Objecttve To explore the roles of p53,Bax and Bcl-2 in rat lens epithelial cells apoptosis induced by ultraviolet radiation.Methods Healthy SpragueDawley rats (40,6-weeks old,150 g) were selected and divided into 5 groups randomly.After SD rats were injected 100 g · L-1 chloral hydrate (0.35 mL/100 g) intraperitoneally and pupil dilation,the eyes of SD rats were radiated 15 minutes by using UV-B (300-320 nm).The exposed animals were sacrificed at 1 day,3 days,5 days and 7 days after exposure.Both lenses from all animals were extracted.The apoptosis of rats lens epithelial cells was performed by Hoechst 33258 staining.The expression of p53,Bax and Bcl-2 in rat lens epithelial cells at mRNA level was detected by real-time PCR.The distribution and expression of p53,Bax and Bcl-2 were observed by immunohlstochemistry.Results The apoptosis of lens epithelial cells was aggravated after exposure.The expression of p53 and Bax at mRNA and protein level was increased after UV exposure (P ＜ 0.01).But for Bcl-2 the expression both at mRNA and protein level was decreased after a 1 day-exposure(P ＜0.01) and was increased after UV exposure of 5 days and 7 days(P ＜ 0.01).The mRNA expression level of p53 was positively correlated with the Bax (r =0.952,P ＜ 0.01).The expression of p53 and Bax protein were increased after UV exposure,and transferred from cytoplasm to nucleus;While the expression of Bc1-2 protein was decreased at 1 day after UV exposure,and increased gradually at 3 days,5 days and 7 days.Conclusion The apoptotic process of rat lens epithelial cells induced by ultraviolet may be related with p53 regulating the expression of Bax/Bcl-2.

Purpose: To intelligently diagnose whether there is bladder outlet obstruction (BOO) in female with decent detrusor contraction ability by focusing on urodynamic study (UDS) data. Materials and Methods: We retrospectively reviewed the UDS data of female patients during urination. Eleven easily accessible urinary flow indicators were calculated according to the UDS data of each patient during voiding period. Eight diagnosis models based on back propagation neural network with different input feature combination were constructed by analyzing the correlations between indicators and lower urinary tract dysfunction labels. Subsequently, the stability of diagnostic models was evaluated by five-fold cross-validation based on training data, while the performance was compared on test dataset. Results: UDS data from 134 female patients with a median age of 51 years (range, 27–78 years) were selected for our study.Among them, 66 patients suffered BOO and the remaining were normal. Applying the 5-fold cross-validation method, the model with the best performance achieved an area under the receiver operating characteristic curve (AUC) value of 0.949±0.060 using 9 UDS input features. The accuracy, sensitivity, and specificity for BOO diagnosis model in the testing process are 94.4%, 100%, and 89.3%, respectively. Conclusions The 9 significant indicators in UDS were employed to construct a diagnostic model of female BOO based on machine learning algorithm, which performs preferable classification accuracy and stability.

BACKGROUND:Bone defects are caused by many factors,such as inflammation,tumor,trauma or bone diseases.Erythropoietin can promote the differentiation of mesenchymal stem cells into osteoblasts and osteoclasts and act on vascular endothelial cells to induce angiogenesis and accelerate the repair of bone and cartilage defects.Erythropoietin is a growth factor with potential application in bone tissue engineering construction. OBJECTIVE:To expound the application and potential mechanism of erythropoietin in bone tissue engineering. METHODS:The first author searched the related articles published in CNKI,WanFang,VIP,and PubMed databases from 2004 to 2022 by computer.Search terms were"erythropoietin,bone defect,bone regeneration,angiogenesis,osteogenesis,osteoblast,osteoclast,bone tissue engineering"in Chinese and English.Finally,64 articles were included for review. RESULTS AND CONCLUSION:(1)Erythropoietin can directly act on osteoblasts and osteoclasts in the bone marrow microenvironment by promoting the differentiation of mesenchymal stem cells into osteoblasts,osteoclasts,adipocytes,nerve cells and stromal cells.The activation of Wnt/β-catenin,hypoxia-inducible factor 1α/vascular endothelial growth factor,p38 MAPK and EphrinB2/EphB4 signaling pathways mediates the osteogenic differentiation of mesenchymal stem cells.(2)Erythropoietin can not only regulate the production of erythrocytes to alter the oxygen-carrying capacity of blood but also stimulate vascular endothelial cells to promote angiogenesis.The new blood vessels can carry oxygen,nutrients,growth factors,and bone progenitor cells necessary for osteogenesis to the osteogenic site,thereby promoting bone formation and fracture healing.(3)Currently,erythropoietin is being used as a growth factor with osteogenic and angiogenic effects in various types of scaffold materials such as chitosan,polycaprolactone,bioceramics,and nanofibers through various drug delivery methods.Erythropoietin,along with other growth factors such as bone morphogenetic protein-2 and bone morphogenetic protein-9,has been applied to the surface of scaffold materials to participate in the repair of bone defects.Erythropoietin has demonstrated excellent practicality in the construction of new tissue-engineered bone and has potential clinical application value.

Objective To understand the current status of receiving no methadone maintenance treatment (MMT) and influencing factors in HIV infected injecting drug users (IDUs) in Dehong Dai and Jingpo autonomous prefectures,Yunnan province.Methods Data of survival of IDUs with AIDS in Dehong were collected from "Chinese National Comprehensive HIV/AIDS and Care Information System" in December,2014.Results There were 987 IDUs who should receive MMT,the majority of them were males (94.6％,934/987),aged 35-44 years (53.0％,523/987) and farmers (77.2％,762/987).Among the 987 IDUs,60.2％ (592/987) received no MMT.Multivariate logistic regression analysis showed that being female (OR=2.66,95％CI:1.21-5.87),in Jingpo ethnic group (OR=3.05,95％CI:1.97-4.71) were the major risk factors for receiving no MMT;not being farmers (OR=0.46,95％CI:0.31-0.70),in Dai ethnic group (OR=0.53,95％CI:0.36-0.79),diagnosed HIV infection history ≥ 10 years (OR=0.60,95％CI:0.45-0.81) were the major protective factors for receiving no MMT.The reasons for receiving no MMT included long distance journey (289,48.8％),fear of exposure (124,20.9％),poor daily medication compliance (59,10.0％),fear of side effects (47,7.9％),others (73,12.3％).Conclusions The proportion of receiving no MMT in IDUs with AIDS in Dehong was high.Being female and farmer,in Jingpo ethnic group,low educational level,short diagnosed HIV infection history were influencing factors for receiving no MMT.The effective intervention measures should be taken to further improve MMT coverage according to the different characteristics of the patients.

Objective:To investigate the diagnostic value of neutrophil CD64 index in sepsis patients in intensive care unit (ICU).Methods:A prospective case-control study was conducted, the patients admitted to ICU of Jiangbei People's Hospital Affiliated to Nantong University from December 2016 to June 2020 were enrolled. According to the criteria of Sepsis 3, 107 patients diagnosed with sepsis were classified as the sepsis group, 112 patients without infection were classified as control group. Peripheral venous blood samples were collected within 24 hours after ICU admission, neutrophil CD64 index, C-reactive protein (CRP), procalcitonin (PCT), white blood cell count (WBC) were detected. Receiver operating characteristic curve (ROC curve) was used to evaluate the diagnostic value of neutrophil CD64 index, CRP, PCT and WBC for sepsis.Results:The neutrophil CD64 index, CRP and PCT in sepsis group were significantly higher than those in control group [neutrophil CD64 index: 9.03±5.59 vs. 3.18±1.50, CRP (mg/L): 146.9±68.3 vs. 46.5±35.8, PCT (ng/L): 31.82±14.71 vs. 1.87±1.42, all P < 0.05]. ROC curve analysis showed that neutrophil CD64 index, CRP and PCT had certain diagnostic value for sepsis, the area under ROC curve (AUC) were 0.924, 0.915 and 0.879, respectively, the 95% confidence intervals (95% CI) were 0.871-0.978, 0.855-0.975, 0.807-0.951, respectively, P values were 0.016, 0.017 and 0.026, respectively. Among the three indicators, the diagnostic value of neutrophil CD64 index was much higher. When the optimal cut-off value was 4.32, the sensitivity and specificity were 83.6% and 88.7%, respectively, which were higher than the sensitivity (75.1%, 76.3%) and specificity (87.2%, 82.5%) of CRP and PCT. Conclusion:Neutrophil CD64 index is a valuable biomarker for the diagnosis of sepsis in ICU.