OBJECTIVE: To study the effect of MDR1 (P-gp) and ABCG2 on the drug resistance in Hep 2 cells. METHOD: Flow cytometry was used to detect the variations of the antitumor drugs accumulation and discharging, and activity variations when MDR1 and ABCG2 inhibitors were used in Hep-2. RESULT: The accumulation and discharging of mitoxantrone was significantly higher than the control group when ABCG2 inhibitor FTC was used in Hep-2 (P<0. 05). In contrast, P-gp did not appear similar case; To the mitoxantrone and cisplatin, there was no statistical correlation about activity of Hep-2 between P-gp or ABCG2 antagonist and the control; To the doxorubicin, combining FTC and P-gp, the activity of Hep-2 was higher than the control and difference was significant (P<. 05), In contrast, FTC and P-gp did not appear similar case when used alone; To the 5-FU, when PGP used, the activity of Hep-2 was higher than that in the control and difference was significant (P<0. 05), In con- trast, FTC and FTC+P-gp did not appear similar case; To the paclitaxel, when P-gp or FTC+P-gp used, the activity of Hep-2 was higher than that in the control and difference was significant(P<0. 05). CONCLUSION ABCG2 may lead to drug resistance mainly by changing the ability of cell in accumulating and discharging chemotherapy drugs. P-gp has other way. P-gp and ABCG2 play different roles in different drug resistance.
ATP Binding Cassette Transporter, Subfamily B ; metabolism ; ATP Binding Cassette Transporter, Subfamily G, Member 2 ; ATP-Binding Cassette Transporters ; metabolism ; Cell Line, Tumor ; Cisplatin ; pharmacology ; Doxorubicin ; pharmacology ; Drug Resistance, Neoplasm ; Humans ; Mitoxantrone ; pharmacology ; Neoplasm Proteins ; metabolism ; Paclitaxel ; pharmacology

ObjectiveTo explore the clinical significance of fms-like tyrosine kinase3(FLT3) expression in evaluation prognosis of acute myeloid leukemia(AML) prognosis.Methods50 patients with AML were selected.AML patients with normal karyotype were 20 cases,the abnormal karyotype were 30 cases.3ml bone marrow before themotherapy was aspirated respectively,and the FLT3 gene expression in leukemia cells was detected with polyenzyme chain react(PCR).ResultsThe FLT3 expression rate in AML patients with normal karyotype was 5.0％,and was 26.7％ in AML patients with abnormal karyotype,33.3％ in AML patients with refractory-relapse,and 4.5％ in AML patients with continue remission.The FLT3 expression rate was related with high leukemia cells percentage in bone marrow and high blood cells count in peripheral blood,and was not related with Franch America British(FAB) classification.The free-disease survival(FDS) and overall survived(OS) was shorter in FLT3 expression AML patients than that in no FLT3 expression AML patients.There was a statistical significance between the former and the latter( x2 =4.17,P ＜0.05 ).Conclusion FLT3 was a kind of worse factor in AML patients prognosis,and could guide clinical individual treatment in AML.

Objective To evaluate the clinical application value of reflectance confocal microscopy(RCM) in the diagnosis of several common diseases manifesting as papules in children, including lichen nitidus, verruca planae, lichen striatus, milium, molluscum contagiosum and lichen pilaris. Methods A total of 579 children clinically characterized by papules were recruited into this study. RCM was used to observe lesions and perilesional normal skin. The RCM features of 6 diseases manifesting as papules were analyzed and compared. Results Based on RCM images, 236 patients were diagnosed with lichen nitidus, 70 with verruca planae, 123 with lichen striatus, 40 with milium, 53 with molluscum contagiosum and 57 with lichen pilaris. All the 6 diseases had typical RCM features. Concretely speaking, RCM images of lichen nitidus lesions showed infiltration of dense inflammatory cells and melanophages in enlarged dermal papillae. In RCM images of verruca planae lesions, cells in the granular and spinous layers were arranged in concentric circles, giving a rose cluster?like appearance. RCM images of lichen striatus lesions revealed focal swelling of stratum spinosum, absent or local liquifaction degeneration of basal cells, and clustering of a moderate number of inflammatory cells in the superficial dermis. In RCM images of milium lesions, well?circumscribed round or oval structures containing highly but nonuniformly refractive materials could be seen in the dermis. RCM images of molluscum contagiosum lesions showed intact cystoid structures containing highly refractive molluscum bodies. Lowly to moderately refractive cutin ? like materials were observed along with the dilation of hair follicle infundibula in RCM images of lichen pilaris lesions. In RCM images, the 6 diseases were distinguished mainly based on structural features(patterns and refractivity)of skin lesions shown by continuous vertical scanning. Conclusion RCM is of great value to the diagnosis of diseases manifesting as papules in children.

To clone and express the gene encoding chicken aminopeptidase N (chAPN), and analysis the biological function of chAPN expressed in Escherichia coli (E. coli). The chAPN gene was amplified by RT-PCR from the kidney cells of chicken embryo and then cloned into the prokaryotic expression vector pCOLD-TF. Recombinant expression plasmid of pCOLD-TF-chAPN was constructed and then transformed into the competent E. coli BL21(DE3) cells for expression under different conditions such as induction time and inductor concentrations. Purified soluble recombinant chAPN was obtained by Ni-NTA His Bind Resin affinity chromatography and identified by SDS-PAGE gel and Western blotting assay. Its biological function was detected by its reaction with Leu-PNA and Enzyme-Linked Immunosorbent Assay (ELISA). The results showed that the expression product of chAPN gene in E. coli was soluble. It was able to bind infectious bronchitis virus (IBV) dose-dependently. In conclusion, chAPN gene has been successfully cloned and expressed in E. coli, which will establish a basis for further research the enzymatic activity and antiviral function.
Animals ; CD13 Antigens ; biosynthesis ; genetics ; metabolism ; Chickens ; Cloning, Molecular ; Escherichia coli ; genetics ; metabolism ; Recombinant Proteins ; biosynthesis ; genetics ; metabolism

Objective To investigate the expression of Scinderin(SCIN myoprotein) in breast cancer tissues and adjacent tissues,and to explore the relationship between the expression of Scinderin and different molecular subtypes of breast cancer as well as the clinical factors.Methods Immunohistochemical staining method was used to detect the expression of SCIN in 120 cases of breast carcinoma and 30 adjacent tissues.The relation between SCIN expression in breast cancer tissue and molecular subtypes,pathologic stage,age,tumor size,lymph node metastasis was analyzed.Results SCIN expression level in breast cancer tissue was lower than in the tissues adjacent to carcinoma (6.06±3.32 vs 7.77±3.32,P＜0.05).SCIN expression was associated with breast cancer molecular subtypes (P＜0.05),and it was irrelevant with age,tumor size,histological grade,lymph node metastasis,or clinical stage (P＞0.05).Conclusions The expression of SCIN in breast cancer tissues was lower than in the adjacent tissues.It is associated with breast cancer molecular subtypes.SCIN could become the protein markers of breast cancer molecular targeted therapy.

Objective:To explore the role of systematic wound management in the treatment of Stevens-Johnson syndrome (SJS) /toxic epidermal necrolysis (TEN) in children.Methods:Clinical data were collected from 5 children with SJS/TEN, who were admitted to the Department of Dermatology, Tianjin Children′s Hospital from October 2019 to August 2021, and retrospectively analyzed to investigate the role of systematic management of the skin and mucosa wound besides drug therapy in the treatment of SJS/TEN.Results:The 5 patients, including 1 case of SJS, 1 case of SJS/TEN overlap syndrome, and 3 cases of TEN, were aged 2 to 13 years, and were cured and discharged after the treatment with intravenous methylprednisolone and systematic wound management. Among the 5 children, the severity of TEN scores (STENS) were 18.6 ± 1.9 points at admission, and 13.8 ± 1.9, 4.4 ± 0.5, and 2.0 ± 0.7 points on days 7, 10, and 14 during hospitalization, respectively; the time to complete re-epithelialization was 10.0 ± 2.1 days, and the length of hospital stay was 14.4 ± 4.2 days. During 4-month multidisciplinary follow-up, no scars or complications of the eyes, mouth, genitalia, or lungs occurred.Conclusion:Systematic wound management is helpful to control the progress of SJS/TEN, accelerate wound healing, and improve patients′ quality of life.

Objective: To understand knowledge of comprehensive sexuality education and its associated factors among junior high school teachers in six provinces in China, in order to provide a scientific basis for teacher training. Methods: From June to December 2021, a convenience sampling method was used to select 1 016 junior high school teachers from Beijing, Chongqing, Liaoning, Sichuan, Yunnan and Guangdong provinces. A structured questionnaire was used to investigate teachers knowledge of comprehenswe sexuality education. Binary Logistic regression was used to analyze the related influencing factors of the knowledge of comprehensive sexuality education among junior high school teachers. Results: The study showed that the knowledge rate of comprehensive sexuality education among middle school teachers was 58.1%, and the knowledge rate was higher in teachers who had conducted sexuality education to students( χ 2=9.42, P <0.01). The percentage of the correct answer on the prevention and control of sexually transmitted diseases(26.0%), the impact of inequality on love relationships( 33.6 %), and the impact of mass media on sexual cognition(68.8%) was the lowest. Regardless of whether they had implemented sexuality education for students, the knowledge and awareness rate of sexual knowledge among biology teachers, school doctors/health teachers and mental health teachers was higher( OR=2.32, 4.17, P <0.05). Conclusion Knowledge of comprehensive sexuality education among middle school teachers still needs to be improved. It is advisable to strengthen the training of comprehensive sexuality education for middle school teachers and focus on teachers of subjects related to comprehensive sexuality education.

Objective:To evaluate the clinical efficacy and safety of adalimumab combined with acitretin in the treatment of childhood generalized pustular psoriasis.Methods:Five children with generalized pustular psoriasis were collected from Department of Dermatology, Tianjin Children′s Hospital from October 2019 to August 2020. After admission, the patients received oral acitretin at a dose of 0.5 mg·kg -1·d -1. After relevant laboratory examinations, these patients additionally received subcutaneous injections of 20- or 40-mg adalimumab at weeks 0 (the initial dose) , 1, and every 2 weeks thereafter; when patients obtained a 50% improvement in the Japanese Dermatology Association (JDA) severity index score, the dose of acitretin would be reduced to 0.3 mg·kg -1·d -1, and acitretin would be discontinued after a 75% improvement. The disease condition was evaluated at weeks 0, 1, 2, 4, 8, 12 and 24 after the start of adalimumab treatment, and adverse reactions were monitored during treatment. Results:All the 5 patients received drug treatment for at least 40 weeks. After 2-week treatment, 3 patients achieved a 50% reduction in JDA severity index score (JDA50) ; after 4-week treatment, 4 achieved JDA75, and 1 achieved JDA100; after 8-week treatment, all the 5 patients achieved JDA100. By June 2021, all the 5 children received follow-up for at least 40 weeks, no recurrence was observed during the treatment period, and no infections, malignant tumors or other serious adverse reactions occurred.Conclusion:Adalimumab combined with acitretin shows rapid onset of action and high safety in the treatment of childhood generalized pustular psoriasis.

Objective: To explore the relationship between depressive symptoms, negative life events and resilience among primary and secondary school teachers, so as to provide a reference for mental health promotion in school teachers. Methods: During November to December 2022, a questionnaire survey was conducted using convenient cluster sampling method to select 11 332 in service teachers from 38 schools in 8 provinces (cities) including Beijing, Guangdong, Anhui, Hubei, Sichuan, Xinjiang, Liaoning, and Heilongjiang. The Patient Health Questionnaire-9 items, a self developed 21-item Adverse Life Events questionnaire, and a 10-item Conner-Davidson Resilience Scale were used to assess depressive symptoms, experiences of negative life events, and resilience levels of the teachers, respectively. The relationship between depressive symptoms, negative life events and psychological resilience were analyzed by multiple linear regression and stratified regression. Results: The detection rate of depressive symptoms among primary and secondary school teachers was 14.0%. Negative life events of primary and secondary school teachers were positively correlated with depressive symptoms ( r =0.35), while psychological resilience was negatively correlated with depressive symptoms ( r =-0.45) ( P <0.05). After adjusting for possible covariates including gender and marital status, negative life events were positively correlated with depressive symptoms ( β=0.22, P <0.01). Resilience played a moderating role in the association of negative life events with depressive symptoms among primary and secondary school teachers ( B=-0.15, P <0.01). Conclusions Negative life events experiences are associated with higher level of depressive symptoms among school teachers. However, resilience might mitigate the negative effects of negative life events on depressive symptoms, playing a protective role in teachers mental health.

To study the distribution pattern of drug dust in the antibiotic raw material drug powder screening workshop and improve the working environment, we used COMSOL Multiphysics 6.0 software to simulate and study the airflow distribution and dust transport law in the powder screening workshop. The results indicated that the dust in the powder screening workshop diffused rapidly with the airflow and reached a stable state at the 100th second. After the dust migrated to a stable state, the area with excessive dust concentration (dust concentration>6 mg/m 3) widely distributed, mainly distributed in the middle and lower parts of the wall opposite the air inlet from the rotary vibrating screen. The distribution of dust showed a characteristic of local aggregation, and dust transport was related to airflow movement, which was prone to aggregation in areas with low airflow velocity and eddy currents. On the plane of the human respiratory belt height (h=1.5 m), the concentration near the dust producing surface was high, with local concentrations exceeding 32 mg/m 3. It was the key area for dust prevention and control. And the working environment can be improved by changing the air flow distribution in the workshop or other dust reduction methods.