naloxone has been researched along with Seizures--Febrile* in 2 studies
2 other study(ies) available for naloxone and Seizures--Febrile
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[Neuroprotective effect of naloxone in brain damage caused by repeated febrile seizure].
The brain damage caused by repeated febrile seizure (FS) during developing age is harmful to the intellectual development of children. So how to decrease the related damage is a very important issue. The main purpose of the present study was to find out whether the non-specific opiate antagonist naloxone at low dose has the neuroprotective effect on seizure-induced brain damage.. Warm water induced rat FS model was developed in this study. Forty-seven rats were randomly divided into two groups: normal control group (n = 10) and hyperthermic seizure groups (n = 37). The latter was further divided into FS control group (n = 13) and naloxone-treated group (n = 24). The dose of naloxone is different in two naloxone-treated groups (12/each group), in one group the dose was 1 mg/kg, in the other one 2 mg/kg. Seven febrile seizures were induced in each rat of hyperthermic seizure groups with the interval of 2 days. The rats were weighed and injected intraperitoneally with naloxone once the FS occurred in naloxone-treated group, while the rats of the other groups were injected with 0.9% sodium chloride. Latency, duration and grade of FS in different groups were observed and compared. HE-staining and the electron microscopy (EM) were used to detect the morphologic and ultrastructural changes of hippocampal neurons.. In naloxone-treated group, the rats' FS duration and FS grade (5.02 +/- 0.63, 2.63 +/- 0.72) were significantly lower (t = 5.508, P < 0.01; t = 8.439, P < 0.01) than those in FS control group (7.70 +/- 2.25 min, 4.52 +/- 0.49), although no significant gap was observed on FS latency between them. In FS control group, HE-staining pattern of hippocampal CA(1) and CA(2) showed lots of disordered neurons with confused polarity and vacuoles formed. Nuclei were with various size, some rounded and some oblong. While in naloxone-treated groups, the arrangement of neurons was regular, only a small quantity of neurons had changed polarity and vacuoles formed. Most nuclei were oblong and in the same size. In hippocampal CA(1) region and dentate gyrus of rats from FS control group, EM showed that the most mitochondrion volumes obviously increased with vacuoles formed, the matrix condensed, the ridge obscured or disappeared, apoptosis body emerged. Minor to moderate dilation of rough endoplasmic reticulum and Golgi's complex was also observed. However, in naloxone-treated groups, the number of neurons with swollen mitochondrion and endoplasmic reticulum was much fewer than that in FS control group. No apoptosis body was observed. The comparison between them showed much lighter brain damage in naloxone-treated groups than in FS control group.. Although low-dose naloxone could not totally stop the occurrence of febrile seizure, it could lighten the brain damage resulted from repeated FS to some extent. Topics: Animals; Brain; Male; Models, Animal; Naloxone; Narcotic Antagonists; Neuroprotective Agents; Random Allocation; Rats; Rats, Sprague-Dawley; Seizures, Febrile; Treatment Outcome | 2004 |
Naloxone prevents hyperthermia induced convulsions in the immature rat.
There is increasing evidence suggesting that endogenous opioid peptides play a role both in temperature regulation and in the etiopathology of seizures. We have studied the effects of the opioid antagonist naloxone on hyperthermia-induced seizures in unrestrained 15 day old rat pups. Saline injected control animals exposed to an ambient temperature of 40 degrees C for one hr showed a gradual increase in body temperature reaching a maximum of 42 degrees C at 50 min of exposure; at this time, all animals had convulsions and 86% died. Animals pre-treated with 10 mg/kg naloxone reached a maximum core temperature of 41 degrees C after 60 min at 40 degrees C and no convulsions or deaths were observed. When animals were exposed for 60 min to a 27 degrees C environment, saline controls maintained their normal body temperature throughout the experiment, while 5 mg/kg naloxone produced a marked hyperthermic effect. These experiments suggest that endogenous opioids may play a role in both temperature adaptation and hyperthermia-induced seizures in the rat pup. Topics: Adaptation, Physiological; Animals; Disease Models, Animal; Hot Temperature; Naloxone; Rats; Rats, Inbred Strains; Seizures, Febrile | 1986 |