Objective:To evaluate the occluding effect of 2 kinds of Er laser on dentinal tubules.Methods:27 dentine discs were prepared,etched with 0.5 mol/L EDTA and then divided into 3 groups(n =9).The samples in group A without treatment were used as the controls,in group B treated with Er:YAG laser irradiation and in group C treated with Er,Cr:YSGG laser irradiation.The occluding effect was examined by scanning electron microscopy (SEM).Results:Micrographs of SEMshowed obvious occluding effect in group B and C.The dentinal tubule exposure rates of group A,B and C were 33.61 0% ±7.545%,4.1 86% ±0.723% and 3.798% ± 0.843% respectively(among 3 groups,P <0.01 ;B vs C,P >0.05).Conclusion:The 2 kinds of Er laser can block dentinal tu-bules.

Objective To establish a capillary electrophoresis method to separate ephedrine and psedudoephedrine. Methods RM-β-CD and HP-β-CD were set as additives. A capillary electrophoresis method was set up. The effects of types and concentrations of additives, the concentrations and pH values of buffered solution, running voltage and organic solvent on the separation of ephedrine and psedudoephedrine were investigated.Results Ephedrine and pseudoephedrine could be successfully separated by using either RM-β-CD or HP-β-CD as additives. When RM-β-CD was used as additive, the best separation conditions were as follows: separation voltage 10 kV, 25 mmol/L Tris-H3PO4 (pH 2.42), 20 mg/mL of RM-β-CD. Under the conditions, the resolution of ephedrine and pseudoephedrine was 1.56 and they were separated successfully within 13 min. When HP-β-CD was used as additive, the best separation conditions were as follows: separation voltage 10 kV, 25 mmol/L Tris-H3PO4 (pH 3.00), 50 mg/mL of HP-β-CD. Under the conditions, the resolution of ephedrine and pseudoephedrine was 2.73 and they were separated successfully within 15 min.ConclusionThis method is reliable, rapid and repeatable. It can be used as separation determination method for ephedrine and pseudoephedrine.

Cell gap junction is a special protein channel.Gap junction-mediated exchange of information between cells is crucial for cell growth,differentiation and tissue homeostasis.Connexin 43 (Cx43) is one of the members of the gap junction protein family.In recent years,researches show that abnormal Cx43 gene expression leads to the cell gap junctional communication dysfunction,which is closely related to the occurrence,metastasis and prognosis of a variety of tumors.Cx43 is expected to become a new target for clinical diagnosis and treatment of tumors.

Objective:To explore the change of blood-brain barrier (BBB) permeability in septic rats.Methods:A rat model of sepsis was established by cecal ligation and puncture. Rats were randomly (random number) grouped according to the intervention time: sham-operated group, sepsis 1-day group, sepsis 4-day group, and sepsis 7-day group. Fluorescein sodium was used to test the permeability of the BBB. Western blot and immunofluorescence methods were applied to detect the expression of tight junction proteins including Claudin-5, Occludin and ZO-1.Results:Compared with the sham-operated group, rats in the sepsis group presented quick breath, slow response, decreased intake of food and water, obvious abdominal distension and loose stools. After abdominal anatomy of sepsis rats, we found mesenteric adhesions, dilatation of proximal intestinal, black cecum ligation site with purulent exudate, enlarged liver and diffused bloody exudate. Compared with the sham-operated group, body weight of sepsis rats was reduced remarkably ( P < 0.05). The body weight of rats of sepsis 7-day group was the lowest, which was significantly lower than that of rats of sepsis 4-day group ( P< 0.05) and 1-day group ( P< 0.05). Compared with the sham-operated group, the content of fluorescein sodium in sepsis 1-day rats was increased remarkably ( P< 0.05). The content of fluorescein sodium in rats of sepsis 7-day group was the highest, which was significantly higher than that in rats of sepsis 4-day group ( P< 0.05) and 1-day group ( P< 0.05). Compared with the sham-operated rats, the expression of Claudin-5, Occludin and ZO-1 in sepsis rats were decreased remarkably (all P < 0.05). The expression of Claudin-5, Occludin and ZO-1 were the lowest in rats of the sepsis 7-day group, which were significantly decreased than those of rats in the sepsis 4-day group (all P< 0.05) and rats in sepsis 1-day group (all P < 0.05). Conclusions:Sepsis rats showed increased permeability of the BBB, and the permeability of BBB increased continuously along with the duration of sepsis.

Objective: This study aimed to explore whether high pressure would increase expression of TNF-a and IL-1β. Methods: BV2 microglia cells were treated with a self-made device. BV2 microglia cells were randomly divided into five groups according to different pressures: control group, 20 mmHg group, 25 mmHg group, 30 mmHg group, and 35 mmHg group. BV2 microglia cells were randomly divided into five groups according to different intervention time: control group, 6 h group, 12 h group, 24 h group. TNF-α and IL-1β expression were assessed by Western Blotting or double immunofluorescence. Results: The 30 mmHg group had the highest expression levels of TNF-α and IL-1β as compared with control group (both P<0.01), 6 h group (both P<0.01)、12 h group (TNF-α: P<0.05; IL-1β: P< 0.01).30 mmHg group had the highest expression levels of TNF-α and IL-1β as compared with control group (bothP<0.01), 20 mmHg group (both P<0.01), and 25 mmHg group (TNF-α: P<0.05; IL-1β: P<0.01). The expression levels of TNF-α and L-1β were not different between 30 mmHg group and 35 mmHg group (both P>0.05). Conclusions High pressure may increase the expression levels of TNF-α and IL-1β of microglia.

OBJECTIVETo analyze the molecular mechanism and prognosis of a child with aortic stenosis and thumb aplasia.

METHODSThe karotypes of the child and his parents were analyzed with routine G-banding. Their genomic DNA was also analyzed with array comparative genomic hybridization(aCGH) for chromosomal duplications/deletions.

RESULTSNo karyotypic abnormality was detected at cytogenetic level for the child and his parents. aCGH identified a de novo 5.86 Mb deletion at 2q22.3-q23.3 in the child.

CONCLUSIONThe child was diagnosed with 2q23.1 microdeletion syndrome. MBD5 may be the key gene for the 2q23.1 microdeletion syndrome.

Objective:To investigate the diagnostic and early-warning value of laboratory test indicators for sepsis-induced myocardial injury (SIMD).Methods:The clinical data of 183 patients with sepsis admitted to the Department of Emergency and Critical Care Medicine of Guangdong Provincial People's Hospital from August 2016 to October 2020 were collected. The patient's age, gender, past medical history, vital signs and pathogen culture results were extracted. Cardiac function, blood routine, liver function, renal function, inflammatory factors, coagulation function, APACHE Ⅱ and SOFA scores were recorded at enrollment and 72 h after admission. SIMD was defined as cTnT ≥300 pg/mL and NT-proBNP ≥1243 pg/mL twice in 72 h intervals between enrolled cases, and the early-warning factors of patients with SIMD were analyzed. The differences in various indicators between the two groups were compared, and Logistic regression analysis was used to explore the diagnostic efficacy of cTnT and NT-proBNP combined for SIMD, and the correlation between PCT/PLT ratio and the occurrence of SIMD.Results:Among 250 patients, 67 patients were excluded for lack of the main indicators, and 183 patients (including 62 patients with history of cardiac disease) were enrolled finally. Among 183 patients with sepsis, 105 patients (57.38%) with cTNT ≥300 pg/mL and NT-proBNP ≥1 243 pg/mL, were diagnosed as myocardial injury; after excluding 62 patients with history of cardiac disease, 59 patients (48.76%) with cTNT ≥300 pg/mL and NT-proBNP ≥1 243 pg/mL were diagnosed as myocardial injury. Logistic regression analysis showed that increased PCT/PLT ratio ( OR=1.585, 95% CI: 1.124-2.237, P=0.009) was an independent risk factor for early-warning of SIMD. The PCT/PLT ratio ( OR= 1.850, 95% CI: 1.103-3.102, P=0.020) could stably predict the occurrence of SIMD in patients without previous history of heart disease. ROC curve analysis showed that PCT/PLT ratio could effectively predict the occurrence of SIMD (AUC=0.693, 95% CI: 0.617-0.769, P<0.001), the optimal cut-off value was 0.177 (sensitivity: 65.7%, specificity: 66.7%). The PCT/PLT ratio was still effective in predicting the occurrence of SIMD after excluding patients with previous history of heart disease (AUC=0.733, 95% CI: 0.643-0.823, P<0.001), and the optimal cut-off value was 0.429 (sensitivity: 55.9%, specificity: 83.9%). Conclusions:The combination of cTnT and NT-proBNP has certain diagnostic value for SIMD, and the PCT/PLT ratio could warn the occurrence of SIMD.

Bladder cancer (BC) is the most common malignant tumor of the genitourinary system. The age of individuals diagnosed with BC tends to decrease in recent years. A variety of standard therapeutic options are available for the clinical management of BC, but limitations exist. It is difficult to surgically eliminate small lesions, while radiation and chemotherapy damage normal tissues, leading to severe side effects. Therefore, new approaches are required to improve the efficacy and specificity of BC treatment. Synthetic biology is a field emerging in the last decade that refers to biological elements, devices, and materials that are artificially synthesized according to users' needs. In this review, we discuss how to utilize genetic elements to regulate BC-related gene expression periodically and quantitatively to inhibit the initiation and progression of BC. In addition, the design and construction of gene circuits to distinguish cancer cells from normal cells to kill the former but spare the latter are elaborated. Then, we introduce the development of genetically modified T cells for targeted attacks on BC. Finally, synthetic nanomaterials specializing in detecting and killing BC cells are detailed. This review aims to describe the innovative details of the clinical diagnosis and treatment of BC from the perspective of synthetic biology.
Humans ; Synthetic Biology ; Urinary Bladder Neoplasms/diagnosis*

ObjectiveTo determine the syndrome of a rat model of follicular dysplasia induced by Tripterygium glycosides based on prescriptions and investigate the mechanism of traditional Chinese medicine intervention via the adenosine monophosphate-activated protein kinase （AMPK）/mammalian target of rapamycin （mTOR）/hypoxia-inducible factor-1 （HIF-1）/vascular endothelial growth factor （VEGF） pathway. MethodForty-eight rats with regular estrous cycles were randomly assigned into a normal group （n=8） and a modeling group （n=40）. The rats in the modeling group were administrated with Tripterygium glycoside suspension （75 mL·kg^-1） by gavage for 30 days. The modeled rats were assigned into model， Siwutang （3.69 g·kg^-1）， Youguiyin （3.11 g·kg^-1）， Zuoguiyin （7.29 g·kg^-1）， and Guishenwan （10.35 g·kg^-1） groups， with 8 rats in each group. The drug intervention lasted for 14 days. The changes of estrous cycle were detected by Pap staining， and a stereoscope was used to observe the morphology of the ovarian tissue. Hematoxylin-eosin staining was employed to observe the pathological changes and follicle count in the ovarian tissue. Enzyme-related immunosorbent assay （ELISA） was used to measure the levels of follicle-stimulating hormone （FSH）， luteinizing hormone （LH）， and estradiol （E₂） in the serum. Real-time fluorescence quantitative polymerase chain reaction and Western blot were employed to determine the mRNA and protein levels， respectively， of AMPK， mTOR， HIF-1， and VEGF in the ovarian tissue. ResultCompared with the normal group， the model group had a disordered estrous cycle， reduced secondary and mature follicles， increased atretic follicles， elevated FSH and LH levels， lowered E₂ level， up-regulated mRNA and protein levels of AMPK， and down-regulated mRNA and protein levels of mTOR， HIF-1， and VEGF （P<0.01）. Compared with the model group， Guishenwan increased secondary and mature follicles， decreased atretic follicles， lowered the FSH and LH levels， elevated the E₂ level， down-regulated the mRNA and protein levels of AMPK， and up-regulated the mRNA and protein levels of mTOR， HIF-1， and VEGF （P<0.01）. Compared with Guishenwan group， Siwutang， Youguiyin， and Zuoguiyin decreased mature follicles， increased atretic follicles （P<0.01）， elevated the LH （P<0.01） and FSH （P<0.05） levels， and lowered the E₂ level （P<0.05）. In addition， Youguiyin up-regulated the protein level of AMPK （P<0.05） and down-regulated the mRNA levels of mTOR and HIF-1 （P<0.01） as well as the mRNA and protein levels of VEGF （P<0.01）. Siwutang down-regulated the mRNA levels of mTOR and HIF-1 as well as the mRNA and protein levels of VEGF （P<0.05）. Zuoguiyin down-regulated the mRNA level of mTOR and the protein and mRNA levels of VEGF （P<0.05）. ConclusionGuishenwan may improve the ovarian function and promote follicle maturation in a rat model of follicular dysplasia by inhibiting the AMPK/mTOR/HIF-1/VEGF pathway， with the therapeutic effect superior to Zuoguiyin， Youguiyin， and Siwutang. It was hypothesized that this model presented the syndrome of kidney-essence deficiency.

BACKGROUND: Sarcopenia is an age-related progressive skeletal muscle disorder involving the loss of muscle mass or strength and physiological function. Efficient and precise AI algorithms may play a significant role in the diagnosis of sarcopenia. In this study, we aimed to develop a machine learning model for sarcopenia diagnosis using clinical characteristics and laboratory indicators of aging cohorts. METHODS: We developed models of sarcopenia using the baseline data from the West China Health and Aging Trend (WCHAT) study. For external validation, we used the Xiamen Aging Trend (XMAT) cohort. We compared the support vector machine (SVM), random forest (RF), eXtreme Gradient Boosting (XGB), and Wide and Deep (W&D) models. The area under the receiver operating curve (AUC) and accuracy (ACC) were used to evaluate the diagnostic efficiency of the models. RESULTS: The WCHAT cohort, which included a total of 4057 participants for the training and testing datasets, and the XMAT cohort, which consisted of 553 participants for the external validation dataset, were enrolled in this study. Among the four models, W&D had the best performance (AUC = 0.916 ± 0.006, ACC = 0.882 ± 0.006), followed by SVM (AUC =0.907 ± 0.004, ACC = 0.877 ± 0.006), XGB (AUC = 0.877 ± 0.005, ACC = 0.868 ± 0.005), and RF (AUC = 0.843 ± 0.031, ACC = 0.836 ± 0.024) in the training dataset. Meanwhile, in the testing dataset, the diagnostic efficiency of the models from large to small was W&D (AUC = 0.881, ACC = 0.862), XGB (AUC = 0.858, ACC = 0.861), RF (AUC = 0.843, ACC = 0.836), and SVM (AUC = 0.829, ACC = 0.857). In the external validation dataset, the performance of W&D (AUC = 0.970, ACC = 0.911) was the best among the four models, followed by RF (AUC = 0.830, ACC = 0.769), SVM (AUC = 0.766, ACC = 0.738), and XGB (AUC = 0.722, ACC = 0.749). CONCLUSIONS: The W&D model not only had excellent diagnostic performance for sarcopenia but also showed good economic efficiency and timeliness. It could be widely used in primary health care institutions or developing areas with an aging population. TRIAL REGISTRATION Chictr.org, ChiCTR 1800018895.
Humans ; Aged ; Sarcopenia/diagnosis* ; Deep Learning ; Aging ; Algorithms ; Biomarkers