محمدی, محمد تقی
[ 1 ] - آثار ترمیمی وانادیوم بر سلول‌های بتای پانکراس درموش صحرایی مبتلا به دیابت نسبتاً شدید قندی تجربی
مقدمه: ترکیبات وانادیوم علاوه بر آثار ضد دیابتی از طریق تحریک گیرنده‌های انسولینی، به نظر می‌رسد که بسته به شدت دیابت اثر بهبودی بخشی هم در ترمیم سلول‌های بتای پانکراس تخریب شده توسط استرپتوزوتوسین در موش‌های صحرایی داشته باشند. مواد و روش‌ها: برای بررسی این اثر سه گروه حیوان به صورت اتفاقی انتخاب و با تزریق mg/Kg 40 استرپتوزوتوسین دیابت قندی نسبتاً شدید در آن‌ها با قند خون mg/dL 600-500 ایجاد ش...
[ 2 ] - Quantitative Assessment of Proliferative Effects of Oral Vanadium on Pancreatic Islet Volumes and Beta Cell Numbers of Diabetic Rats
Background: Oral vanadyl sulfate (vanadium) induces normoglycemia, proliferates beta cells and prevents pancreatic islet atrophy in streptozotocin-induced diabetic rats. Soteriological method is used to quantitate the proliferative effects of vanadium on beta-cell numbers and islet volumes of normal and diabetic rats. Methods: Adult male Sprague-Dawley rats were made diabetic with intravenous s...
[ 3 ] - Does the Relief of Glucose Toxicity Act As a Mediator in Proliferative Actions of Vanadium on Pancreatic Islet Beta Cells in Streptozocin Diabetic Rats?
Background: Data shows vanadium protects pancreatic beta cells (BC) from diabetic animals. Whether this effect is direct or through the relief of glucose toxicity is not clear. This study evaluated the potential effect of oral vanadyl sulfate (vanadium) on glycemic status and pancreatic BC of normal and diabetic rats. Methods: Rats were divided into five groups of normal and diabetic. Diabetes ...
[ 4 ] - Attenuation of Focal Cerebral Ischemic Injury Following Post-Ischemic Inhibition of Angiotensin Converting Enzyme (ACE) Activity in Normotensive Rat
Background: Central renin angiotensin system has an important role on the cerebral microcirculation and metabolism. Our previous work showed that inhibition of angiotensin converting enzyme (ACE) activity prior to induction of ischemia protected the brain from severe ischemia/reperfusion (I/R) injuries. This study evaluated the impacts of post-ischemic inhibition of ACE, enalapril, on brain inf...
[ 5 ] - Contribution of Nitric Oxide Synthase (NOS) Activity in Blood-Brain Barrier Disruption and Edema after Acute Ischemia/ Reperfusion in Aortic Coarctation-Induced Hypertensive Rats
Background: Nitric oxide synthase (NOS) activity is increased during hypertension and cerebral ischemia. NOS inactivation reduces stroke-induced cerebral injuries, but little is known about its role in blood-brain barrier (BBB) disruption and cerebral edema formation during stroke in acute hypertension. Here, we investigated the role of NOS inhibition in progression of edema formation and BBB d...
[ 6 ] - Inhibition of nitric oxide synthase activity improves focal cerebral damage induced by cerebral ischemia/reperfusion in normotensive rats
Introduction: Nitric oxide seems to play a dual role in ischemia/reperfusion injury. Few studies have investigated whether it exacerbates or improves brain edema. In the present study, we inhibited the activity of nitric oxide synthase by L-NAME and evaluated the cerebral infarct volume, tissue swelling and brain edema, alongside the measurement of blood flow of the ischemic region. Methods...
[ 7 ] - Quantitative evaluation of hemodynamic parameters during acute alveolar hypoxia and hypercapnia in the isolated ventilated-perfused rabbit lung
Introduction: Acute respiratory disorders such as obstructive pulmonary diseases and hypoventilation may lead to alveolar hypoxia and hypercapnia which their effects on pulmonary vascular beds are controversial. The aim of this study was to establish the isolated perfused lung setup and investigate the effects of alveolar hypoxia and hypercapnia on pulmonary vascular resistance. Methods: White ...
[ 8 ] - Comparison effect of pentobarbital sodium with chloral hydrate anesthesia on post-ischemic damage in an experimental model of focal cerebral ischemia
Introduction: Anesthetic agents, blood pressure, arterial pH and blood gases have found to influence on the pathophysiology of experimental stroke. Despite, there are very few comparative studies about effects of anesthetic agents in animal model of cerebral ischemia. Therefore, in this study, we investigated the effects of chloral hydrate and pentobarbital anesthesia, as comparative study, on...
[ 9 ] - Quantitative evaluation of Blood Brain Barrier permeability in transient focal cerebral ischemia in the rat
Introduction: Development of brain edema following focal cerebral ischemia exacerbates primary ischemic injury. Blood brain barrier (BBB) opening is an important part of edema named as vasogenic brain edema. In this study, quantitative alterations of BBB permeability is experimentally evaluated using transient focal cerebral ischemia in the rat. Methods: Two groups of male rats (ischemic and sh...
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