OBJECTIVEIn this research, we have observed changes of PHF8、H3K9me2、BDNF, and their regulatory roles in changing the amplitude value of LTP in hippocampus due to aluminum exposure so that we can discuss the impact on the learning and memory that caused by chronic aluminum exposure.

METHODSForty healthy SPF grade SD male rats were randomly divided into four groups by weight, including control group and low, medium, high dose aluminum exposed group, each group had 10 rats. The exposed rats drank water containing different doses of aluminum chloride (AlCl3) (2、12、72 mg/kg Al(3+)) for 90 d. We measured LTP in hippocampus by electrophysiological grapier and detected the expression of PHF8、H3K9me2、BDNF by western-blot.

RESULTSElectrophysiological measurements shows that compared with that of control group, the average of fEPSPs was decreased at different time points in all exposed groups (P<0.01) . The results of western-bolt test demonstrated that the expression of PHF8 in the exposed groups were significantly lower than those of control group (P<0.01) . And the expression the of H3K9me2 of medium and high dose groups were significantly higher than control group (P<0.05) . While the expression of BDNF of medium and high dose groups were decreased compared with the control group (P<0.05) .

CONCLUSIONChronic aluminum exposure can reduce the LTP via the route of PHF8-H3K9me2-BDNF in the hippocampus of rats, which then may impair the ability of learning and memory.

Aluminum ; toxicity ; Aluminum Compounds ; toxicity ; Animals ; Brain-Derived Neurotrophic Factor ; metabolism ; Chlorides ; toxicity ; Hippocampus ; drug effects ; metabolism ; Histone Demethylases ; metabolism ; Learning ; drug effects ; Long-Term Potentiation ; drug effects ; Male ; Memory ; drug effects ; Pilot Projects ; Rats ; Rats, Sprague-Dawley ; Transcription Factors ; metabolism

OBJECTIVETo investigate the effect of aluminum exposure on neuronal apoptosis of rats hippocampus and the correlation of and synaptic plasticity.

METHODSThere were 40 SPF grade SD rats which were randomly divided into four groups: the control group, the low dose group, the medium dose group and the high dose group, 10 rats in each group. The rats were daily gavaged with aluminum lactate for 30 days. The hippocampal fEPSPs in rat was measured by electrophysiological grapher and the neuronal apoptosis in hippocampus was detected by Flow cytometer. In addition, the relative expression of gene which includes caspase-3, 8, 9 was measured by Real-time PCR.

RESULTSCompared to the control group, the average of fEPSPs which after HFS 10, 20, 30, 40, 50, 60 min was decreased at different time point in the low dose group, the medium dose group and the high dose group (P < 0.05). Compared with the control group, the rate of apoptosis was significantly increased in the medium dose group and the high dose group (P < 0.05). Compared to the control group, the relative expression of caspase-3 in the medium dose group and the high dose group was significantly increased in Real-time PCR (P < 0.05), and the relative expression of caspase-8 in the high dose group was significantly increased (P < 0.05).

CONCLUSIONAluminum exposure may induced neuronal apoptosis in rats, and then affect hippocampal synaptic plasticity.

Aluminum ; toxicity ; Aluminum Compounds ; toxicity ; Animals ; Apoptosis ; Caspase 3 ; metabolism ; Caspase 8 ; metabolism ; Hippocampus ; cytology ; drug effects ; Lactates ; toxicity ; Neuronal Plasticity ; drug effects ; Neurons ; cytology ; drug effects ; Rats ; Rats, Sprague-Dawley

Objective: To understand and analyze the epidemiological characteristics of dental caries in children and its effects on jaw function, so as to prevent occurrence of abnormality of jaw function. Methods: In October 2020, 860 cases of children from 5 kindergartens and 3 primary schools in Beijing were selected by adopting the convenience sampling method. All of them received oral examination, and the questionnaire according to the fourth national oral health epidemiological survey standard, including demographic information, eating habits, oral hygiene habits, oral health care,etc. The epidemiological characteristics of dental caries in children and its effects on jaw function were analyzed. Results: A total of 190 children had dental caries, with a dental caries incidence rate of 22.09%. Dental caries in children s deciduous teeth or permanent teeth was related to age, residence, parents education level,whethe to eat before going to bed, whether eating sweet food, tooth brushing age, daily brushing frequency, whether parents have assisted tooth brushing, whether regular oral examination, whether parents have received oral health guidance( χ 2= 5.04 ,4.70，75.37，7.91，12.03，9.30，7.64，255.47，253.27，11.38, P <0.05). Compared with the noncaries group[(81.52±3.16， 80.54± 1.52，1.92±0.25，31.52±1.62，33.63±3.41，50.72±1.68)°], the sella nasion A point(SNA), sella nasion B point(SNB),A point nasion B point(ANB),frankfot horizontal mandibular plane angle(FH MP),skull nasion mandibular plane angle(SN MP),anteriors relationship palataplane mandibular(Ptm ANS) decreased in the dental caries group[(78.62±2.11，79.35±1.02，1.68±0.32，30.69±0.45，32.15±3.02，48.62±1.21)°](t=78.62,79.35,10.94, 30.69, 32.15, 48.62, P<0.05). Conclusion The prevalence of caries in children was high and jaw structure abnormalities and dysfunction. It is suggested that caries prevention and control work should be carried out early to strengthen the prevention and control of oral disease education work.

Objective:To explore the experience of self-management dilemma ofadults with emerging ankylosing spondylitis, and to provide reference for the construction of self-management intervention strategies for emerging adults with ankylosing spondylitis.Methods:Descriptive phenomenology was used to conduct in-depth interviews with 14 adults with emerging ankylosing spondylitis in the Rheumatology and Immunology Department of Drum Tower Hospital Affiliated to Medical College of Nanjing University from August 2022 to March 2023. The interview data were analyzed by Colaizzi′s seven-step analysis method.Results:A total of 14 patients completed the interview,10 males, 4 females, aged 21-30 years. In adults with emerging ankylosing spondylitis, there were dilemmas of role maladjustment and disease management disorder, including role maladjustment of disease management and social role maladjustment. Barriers to disease management included weak self-management awareness, insufficient support for self-management information, inadequate self-management skills, and poor compliance with self-management behaviors.Conclusions:The role adaptation and self-management ability of adults with emerging ankylosing spondylitis are seriously inadequate. It is urgent to construct health management strategies for adults with emerging ankylosing spondylitis to help them improve the level of role adaptation and disease management.

Objective: To evaluate the 5-year survival and success rates of transplanted autologous teeth with complete root formation. Methods: A total of 32 patients admitted to the hospital for 36 cases of tooth autotransplantation with complete root formation from November 2008 to October 2012 were enrolled in this study. Clinical and radiographic examinations were performed during the post-operative follow up periods of 1 month, 3 months, 6 months, 9 months and 12 months, respectively. Survival analysis was then conducted and the predictive factors influencing prognosis from the aspects of age, sex and root canal treatment status were investigated. Kaplan-Meier survival curve was adopted for survival analysis and Log-Rank test was used to compare the survival rate and success rate of each single factor. Results: According to each case′s last follow-up, the 5-year survival rate of autotransplanted teeth with complete root formation was 83%. Within these cases, the 5-year success rate of the autotransplanted teeth with no apparent periodontitis or apical periodontitis, and the crown to root ratio being less than 1 was 65%. Factors of age and sex of the patients showed no correlation with the prognosis of autotransplantation (P>0.05). Root canal treatment was crucial in preventing transplanted teeth from apical periodontitis and root resorption, and accordingly increased the success rate (P=0.028) of autotransplantation. Conclusions Autotransplantation with complete root formation has a high 5-year survival rate, and is a viable and alternative method for restoration of tooth loss. Post-operative follow-up should be thoroughly planned and root canal treatment should be performed in order to increase the survival rate and success rates of autotransplantation.