Background Extended-spectrum β-lactamase （ESBL）-producing Klebsiella pneumoniae （K.pneumoniae） is one of the most popular pathogens that cause refractory respiratory tract infection.The genetic environment,includ...Background Extended-spectrum β-lactamase （ESBL）-producing Klebsiella pneumoniae （K.pneumoniae） is one of the most popular pathogens that cause refractory respiratory tract infection.The genetic environment,including insertion sequences and the types of promoter,plays a key role in exploration of the mechanism of prevalence and dismission of the ESBL-producing K.pneumoniae isolates.The aim of the investigation was to target analysis the genetic environment and promoter sequences of blaCTX-M,blaSHV and blaTEM,the most popular β-lactamase genes harbored by ESBL-producing K.pneumoniae isolates.Methods From February 2010 to July 2011,158 of 416 K.pneumoniae isolates producing ESBL from patients with lower respiratory tract infection were collected from seven tertiary hospitals from Beijing,Anhui,Fujian,Liaoning,Hebei and Inner Mongolia Autonomous Region in China.The genetic environment including promoters of 10 types of blaCTX-M,18 types of blaSHVand 2 types of blaTEM were analyzed by amplification and direct sequencing with various sets of PCR primers.Results ISEcp1 was located upstream of the 5＇ end of the blaCTX-M gene in 130 （97.0％） out of 134 K.pneumoniae isolates harboring blaCTX-M and provided a conserved promoter to blaCTX-M.A non-coding sequence preceded by kdpC and recF was identified in all of the blaSHV genes except blaSHV-12 and blaSHV-2a.IS26 was also found upstream of 1 blaCTX-M-15,10 blaSHV-1 strains,4 blaTEM-1 and all of the blaSHV-2,blaSHV-2a,blaSHV-5 and blaSHV-12.Eighty-seven of 91 strains harboring blaTEM-1 carried a copy of Tn2 and IS26-blaTEM-1 fragments were also detected in 4 strains.With respect to K.pneumoniae,the genetic environment of blaCTX-M-38,blaSHV-142 and blaTEM-135 were firstly elaborated,and four kinds of novel genetic environment of blaCTX-M-3,blaCTX-M-15 and blaTEM-1 have been detected as well.Conclusions Perfective implementation of the genetic environment information of β-lactamase gene needs to be further explored and supplemented.ISEcp1 and IS26 elements are widespread upstream of the blaCTX-M,blaSHV and blaTEM genes and contribute to horizontal transmission and genetic expression.展开更多
Fasudil, a selective rho kinase(ROCK) inhibitor, has been reported to play a beneficial role in systemic inflammation in acute lung injury, but its mechanism for ameliorating pulmonary edema and inflammation remains u...Fasudil, a selective rho kinase(ROCK) inhibitor, has been reported to play a beneficial role in systemic inflammation in acute lung injury, but its mechanism for ameliorating pulmonary edema and inflammation remains unclear. Using hematoxylin-and-eosin(H&E) staining, immunohistochemistry, enzyme-linked immunosorbent assay,quantitative real time PCR and Western blotting, we found that fasudil attenuated LPS-induced lung injury, decreased lung edema, and suppressed inflammatory responses including leukocyte infiltration and IL-6 production. Further,fasudil upregulated LPS-induced aquaporin 5 reduction and inhibited NF-κB activation in the lungs of mice. Our results suggest that fasudil could restore the expression of aquaporin 5 to eliminate LPS-induced lung edema and prevent LPS-induced pulmonary inflammation by blocking the inflammatory pathway. Collectively, blockade of the ROCK pathway by fasudil may be a potential strategy for the treatment of acute lung injury.展开更多
Diffuse pulmonary lymphangiomatosis （DPL） is a rare disease that is characterized by diffuse proliferation of abnormal pulmonary lymphatic channels. DPL occurs mostly in children and young adults and often undergoes...Diffuse pulmonary lymphangiomatosis （DPL） is a rare disease that is characterized by diffuse proliferation of abnormal pulmonary lymphatic channels. DPL occurs mostly in children and young adults and often undergoes a progressive clinical course, eventually causing deterioration of the lung. Both the clinical diagnosis and treatment of DPL remain a challenge. Here, we report a case of DPL in a 53-year-old Chinese woman with comprehensive investigations including pulmonary function tests, computer tomography （CT）, bronchoscopy and histological examination of the lung biopsy, and review the literature.展开更多
文摘Background Extended-spectrum β-lactamase （ESBL）-producing Klebsiella pneumoniae （K.pneumoniae） is one of the most popular pathogens that cause refractory respiratory tract infection.The genetic environment,including insertion sequences and the types of promoter,plays a key role in exploration of the mechanism of prevalence and dismission of the ESBL-producing K.pneumoniae isolates.The aim of the investigation was to target analysis the genetic environment and promoter sequences of blaCTX-M,blaSHV and blaTEM,the most popular β-lactamase genes harbored by ESBL-producing K.pneumoniae isolates.Methods From February 2010 to July 2011,158 of 416 K.pneumoniae isolates producing ESBL from patients with lower respiratory tract infection were collected from seven tertiary hospitals from Beijing,Anhui,Fujian,Liaoning,Hebei and Inner Mongolia Autonomous Region in China.The genetic environment including promoters of 10 types of blaCTX-M,18 types of blaSHVand 2 types of blaTEM were analyzed by amplification and direct sequencing with various sets of PCR primers.Results ISEcp1 was located upstream of the 5＇ end of the blaCTX-M gene in 130 （97.0％） out of 134 K.pneumoniae isolates harboring blaCTX-M and provided a conserved promoter to blaCTX-M.A non-coding sequence preceded by kdpC and recF was identified in all of the blaSHV genes except blaSHV-12 and blaSHV-2a.IS26 was also found upstream of 1 blaCTX-M-15,10 blaSHV-1 strains,4 blaTEM-1 and all of the blaSHV-2,blaSHV-2a,blaSHV-5 and blaSHV-12.Eighty-seven of 91 strains harboring blaTEM-1 carried a copy of Tn2 and IS26-blaTEM-1 fragments were also detected in 4 strains.With respect to K.pneumoniae,the genetic environment of blaCTX-M-38,blaSHV-142 and blaTEM-135 were firstly elaborated,and four kinds of novel genetic environment of blaCTX-M-3,blaCTX-M-15 and blaTEM-1 have been detected as well.Conclusions Perfective implementation of the genetic environment information of β-lactamase gene needs to be further explored and supplemented.ISEcp1 and IS26 elements are widespread upstream of the blaCTX-M,blaSHV and blaTEM genes and contribute to horizontal transmission and genetic expression.
基金supported by the National Natural Science Foundation of China (No. 81273571)Jiangsu Clinical Research Center for Respiratory Diseases Project under grant No.BL2012012a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) (No.JX10231802)
文摘Fasudil, a selective rho kinase(ROCK) inhibitor, has been reported to play a beneficial role in systemic inflammation in acute lung injury, but its mechanism for ameliorating pulmonary edema and inflammation remains unclear. Using hematoxylin-and-eosin(H&E) staining, immunohistochemistry, enzyme-linked immunosorbent assay,quantitative real time PCR and Western blotting, we found that fasudil attenuated LPS-induced lung injury, decreased lung edema, and suppressed inflammatory responses including leukocyte infiltration and IL-6 production. Further,fasudil upregulated LPS-induced aquaporin 5 reduction and inhibited NF-κB activation in the lungs of mice. Our results suggest that fasudil could restore the expression of aquaporin 5 to eliminate LPS-induced lung edema and prevent LPS-induced pulmonary inflammation by blocking the inflammatory pathway. Collectively, blockade of the ROCK pathway by fasudil may be a potential strategy for the treatment of acute lung injury.
文摘Diffuse pulmonary lymphangiomatosis （DPL） is a rare disease that is characterized by diffuse proliferation of abnormal pulmonary lymphatic channels. DPL occurs mostly in children and young adults and often undergoes a progressive clinical course, eventually causing deterioration of the lung. Both the clinical diagnosis and treatment of DPL remain a challenge. Here, we report a case of DPL in a 53-year-old Chinese woman with comprehensive investigations including pulmonary function tests, computer tomography （CT）, bronchoscopy and histological examination of the lung biopsy, and review the literature.
