Effects of sub-acute exposure to magnetic field on synthesis of plasma corticosterone and liver metabolism levels in female rats

To investigate the bio-effects of MF exposure on synthesis of plasma corticosterone and liver metallothionein [MT] concentrations in female rats Design: Female rats were exposed to 128 mT 1 hour/day for 10 consecutive days. Trunk blood of decapitated rats was collected and used for determination of corticosterone concentration. Quantification of MT was performed by using 109Cd. Whole liver were homogenized in 1 ml of a 0.25 M sucrose solution. Surgical Adrenalectomy [ADX] and sham-ADX were performed via dorsal approach under ether anesthesia. Setting: Female Wistar rats were housed in a cage, with free access to food and water [Faculte des Sciences de Bizerte, Tunisia]. Rats were cared for under the Tunisian Code of Practice for the Care and Use of Animals for Scientific purpose and the Experimental Protocols were approved by the Ethics Committee. Subjects: Treated and control groups [n=12] weighing 100-150g at the time of experiments were housed in the same condition three weeks before the beginning of the experiments. Main outcome measures: Counting radioactivity will be used as analysis marker of bio-effects of magnetic field. Sub-Acute exposure to magnetic field the exposition of rats 1 hour/day for 10 consecutive days to MF of 128 mT induced a significant increase [+104%, p<0.05] of plasma corticosterone concentrations showing a stress-state. Interestingly, MF induced an increase of metallothionein levels [+122%, p<0.05] in liver compared to controls. By contrast, levels of MT in adrenalectomised rats remained unchanged following MF exposure. Conclusions: The results presented above show, for the first time, that sub-acute exposure to MF stimulates plasma corticosterone and MT activities in female rats. Indeed, we have noted an apparent lack of MT response to MF exposure in adrenalectomized rats, indicating that probably biosynthesis of MT was induced by stress

Los corticoides en dermatologia / Corticosteroids in dermatology

Los corticoides se unen a receptores citoplasmaticos para luego interactuar con el ADN nuclear para la sintesis del RNA mensajero y la produccion de proteinas efectoras de la accion de los corticoides. Producen disminucion Leucocitaria pero con aumento de los neutrofilos, con accion mas maracada sobre los Linfocitos T que sobre los B; mejoran la inflamacion por inhibicion de la Quimiotaxis celular asi como la produccion de Prostaglandianas y Leucotrienos. Los corticoides se prescriben de acuerdo con la via de administracion, potencia, cuadro clinico, dosis, tipo de dermatosis, etc. Se describen las Dermatiitis en las que se debe usar Corticoides asi como en las que su uso no esta indicado