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<p><b>OBJECTIVE</b>To investigate the mechanism of miR-133a in reversing neonatal rat cardiomyocyte hypertrophy induced by phenylephrine.</p><p><b>METHODS</b>A miR-133a precursor cDNA was used to construct an adenovirus vector, which was transfected into 293 cells to harvest miR-133a-containing virus. Neonatal rat cardiac myocytes treated by phenylephrine were exposed to miR-133a adenovirus, and the changes in cell area was measured; the expression levels of miR-133a and Acta1, Actc1, Actb, Myh6, Myh7, and BNP mRNAs were detected by quantitative RT-PCR.</p><p><b>RESULTS</b>Phenylephrine treatment increased the area of cardiomyocytes by more than 3 folds and significantly enhanced the expression levels of Acta1, Actc1, Actb, Myh6, Myh7 and BNP mRNAs. All these changes were obviously reverse by miR-133a treatment.</p><p><b>CONCLUSION</b>miR-133a is an important regulator of phenylephrine-induced cardiomyocyte hypertrophy and negatively regulates this process.</p>
Asunto(s)
Animales , Ratas , Adenoviridae , Células Cultivadas , Vectores Genéticos , Hipertrofia , MicroARNs , Genética , Miocitos Cardíacos , Biología Celular , Patología , Fenilefrina , ARN Mensajero , TransfecciónRESUMEN
OBJECTIVE Through detecting to drug susceptibility results of 12 commonly used antibiotics in Pseudomonas aeruginosa (PAE),we provide the scientific basis for the prevention of infection and reasonable choice of antibiotics. METHODS Twelve antibiotics′ susceptibility tests in vitro were carried out in PAE isolated from lower respiratory tract in Renming Hospital,Wuhan University from Jan 2007 to Dec 2008. RESULTS In the anti-infective drugs,the resistance rate to ceftazidime was the lowest (36.8%),followed by amikacin (39.6%),piperacillin/tazobactam (43.8%),cefepime (47.8%) and cefoperazone/sulbactam (48.5%).The resistant status of PAE was serious and multi-drug resistance existed. CONCLUSIONS The lower respiratory tract infection caused by PAE which possesses single and multiple drug-resistance. We should more think of it and strengthen preventive measures to reduce the rate of infection. Reasonably prudent use of antibiotics is still the best way of delaying its rapid increase of drug-resistance strains.
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OBJECTIVE To investigate the distribution and characteristics of drug-resistance of Staphylococcus aureus (SAU) causing lower respiratory infection, for rational using of antibiotics in clinical practice. METHODS A retrospective analysis on S. aureus isolates and their drug-resistance characteristics were carried out. These strains were isolated from lower respiratory specimens in clinical laboratory of Renmin Hospital of Wuhan University from Jan 2007 to Dec 2007. RESULTS Among 94 strains, 69 were meticillin-resistant S. aureus(MRSA), accounting for 73.40%. All MRSA strains were resistant to penicillin G, while sensitive to vancomycin and teicoplanin. Resistant rate to chloramphenicol was 7.24 %. The average resistance rate of MRSA to quinolones, macrolides and aminoglycosides were relatively high (56.52-98.55%). And resistant rate of MRSA was higher than the meticillin-sensitive S. aureus (MSSA) in average level. CONCLUSIONS Hospitals at all levels are proposed to strengthen drug resistance supervising so as to prevent the infection breaks.
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OBJECTIVE To study the distribution and drug resistance of nosocomial infection pathogens isolated from of lower respiratory tract in senile patients and preventive control measures.METHODS The sputum and lower respiratory tract secretion of 594 senile patients were cultured to detect pathogens which were confirmed by routine methods.Disk diffusion test was used to analyze drug resistance.RESULTS Pseudomonas aeruginosa was the top one(21.2%).The drug resistance of Gram-negative organisms were the highest.Extensive-spectrum beta-lactamase(ESBLs) were tested out with 38.2% occurrence.CONCLUSIONS Strictly control in every step of procedures could reduce nosocomial infection.