scholarly journals Consequences of Dental Occlusion Enhancement by Means of Metal Crowns on the Animal Model

2019 ◽  
Vol 69 (12) ◽  
pp. 3517-3519
Author(s):  
Ana Ispas ◽  
Antarinia Craciun ◽  
Liana Lascu ◽  
Marcela Elisabeta Barbinta Patrascu ◽  
Mariana Constantiniuc
Keyword(s):  
Oxidative Stress ◽  
Animal Model ◽  
Free Radicals ◽  
Wistar Rats ◽  
Vertical Dimension ◽  
Dental Occlusion ◽  
Control Group ◽  
Experimental Group ◽  
Plasma Malondialdehyde

The purpose of this study was to determine whether there is a correlation between induced occlusal trauma and the occurrence of oxidative stress in the hippocampus. Twenty Wistar rats were randomized into three experimental groups and one control group. Animals in the experimental group were cemented modified crowns on molars to induce occlusal trauma in 7, 14 and 30 days. To evaluate the oxidative stress, blood was drawn from the hippocampus at 7, 14 and 30 day intervals. Oxidative stress was evaluated using the following specific tests: determination of plasma malondialdehyde and serum glutathione values. The results of the study demonstrate that malocclusion experienced by raising the vertical dimension in rats resulted in significant reductions in antioxidants and increase level of free radicals.

scholarly journals Effect of Photobiomodulation Therapy on Oxidative Stress Markers in Healing Dynamics of Diabetic Neuropathic Wounds in Wistar Rats

2021 ◽  
Author(s):  
Gagana Karkada ◽  
G. Arun Maiya ◽  
Praveen Arany ◽  
Mohandas Rao ◽  
Shalini Adiga ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Wound Healing ◽  
Wistar Rats ◽  
Healing Process ◽  
Photobiomodulation Therapy ◽  
Control Group ◽  
Sciatic Nerve Crush ◽  
Oxidative Stress Markers ◽  
Stress Markers ◽  
Experimental Group

Abstract Background Prolonged and overlapping phases of wound healing in diabetes are mainly due to the redox imbalance resulting in the chronicity of the wound. Photobiomodulation therapy works on the principle of absorption of photon energy and its transduction into a biological response in the living tissue. It alleviates the cellular responses, thereby improving the mechanism of wound healing in diabetes. Objective To find out the effect of photobiomodulation therapy of dosage 4 J/cm2 in the healing dynamics of diabetic neuropathic wounds in Wistar rats and its relation with oxidative stress markers. Methodology Diabetes was induced using Streptozotocin of 60 mg/kg of body weight to eighteen female Wistar rats. Neuropathy was induced by the sciatic nerve crush injury followed by an excisional wound of 2 cm2 on the back of the animal. Experimental group animals were treated with dosage 4 J/cm2 of wavelength 655 and 808 nm, and control group animals were kept unirradiated. The biomechanical, histopathological, and biochemical changes were analysed in both groups. Results There was a reduction in mean wound healing time and an increased rate of wound contraction in the experimental group animals compared to its control group. The experimental group showed improved redox status, and histopathological findings revealed better proliferative cells, keratinisation, and epithelialization than un-irradiated controls. Conclusions Photobiomodulation therapy of dosage 4 J/cm2 enhanced the overall wound healing dynamics of the diabetes-induced neuropathic wound and optimised the oxidative status of the wound, thereby facilitating a faster healing process.

scholarly journals Nephroprotective Effects of L-Arginine against Chemotherapy Induced Acute Kidney Injury in Wistar Rats

2020 ◽  
Vol 9 (4) ◽  
pp. 249-255
Author(s):  
Dr.Kumayl Abbas Meghji ◽  
Dr.Tariq Feroz Memon ◽  
Dr. Imtiaz Ahmed ◽  
Dr. Sehar Gul Memon ◽  
Dr. Naila Noor ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Acute Kidney Injury ◽  
Wistar Rats ◽  
Kidney Injury ◽  
Control Group ◽  
P Value ◽  
Renal Histology ◽  
Renal Markers ◽  
Group B ◽  
Experimental Group

Objective To evaluate the protective role of L-Arginine in cisplatin induced acute renal injury through assessment of renal, oxidative stress and inflammatory markers in albino wistar rats. Methods: Quasi-experimental study was conducted at the department of physiology and postgraduate research laboratory at Isra University, Hyderabad, Sindh from April 2019 to September 2019. Thirty male Albino wistar rats were selected through non-random purposive sampling and divided equally into three different groups: Group-A (Control group), Group-B (experimental group) received Cisplatin alone and Group-C (experimental group) received Cisplatin along with arginine. After sacrificing the animals, blood samples were collected through cardiac puncture while renal histopathological analysis was under the light microscope. The changes in severity were observed using a graded scale. Data was analysed using SPSS v23.0. Results: There was a statistically significant (p-value <0.05) decline in the bodyweight and rise in absolute kidney weight of group B in comparison with other two group. Moreover, significant rise (p-value <0.05) in serum renal markers was observed in group B while significant decline (p-value <0.05)  in these serum renal markers in group C compared with group B.  Furthermore, prominent demage in normal renal histology in group B rats while restoration of renal histology was demonstrated in group C rats. Conclusion: The present study concludes that L-Arginine exerts an anti-oxidative, anti-inflammatory and nephro-protective effect for renal tissue damage caused by Cisplatin. Keywords: Acute Kidney Injury, Antioxidant, Cisplatin, L-Arginine, Oxidative stress

scholarly journals Influence of melatonin pre-treatment and preconditioning by hypobaric hypoxia on the development of cortical photothrombotic ischemic lesion

2008 ◽  
pp. 283-288
Author(s):  
I Matějovská ◽  
K Bernášková ◽  
D Krýsl ◽  
J Mareš
Keyword(s):  
Endothelial Cells ◽  
Free Radicals ◽  
Endothelial Dysfunction ◽  
Hypobaric Hypoxia ◽  
Wistar Rats ◽  
Control Group ◽  
Ischemic Lesion ◽  
Pre Treatment ◽  
Experimental Group ◽  
Grade Iii

Photothrombotic model of ischemia (PT) is based on free radicalmediated endothelial dysfunction followed by thrombosis. Free radicals are also involved in hypoxic preconditioning. We tested the sensitivity of PT to preconditioning with hypobaric hypoxia and to pretreatment with melatonin. In adult Wistar rats, after intravenous application of Rose Bengal, a stereo-tactically defined spot on the denuded skull was irradiated by a laser for 9 min. The first experimental group underwent hypobaric hypoxia three days before irradiation. In the second experimental group, melatonin was applied intraperitoneally one hour before irradiation. Three days after irradiation, animals were sacrificed, the brains perfused, and stained with TTC. Ischemic lesions were divided into grades (I, II, III). In the control group (where no manipulation preceded photothrombosis), most animals displayed deep damage involving the striatum (grade III). The group preexposed to hypoxia showed similar results. Only 28.57 % of the melatonin pretreated animals exhibited grade III lesions, and in 57.14 % no signs of lesions were detected. Pre-exposure to hypoxia was not protective in our model. Pretreatment with melatonin lead to a significant reduction of the number of large ischemic lesions. This result is probably caused by protection of endothelial cells by melatonin.

scholarly journals Carvedilol Protects against Cyclosporine Nephropathy in Rats

2006 ◽  
Vol 75 (1) ◽  
pp. 85-89 ◽  
Author(s):  
H. Kotolová ◽  
P. Kollár ◽  
M. Jarošová
Keyword(s):  
Animal Model ◽  
Pilot Study ◽  
Wistar Rats ◽  
Serum Levels ◽  
Treated Group ◽  
Renal Tissue ◽  
Control Group ◽  
Serum Transferrin ◽  
Protein Levels

The aim of our experimental work was to study whether carvedilol is able to protect renal tissue from cyclosporine toxic effect in animal model of cyclosporine nephropathy. The study was performed on twenty Wistar rats divided in two experimental groups: control (treated with placebo) and carvedilol (treated with p.o. dose 10mg/kg/day in 1 ml solution). Cyclosporine in oral dose of 15 mg/kg/day was administered to all animals during 15 days of experiment. Urine was collected daily for the assessment of diuresis, proteinuria, and determination of urea and creatinine levels. Serum collected at the end of the experiment (day 15) was used for the determination of urea and transferrin levels. The level of renal tissue damage was evaluated by the Jones method for basal membranes, glomeruli and tubuli impregnation, and by the Kossa method for calcium impregnation. For the determination of paranuclear inclusions presence we used chromanilinblue (CAB) method. Statistically significant differences between total protein levels in urine on day 7 of the experiment and urea levels in serum at the end of the experiment in the control group and the carvedilol-treated group indicate a protective effect of carvedilol on renal tissue, which is supported also by the results of a histological examination of renal tissue. Significant increase in the serum transferrin level was registered in the carvedilol-treated group and no significant changes were noted in ceruloplasmin serum levels. In conclusion, our pilot study showed that carvedilol has the ability to protect renal tissue from cyclosporine induced nephropathy in rats.

Determination of the L-ascorbic acid requirements in Wistar osteogenic disorder Shionogi rats for prolonged carcinogenesis experiments

1996 ◽  
Vol 30 (4) ◽  
pp. 337-346 ◽  
Author(s):  
S. W. Y. Chan ◽  
P. C. Reade
Keyword(s):  
Animal Model ◽  
Ascorbic Acid ◽  
Drinking Water ◽  
Normal Level ◽  
Physical Condition ◽  
Wistar Rats ◽  
Clinical Signs ◽  
Supplement Group ◽  
Palatal Mucosa

Wistar Shionogi rats of the ( od/od) substrain with the osteogenic disorder are unable to synthesize L-ascorbic acid ( L-AA) and appear to be an appropriate animal model for studying the effect of L-AA in carcinogenesis. To determine the minimal L-AA requirements of these animals for prolonged survival in a satisfactory physical condition during experimentation, four concentrations of L-AA (0.33 g/l, 0.67 g/l, 1.67 g/l and 3.33 g/l) were administered via drinking water to four groups of animals ( n=2). Their water intake per cage was recorded three times weekly and the plasma L-AA levels were determined at the start, after 2, 4, 8 and 12 weeks and at the termination of the experiment. To simulate the procedures to be undertaken in oral mucosal carcinogenesis experiments, the animals were gently restrained and a designated amount of sterile NaCl was applied to the palatal mucosa three times a week for 26 weeks. The L-AA supplement group with the lowest concentration (0.33 g/l L-AA) achieved mean plasma levels of 7 ± 1.38 μM, approximately one-eighth that of the normal level (mean plasma L-AA level in outbred Wistar rats was found to be 58 ± 3 μM) whilst those in the higher supplement group (3.33 g/l L-AA) achieved a mean of 18 ± 1.25 μM. All of the animals employed in the present study survived for 26 weeks and showed no clinical signs of L-AA deficiency during this period.

scholarly journals A Subpressor Dose of Angiotensin II Elevates Blood Pressure in a Normotensive Rat Model by Oxidative Stress

2015 ◽  
pp. 153-159 ◽  
Author(s):  
M. M. GOVENDER ◽  
A. NADAR
Keyword(s):  
Oxidative Stress ◽  
Blood Pressure ◽  
Angiotensin Ii ◽  
Mrna Expression ◽  
Rat Model ◽  
Wistar Rat ◽  
Control Group ◽  
Sod Activity ◽  
Male Wistar Rats ◽  
Experimental Group

Oxidative stress is an imbalance between free radicals and antioxidants, and is an important etiological factor in the development of hypertension. Recent experimental evidence suggests that subpressor doses of angiotensin II elevate oxidative stress and blood pressure. We aimed to investigate the oxidative stress related mechanism by which a subpressor dose of angiotensin II induces hypertension in a normotensive rat model. Normotensive male Wistar rats were infused with a subpressor dose of angiotensin II for 28 days. The control group was sham operated and infused with saline only. Plasma angiotensin II and H2O2 levels, whole-blood glutathione peroxidase, and AT-1a, Cu/Zn SOD, and p22phox mRNA expression in the aorta was assessed. Systolic and diastolic blood pressures were elevated in the experimental group. There was no change in angiotensin II levels, but a significant increase in AT-1a mRNA expression was found in the experimental group. mRNA expression of p22phox was increased significantly and Cu/Zn SOD decreased significantly in the experimental group. There was no significant change to the H2O2 and GPx levels. Angiotensin II manipulates the free radical-antioxidant balance in the vasculature by selectively increasing O2− production and decreasing SOD activity and causes an oxidative stress induced elevation in blood pressure in the Wistar rat.

scholarly journals Motivation of senior school persons for participation in professionally oriented competitions

2020 ◽  
pp. 15-21
Author(s):  
P.V. Tkachenko ◽  
◽  
D.A. Severinov ◽  
K.V. Luganskaya
Keyword(s):  
General Education ◽  
Vocational Guidance ◽  
Educational Process ◽  
Practical Significance ◽  
Control Group ◽  
Intellectual Activity ◽  
Face To Face ◽  
Tv Shows ◽  
Experimental Group

Analyzed is the problem of motivation of senior school persons for participation in professionally oriented competitions. Relevance: modern seniors easily learn technical subjects, cope with management of most of latest gadgets, and require new (not standard, interesting for teenager) format in conduct of vocational guidance events, such as quests, intelligent games in the style of TV shows, et all. Such a format allows participant to “go beyond”, look at the future profession and educational process slightly from a different angle. Methodology and research methods: a non-standard competition acts as example of intellectual natural-scientific tournament Credo Medicus, and that is a system of face-to-face intellectual competitions for two months with a break of 7 days between its stages. Participants are seniors of general education institutions. At the end of tournament field study of motivation of 30 seniors-participants (16–17 years old) participate in competitions of professional orientation (experimental group), that was carried out by means of following tests: determination of professional tendencies; motive for choosing a profession. Results of the survey were compared to the responses of 30 seniors, who did not participate in the tournament. Results: the experimental group is dominated by internal socially significant motifs (4.4), which is 0.8 more than in the control group (p = 0.0008). And in the control group, there is prevalence of internal (3.68 and 3.64) motifs over external (2.56 and 2.76) motifs. Scientific novelty of the research: it was found, that participants of intellectual tournament are more prone to knowledge and intellectual activity. When choosing a profession, they are dominated by socially significant motives, the role of external positive motives is small, and the desire to be useful for society is significantly expressed, that is most typical for medical activities. Practical significance of the research: materials of the study can serve as demonstration of experience of introducing into vocational guidance work of university a new format of events, such as the open intellectual natural-scientific tournament Credo Medicus, that allows to assess motivational aspects of choice of the profession of doctor of future applicants, and already at the stage of school education to engage in targeted training of interested and gifted teenagers.

scholarly journals The effect of vitamin C on Endosulfan-induced oxidative stress parameters in prepubertal rats

Biomedicine ◽  
2020 ◽  
Vol 39 (2) ◽  
pp. 333-338
Author(s):  
Kalaivani Manokaran ◽  
Vasanthalaxmi Krishnananda Rao ◽  
Nilima . ◽  
Manjula Shimoga Durgoji Rao ◽  
Sucheta Prasanna Kumar
Keyword(s):  
Oxidative Stress ◽  
Vitamin C ◽  
Wistar Rats ◽  
Statistical Significance ◽  
Treated Group ◽  
Reproductive Organs ◽  
Protective Role ◽  
Control Group ◽  
Group I ◽  
Testicular Weight

Introduction and Aim: Oxidative stress plays a very important role in endosulfan-induced toxic effects on reproductive organs. Vitamin C is a potent antioxidant which plays an important role in decreasing oxidative stress. The present study was aimed to investigate the protective role of vitamin C against endosulfan-induced testicular toxicity in Wistar rats. To investigate a protective effect of vitamin C against endosulfan induced toxicity on biochemical changes. Materials and Methods: Seventy male neonatal Wistar rats were divided into  seven groups. The group  I was taken as the control group, the endosulfan-treated were grouped into II (3 mg/kg body weight (BW) and group III (6 mg/kg BW), Group IV (9 mg/kg BW) and Group V (12 mg/kg BW). Group VI (9 mg/kg BW) and group VII (12 mg/kg BW) were pretreated with vitamin C (20 mg/kg BW) for 60 days. After  the experimental procedures, the testicular weight, lactate dehydrogenase (LDH) enzyme and testosterone in plasma, LDH, steroidogenic enzymes 3?-HSD and 17?-HSD in testis were evaluated. One-way ANOVA was used to determine the statistical significance. Results: Significant improvement in the testicular weight (P<0.05) , LDH (P<0.05) levels both in plasma and testis, increase in testosterone(P<0.001) and steroidogenic enzyme levels(P<0.001) was observed in the group pretreated with vitamin C treated group when compared to the endosulfan treated group. Conclusion: Vitamin C decreases the toxic effect of endosulfan on testis. The present action might be  due to its antioxidative properties.

scholarly journals Bisphosphonate’s Effect on Tongue Mucosa: An Experimental Electron Microscopy Study

Medicina ◽  
2020 ◽  
Vol 56 (2) ◽  
pp. 51
Author(s):  
Theodora Papamitsou ◽  
Antonios Morsi-Yeroyannis ◽  
Anastasios Papanastasiou ◽  
Nikolaos Bakalopoulos ◽  
Eva-Maria Dietrich ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Intercellular Space ◽  
Wistar Rats ◽  
Middle Layer ◽  
Microscopy Study ◽  
Electron Microscopy Study ◽  
Control Group ◽  
The Past ◽  
Transmission Electron ◽  
Experimental Group

Background and objectives: Bisphosphonates (BPs) are selective inhibitors of osteoclasts, used for the treatment of bone disorders. The objective of this study is to investigate the possible effects of BPs on the tongue’s mucosa. Materials and Methods: Specimens of the tongue of 20 female 12-month old Wistar rats were taken. Ten were used as control group, while in the remaining alendronate (Fosamax, Merck) was administered per os from 13 weeks. Observation of the harvested samples was made by Transmission Electron Microscopy (TEM). Results: In the experimental group, focal alterations were observed to various extent in all specimens. The basement membrane was intact. Furthermore, an increase at the intercellular space was observed, predominantly at the middle layer, and the desmosomes were disorganized. In the lamina propria focal edema was observed. Conclusions: Investigation on the effect of BPs on the tongue’s mucosa through TEM hasn’t been documented in the past. According to our results, BPs seem to cause mild mucosal lesions on the tongue.

Allantoin as a marker of oxidative stress in human erythrocytes

2008 ◽  
Vol 46 (9) ◽  
Author(s):  
Roman Kand'ár ◽  
Pavla Žáková
Keyword(s):  
Oxidative Stress ◽  
Renal Failure ◽  
Uric Acid ◽  
Chronic Renal Failure ◽  
Gradient Elution ◽  
Reversed Phase ◽  
Control Group ◽  
Uric Acid Concentration ◽  
Reversed Phase Hplc

Abstract: Uric acid is the final product of purine metabolism in humans. It was determined that this compound has important antioxidative properties and it may be oxidized to allantoin by various reactive oxygen species. Therefore, the measurement of allantoin may be useful for the determination of oxidative stress in humans.: We measured allantoin and uric acid in human plasma and erythrocytes obtained from patients with chronic renal failure before hemodialysis (n=30) and blood donors (n=30). We used a method based on selective isolation of allantoin from deproteinized plasma and erythrocyte lysate samples on AG 1-X8 resin and its derivatization to glyoxylate-2, 4-dinitrophenylhydrazone. Separation of glyoxylate-2, 4-dinitrophenylhydrazone from interfering substances was achieved on reversed phase HPLC with gradient elution and UV/VIS detection at 360 nm. Uric acid was determined by reversed phase HPLC with UV/VIS detection at 292 nm.: We found significant differences in allantoin and uric acid concentration between the patients with chronic renal failure and the control group both in plasma (20.5±6.5 μmol/L and 323.9±62.9 μmol/L vs. 2.1±1.1 μmol/L and 270.1±62.3 μmol/L, p<0.05) and erythrocytes [82.8±39.1 nmol/g hemoglobin (Hb) and 110.7±28.8 nmol/g Hb vs. 20.1±6.1 nmol/g Hb and 82.1±23.7 nmol/g Hb, p<0.05].: Significant higher levels of allantoin in both plasma and erythrocytes of patients with chronic renal failure indicate that allantoin may be used as a good marker of oxidative stress.Clin Chem Lab Med 2008;46:1270–4.

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