Effect of exposure to electromagnetic field on some aspects of hepatic function in rats

Exposure to electromagnetic fields [EMF] may pose health risks and cell damage in various tissues, among the most susceptible tissues to EMF exposure being the liver. It was, thus, intriguing to investigate the possible effect of whole body exposure to EMF of mobile phones on some parameters reflecting the liver function. This study was performed on 111 albino rats of both sexes. Rats were divided into 2 main groups: 4 weeks exposure group [group I] and 8 weeks exposure group [group II]. Rats in each group were further subdivided into 4 subgroups, namely; rats not exposed to EMF of mobile phone [control groups, Ic and IIc], rats exposed to EMF of mobile phone for 1 hour/day [groups I[1] and II[1]], for 2 hours/day [groups I[2] and II[2]] and for 3 hours/day [groups I[3] and II[3]]. Exposure to EMF did not result in any significant change in plasma activities of both alanine aminotransferase [ALT] and aspartate aminotransferase [AST] in all exposed rats compared with their matched control. However, there was significant prolongation of both prothrombin time [PT] and activated partial thromboplastin time [PTT] accompained by significant elevation of hepatic malondialdehyde [MDA] content and reduction of nitric oxide [NO] content in hepatic tissue, the changes being more marked with increase in the duration of exposure. Microscopic examination of the liver tissue showed hepatocytic vacuolizations, irregular diameters of sinusoidal lumens, inflammatory cellular infiltrations and reduced glycogen content, the changes becoming intense with prolongation of the EMF exposure period. Exposure to EMF of mobile phones poses a risk factor for liver dysfunction, and, therefore, long term or excessive use of mobile phones better be avoided

Metabolic effects of streptozotocin-induced diabetes in ovarectomized rats

Little information is available about how the changes that occur around the time of menopause might affect management of diabetes mellitus .The present study investigates the metabolic consequences of estrogen deficiency with streptozotocin induced-diabetes. The study was performed on 130 female Wistar rats, allocated into 4 groups: control [Sham]; diabetic [STZ]; ovarectomized [OVX] and ovarectomized diabetic [OVX-STZ] .Rats were subjected to determination of body weight and body mass index [BMI]. Estimation of blood glucose, plasma levels of insulin, estradiol, leptin, malondialdehyde, lipids, atherogenic index as well as in vitro diaphragmatic glucose uptake and renal glucose output. OVX- STZ rats showed significantly lower body weight and BMI than OVX rats. Blood glucose level was significantly higher than Sham, STZ and OVX groups. Diaphragmatic glucose uptake significantly decreased, while renal glucose output significantly increased compared to OVX and Sham groups .Plasma lipid profile in OVX-STZ rats was worse than Sham, STZ and OVX groups as indicated by the significant increase in plasma triglycerides, total plasma cholesterol and LDL-c. Atherogenic index was significantly higher than Sham and OVX rats. Similarly, lipid peroxidation was significantly higher than Sham, STZ and OVX groups. Plasma insulin decreased significantly compared to Sham, STZ and OVX groups, while the decrease in plasma leptin was significant when compared to Sham group. The present study demonstrates that metabolic derangements of combined insulin and estrogen deficiency overweigh the derangement of either hormone deficiency in postmenopausal period

Assessment of the effect of lipoic acid administration on hemostatic and lipid parameters in ovariectomized rats

Adverse thrombotic cardiovascular events increase in women coincident with the onset of menopause. The aim of this work was to evaluate the effect of lipoic acid administration on hemostatic and lipid parameters, pertinent to thrombotic cardiovascular tendency in ovariectomized rats. Mature female rats were allocated into three groups namely; sham-operated, ovariectomized and lipoic acid-treated ovariectomized rats. Lipoic acid administration started 8 weeks after ovariectomy, and lasted for 3 weeks, in a dose of 100mg/kg body weight, on daily basis. All ovariectomized rats, whether treated or not, were sacrificed 11 weeks after ovariectomy. Various hemostatic and lipid parameters were evaluated, in addition to body mass index, body fat weight as well as malondialdehyde level and red blood cell profile. Compared with their non-treated ovariectomized littermates, lipoic acid-treated ovariectomized rats showed increased platelet count and decreased platelet aggregation, together with reduced fibrinogen level, body mass index and fat weight to body weight ratio, as well as the malondialdehyde level. Lipoic acid also ameliorated the increment in triglycerides, total cholesterol, low density lipoprotein and atherogenic index detected in the ovariectomized group. Lipoic acid treatment also caused reduction in red blood cell count, hemoglobin level and hematocrit value. The encountered data showed that the administration of lipoic acid may have favorable effects on females after menopause by mitigating some hemostatic and lipid parameters, together with control of body weight and body fat weight. The present findings indicate potential antiobesity, antiplatelet aggregation, antilipedemic and antiatherosclerotic effects of lipoic acid

Effect of medical ozone therapy on diabetes-induced cardiac dysfunction

Diabetic metabolic dysregulation is accompanied by oxidative stress that could possibly lead to dysfunction in cardiac myocytes. The aim of this study was to elucidate the effect of controlled medical ozone therapy to diabetic rats on ischemia reperfusion insult in isolated rat hearts. Both long-term [12 weeks duration] and short-term [20 days duration] treatment were investigated. Rats of each duration were divided into non-diabetic control group and streptozotocin-induced diabetic group, the latter group being further divided into two subgroups, namely, a group receiving medical ozone and the other remaining untreated. Long-term groups were studied for the cardiac responses before and after ischemia reperfusion. Short-term groups were used to assess the degree of leukocytic adhesion to coronary endothelium. In both durations, serum levels of CPK and TNF-alpha were determined. Long-term ozone therapy to diabetic rats improved myocardial depression before and after ischemia reperfusion, with reduction in ischemia reperfusion injury. Short-term therapy resulted in an attenuating effect on leukocyte adherence to coronary vascular endothelial cells after ischemia-reperfusion. The present data show the cardioprotective effect of medical ozone therapy on ischemia reperfusion injury in diabetic rats. The reduction in TNF-alpha may represent a mechanism for such protection. Prohibiting leukocyte-endothelial adhesion and transmigration may be useful in decreasing leukocyte-dependent post-reperfusion injury

Effects of ovariectomy and thyroidectomy on course and outcome of Trichinella spiralis infection in rat

Physiological hormones modulate immune responses and implicate in associated susceptibilities to infections. To clarify these endocrinological effects, the influence of estrogen and thyroid deficiency, due to ovariectomy and thyroidectomy, respectively, on course and outcome of Trichinella spiralis infection in rats was studied. While in ovariectomized rats there was significant increase in both adult and muscle larval counts as compared to intact infected rats, in thyroidectomized rats there was a significant increase in larval but not in adult count. Combined ovariectomy and thyroidectomy resulted in significant increase in both adult and larval counts. Serum CPK and blood glucose were significantly elevated in ovariectomized and/or thyroidectomized rats as compared to intact infected one. The deficiency of female sex hormones, and/or thyroid hormones in T. spiralis infected rats affected the host resistance to infection by increasing parasite burden influencing the course and outcome of parasitic infection

Efficacy of medical ozone in attenuation of murine schistosomiasis mansoni infection morbidity

Mice were divided into 3 groups: non-infected control, S. mansoni infected non-treated for 10 weeks and group receiving ozone intra-peritoneally for 21 days 10 weeks postinfection. Results showed that ozone therapy in chronic schistosomiasis mansoni decreased worm burden, increased number of dead eggs, decreased both mature and immature eggs, increased RBC count, improved hemoglobin concentration with reduced reticulocytes%, as well as increased lymphocyte%, decreased neutrophil% and markedly increased eosinophil%. Platelet count was increased and bleeding time was markedly shortened, markers for hepatic function were improved, and malondialdehyde concentration decreased in liver and spleen but increased in intestine. Reduction of associated hepato-splenomegaly was noticed, with reduction in number and size of hepatic and intestinal granulomas, collagen area% and number of macrophages, with preservation of hepatic and intestinal histological profile in almost all areas. The results point to medical ozone as a promising agent to complement schistosomiasis mansoni specific treatment, helping to attenuate infection morbidity