肠血管活性多肽或生长抑素对多器官功能障碍综合征鼠肠黏膜MAdCAM-1表达的影响

目的 探讨肠血管活性多肽(VIP)或生长抑素(SST)对多器官功能障碍综合征(NODS)大鼠小肠黏膜地址素黏附分子-1(MAdCAM-1)表达的影响及其对MODS防治的意义.方法 36只雄性Wistar大鼠随机分为6组(每组6只),包括对照组(正常大鼠)、VIP1组和SST1组(分别经VIP和SST处置的止常人鼠)、MODS组(MODS大鼠)、VIP2组和SST2组(分别经VIP和SST处置的MODS大鼠).采用肠缺血再灌注方法制作MODS大鼠(出现全身炎症反应,＞2个器官功能障碍)模型.VIP或～SYITM以0.2 ρmol·g-1·h-1静脉输入和0.25 ρmol/g腹腔注入大鼠体内.各组收集的肠淋巴细胞用51 Cr标记后心输入大鼠体内,γ计数器测定其在肠相关淋巴组织(GALT)的数量分布;Western blot测定各组小肠黏膜MAdCAM-1的表达;组织化学法观察各组小肠黏膜组织学变化.数据采用t检验进行分析.结果 VIP1组和SST1组小肠弥散淋巴组织MAdCAM-1表达的峰浓度值分别为(157.67±2.52)、(154.33±3.22),Peyer's结为(136.00±1.00)、(137.00±1.00),较对照组(165.33±1.53)、(152.67±2.31)]无显著改变(P＞0.05);归巢至小肠弥散淋巴组织51 Cr-细胞量占总 51 Cr-细胞量的1.04%±0.59%、1.01%±0.83%,较对照组(1.07%±0.61%)无显著改变(P＞0.05);Peyer's结为1.83%±0.90%、1.56%±0.64%,显著低于MODS组(3.85%±2.02%),P＜0.05].VIP2组和SST2组小肠弥散淋巴组织MAdCAM-1表达的峰浓度值分别为(158.00±2.65)、(154.33±1.53),Peyer's结为(156.33±1.53)、(151.33±2.31),较MODS绀(175.33±2.52)、(173.00±2.65),P＜0.05];归巢至小肠弥散淋巴组织51 Cr-细胞量占总51 Cr-细胞量的1.58%±0.42%、1.45%±0.26%,Peyer's结为2.14%±1.49%、0.81%±0.35%,显著低于NODS组(3.23%±1.69%)、(5.04%±1.23%),P＜0.05],并伴有肠黏膜组织学损害的减轻.结论 增加MODS人鼠血循环中的VIP或SST,可通过抑制肠黏膜MAdCAM-1表达,减少肠淋巴细胞门巢至GALT,减轻MODS时肠黏膜的炎性损伤.

Effects of vasoactive intestinal peptide or somatostatin on the expression of MADCAM-1 in the intestinal mucosa of rats with multiple organ dysfunction synarome

Objective To investigate the effects of somatostatin(SST)or vasoaetive intestinal peptide (VIP)on the expression of MAdCAM-1 in the intestinal muecosa of rats with multiple organ dysfunction syndrome (MODS)and its significance of prevention and treatment of MODS.Method Thirty six Wistar male rats were randomly divided into 6 groups(6 rats in each group),including control group,VIP group 1 and SST group1 (rats treated with VIP and SST respectively),MODS group(rats with MODS),VIP group 2 and SST group 2(NODS rats treated with VIP and SST respectively).The rat model of MODS(system inflammatory response syndrome,＞2 or-gans dysfunction)was established by occlusion of superior mesenteric arteries.0.2 ρmol·g-1 h -11 VIP or SST by intravenous injection combined with 0.25 ρmol/g VIP or SST by intraperitoneal injection were injected into rats.In each group,intestinal lymphocytes from rats labeled with 51 Cr were infused into rat veins and were quantified with γcounter in GALT.The expression of MAdCAM-1 in the intestinal mucosa was measured by western blot.Inflam-mation in the intestinal mucosa was evaluated with histological sections.Student's t test was used to assess differ-ence between the experiment group and the control group.Results In VIP group l and SST group 1,the peak values of MAdCAM-1 expression in diffusive lymphatic tissue of small intestinal were 157.67±2.52 and 154.33±3.22.and those in Peyer patches were 136.00±1.00 and 137.00±1.00.There were no significant difference when compared with control group(165.33±1.53,152.67±2.31,P＞0.05).The percentage of 51 Cr-lympho-cytes in diffusive lymphatic tissue of small intestine(1.04%±0.59%,1.01%±0.83%)showed no significant difference from control group(1.07%±0.61%,P＞0.05),and those in Peyer patches(1.83%±0.90%,1.56%±0.64%)were significantly less than control group(3.85%±2.02%,P＜0.05).In VIP group 2 and SST group 2,the peak values of MAdCAM-1 expression in diffusive lymphatic tissue of small intestinal(158.00±2.65,154.33±1.53)and Peyer patches(156.33±1.53.151.33±2.31)were significantly less than MODS group(175.33±2.52,173.00±2.65,P＜0.05).The percentage of 51 Cr-lymphocytes in diffusive lymphafic tissue of small intestine(1.58%±0.42%,1.45%±0.26%)and Peyer patches(2.14%±1.49%,0.81%±0.35%)were significantly less than MODS group(3.23%±1.69%,5.04%±1.23%,P＜0.05)and the se-vere histopathological danlage in intestine was relieved.Conclusions VIP or SST reduced intestinal lymphoeytes homing to GALT in rats with MODS through suppressing the expression of MAdCAM-1,and attenuated the inflam-matory injure in the intestinal mucosa.