摘要
目的探讨甘草酸对白细胞介素13(IL-13)诱导的气道黏液高分泌的作用。方法sD大鼠50只用随机数字表法随机分为5组:对照组、IL-13组和不同浓度(25、50、75mg/kg)甘草酸组。通过黏液组化染色,采用形态定量法计算气道上皮组织染色阳性部分表达强度积分;体外培养人支气管上皮细胞株HBE-16细胞,分为6组:阴性对照组(生理盐水)、IL-13对照组(10斗∥L的IL-13±生理盐水)和不同浓度甘草酸干预组(10μg/L的IL-13分别加25、50、75μmol/L甘草酸)、阳性对照组(10μg/L的IL-13±25μmol/L唑泊司他),通过反转录-PCR、Western印迹、荧光法和活性氧细胞渗透性指示剂(CM—H。DCFDA)探针的荧光强度分别检测各组HBE-16细胞黏蛋白(MUC)5ACmRNA、MUC5AC蛋白表达及细胞内的醛糖还原酶(AR)活性和活性氧(ROS)相对表达水平。结果体内实验:各组气道上皮组织染色阳性细胞表达强度积分分别为0.12±0.03、0.87±0.13、0.56±0.08、0.46±0.06、0.35±0.04,不同浓度甘草酸组明显低于IL-13组(均P〈0.05),并有剂量依赖性;IL-13组明显强于对照组(P〈0.05)。体外实验:各组HBEl6细胞的AR活性及48h时的ROS相对表达水平分别为0.156±0.021、0.692±0.039、0.436±0.019、0.323±0.042、0.290±0.027和5.127±0.033、24.257±3.263、11.966±0.283、8.892±0.521、6.426±0.173,IL-13对照组明显高于阴性对照组(P〈0.05),不同浓度甘草酸干预组明显低于IL.13对照组(均P〈0.05);各组HBEl6细胞MUC5ACmRNA和MUC5AC蛋白表达分别为0.82±0.05、3.22±0.12、2.57±0.34、2.09±0.54、1.58±0.22和0.18±0.04、0.65±0.15、0.48±0.11、0.33±0.19、0.26±0.06,IL-13对照组明显高于阴性对照组(P〈0.05),不同浓度甘草酸干预组明显低于IL-13对照组(均P〈0.05)。结论甘草酸可抑制IL-13诱导的MUC5ACmRNA和蛋白质的表达,抑制气道黏液高分泌。
Objective To explore the effects of glycyrrhizin on airway mucus hypersecretion induced by interleukin-13 ( IL-13 ) in rats. Methods A total of 50 SD rats were divided randomly into 5 groups with a random digit table: control group, IL-13 group, and different dosage (25, 50, 75 mg/kg) glycyrrhizin groups. The integral of expression intensity in positive cells of airway epithelium under mucus histochemical stain was calculated with modality-quantitative method. HBE-16 cells were divided into 6 groups: negative control (physiological saline), IL-13 control (10 μg/L IL-13 ± physiological saline), different concentration glycyrrhizin interference (10 μg/L IL-13 ± 25, 50 and 75 μmol/L glycyrrhizin, respectively) and positive control ( 10 μg/L IL-13 ± 25 p.moi/L zopolrestat). The expression of mucin (MUC) 5AC mRNA, MUC5AC protein, aldose reductase (AR) activity and reactive oxygen species (ROS) content were detected by reverse transcription-polymerase chain reaction (RT-PCR) , Western blot, fluorometric method and fluorescence intensity with General Oxidative Stress Indicator (CM-H2DFDA) catheter respectively. Results In vivo, the integral of expression intensity in positive stain cells of airwayepithelium were 0. 12 ±0. 03,0. 87±0. 13, 0. 56 ±0. 08, 0. 46 ±0. 06 and 0. 35 ±0. 04 respectively while the integral of different dosage glycyrrhizin groups was significantly lower than that of [L-13 group ( all P 〈 0. 05) with dose depentency and the IL-13 group was stronger than control group (P 〈0. 05). In vitro, the index of AR activity and ROS at 48 h of HBE16 cells in every group were 0. 156 ±0. 021, 0. 692 ±0. 039, 0. 436 ±0. 019, 0. 323 ± 0. 042 and 0. 290 ± 0. 027; 5. 127 ± 0. 033, 24. 257± 3. 263, 11. 966 ± 0. 283, 8. 892 ±0. 521 and 6. 426 ±0. 173 respectively. The indices of IL-13 control group were higher than those of negative control group ( P 〈 0. 05 ) while those of different concentration glycyrrhizin interference groups were lower than those of IL-13 control group (all P 〈0. 05). The expressions of MUC5AC mRNA and protein of HBE16 cells in every group were 0. 82±0. 05, 3.22 ±0. 12, 2. 57 ±0. 34, 2. 09±0. 54 and I. 58±0. 22; 0. 18 ±0. 04, 0. 65 ±0. 15, 0.48 ±0. 11 , 0. 33 ±0. 19 and O. 26 ±0. 06 respectively. The indices of IL-13 control group were higher than those of negative control group (P 〈 0. 05 ) and those of different concentration glyeyrrhizin interferenee groups were lower than those of IL-13 control group ( P 〈0. 05 ). Conclusion Glycyrrhizin may inhibit the expression of MUC5AC mRNA and MUC5AC protein induced by IL-13 and control the hvpersecretion of airway mucus.
出处
《中华医学杂志》
CAS
CSCD
北大核心
2013年第28期2225-2229,共5页
National Medical Journal of China
基金
国家自然科学基金(31171346)