Aim To investigate the effect of rapamycin on proliferation, migration, and invasion of squamous cell carcinoma A431 cells in vitro. Methods Human squamous cell carcinoma A431 cells were cultured in vitro. MTT assay was used to investigate proliferation of A431 cells treated by rapamycin at different concentra-tions of (5,10,20 nmol·L-1). Wound healing and transwell assay were performed to detect migration and invasion of A431 cells treated by rapamycin, respec-tively. Reverse transcription PCR ( RT-PCR ) and Western blot were used to determine the expression of the osteopontin ( OPN ) in A431 cells at mRNA level and protein level, respectively. Results Rapamycin significantly increased the inhibitory rates of prolifera-tion and inhibited the migration and invasion of A431 cells in vitro. Furthermore, rapamycin treatment re-duced the expression of OPN in A431 cells. Conclu-sions Rapamycin can inhibit the migration and inva-sion of A431 . The intrinsic mechanism of rapamycin might be related to the down-regulation of the OPN ex-pression.

Objective To study indole alkaloids of Ervatamia hainanensis. Methods The compounds were separated and purified by column chromatography with silica gel and Sephadex LH-20. The structures were identified by IR, MS, and NMR. Results Seven alkaloids were identified as: hainanervatasine (Ⅰ), hainanervatacine (Ⅱ), vobasine (Ⅲ), coronaridine (Ⅳ), 3-hydroxyl coronaridine (Ⅴ), 3-(2-oxopropyl) coronaridine (Ⅵ), and tabernamine (Ⅶ), respectively. Conclusion Compounds Ⅰ and Ⅱ are new compounds. Compounds Ⅳ and Ⅵ are isolated from this plant for the first time.

OBJECTIVE:To explore the effects of entecavir combined with chemotherapy on positive HBV in tumor patients with normal liver function. METHODS:106 patients were selected and divided into observation group (44 cases) and control group (62 cases) according to therapy plan. Control group received routine chemotherapy according to tumor condition;observa-tion group was given Entecavir tablets orally 0.5 mg,qd,before 1 week of chemotherapy,for consecutive 1 week. HBV reactiva-tion rate,recurrence rate of severe hepatitis,mortality rate,serum level of ALT before and after treatment and the incidence of ADR were compared between 2 groups. RESULTS:4 patients of observation group and 2 of control group withdrew from the study. HBV reactivation rate,recurrence rate of severe hepatitis and mortality were 7.5%,0,0 in observation group and 56.7%, 50.0%,13.3% in control group,with statistical significance between 2 groups(P<0.05). Before chemotherapy,there was no sta-tistical significance in serum levels of ALT between 2 groups(P>0.05);after chemotherapy,the serum levels of ALT in 2 groups were increased significantly,and the control group was significantly higher than the observation group,with statistical significance (P<0.05). There was no statistical significance in the incidence of ADR between 2 groups(P>0.05). CONCLUSIONS:Entecavir can effectively prevent HBV reactivation and decrease the recurrence rate of severe hepatitis and mortality rate in tumor patients dur-ing chemotherapy, and doesn’t increase the risk of ADR.

Objective To analyze the dose of radiation to medical staff during 125I seeds loading Methods The radiation dose at different distances was measured by using thermoluminescence dosimeters (TLD),and the safe range for medical person was calculated.The doses and annual accumualive doses to the medical staff were estimated.Results The dose attenuation rates were 77.61％,98.04％,98.79％,99.30％,99.71％ and 100％ at distance of 10,20,30,40,50 and 100 cm from seeds tank,respectively.The dose to fingertips,chest,lens and thyroid of doctor were 51.08,35.50,34.73 and 33.78 μGy,and the annual dose reached 12.77,8.88,8.68 and 8.45 mGy when the number of annual operations was 250.The attenuation rate was 79.60％ and 28.36％ of inside and outside lead glass,respectively.Conclusions The radiation is undetectable at 100 cm away from seeds tank in the process of loading of 125I seeds,and lead glass is necessary for radiation protection.

As a non-physiological way of ventilation, mechanical ventilation has a great effect on the respiratory mechanics. The biggest problem of artificial airway is that it brings extra airway resistance to the respiratory tract. For different parts of the lung, positive pressure ventilation could cause different mechanic states. We can find the formation and influencing factors of transpulmonary pressure, transchest wall pressure, trans-lung-chest pressure, trans-diaphragmatic pressure, trans-pulmonary-diaphragmatic pressure, intrapleural pressure, plateau pressure and driving pressure, by analyzing the mechanic state in a unit area of the chest or diaphragm position in the way of basic mechanics. It is obviously different in the pulmonary pressure gradient caused by inspiratory driving between in spontaneous breathing and in mechanical ventilation. The pressure is transmitted from the periphery to the center in spontaneous breathing in physiological state, playing a traction role for lung tissue. The pressure is transmitted from the center to the periphery in positive pressure ventilation without spontaneous breathing, playing a pushing role for lung tissue. It can be divided into two stages in positive pressure ventilation with spontaneous breathing. The first stage is from inspiratory trigger effort to trigger sensitivity. It is similar to spontaneous inspiration in physiological state. The pressure gradient in this stage is from the peripheral to center. But the period is very short. The second stage is the positive pressure ventilation progress after the trigger sensitivity. The pressure gradient is caused by the pulling of the patient's spontaneous inhalation and the pushing of the positive pressure ventilation of the ventilator. There is a certain complementarity in the distribution and transmission of pressure, especially for non-physiological positive pressure ventilation. Therefore, through these basic mechanical analysis, clinical medical staff can better understand the impact of mechanical ventilation on respiratory mechanics.

Humans ; COVID-19 Vaccines/therapeutic use* ; HIV-1 ; Immunity, Humoral ; COVID-19/prevention & control* ; SARS-CoV-2

Objective : To investigate lim domain protein 4 (LMO4) functions and mechanisms in regulating proliferation of skin squamous cells (A431) , the shRNAs targeted to human LMO4 were coated by calcium phosphate nanoparticles (NP) and transfected into A431 cells to inhibit LMO4 expression. Methods : Reverse transcription and quantitative polymerase chain reaction ( RT⁃qPCR) , immunohistochemistry analysis and Western blot were used to detect expression of the interest genes. The expression vectors with shRNA targeted to human LMO4 (NP/sh⁃L) were coated by the calcium phosphate nanoparticles , and transfected into A431 . The MTT assay was conducted to determine cell proliferation after transfected for 24 , 36 and 48 h. Cells were stained with propidium iodide and examined cell cycles by using flow cytometry. Results : LMO4 expressed at higher levels both in the skin squacalcium phosphate nanoparticles and DNA was 10 ∶ 1 . There was no significant difference of transfection efficiency between the NP/sh⁃L and lipofection approaches. The MTT assay showed that silencing LMO4 inhibited proliferadown did not alter expression of CDK4 and cyclin D1 . Conclusion The calcium phosphate nanoparticles could bind and transfer the foreign DNA into the targeted cells with high efficiency. Silencing LMO4 decreased expression of cyclin E and CDK2 resulted in inhibition of cell proliferation.