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Effect of inducible nitric oxide synthase or cyclooxygenase-2 on retinal neovasc ularization in oxygeninduced retinopathy mouse model

Objective To investigate the effect of inducible nitric oxide synth ase (iNOS) or cyclooxygenase－2 (COX－2) on retinal neovascularization and its possible mechanism in oxygen－induced retinopathy （OIR） mouse model. Methods Retinal neovascularization was induced by oxygen with different concentration. The expression of iNOS, COX－2, matrix metalloproteinases 2 (MMP－2) and vascular end othelial growth factor (VEGF) in the retinae of experimental animals were analyzed by immunohistochemistry, realtime polymerase chain reaction and western blotting technologies. Results The inhibition of COX－2 or iNOS obviously attenuated retinal neovascularization and decreased the expression of VEGF and MMP－2. The iNOS inhibition decreased COX－2 expression, and vice versa. Conclusions COX－2 and iNOS may play a role in retinal neovascularization in OIR mouse model, which may act by regulating the expression of VEGF and MMP－2.

Relationship Between Level of Nitric Oxide in the Blood of Portal Vein and the Hyperdynamic Circulatory Syndrome in Partial Portal Vein Ligative Rats

ObjectiveTo understand the effect of nitric oxide (NO) on the formation of hyperdynamic circulatory syndrome (HCS) and the influence of level of NO on HCS. MethodsAfter establishment of stable HCS in partial portal vein ligated rats,the quantity of NO in blood of portal vein and the activity of nitric oxide synthase (NOS) in liver were determined by pre and post injection of inhabitor of NOS (NGmethylLarginine) and hemodynamics was supervised simultaneously.ResultsThe quantity of NO was paralleled with the activity of NOS and was elevated markedly by 24 hours after operation and reached the top by 48 hours after surgery. These sequential changes were coincided with the dilation of general vascularture. There was a close relation between this changes and the formation of HCS.The quantity of NO and the activity of NOS were decreased significantly to the level of the control group after injection of NGmethylLarginine (LNMMA). LNMMA inhabited the activity of NOS and blocked the production of NO. HCS ameliorated obviously. ConclusionNO plays an important role in initiating the dilation of general vascularture and plays a critical role in the formation of HCS. HCS will be ameliorated obviously or be blocked completely by eliminating the effect of NO and the portal pressure will decreased significantly or recover to normal range.

Changes and Mechanism of Colon Motility of the Rats in Multiple Organ Dysfunction Syndrome Induced by Bacterial Peritonitis

【Abstract】ObjectiveTo explore the changes of colon motility of the rats in multiple organ dysfunction syndrome （MODS） induced bacterial peritonitis and the effects of IL6, TNFα and induce nitricoxide synthase (iNOS) on colon motility. MethodsWistar rats were divided into two groups, which were the control group and the MODS group. The number of stool, the amplitude changes of circular smooth muscle strip, the length of smooth muscle cell, and the changes of serum NO in two groups were observed. The expressions of IL6, TNFα and iNOS protein and IL6 mRNA, TNFα mRNA and iNOS mRNA in distal colon were investigated by using immunohistochemical methods and RTPCR. ResultsThe numbers of stool and the amplitude in the MODS group were lower than those of the control group （P＜0.05）. The expressions of IL6, TNFα and iNOS were negative in the control group, while they were positive in the MODS group. IL6 mRNA,TNFα mRNA and iNOS mRNA were negative expression in the control group, but they were positive expression in the MODS group. The concentration of serum NO and the length of smooth muscle cells in the MODS group were higher than those of the control group (P＜0.01). ConclusionColon motor dysfunction of the rats is related to the iNOS, IL6 and TNFα.

L-精氨酸对乳猪深低温停循环脑代谢与结构的影响

目的 通过深低温停循环(DHCA)转流模型,研究左旋精氨酸(L-arg)在低温缺血时对脑代谢和结构的影响. 方法 采用上海种白猪,3～4周龄,随机均分成4组: L-arg组,左旋硝基精氨酸甲酯(L-NAME)组, L-arg+L-NAME组和对照组,每组10只.按临床方法行心肺转流术,于转流前、降温末、复温末和转流结束等分别测定颈内静脉一氧化氮(NO)、脑皮质三磷酸腺苷(ATP)和颈内静脉乳酸含量.并行脑组织学和超微结构观察. 结果 降温末L-NAME组和对照组NO含量较其它两组明显下降(Plt;0.01).复温末,除L-NAME组外,其余3组均恢复至转流前水平(Plt;0.01),L-arg组NO水平在复温末较转流前高(Plt;0.01). 转流开始后大脑皮质ATP即有明显下降,L-arg组下降幅度最小,且在复温末已接近转流前水平;L-NAME组下降幅度最大(Plt;0.01). 转流开始后颈内静脉乳酸含量即升高,L-arg组和L-arg+L-NAME组上升幅度较小;降温末和转流结束乳酸含量较其它两组低(Plt;0.01). 大脑皮质组织学和超微结构检查显示,大脑皮质细胞结构变化L-arg组和L-arg+L-NAME组较对照组和L-NAME组轻. 结论 深低温停循环手术时,应用L-arg具有较好的脑保护作用,而L-NAME有脑损害作用.L-arg可部分逆转DHCA时L-NAME对脑组织的损害作用.

Effects of L-Arginine on Rats Lung with Traumatic Pulmonary Contusion

Objective To investigate the effects of nitric oxide precursor L-arginine on traumatic pulmonary contusion. Methods Sixty Sprague-Dawley rats were randomly divided into three groups, ie. a normal group, a model group, and a L-arginine group. The model of traumatic pulmonary contusion was established with self-made chest-impacter. Then the rats in the L-arginine group was injected intravenously with L-arginine in a dose of 250 mg/kg. All rats were sacrificed at 24 hours after these models established.Levels of TNF-α and nitric oxide ( NO2 - /NO3- ) in serum were measured by ELISA and diazo-reaction method. Lung wet/dry weight ratio, NF-κB, endothelin-1, apoptotic cell, and ICAM-1 ( intercellular adhesion molecule-1) mRNA expressions in the lung tissue were measured. Results Compared with the model group,TNF-αand lung wet/dry weight ratio decreased significantly in the L-arginine group( P lt; 0. 05) . After the L-arginine treatment, the concentration of nitric oxide, apoptotic index were significantly higher than the model group ( P lt; 0. 05) . The expressions of NF-κB, endothelin-1, and ICAM-1 mRNA in the L-arginine group were lower than those in the model group ( P lt;0. 05) . Conclusion L-arginine treatment can downregulate the expressions of NF-κB, ET-1, ICAM-1 mRNA and apoptosis obviously, and ameliorate the microcirculation of rats lung with traumatic pulmonary contusion.

一氧化氮与眼底病相关研究的新进展

许多研究表明一氧化氮（NO）同眼底循环血管性眼病、皮质盲、葡萄膜炎、青光眼等的发病有密切联系，并对这些眼病的发病机制提出了新的认识，也为它们的治疗提供了新的思路。 （中华眼底病杂志，1996，12：59-61）

糖尿病视网膜病变血管内皮生长因子、γ-干扰素和一氧化氮的变化

糖尿病大鼠视网膜一氧化氮合酶阳性神经元表达的变化

Diagnostic value of exhaled nitric oxide in adult asthma: a systemic review and meta-analysis

ObjectiveTo explore the diagnostic value of fractional exhaled nitric oxide (FeNO) in adult asthma.MethodsPubMed, Embase, Cochrane Library, Wanfang, CNKI and VIP databases were searched for relevant literatures from the time of database establishment to February 2021. Data analysis were made by Revman and Stata.ResultsA total of 44 articles with 47 records and 9654 subjects were included. The diagnosis sensitivity, specificity, positive and negative predictive value of FeNO were 0.71 (95%CI 0.65 - 0.76), 0.80 (95%CI 0.75 - 0.84), 3.47 (95%CI 2.86 - 4.21), and 0.37 (95%CI 0.31 - 0.43), respectively. The diagnostic odds ratio was 9.49 (95%CI 7.13 - 12.61), and the area under the receiver operating characteristic curve was 0.82 (95%CI 0.79 - 0.85).ConclusionsFeNO has certain diagnostic value in diagnosis of asthma. Types of asthma, region and cut-off value all have impact on the diagnostic efficiency of FeNO.

Relationship between Inducible Nitric Oxide Synthase and Endothelin mRNA Expression and Intestinal Damage and Effect of Salvia in Acute Pancreatitis

【摘要】目的探讨重症急性胰腺炎(SAP)时胰腺组织的诱导型一氧化氮合成酶(iNOS)、内皮素（ET1） mRNA表达状态, 以及与血浆中NO、ET1浓度和肠道损伤的关系及丹参治疗的影响。方法Wistar大鼠45只随机分为3组:SAP模型组(A组),SAP丹参治疗组(B组),假手术 组(C组),进行不同治疗和观察分析。结果A组血中淀粉酶(AML)、ET1、NO、内毒素(LPS)含量、125 I白蛋白累积指数及腹水量均显著高于C组(Plt;0.01);与A组比较,B组胰腺ET1和iNOS mRNA表达较弱,血中AML、ET1、NO、LPS及腹水量显著下降(Plt;0.01),125 I白蛋白累积指数较A组也有下降,但无差异(Pgt;0.05)。结论SAP时存在肠道损伤,胰腺组织ET1、iNOS mRNA的过度表达,使血中ET1、NO浓度升高,造成肠道屏障功能受损,肠通透性增加,引起内毒素血症。丹参注射液通过减轻SAP时胰腺的病理损害程度,下调胰腺ET1和iNOS mRNA的表达,使血中ET1、NO浓度下降,对SAP及其肠道损伤有一定治疗作用。