To improve the clinical skills of medical students and to train qualified and profes-sional ophthalmologist,the school of optometry and ophthalmology in Wenzhou Medical College car-ried out reforms and innovations in clinical practice and training. In order to strengthen and train clin-ical thinking and clinical skills,and to cultivate the humanistic qualities of medical students,the di-verse-training mode were applied in clinical practice and training. In this paper explored the design goal, objective and actual effect of diverse-training mode for clinical practice and training.

Objective To explore the effects of different doses of contrast agent (CA) on types of time-signal intensity curves (TICs) and semi-quantitative parameters after dynamic contrast-enhanced MRI (DCE-MRI) on Walker 256 murine breast tumor model.Methods A total of 12 rats burdened Walker256 breast cancer models were established and divided into 3 groups randomly, 4 in each group.Routine MR and DCE-MRI scans of the rats using Bruker Pharmascan 7T MR scanner were performed.Doses for the 3 groups were 0.2, 0.3, and 0.5 mmol/kg, respectively.MR data, TICs types and semi-quantitative parameters from each different dose group were statistically studied and compared to observe the differences.Results Tumors were enhanced significantly after injection.The types of TICs in all tumors were the Ⅲ pattern which was not influenced by CA doses.Semi-quantitative parameters of first enhancement (Efirst), maximal enhancement (Emax), washout enhancement (Ewash), and signal enhancement ratio (SER) showed statistical differences among the three dose groups (P＜0.05).Semi-quantitative parameters of time to peak (Tpeak) and washout velocity (Vwash) showed no statistical differences among the three dose groups (P＞0.05).Mean signal intensity of each group was highly negatively linear correlated with scan times after the peak (r=-0.972, P=0.000;r=-0.971, P=0.000;r=-0.989, P=0.000).The washout slope (slopewash) showed no statistical differences among the three groups (P＞0.05).Conclusions Injection doses of CA didn't change the TIC type, Tpeak, Vwash, and Slopewash.These parameters are comparable among different medical centers and can be considered as prior parameters to monitor the efficacy of neoadjuvant chemotherapy.

Objective To investigate the influence of atorvastatin in methylation and expression level of Bcl-2 in human umbilical endothelial cells(HUVECs)treated with homocysteine(Hcy)and to expound potential mechanism of atorvastatin resisting arteriosclerosis.Methods After HUVECs were treated with 0, 2, 4, 8, 16, and 32 mmol·L-1 Hcy for 48 h,MTT was used to measure the inhibitory rates of HUVECs and the half inhibitory concentration (IC50 ). According to the experimental results, the HUVECs cultured in vitro were divided into control group (0.00 mmol · L-1 Hcy ), Hcy group (9.00 mmol·L-1 Hcy ), and atorvastatin group (9.00 mmol·L-1 Hcy+1×10-3 mmol·L-1 atorvastatin).After treated for 48 h,flow cytometry was used to detect the apoptotic rate of cells, the mRNA expression of Bcl-2 was analyzed by fluorescence quantitative PCR,the protein expression of Bcl-2 was detected by Western blotting method, and the methylation level of Bcl-2 promoter region was determined by nest touch-down PCR combined with methylation specific PCR (MSP ). Results Compared with control group,the apoptotic rate of HUVECs in Hcy group was increased(P<0.01),the mRNA and protein expression levels of Bcl-2 were significantly decreased(P<0.01),and the Bcl-2 promoter region methylation level was also decreased(P<0.01).Compared with Hcy group,the apoptotic rate of HUVECs in atorvastatin group was decreased(P<0.01),the mRNA and protein expression levels of Bcl-2 gene were increased (P<0.05), and the Bcl-2 promoter region methylation level was also increased (P<0.05). Conclusion Atorvastatin can prevent the apoptosis of HUVECs induced by Hcy through regulating Bcl-2 methylation.

Objective To investigate the significance of serum CD25 / serum ferritin in the diagnosis of lymphoma-associated hemophagocytic syndrome (LAHS),so as to provide the clinical basis for improving its recognition and giving effective therapy. Methods The serums were collected from 70 patients with hemophagocytic syndrom in Beijing Friendship Hospital, Capital Medical University during the period from October 2008 to June 2011, including 31 LAHS cases and 39 other disease-associated HPS cases. The serum CD25 level in HPS patients was measured with enzyme-linked immunosorbent assay (ELISA), and the serum ferritin was measured on the same day. Then the serum CD25/ferritin ratio was calculated and the differences of the serum CD25, serum ferritin and serum CD25/ferritin ratio between two groups were compared. Results The variance of serum CD25 [(15760.52±7851.74) pg/ml vs (12727.41±11285.28) pg/ml,t=-1.78,P=0.075] and serum ferritin levels (1750.00 ng/ml vs 2947.00 ng/ml,Z=-1.490,P=0.136)were not statistically significant between two groups,while the serum CD25/serum ferritin ratio in LAHS patients was significantly higher than the other group(8.57×10-3 vs 2.84×10-3,Z=-2.106,P=0.035).Conclusion The serum CD25/ serum ferritin ratio is statistically higher in LAHS patients, which might be a novel useful marker for predicting underlying malignant lymphoma in HPS patients.

Objective:To analyze the clinical characteristics of pneumatosis cystoides intestinalis in the Tibet Plateau, and to explore the diagnosis and treatment method of this disease.Methods:The medical records of 60 patients with confirmed pneumatosis cystoides intestinalis who were admitted to Tibet Autonomous Region People's Hospital from January 2014 to July 2021 were retrospectively analyzed. A descriptive statistical analysis was made.Results:The male-to-female ratio of 60 patients with pneumatosis cystoides intestinalis was 2.2: 1. The average age of onset was (48.6 ± 14.5) years. The average living altitude was (3 832.3 ± 399.8) meters. All patients were admitted mainly because of gastrointestinal symptoms. Twenty patients had hemorrhoids, chronic hepatitis, and gallstones. Pneumatosis cystoides intestinalis was confirmed by endoscopic examination in 59 patients and by surgery in 1 patient. Among the patients, 43 patients had lesions involving the colon, 2 patients had lesions involving the small intestine, and 1 patient had lesions involving the duodenum. The specific lesion sites were not determined in the remaining 14 patients because of unclear descriptions of the examination results. Two patients were positive for fecal occult blood tests, with a median hemoglobin value of 156.0 g/L. Forty-nine patients were given hyperbaric oxygen therapy, medication, and diet adjustment. Eleven patients were treated surgically. Clinical symptoms were relieved in 43 patients, and 17 patients were lost to follow-up.Conclusion:Pneumatosis cystoides intestinalis is relatively common in Tibet Plateau, and more common in men than in women. It occurs at any age. Clinical manifestations are not specific. The lesions most often involve the colon. The disease is mainly diagnosed by endoscopy. Individualized treatment based on different causes can help improve the prognosis of pneumatosis cystoides intestinalis.

OBJECTIVE: To determine the effect of Ad-E1A gene therapy on in vivo radiosensitivity to nasopharyngeal carcinoma. METHODS: CNE-2Z cells (2 x 10(5)) were subcutaneously injected into nude mice to develop tumor (1-3 mm) 6 days later. The tumor-bearing mice were then randomly divided into 6 groups (10 mice per group) for PBS treatment or treatment with radiotherapy, Ad-E1A, or Ad-beta-gal alone or radiotherapy in combination with Ad-E1A or Ad-beta-gal. The mice were treated with Ad-E1A or Ad-beta-gal (5 x 10(9) plaque forming units) by intratumoral injection twice weekly for 2 weeks at beginning of week 2. The mice treated with radiotherapy in combination with Ad-E1A or Ad-beta-gal received 2 Gy radiotherapy daily for 5 days following the first week of treatment with Ad-E1A or Ad-beta-gal. Control mice received PBS therapy or radiotherapy only after tumor cells were injected. When the size of tumor exceeded 2 cm, the mice were killed and the tumors underwent immunohistochemical analysis for VEGF and CD34 expression and TUNEL assay for apoptosis. RESULTS: The growth delay time was longest in the Ad-E1A plus radiotherapy group. Tumors treated with Ad-E1A plus radiotherapy were 4.7-fold smaller than those treated with radiotherapy alone and 5.3-fold smaller than those treated with Ad-E1A alone. The survival rate of tumor-bearing mice treated with Ad-E1A plus radiotherapy was significantly higher than that of other treatment groups. The vessel density and the VEGF expression were significantly lower in tumors treated with Ad-E1A plus radiotherapy than those treated with radiotherapy alone, Ad-E1A alone, Ad-beta-gal alone, or Ad-beta-gal plus radiotherapy (P<0.01). TUNEL staining revealing apoptosis can be detected in the Ad-E1A group, radiotherapy group, Ad-E1A plus radiotherapy group, and more apoptosis can be detected in tumors treated with Ad-E1A plus radiotherapy than those of other treatment groups. CONCLUSION E1A gene therapy can effectively enhance the nasopharyngeal carcinoma sensitivity to the radiotherapy by down-regulating VEGF expression and inducing apoptosis.
Adenovirus E1A Proteins ; biosynthesis ; genetics ; Animals ; Apoptosis ; physiology ; Cell Line, Tumor ; Genetic Therapy ; methods ; Humans ; Mice ; Mice, Nude ; Nasopharyngeal Neoplasms ; blood supply ; pathology ; radiotherapy ; Neoplasm Transplantation ; Radiation Tolerance ; genetics ; Random Allocation ; Vascular Endothelial Growth Factor A ; genetics ; metabolism

Halohydrin dehalogenase is of great significance for biodegradation of the chlorinated pollutants, and also serves as an important biocatalyst in the synthesis of chiral pharmaceutical intermediates. A putative halohydrin dehalogenase (HheTM) gene from Tistrella mobilis KA081020-065 was cloned and over-expressed in Escherichia coli BL21 (DE3). The recombinant enzyme was purified by Ni-NTA column and characterized. Gel filtration and SDS-PAGE analysis showed that the native form of HheTM was a tetramer. It exhibited the highest activity at 50 degrees C. The nature and pH of the buffer had a great effect on its activity. The enzyme maintained high stability under the alkaline conditions and below 30 degrees C. HheTM catalyzed the transformation of ethyl(S)-4-chloro-3-hydroxybutyrate in the presence of cyanide, to give ethyl (R)-4-cyano-3-hydroxybutyrate, a key intermediate for the synthesis of atorvastatin.
3-Hydroxybutyric Acid ; chemistry ; Bacterial Proteins ; genetics ; metabolism ; Cloning, Molecular ; Escherichia coli ; Hydrolases ; genetics ; metabolism ; Hydroxybutyrates ; chemistry ; Recombinant Proteins ; genetics ; metabolism ; Rhodospirillaceae ; enzymology ; genetics

Objective: To analyze the interaction of fat mass (FM) and fat free mass (FFM) on the aggregation of cardiovascular disease risk factors (CVRFs) among children and adolescents in Yinchuan City, China, so as to provide scientific basis for the prevention of CVRFs and cardiovascular disease in children and adolescents. Methods: A total of 1 822 children and adolescents aged 12 to 18 years in Yinchuan City were randomly selected for questionnaire survey, physical examination, body composition assessment and laboratory tests, through a cluster sampling method from 2017 to 2020. Binary Logistic regression was used to analyze the relationship between FM, FFM and the aggregation of CVRFs, and their interaction was analyzed. Results: After adjusting for sex and age, the risk of having CVRFs aggregation ≥1 in high FM and low FFM group and high FM and high FFM group was 2.01(95% CI =1.46-2.77) and 3.64(95% CI =2.66-4.98) times higher than that in low FM and low FFM group, and the risk of having CVRFs aggregation ≥2 was 1.67(95% CI =1.06-2.63) and 4.20 (95% CI =2.76-6.38) times, respectively( P <0.05). There was a multiplicative interaction between FM and FFM, which increased the risk of CVRFs aggregration ≥1 and ≥2. The adjusted OR and 95% CI were 1.58(1.04-2.40) and 1.95(1.12-3.42), respectively( P <0.05). Conclusion The results indicated the additive and multiplicative interactions between high levels of fat mass and fat free mass on the aggregation of cardiovascular risk factors, which increased the risk of aggregation of cardiovascular risk factors.

Objective: To elucidate age and sex specific characteristics in fat free mass (FFM) among middle and high school adolescents in Yinchuan City, China, and to provide a scientific basis for healthy development, chronic disease prevention and intervention in children and adolescents. Methods: Using a convenient cluster sampling method, 1 175 middle and high school adolescents, aged 10 to 20 years old, from Yinchuan, China, were selected to participate in a questionnaire survey and physical examination, which involved body composition by bioelectrical impedance analysis(BIA). Results: For adolescents aged 12 to 18 years, FFM and the fat free mass percentage (FFMP) of boys increased with age(from 39.78 to 52.63 kg; 77.51% to 83.80%, respectively), the age trends of the FFM and FFMP of body parts were in the similar pattern, and were significantly higher than those of girls(all P <0.05). In girls, the FFM reached a peak of 40.96 kg at 15 years old, and decreased slightly between the ages of 15 and 18 years, the age trends of the FFM of body parts were in the similar pattern, and the FFMP decreased with age (from 75.63% to 71.91 %). In addition, in girls, the age trends of the FFMP of left and right legs were the same as the general trend, while the FFMP of left and right arms increased with age. The FFMP of the trunk reached a minimum of 29.93% at 15 years old and increased from 15 to 18 years old(all P <0.05). Conclusion For middle and high school adolescents aged 12 to 18 years old in Yinchuan City, China, the distribution of FFM changed in accordance with age and gender differences, in accordance with the characteristics of the adolescents growth and development.

Objective:To study the mechanism of metastasis associated lung adenocarcinoma transcript 1 (MALAT1) targeting microRNA-142-3p (miR-142-3p) in ovarian cancer chemotherapy resistance.Methods:A total of 80 ovarian cancer tissues and paired normal tissues were collected in Shaanxi Provincial People′s Hospital from February 2016 to February 2019. The relative expression levels of MALAT1 and miR-142-3p in ovarian cancer tissues and paired normal tissues were detected by real-time fluorescence quantitative polymerase chain reaction (PCR), and the correlation between MALAT1 and miR-142-3p was analyzed. The effects of abnormal expressions of MALAT1 and miR-142-3p on proliferation and chemotherapy sensitivity of 5-fluorouracil (5-FU) and cisplatin of ovarian cancer Hey cells were verified by CCK-8 assay. Dual luciferase reporter gene experiment was used to detect the targeted relationship between miR-142-3p and MALAT1 (Hey cells were divided into four groups: MALAT1 wt, MALAT1 wt+ miR-142-3p mimic, MALAT1 mut, MALAT1 mut+ miR-142-3p mimic). RNA immunoprecipitation assay was use to confirm the binding site of MALAT1 and miR-142-3p.Results:In the ovarian cancer tissues and paired normal tissues, the relative expression levels of MALAT1 were 0.000 52 (0.002 56) and 0.000 47 (0.000 89), with a statistically significant difference ( Z=2.365, P=0.018); the relative expression levels of miR-142-3p were 0.001 19 (0.002 69) and 0.001 61 (0.008 48), with a statistically significant difference ( Z=2.935, P=0.003). The relative expression level of MALAT1 was negatively correlated with miR-142-3p in the ovarian cancer tissues ( r=-0.474, P<0.001). The relative expression level of miR-142-3p in the miR-142-3p mock group was statistically lower than that of MALAT1+ miR-142-3p mimic group (0.004 18±0.001 24 vs. 0.006 51±0.000 28; t=3.174, P=0.017). The relative fluorescence concentrations of MALAT1 wt group and MALAT1 wt+ miR-142-3p mimic group were 2.27±0.86 and 31.10±6.05 respectively, with a statistically significant difference ( t=8.172, P<0.001). After 48, 72 and 96 hours of ovarian cancer Hey cells being transfected with MALAT1 overexpression plasmid, the absorbance ( A) values of cells in the MALAT1 overexpression group were significantly greater than those in the control group (0.522±0.021 vs. 0.433±0.021; 0.644±0.012 vs. 0.544±0.051; 0.887±0.055 vs. 0.698±0.042), with statistically significant differences (all P<0.05). After MALAT1 being overexpressed in Hey cells, at 0.10 ng/μl concentration of 5-FU, the proliferation rate of cells in the overexpression group was significantly faster than that in the control group (0.615±0.036 vs. 0.506±0.042; t=4.432, P=0.002), and the cells at 1.00, 10.00, 100.00 ng/μl concentrations of 5-FU showed the same trends (all P<0.05). At 0.01 ng/μl concentration of cisplatin, the proliferation rate of cells in the overexpression group was significantly faster than that in the control group (0.777±0.015 vs. 0.733±0.039; t=2.355, P=0.023), and the cells at 0.10, 1.00, 10.00, 100.00 ng/μl concentrations of cisplatin showed the same trends (all P<0.05). After miR-142-3p being overexpressed in Hey cells, at 0.10 ng/μl concentration of 5-FU, the proliferation rate of cells in the overexpression group was significantly slower than that in the control group (0.512±0.051 vs. 0.744±0.119; t=4.028, P=0.004), and the cells at 1.00, 10.00, 100.00 ng/μl concentrations of 5-FU showed the same trends (all P<0.05). At 0.10 ng/μl concentration of cisplatin, the proliferation rate of cells in the overexpression group was significantly slower than that in the control group (0.520±0.043 vs. 0.674±0.096; t=3.441, P=0.009), and the cells at 1.00, 10.00, 100.00 ng/μl concentrations of cisplatin showed the same trends (all P<0.05). After ovarian cancer Hey cells being treated with 0.10, 1.00, 10.00, 100.00 ng/μl concentrations of 5-FU and cisplatin, the proliferation rates of cells in the MALAT1 overexpression group, MALAT1+ miR-142-3p group and control group showed statistically significant differences (all P<0.05). Further pairwise comparisons revealed that the proliferation rates of cells in the MALAT1+ miR-142-3p group were significantly slower than those in the MALAT1 overexpression group (all P<0.05). Conclusion:MALAT1 can reduce the sensitivity of ovarian cancer cells to 5-FU and cisplatin by targeted miR-142-3p, leading to chemotherapy resistance of ovarian cancer.