Experiments were carried on cultured neonatal myocardial cells of rat to study the effects of angiotensin Ⅰ(AngⅠ) and Ⅱ (AngⅡ) on the synthesis of DNA, RNA, protein and on the cardiac hypertrophy. It was shown that the incorporation of both ~3H-TdR and ~(14)C-uR increased over a set of time periods after addition of AngⅠ and AngⅡ to the medium. The mean protein content of the single myocardial cell was also enhanced, and the volume of myocardial cell was increased significantly after a continuous stimulation of AngⅠ and AngⅡ for 7 days. No stimulation effect was observed either in the synthesis of DNA, RNA, and protein or in the volume of myocardial cells after addition of AngⅠ together with the angiotensin converting enzyme inhibitor(ACEI, captopril). These results indicated that: (1). AngⅠ acts as a regulator by its indirect stimulation effect on the synthesis of DNA, RNA and protein of myocardial cells, since it must be changed into AngⅡ by the ACE present in myocardial cells. The ACE can be inhibited by the ACEI: (2) The hypertrophy of cultured neonatal myocardial cells may induced by a continuous stimulation of AngⅠ and AngⅡ.

Environmental Exposure ; adverse effects ; Hearing Loss ; etiology ; Humans ; Noise, Occupational ; adverse effects ; Occupational Diseases ; etiology ; Occupational Exposure ; adverse effects ; Risk Factors ; Smoking ; adverse effects ; Vibration ; adverse effects

Angiotensin III ; Humans

Cytokines ; metabolism ; Humans ; Leukocytes, Mononuclear ; immunology ; secretion ; Ubiquitin ; blood

OBJECTIVE To investigate the status of nosocomial infection in community health services and offer a scientific basis for nosocomial infection control.METHODS Totally 5738 outpatients were investigated retrospectively for nosocomial infection in community.RESULTS The most frequently nosocomial infection sites were lower respiratory tract,and next upper respiratory tract and urinary tract(2131,1045 and 934,respectively).The major reasons of causing the nosocomial infection were irrational usage of antibacterial drugs(39.0%),invasive procedures(31.0%) and using glucocorticoids(10.0%).Most of the pathogenic bacteria of the nosocomial infection were Gram-negative and the next were Gram-positive and fungi.74.4% of the pathogens were resistant to most of antibioties.CONCLUSIONS Alzeimer′s disease patients in the community health centers are popular and susceptible to infection.

Objective To evaluate the dynamic contrast-enhanced magnetic resonance angiography(DCE MRA)value of definitive diagnosis and typing as well as its roles to clinical management with aortic dissection(AD).Methods 20 patients with different types aortic dissection were examined using DCE MRA and proved by operation.Results The reliable MRA image was obtained in all the 20 cases.The MRA typical appearences were the true and false lumen of AD.The entrance and exit site,true and false channel,and intimal flap can be demonstrated on DCE MRA image.Conclusion DCE MRA is an accurate,quick,non-invasive medical imaging technique and can serve as an initial imaging modality for AD diagnosis.

[Objective]To study the effect of femoral offset and hip joint center on joint function after total hip replacement,radiographic measurements were taken postoperation.[Method]A series of 92 hip joints(87 patients)were followed up.The average follow up priod was 25 monthes.The femoral offset and the position of the prothesis head center were measured in the orthophoric hip joint X-ray photograph and were compared with anatomic Fo and HJC.H arris evaluation system was used to evaluate joint function in four groups.The results were statistically analyzed,with Fisher' exact probability and P value less than 0.05 indicating significant difference.[Result]The coincidence rate of group A(both FO and HJC,27 hips)was 29.35%,group B(only Fo,23 hips)25.00%,group C(only HJC,31 hips)33.70%,group D(neither FO nor HJC,11 hips)11.96%.93.0% patients got the Harris score more than 80 for group A,73.19%(group B),74.19%(group C),27.27%(group D).The difference of Harris evaluation between A and B,A and C,A and D was significant statistically.[Conclusion]Based on the results of the study,the recovery of femoral offset and hip joint center should be considered to contribute to the healing effect after total hip replacement directly.

Objective To investigate the effect of sodium arsenite combined with cigarette smoke solution on NF-?B in rat lymphocytes. Methods Rat lymphocytes were divided into 4 groups: the arsenite treatment group, the CSS treatment group, the arsenite and CSS treatment group, and the control group. Electrophoretic mobility shift assays was used to detect levels of NF-?B DNA binding. Western blot was used to detect protein expression of I?B?. Results Levels of NF-?B DNA binding in the CSS treatment group and the arsenite treatment group were significantly increased (P

Objective To observe the effects of sodium arsenite (NaAsO2) on the expression of transcription factor nrf2 (Nrf2) and heme oxygenase 1 (HO-1) in Chang liver cells, and to explore the possible mechanism by using buthionine sulfoximine ( BSO), a GSH synthesis inhibitor. Methods Chang liver cells were treated with NaAsO2 at the doses of 5, 10 and 20 ?mol/L, alone, for 24 h, or pretreated with BSO (3 mmol/L, 12 h). Western blot assays were used to detect the protein expression of Nrf2 and HO-1. Results The protein expression of Nrf2 and HO-1 significantly increased in 5, 10 and 20 ?mol/L of NaAsO2 alone groups, and Nrf2 and HO-1 protein expression was up-regulated even higher by BSO pretreatment (P

Objective To study the effects of sodium arsenite on the mRNA expression of GTP cyclohydrolase (GTPCH) and 6-pyruvoyl-tetrahydropterin synthase (PTPS) in Chang liver cells. Methods Human Chang liver cells were cultured with sodium arsenite at doses of 0, 50, 200 and 400 ?mol/L for 12 hours. Cell viability was tested by MTT assay, and the expression of mRNA of GTPCH and PTPS was detected by RT-PCR. Results Cell viability in 50 ?mol/L group was almost the same as that in control, while the viability in the other two groups were significantly lower than that in control. All of the mRNA expression levels in the three groups were significantly lower than that in control with dose-dependent manner. Conclusion The down-regulated expression of GTPCH and PTPS, the main enzymes of the synthesis of BH4, induced by sodium arsenite exposure may be related with arsenic related skin depigmentation.