丹参提取物F对大鼠乙醇性胃粘膜损伤的影响及其机制的研究

在大鼠乙醇性胃粘膜损伤模型上，丹参提取物Ｆ ０．１ｍｌ／２００ｇ／ｍｉｎ ｉｖ５分钟可明显降低胃粘膜伊文斯兰含量（Ｐ＜０．０１）和被单星蓝染色的面积（Ｐ＜０．０１）及胃粘膜损伤程度（Ｐ＜０．０１）。用ＴＳ－２００组织光谱分析仪测定大鼠胃粘膜表层血液量和Ｈｂ氧饱和度，表明丹参提取物Ｆ可维持大鼠胃粘膜在６０％乙醇（容积比）后血液量和Ｈｂ氧饱和度基本不变。结果提示：丹参提取物Ｆ有抗大鼠乙醇性胃粘膜损伤作     

铅对小鼠海马[Ca2+]的影响及L型钙通道的作用

目的　探讨铅对分离的小鼠海马细胞内游离钙的影响及其及L型钙通道的作用。方法　采用低浓度胰蛋白酶消化法分离小鼠海马细胞 ,并以莹光指标剂 (Fura 2 )作Ca2 荧光探针 ,用双波长荧光法测定海马细胞 [Ca2 ] i。结果　铅可致分离的小鼠海马细胞 [Ca2 ] i 升高 [由静息时的 (2 0 3 4± 10 86)nmol L升至 (4 2 3 3± 19 2 6)nmol L] ,而不论胞外是否有钙 ;铅可抑制钾诱发海马细胞 [Ca2 ] i 升高 ,尼莫地平可加强这种抑制作用 ,而BayK864 4则可部分消除这种抑制作用。结论　铅可致分离的小鼠海马细胞 [Ca2 ] i 升高作用与胞内钙库释放有关 ;铅的抑制钾诱发海马细胞 [Ca2 ] i 升高作用与其抑制L型钙通道有关。     

用Fura-2双波长荧光法测定小鼠海马细胞内游离钙

目的:探讨小鼠海马细胞分离及细胞内钙离子浓度([Ca2 ]i)的测定.方法:低浓度胰蛋白酶消化、分离海马细胞,采用Ca2 荧光指示剂Fura-2双波长荧光法测定[Ca2 ]i.结果:海马细胞存活率超过95%.细胞外Ca2 1.0 mmol/L时,静息状态下海马细胞[Ca2 ]i为(210±10.7)nmol/L.30 mmol/L KCl可显著增加[Ca2 ]i,并且KCl的这种效应呈一定的剂量依赖关系.结论:低浓度胰蛋白酶消化分离小鼠海马细胞简单、可靠;Fura-2建立的双波长荧光法灵敏、可靠.     

急性染铅小鼠海马脑片凋亡相关酶活性变化

目的探讨急性铅中毒时小鼠海马钙蛋白酶和钙凋磷酸酶活性的变化及D-2-氨基-5-磷酸基戊酸(D-(-)-2-Amino-5-phosphonopentanoic acid，AP-5)的影响。方法采用离体海马脑片观察急性铅中毒时钙蛋白酶和钙凋磷酸酶活性的变化及AP-5的作用。结果急性铅中毒可致海马钙蛋白酶和钙凋磷酸酶活性增加，AP-5可拮抗铅的这种作用。结论AP-5可拮抗铅引起的海马钙蛋白酶和钙凋磷酸酶活化。     

碘缺乏和甲状腺功能减退对大鼠仔鼠小脑细胞外信号调节激酶1/2蛋白表达的影响

Objective To study the effects of iodine deficiency and hypothyroidism on protein expression of extracellular signal-regulate kinase(ERK1/2) in the cerebellum of rots. Methods Twenty-eight healthy Wistar rots, female, 60 days old, were randomly divided according to their body weight into control group, iodine deficient group and hypothyroidism groups. Hypothyroidism groups in accordance with drinking water containing propylthiouracil(PTU) were divided into doses of 5 mg/L and 15 mg/L groups, 7 rats in each group. Rats after pregnancy, iodine deficient rats were administered with iodine-deficient diet and hypothyroid rats were administered with PTU in drinking water. Pup's cerebellum in each group were weighed on day 14,21,28 and 42. Cerebellum tissue was observed for cerebellar morphology using silver staining and detected for ERK1/2 protein using immunohistochemistry on day 7,14,21,28 and 42. Results On day 14,21,28 and 42, cerebellum weight of pups from iodine-deficient[(0.0945±0.0233), (0.1347±0.0046), (0.1542±0.0094), (0.1949±0.0048)g]were significantly lighter than control[(0.1856±0.0123), (0.2049±0.0098), (0.2268±0.0065), (0.2606±0.0086)g, all P < 0.05]and hypothyroidism groups [for 5 mg/L group: (0.1741±0.0172), (0.1927±0.0103), (0.2181±0.0064), (0.2583±0.0054)g, all P<0.05; for 15 mg/L group: (0.1604±0.0083), (0.1682±0.0103), (0.1996±0.0073) and (0.2579±0.0067)g, all P< 0.05]the difference had statistical significance(F=6.325,8.870, 16.191 and 21.574, all P<0.05). Compared to the controls on day 7, iodine-deficient group didn't have clear layers; on day 21, disappearance of external granule cells from iodine-deficient and 15 mg/L groups was delayed, still two or three layer external granule cells remained; on day 28 and 42, molecular layer from 5, 15 mg/L and iodine-deficient groups and became thinner. Immunohistochemistry showed that on day 7, there was no statistical difference of integrated optical density average of ERK1/2, in all the groups(F=1.102, P>0.05); on day 14,21,28 and 42, integrated optical density average of ERK1/2 in iodine-deficient group[(7.3245±0.5070), (8.3606±1.0683), (9.1217±1.0402), (12.1587±0.7581), all P<0.01]and hypothyroidism groups [for 5 mg/L group: (11.4307±1.5200), (14.919±0.8497), (16.0082±1.1130), (15.7721±0.8293), all P< 0.01; for 15 mg/L group: (7.8538±0.9775), (11.2461±0.8138),(12.78±1.3783), (13.0871±1.1450), all P < 0.01]was significantly lower than those of controls [(16.2831±0.5143), (20.2653±0.9551), (22.7485±1.0267), (22.1725±0.9939), all P < 0.01], the difference having a statistical signifieance(F=16.131,13.543,26.953,41.583, all P<0.01). Conclusions Iodine deficiency and hypothyroidism during critical periods of brain development may change eerebellar morphology and down regulate the protein expression of ERK1/2, which may result in damage of cerebellum development.     

碘缺乏和甲状腺功能减退对大鼠仔鼠小脑cAMP反应元件结合蛋白表达的影响

目的 研究碘缺乏和甲状腺功能减退对大鼠仔鼠小脑cAMP反应元件结合蛋白(CREB)表达的影响.方法 分别选用低碘饲料及丙基硫尿啼啶(propylthiouracil,PTU)饮水诱导建立低碘及甲状腺功能减退Wistar大鼠动物模型,按体重随机分成对照组、甲状腺功能减退组(5 mg/L PTU组、15 mg/L PTU组)和碘缺乏组,出生后第14天(PN14)、PN21、PN28、PN42时,测定仔鼠小脑重量,PN7、PN14、PN21、PN28、PN42时取小脑组织进行免疫组织化学链霉菌抗生物素蛋白-过氧化物酶(SP)染色,用图像分析方法分析大鼠仔鼠小脑皮质CREB表达情况.结果 PN14、PN21、PN28、PN42时,碘缺乏组小脑重量显著低于对照组和甲状腺功能减退组(P＜0.05).PN7时,各组之间小脑组织CREB平均积分光密度值差别不明显,而PN14,PN21,PN28和PN42时,5、15 mg/L PTU组和碘缺乏组平均积分光密度值均低于对照组(P＜0.05).结论 碘缺乏和甲状腺功能减退可降低大鼠仔鼠小脑组织CREB表达,影响神经系统的发育.

Abstract：

Objective To study the effects of iodine deftcieney and hypothyrosis on protein expression of CREB in the cerebellum of rats.Methods Iodine deficient rats were administered with iodine-deficient diet and hypothyroid rats were administered with PTU in drinking water.Female Wistar pregnant rats (n=28)were randomly divided into four groups:control group,iodine deficient group,5 mg/L PTU group and 15 mg/L PTU group.On PN14,PN21,PN28,pups cerebellum in each group were weighed.On PN7.PN14,PN21,PN28,cerebellum tissue were determined for CREB protein detection by immunohistochemistry.Results Cerebellum weights of pup from iodine-deftcient were significantly lighter than control,5 mg/L and 15 mg/L groups on PN14,PN21,PN28 and PN42.In the result of immunohistochemistry:on PN7,there was no significant difference in all the groups.On PN14,PN21,PN28 and PN42,CREB expression in 5,15 mg/L and iodine-deficient groups was significantly lower than that of the control group(P＜0.05).Conclusion Iodine deficiency and hypothyrosis during critical periods brain development may down regulate the protein expression of CREB,which may result in damage of serebellum development.     

碘缺乏和甲状腺功能减退对大鼠仔鼠小脑细胞外信号调节激酶1/2蛋白表达的影响

目的 观察碘缺乏和甲状腺功能减退(甲减)对大鼠仔鼠小脑细胞外信号调节激酶1/2(extracellular signal-regulate kinase,ERK1/2)蛋白表达的影响.方法 健康Wistar大鼠28只,雌性,60日龄.将大鼠按体质量随机分为对照组、碘缺乏病组、甲减组,甲减组根据饮水中含丙基硫尿嘧啶(PTU)剂量分为5 mg/L组和15 mg/L组.每组各7只.母鼠妊娠后,分别选用低碘饲料及PTU饮水诱导建立低碘及甲减大鼠动物模型.仔鼠出生7、14、21、28、42 d时分别处死,测定仔鼠小脑质量;取小脑组织进行镀银染色和免疫组织化学链霉菌抗生物素蛋白-过氧化物酶(S-P)染色,光镜下观察小脑形态学变化,图像分析仪下观察ERK1/2蛋白表达.结果 仔鼠出生14、21、28、42 d时,小脑质量各组间比较差异有统计学意义(F=6.325、8.870、16.191、21.574,P均<0.05);碘缺乏病组仔鼠小脑质量[(0.0945±0.0233)、(0.1347±0.0046)、(0.1542±0.0094)、(0.1949±0.0048)g]明显低于对照组[(0.1856±0.0123)、(0.2049±0.0098)、(0.2268±0.0065)、(0.2606±0.0086)g,P均<0.05]和甲减组[5 mg/L组:(0.1741±0.0172)、(0.1927±0.0103)、(0.2181±0.0064)、(0.2583±0.0054)g,P均<0.05;15 mg/L组:(0.1604±0.0083)、(0.1682±0.0103)、(0.1996±0.0073)、(0.2579±0.0067)g,P均<0.05].出生7 d时,对照组、甲减组仔鼠小脑皮质具有典型的层状结构,各层之间界限清晰,但碘缺乏病组各层之间界限模糊;出生21 d时,与对照组比较,15 mg/L组和碘缺乏病组仔鼠小脑外颗粒细胞消失延迟,仍有2～3层外颗粒细胞;出生28、42 d时,甲减组和碘缺乏病组仔鼠小脑分子层厚度低于对照组.小脑组织ERK1/2平均积分光密度,在出生7 d时,组间比较差异无统计学意义(F=1.102,P>0.05);在出生14、21、28、42 d时,各组间比较差异有统计学意义(F=16.131、13.543、26.953、41.583,P均<0.01);碘缺乏病组(7.3245±0.5070)、(8.3606±1.0683)、(9.1217±1.0402)、(12.1587±0.7581)和甲减组[5 mg/L组:(11.4307±15200)、(14.919±0.8497)、(169082±1.1130)、(15.7721±0.82913);15 ms/L组:(7.8538±0.9775)、(11.2461±0.8138)、(12.7800±1.3783)、(13.0871±1.1450)]明显低于对照组[(16.2831±0.5143)、(20.2653±0.9551)、(22.7485±1.0267)、(22.1725±0.9939),P均<0.01].结论 碘缺乏和甲减可使仔鼠小脑产生明显的形态学改变,降低大鼠仔鼠小脑组织ERK1/2蛋白表达.影响神经系统的发育.     

丹参提取物F对大鼠乙醇性胃粘膜损伤的影响及其与胃粘膜微循环关系的研究

本文探讨丹参提取物-F(DSE-F)对大鼠乙醇性胃粘膜损伤(EGMLR)的作用及机制。(1)实验组:200±20 g Wistar系雄性大鼠,禁食24小时,不限饮水。60%(vol/vol)乙醇(0.5 ml/100 g wt)灌胃,灌乙醇前按     

酒精对胃粘膜微循环血液灌注的影响及丹参提取物F的作用

本文探讨酒精对大鼠胃粘膜表层微循环血液灌注的影响以及内源性前列腺素,丹参提取物F(DSE-F)的作用。实验用Wistar系体重140～180克雄性大鼠53只,随机分配于各实验组。用反射光谱分析仪TS-200,测定     

丹参提取物F对乙醇诱导的大鼠胃粘膜损伤和胃粘膜微血管损伤的抑制作用及对脂质过氧化物的影响

目的:观察丹参提取物F(DSE-F)对乙醇诱导的大鼠胃粘膜损伤及其微血管损伤的抑制作用及对脂质过氧化物的影响.方法:160-200g Wistar系雄性大鼠随机分为空白对照,对照及丹参提取物F组,实验前24hr禁食不禁水,经胃管向胃内分别灌注生理盐水、无水乙醇、及DSE-F(1mL/100g),0.5hr后处死动物.测定了胃粘膜损伤、胃粘膜微血管的损伤、胃粘膜超氧化物歧化酶(SOD)活性和谷胱甘肽过氧化物酶(GSH-Px)活性及丙二醛(MDA)含量.结果:1)对照组及DSE-F组的大鼠胃粘膜损伤面积(%)分别为7.57±0.50,2.53±0.22;光镜下Ⅲ级损伤(%)分别为51.88±11.20,20.67±5.05;两组差异均有统计学意义(P<0.01),DSE-F对乙醇致胃粘膜损伤具有抑制作用.2)对照组及DSE-F组的胃粘膜伊文斯蓝EB含量(ng/g湿重)分别为12.46±0.70,8.05±1.86;单星蓝MB染色面积(%)分别为4.54±0.83,0.90±0.10;两组差异均有统计学意义(P<0.05),DSE-F可减轻乙醇致胃粘膜微血管的损伤作用.3)与空白对照组的大鼠胃粘膜的SOD(Nu/mg pro)和GSH-Px(u)的活性分别为7.68±0.68(Nu/mg pro),52.67±21.32(u)相比,对照(无水乙醇)组的SOD及GSH-Px的活性为3.18±0.59(Nu/mg pro),31.52±14.65(u),均显著降低(P<0.01).DSE-F组的SOD及GSH-Px的活性为6.11±0.54(Nu/mg pro),49.31±15.82(u)均显著高于对照组(P<0.01).而空白对照组的MDA含量(nmol/mg pro)为0.90±0.05,对照组及DSE-F组的MDA含量则分别为1.38±0.19,0.92±0.06.结论:丹参提取物F具有对乙醇致大鼠胃粘膜损伤及胃粘膜微血管损伤的抑制作用,该作用与其促进胃粘膜SOD及GSH-Px的活性及抑制MDA的作用相关.