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Showing 3 results for Nitric Oxide
Gholhmhosein Ettehad, Firouzeh Afshar-Ghahramani, Yasamin Pahlavan, Mojtaba Amani ,
Volume 12, Issue 5 (11-2012)
Abstract
Background & Objectives: Endothelium nitric oxide synthase (eNOS) is a type of enzyme which produces an endogenous factor called nitric oxide (NO). NO plays important role in progress of euplastic diseases. In chronic gastritis, the increased level of NO causes damages to DNA. The aim of present study is to evaluate eNOS concentration in sera of healthy people and those infected by Helicobacter pylori . Methods: The sera and stool specimens from 84 voluntaries (Female: 58.3%, Males 41.6%) were collected. Helicobacter pylori antigen in the stool specimens and eNOS levels in sera were determined using ELISA . Obtained data were analyzed using Excell software. Results : The age range was from 1 to 78 years old (Mean: 30 years old). In terms of special diseases, 70.2% did not have any special diseases, but 29.76% showed at least one special disease, mainly thyroid disease and hypertension. The results for H. pylori stool antigen detection showed that 16.6%, 29.76% and 53.57% of collected specimens were equivocal, Helicobacter pylori negative and positive respectively. Comparison of sera concentrations of eNOS showed that there is no significant change among these three groups. Conclusion : As mentioned in results, the eNOS sera concentrations showed no significant change in Helicobacter pylori positive and negative groups. Albeit the other studies showed the significant increase in serum concentration of Helicobacter pylori positive patient, this controversy may arise from race and variations in Helicobacter pylori pathogenic islands such as those containing VacA and CagA. We propose to conduct a similar study in Ardabil to focus on the pathogenic islands of H. pylori strains in this province.
Farin Malekifard, Norooz Delirezh, Rahim Hobbenaghi, Hasan Malekinejad,
Volume 18, Issue 2 (7-2018)
Abstract
Background & objectives: Several studies have shown that pentoxifylline is an antioxidant and anti-inflammatory agent. Pentoxifylline (PTX), has been shown to exert protective effects on autoimmune disorders. The objective of the present study was to examine the effect of pentoxifylline on histopathology of pancreas in diabetic mice.
Methods: Diabetes was induced by multiple injection of low-dose streptozotocin (40 mg/kg/day for 5 consecutive days) in male C57BL/6 mice. After induction of diabetes, mice were treated with pentoxifylline (100 mg/kg/day i.p.) for 21 days. The nitric oxide levels were evaluated in spleen cell culture supernatant. Pancreases were isolated and stained by hematoxylin & eosin (H&E) and Gomori aldehyde fuchsin (GAF).
Results: Pentoxifylline treatment significantly inhibited the production of nitric oxide (p<0.05). In addition, PTX improved the pancreas tissue. It increased the mean diameter of islets and the number of islets and beta cells. (p<0.05).
Conclusion: These findings indicated that pentoxifylline might have a therapeutic effect against the autoimmune destruction of the pancreatic beta-cells during the development of STZ-induced type 1 diabetes in mice.
Alireza Badirzadeh,
Volume 19, Issue 2 (7-2019)
Abstract
Leishmaniasis is a tropical parasitic disease that has become a major health challenge in many countries of the world. Not only has not been found any effective vaccine or treatment for the disease eradication, but also the advent of drug resistance is also increasing. Therefore, it is vital to take a precise attention to the physiochemical cycles of the Leishmania parasite and to identify its biochemical pathways. One of the most important biochemical pathways of host and parasite is the arginase and nitric oxide cycles. By using L-arginine, arginase plays an important role in the metabolic pathways, particularly in ornithine production, polyamines biosynthesis and cellular activities, including proliferation and cell survival. Furthermore, L-arginine, can act as a substrate for inducible nitric oxide synthase (iNOS), which leads to the synthesis of nitric oxide (NO), thereby activating the cellular immune system and clearing intracellular parasites. High Arginase activity reduces the parasite load inside the host cell, and since lymphocytes need L-arginine for their activity, its deficiency impairs the response of host immune cells. Also, parasites arginase alone can determine the fate of Leishmania parasite within the host cell. The aim of this study was to provide a comprehensive overview of various studies on the arginase activity of both parasite and host and its direct impacts on the immune system and pathogenicity of the Leishmania parasite.
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