Differential effects of exercise on brain opioid receptor binding and activation in rats.

Physical exercise stimulates the release of endogenous opioid peptides supposed to be responsible for changes in mood, anxiety, and performance. Exercise alters sensitivity to these effects that modify the efficacy at the opioid receptor. Although there is evidence that relates exercise to neuropeptide expression in the brain, the effects of exercise on opioid receptor binding and signal transduction mechanisms downstream of these receptors have not been explored. Here, we characterized the binding and G protein activation of mu opioid receptor, kappa opioid receptor or delta opioid receptor in several brain regions following acute (7 days) and chronic (30 days) exercise. As regards short- (acute) or long-term effects (chronic) of exercise, overall, higher opioid receptor binding was observed in acute-exercise animals and the opposite was found in the chronic-exercise animals. The binding of [(35) S]GTPγS under basal conditions (absence of agonists) was elevated in sensorimotor cortex and hippocampus, an effect more evident after chronic exercise. Divergence of findings was observed for mu opioid receptor, kappa opioid receptor, and delta opioid receptor receptor activation in our study. Our results support existing evidence of opioid receptor binding and G protein activation occurring differentially in brain regions in response to diverse exercise stimuli. We characterized the binding and G protein activation of mu, kappa, and delta opioid receptors in several brain regions following acute (7 days) and chronic (30 days) exercise. Higher opioid receptor binding was observed in the acute exercise animal group and opposite findings in the chronic exercise group. Higher G protein activation under basal conditions was noted in rats submitted to chronic exercise, as visible in the depicted pseudo-color autoradiograms.

Omega-3 intake in people with epilepsy under regular hemodialysis program: here to stay.

Among the many risk factors suggested for sudden unexpected death in epilepsy (SUDEP), higher frequency of seizures is a very consistent issue. Furthermore, it has been established that hemodialysis-associated seizure is a complication of the dialysis procedure. Thus, since a possible relation between cardiovascular abnormalities and SUDEP among patients with chronic renal insufficiency in regular hemodialysis program should not be neglected, we propose in this paper that omega-3 fatty acids offer opportunities for prevention of sudden cardiac death or improved treatment in people with epilepsy under the regular hemodialysis program.

Omega-3 intake in people with epilepsy under regular hemodialysis program: here to stay / Suplementacao de omega 3 em pessoas com epilepsia submetidas a um programa regular de hemidialise: veio para ficar

Among the many risk factors suggested for sudden unexpected death in epilepsy (SUDEP), higher frequency of seizures is a very consistent issue. Furthermore, it has been established that hemodialysis-associated seizure is a complication of the dialysis procedure. Thus, since a possible relation between cardiovascular abnormalities and SUDEP among patients with chronic renal insufficiency in regular hemodialysis program should not be neglected, we propose in this paper that omega-3 fatty acids offer opportunities for prevention of sudden cardiac death or improved treatment in people with epilepsy under the regular hemodialysis program.

Dentre os fatores de risco sugeridos para a morte súbita inesperada em epilepsia (SUDEP), maior frequência de crises epilépticas é uma questão muito consistente. Além disso, tem sido estabelecido que as crises epilépticas associadas à hemodiálise são uma complicação do procedimento dialítico. Desse modo, como a existência de uma possível associação entre as alterações cardiovasculares e a SUDEP entre indivíduos com insuficiência renal crônica em tratamento dialítico não deve ser negligenciada, foi proposto neste artigo que o ômega 3 pode atuar na prevenção da morte súbita cardíaca ou melhorar o tratamento de pessoas com epilepsia inseridas em um programa regular de hemodiálise.

Role of physical exercise as complementary treatment for epilepsy and other brain disorders.

The impact of exercise on mental health, on cognition, brain function and brain structure as well as the possible underlying molecular systems important for maintaining neural function and plasticity has been extensively examined. Moreover, numerous studies have reinforced t the important and beneficial role of exercise for those with neurological disorders. This article reviews general aspects of physical exercise against neurodegenerative diseases and the relevant contributions of physical exercise programs as complementary therapy for epilepsy. We first give an overview of the plasticity induced by exercise in the damaged brain, the impact of exercise in reducing brain injury as well as in delaying onset of and decline in several neurodegenerative diseases. We address the relationship between epilepsy and exercise and report the neuroprotective and antiepileptogenic effects of exercise on epilepsy based on experimental and clinical studies. Overall, we conclude that physical or sport activities represent an exciting intervention that should be integrated with conventional therapy for the improvement of brain function and resistance to neurodegenerative diseases as well as a complementary non-pharmacological treatment of epilepsy.

Experimental and clinical findings from physical exercise as complementary therapy for epilepsy.

Complementary therapies for preventing or treating epilepsy have been extensively used. This review focuses on the positive effects of physical exercise programs observed in clinical studies and experimental models of epilepsy and their significance as a complementary therapy for epilepsy. Information about the antiepileptogenic and neuroprotective effects of exercise is highlighted. Considering that exercise can exert beneficial actions such as reduction of seizure susceptibility, reduction of anxiety and depression, and consequently, improvement of quality of life of individuals with epilepsy, exercise can be a potential candidate as non-pharmacological treatment of epilepsy.

Social play impairment following status epilepticus during early development.

Neonatal status epilepticus (SE) disrupts prefrontal cortex and thalamus, brain regions related to social play. Juvenile play was evaluated using the "intruder-resident" paradigm following SE in 9-day-old Wistar pups of both genders. Quite interestingly, we demonstrated for the first time that neonatal SE produces social impairment in male rats, reduces locomotor activity in both genders and enhances self-grooming in female. Additional studies are necessary to clarify if these effects can impair social behavior across the life span.

Favorable effects of physical activity for recovery in temporal lobe epilepsy.

Strategies that are efficacious for preventing or treating of epilepsy have been extensively used. This review discusses the positive effects of physical exercise program in experimental models of epilepsy, and considerations of the potential application of physical exercise strategy for preventing or treating temporal lobe epilepsy (TLE) are highlighted. Findings from animal studies indicate that exercise can modulate neuronal vulnerability to epileptic insults. Exercise treatment before a precipitating brain insult demonstrates a reduced brain susceptibility in the kindling or the pilocarpine model of epilepsy. In view of the beneficial effect of exercise during the epileptogenesis process, studies analyzed the influence of exercise after the development of chronic epilepsy. Behavioral analysis showed a reduced frequency of seizures during physical exercise program. Metabolic, electrophysiologic, and immunohistochemical studies have confirmed the positive influence of exercise on epilepsy. Taken into account that exercise can exert beneficial actions such as reduction of seizure susceptibility as observed in animal studies, and improvement of quality of life and reduction of anxiety and depression of individuals with epilepsy, physical exercise can be a potential candidate to be integrated with conventional therapy for epilepsy.

The potential role of physical exercise in the treatment of epilepsy.

The beneficial effects of exercise for people with epilepsy, including reduction of seizure susceptibility, improvement of quality of life, reduction of anxiety and depression, and better social integration, have increasingly been reported. We present data from human and animal studies supporting the role of exercise as a therapy for epilepsy complementary to standard treatments.

Melatonin treatment decreases c-fos expression in a headache model induced by capsaicin.

The aim of the present work was to analyze c-fos response within the trigeminal nucleus caudalis (TNC) of pinealectomized rats and animals that received intraperitoneal melatonin, after intracisternal infusion of capsaicin, used to induce intracranial trigeminovascular stimulation. Experimental groups consisted of animals that received vehicle solution (saline-ethanol-Tween 80, 8:1:1, diluted 1:50) only (VEI, n=5); animals that received capsaicin solution (200 nM) only (CAP, n=6); animals submitted to pinealectomy (PX, n=5); sham-operated animals (SH, n=5); animals submitted to pinealectomy followed by capsaicin stimulation (200 nM) after 15 days (PX + CAP, n=7); and animals that received capsaicin solution (200 nM) and intraperitoneal melatonin (10 mg/kg) (CAP + MEL, n=5). Control rats, receiving vehicle in the cisterna magna, showed a small number of c-fos-positive cells in the TNC (layer I/II) as well as the sham-operated and pinealectomized rats, when compared to animals stimulated by capsaicin. On the other hand, pinealectomized rats, which received capsaicin, presented the highest number of c-fos-positive cells. Animals receiving capsaicin and melatonin treatment had similar expression of the vehicle group. Our data provide experimental evidence to support the role of melatonin and pineal gland in the pathophysiology of neurovascular headaches.

Characterization of convulsions induced by a hexanic extract of Spilanthes acmella var. oleracea in rats

To characterize the convulsions induced by a hexanic extract of Spilanthes acmella var. oleracea, male Wistar rats were injected ip with 50 to 150 mg/kg of the extract and EEG and hehavior were observed for periods as long as 2 h. Following the lower doses (50 and 75 mg/kg) only minor behavioral changes such as grooming and wet dog shakes were observed. Higher doses (100 to 150 mg/kg) induced full tonic-clonic convulsions in a dose-dependent manner which were accompanied by typical electrographic seizures in the EEG. These results confirm that the hexane extract of Spilanthes acmella var. oleracea is able to induce generalized convulsions in rats and can be used as a tool in the development of new models of epilepsy