OBJECTIVETo study the effect of melatonin on the gastrointestinal motility and plasma levels of the stress hormone in overtraining rats.

METHODThirty adult SD rats were randomly divided into three groups (n = 10): control group, over-training group, melatonin intervention group. 30 min before each training, rats in the control and over-training groups were fed with normal saline (15 mg/kg) once a day and 5 times per week, while rats in the melatonin intervention group were administrated with melatonin, perfusion in the intervention group (15 mg/kg). Excessive training group and melatonin intervention group rats were subjected to excessive training at 5 times a week for 6 weeks. After 6 weeks, the gastric emptying rate, small intestinal propulsion ratio and levels of plasma motilin (MTL) and calcitonin gene-related peptide (CGRP), cortisol (CORT) and catecholamines (CA) were observed in all groups.

RESULTSCompared with the control group, the gastric emptying rate, small intestinal propulsion ratio and levels of plasma MTL, CORT and CA were increased significantly (P < 0.01) while the content of CGRP was reduced (P < 0.01) in over-training group. After treated with melatonin, this trend was reversed, that was, the gastric emptying rate, small intestinal propulsion ratio and levels of plasma MTL, CORT and CA were surpressed significantly (P < 0.01) while the content of CGRP was improved obviously (P < 0.01) in over-training group.

CONCLUSIONMelatonin plays an important role in protecting gastrointestinal tract from dysfunction, in which MTL, CGRP, CORT and CA are all involved.

Animals ; Calcitonin Gene-Related Peptide ; blood ; Catecholamines ; blood ; Fatigue ; Gastrointestinal Motility ; Hydrocortisone ; blood ; Melatonin ; pharmacology ; Motilin ; blood ; Physical Conditioning, Animal ; Rats ; Rats, Sprague-Dawley ; Stress, Physiological

Animals ; Blood Glucose ; Diet, High-Fat ; Ghrelin ; blood ; Lipids ; blood ; Physical Conditioning, Animal ; Rats

Female ; Hamartoma ; Humans ; Infant, Newborn ; Mouth Diseases ; Palate, Soft

Cause of Death ; Female ; Hospital Mortality ; Hospitalization ; statistics & numerical data ; Humans ; Infant, Newborn ; Inpatients ; statistics & numerical data ; Male

Objective To study pathogensand diagnostic value of beta2-microglobulin(?2-MG) in cerebrospinal fluid(CSF) in children with aseptic meningitis(AM).Methods Polymerase chain reaction (PCR) or reverse transcription-PCR (RT-PCR) assay,enzyme linked immunosorbent assay (ELISA) and passive particle agglutination were employed respectively to detect herpes simplex virus type-1(HSV-1) DNA,enterovirus(EV) RNA in CSF and the specific antibodies of HSV-1 and mycoplasma pneumonia(MP) in blood and CSF from 80 children with AM (AM group) and 20 cases of complete remission acute leukaemia(control group).Children with AM were divided into the EV meningitis group,HSV-1 meningitis group and MP meningitis group according to respective diagnostic criteria.The levels of ?2-MG in CSF from all groups were detected by radio immunoassay.SPSS 13.0 software was used to analyze the data.Results The infection rate of EV,HSV-1 and MP were 52.5%,11.25%and 5.0%,respectively in children with AM.The infection rate of EV was highest.The sensitivity of PCR was higher than ELISA.There could be false negative PCR results in bloody CSF specimens with HSV-1 DNA.The levels of ?2-MG in CSF was significantly higher in children with AM than that in control group(P

Catechol-type siderophores secreted by a strain of soil bacteria in three different medium were assayed by two high-resolution TLC.The results showed different medium had a significant effect on the secretion of catechol-type siderophores,and in three different medium strain S1 produced different catechol-type siderophores.The effect of Al~(3+) on Catechol-type siderophores by S1 were also assayed.The results showed Al~(3+)had a significant stimulation on the secretion of catechol-type siderophores.Moreover,Al~(3+)could to some extent counteract the repression of Fe~(2+)on siderophores production.In KMB medium four catechol-type siderophores were identified and all ones except for 2,3-dihydroxybenzoic acid(2,3-DHBA) had high affinity for Al~(3+).

OBJECTIVE: To investigate the influence of tripterygium glucoside tablet on the pharmacokinetics of atorvastatin in rats. METHODS: Twelve rats were equally randomized to two groups (six rats in each group), including the atorvastatin-only group (A) and the tripterygium glucoside tablet and atorvastatin group (B). Animals in group A were administered according the oral dose of 2 mg·kg-1; and animals in group B were administered at an oral dose of atorvastatin (2 mg·kg-1)and tripterygium glucoside tablet (2 mg·kg-1). Blood samples were collected into a heparinized tube via the oculi chorioideae vein at different time points after drug administration, and the plasma concentration of atorvastatin were determined using HPLC-UV. Finally, the pharmacokinetic profiles of atorvastatin were calculated and compared. RESULTS: Compared with the atorvastatin-only group(A), the pharmacokinetic parameters of the tripterygium glucoside tablet and atorvastatin group(B) have changed greatly. ρmax of atorvastatin increased from (4.77±0.64) to (7.79±0.61) mg·L-1, and AUC0-t increased from (12.82± 3.50) to (27.39±5.76) mg·h·L-1, at the same time, tmax was extended from (0.25±0.03) to (0.52±0.07) h, t1/2 was prolonged from (2.39±0.19) to (5.09±1.35) h, MRT was extended from (2.93±0.23) to (4.36±0.44)h. It indicates that the metabolism of atorvastatin may be suppressed. CONCLUSION: The RESULTS indicate that tripterygium glucoside tablet could influence the pharmacokinetics of atorvastatin when atorvastatin and tripterygium glucoside tablet are used concomitantly. This study could be used for clinical medication guidance of tripterygium glucoside tablet and atorvastatin to avoid the occurrence of adverse reactions.

Objective To detect characteristics and the pathogenesis of rhodopsin (RHO) gene mutation in an inbreeding family with autosomal recessive retinitis pigmentosa (ARRP). Methods Peripheral venous blood 5-8 ml was abstracted from 8 members in the inbreeding ARRP family and 10 control individuals. DNA gene group was picked. Extron 1-5 of RHO gene was amplified by polymerase chain reaction (PCR),and the mutation of RHO gene was screened by direct DNA sequence measurement. Results The Gln-344-Arg mutation in the RHO gene was detected in 3 patients with ARRP and homozygotes of the mutation in 3 patients were found. Heterozygous of the mutation was detected in the parent of patients and 1 healthy family member. No mutation of RHO gene was found in 2 healthy family members and 10 control individuals. Conclusions The Gln-344-Arg mutation in the RHO gene may be the pathogenic factor of the ARRP family; the frequency of the mutation of RHO gene may increase in the inbreeding ARRP family.

Objective To investigate the relationship between gliosis, synaptic reorganization and the mechanism of chronic temporal lobe epilepsy induced by kainic acid. Methods The mossy fibers sprouting, synaptic reorganization and gliosis were observed by Neo-Timm staining and immunohistochemical staining respectively. Results The injected (ipslateral) side was injured predominantly in the CA 3 subfield and hilus, whereas the CA 1 subfield was injured mildlyThe contralateral side showed pathological changes mainly in the CA 1 subfield and hilus, and moderately in the CA 3 subfieldThe longer the rats survived, the more obvious changes were observed in the hippocampuses. Conclusion The injection of kainic acid in hippocampus can cause neuronal loss, reactive gliosis and plasticity of neurons, probably form the abnormal neuronal discharge circuit, finally induce the seizures

During aging, cardiac contractile response to β-AR stimulation is decreased in humans and animal models. Recent studies demonstrate that the positive inotropic effects of both β1-AR and β2-AR stimulation are significantly decreased with aging.This is accompanied by decreases in both β-AR subtype densities and a reduction in membrane adenylyl cyclase activity. However,neither G protein-coupled receptor kinases (GRKs) nor inhibitory G proteins (Gi) appears to contribute to the age-associated reduction in the β-AR modulation of contraction. Thus, while both aging and chronic heart failure exhibit a diminution in cardiac β-AR responsiveness, only heart failure exhibits increased GRK-mediated desensitization ofβ-Ars and an upregulation of Gi proteins.