Ⅱ的表达量(P0.05),荧光共聚焦显微境观察到IFN-γ处理细胞中的点状聚集显著增加;3-Ma可解除IFN-γ对MSCs增殖能力的抑制(P0.05)。结论 IFN-γ诱导的自噬负调控人胎盘胎儿侧来源MSCs的增殖能力。     

白藜芦醇对辐射诱导调节T细胞紊乱的调节作用

目的观察电离辐射及白藜芦醇对调节T细胞的影响,探讨其对细胞因子TGF-β及IFN-γ的影响,阐明白藜芦醇对辐射诱导免疫抑制的改善作用。方法将24只C57BL/6雄性小鼠随机分为对照组、照射组和照射给药组,每组8只。照射组和照射给药组接受137Cs源γ射线全身照射(6.0 Gy),对照组小鼠接受伪照射。照射前7 d及照射后28 d,每日予白藜芦醇(20 mg/kg)灌胃。末次给药后1 d,检测各组小鼠外周血CD4+CD25+细胞数量,CD4+CD25+细胞内Fox P3表达水平,脾淋巴细胞TGF-β分泌水平,以及CD8+细胞及脾淋巴细胞TNF-γ表达水平。采用单因素方差分析对3组间的细胞比例及细胞因子表达水平进行比较,组间多重比较采用LSD-t检验。结果与正常小鼠比较,电离辐射可以增高CD4+CD25+细胞在外周血单核细胞和CD4+中的比例125.0%和57.2%,增高脾细胞TGF-β水平31.4%,降低脾细胞IFN-γ表达水平26.9%,组间差异均具有统计学意义(均P0.05);白藜芦醇干预可以降低单纯照射组小鼠调节T细胞在外周血单核细胞和CD4+中的比例32.3%和27.8%,降低CD4+CD25+细胞的Fox P3阳性比例26.6%,以及脾淋巴细胞TGF-β水平62.9%,增加CD8+T细胞及脾淋巴细胞生成的IFN-γ水平133.0%和87.4%,组间差异均具有统计学意义(均P0.05)。结论白藜芦醇可以抑制调节T细胞,改善受照小鼠的免疫功能。     

百合固金汤合生脉散对肺结核患者血清中IFN-γ含量的影响

目的:观察百合固金汤合生脉散对肺结核患者血清中IFN-γ的影响。方法:将临床确诊为肺结核患者60例,随机分为治疗组和对照组各30例。对照组应用西药强化方案,治疗组在西药强化方案的基础上,应用百合固金汤合生脉散加减方治疗,治疗2个月,在治疗前后取外周血,用TB-IGRAF方法检测IFN-γ含量。结果:治疗后两组间血清IFN-γ含量水平比较有统计学意义(P0.05),治疗组优于对照组。结论:百合固金汤合生脉散加减方可以通过降低血清中IFN-γ水平,改善肺结核患者的临床症状。     

湿疹方治疗湿疹45例

目的:观察湿疹方治疗湿疹的临床疗效及对外周血白介素-4(interleukin-4,IL-4)、白介素-10(interleukin-10,IL-10)、干扰素-γ(Interferon-γ,IFN-γ)水平的影响。方法:将90例患者随机分为对照组和治疗组,每组各45例。对照组采用盐酸西替利嗪联合复方甘草酸苷口服,治疗组在对照组的基础上使用湿疹方,共治疗4周。观察两组患者的临床疗效及治疗前后IL-4、IL-10、IFN-γ变化情况。结果:对照组有效率为75.56%,治疗组有效率为88.89%,两组有效率比较,差异具有统计学意义(P0.05)。两组患者治疗后IL-4、IL-10水平均较治疗前升高,且优于对照组,差异均有统计学意义(P0.05)。两组患者治疗后IFN-γ水平较治疗前降低,且优于对照组,差异均有统计学意义(P0.05)。结论:湿疹方治疗湿疹疗效显著,可能主要通过升高IL-4、IL-10水平,降低IFN-γ水平起到抗炎作用。     

Wound healing potential of naringin ointment formulation via regulating the expression of inflammatory,apoptotic and growth mediators in experimental rats

Context: Wound healing is a consequence of a complex process involving inflammatory, proliferative, and remodeling phases. Naringin, a flavanone glycoside, is associated with modulation of various oxido-inflammatory and growth factors.

Aim: The aim of this study is to evaluate the wound-healing activity of naringin ointment formulation (NOF) on experimental wound models.

Materials and methods: A soft paraffin-based cream containing 1, 2, and 4% (w/w) naringin was formulated and evaluated for physicochemical characters. Excision wounds and incisions wounds were used to study the topical effect of NOF for 20 d (once a day) on various biochemical, molecular, and histological parameters.

Results: NOF (2 and 4%, w/w) treatment showed a significant decrease (p?<?0.05) in wound area and epithelization period whereas the rate of wound contraction increased significantly (p?<?0.05). The altered levels of oxido-nitrosative stress (SOD, GSH, MDA, MPO, and NO) were significantly (p?<?0.05) restored by NOF. Treatment produced a significant increase (p?<?0.05) in tensile strength, hydroxyproline content, and protein content. TNF-α, IL-1β, IL-6, IL-8, NF-κB, smad-7, and Bax mRNA expression were significantly down-regulated (p?<?0.05) by NOF, whereas polymerase gamma (pol-γ), smad-3, VEGF and TGF-β, and collagen-1 mRNA expressions were significantly up-regulated (p?<?0.05) by NOF. Histological alterations in wound skin were also restored by NOF.

Conclusion: NOF exerts wound healing potential via down-regulated expression of inflammatory (NF-κB, TNF-α, and ILs), apoptotic (pol-γ and Bax), and up-regulated growth factor (VEGF and TGF-β) expression, thus modulating collagen-1 expression to induce angiogenesis leading to wound healing.     

In vitro inhibitory effects of thymol and carvacrol on dendritic cell activation and function

Context: Thyme has been used in traditional medicine for medicinal purposes since ancient times.

Objective: The objective of this study was to investigate the effects of thymol and carvacrol as two major constituents of thyme on dendritic cells (DCs) maturation and T cell activation.

Materials and methods: Splenic DCs were treated with non-cytotoxic concentrations of the components and then analyzed for MHC II, CD86, and CD40 expression by flow cytometry. The effects of compounds on mitogenic, as well as allogenic T cell responses in mixed lymphocyte culture (MLR) and the release of cytokines were investigated.

Results: At 0.1?µg/ml, reduced mean fluorescent intensity (MFI) of CD86 for thymol (80.3?±?0.2% of untreated control) and CD40 for carvacrol (79.5?±?0.14%) was observed (p?<?0.001). Decreased mitogenic T cell proliferation by thymol [proliferation index (PI) from 0.93?±?0.11 at 1?µg/ml to 0.42?±?0.16 at 100?µg/ml (p?<?0.01)] and carvacrol [PI from 1.08?±?0.3 at 1?µg/ml to 0.28?±?0.1 at 100?µg/ml (p?<?0.001)] was seen. Ten micrograms/ml thymol (PI, 0.85?±?0.04) and carvacrol (PI, 0.89?±?0.03) inhibited allogenic T cell response (p?<?0.05). Decreased IFN-γ level in MLR supernatant from 1441?±?27.7?pg/ml in untreated cells to 944?±?32.1 at 10?µg/ml of thymol and of carvacrol (886?±?31.7?pg/ml) (p?<?0.01) was found. IL-4 levels were decreased in the presence of both compounds (p?<?0.01).

Conclusion: These data showed the suppressive effects of thymol and carvacrol on DCs maturation and function, as well as T cell responses.     

Plasma IL-4, IL-8, IL-12, interferon-γ and CRP levels in pregnant women with preeclampsia,and their relation with severity of disease and fetal birth weight

Objective: The aim of the present study was to evaluate the hypothesis that preeclampsia is associated with increased systemic inflammatory responses of Th1-type as well as decreased Th2-type responses compared with normal pregnancy. We also sought to determine whether there was a correlation between these markers with severity of preeclampsia and fetal birth weight. Methods: The study population consisted of maternal age, gestational age, and body mass index matched 138 pregnant women; 56 normotensive healthy pregnant women (group 1), 42 women with mild preeclampsia (group 2), 40 women with severe preeclampsia (group 3). Results: Plasma interleukin (IL)-8 and C-reactive protein (CRP) levels were significantly higher in group 3 than group 1 (p?<?0.05). Plasma IL-4, IL-12, and interferon (IFN)-γ levels were similar in all groups. Although plasma IL-8 and CRP levels of mild preeclamptic group were higher than control group and lower than severe preeclamptic group, the differences were not statistically significant. There was a positive correlation between IL-12 and fetal birth weight in severe preeclamptic group (p?<?0.05). Conclusions: Elevated maternal serum pro-inflammatory cytokine IL-8 and CRP in severe preeclamptic women compared with normal pregnant women supports the hypothesis that preeclampsia is associated with increased inflammatory responses.