Background The renin-angiotensin-aldosterone system （RAAS） is important for the development of essential hypertension, and many antihypertensive drugs target it. This study was undertaken to determine whether polymo...Background The renin-angiotensin-aldosterone system （RAAS） is important for the development of essential hypertension, and many antihypertensive drugs target it. This study was undertaken to determine whether polymorphisms in the renin-angiotensin-aldosterone system are related to the blood pressure （BP） response to diuretic treatment in a Chinese Han ethnic population. Methods Fifty-four patients with essential hypertension received hydrochlorothiazide （12.5 mg, once daily） as monotherapy for four weeks. Seven polymorphisms in RAAS genes were genotyped by gene chip technology. The relationship between these polymorphisms and the change in blood pressure was observed after the 4-week treatment. Results The patients with angiotensinogen （AGT） -6G allele showed a greater reduction in diastolic BP （P=- 0.025） and mean BP （P=-0.039） than those carrying AA genotype. Patients carrying aldosterone synthase （CYP11B2） CC genotype exhibited a greater BP reduction than those carrying CT and TT genotypes （systolic BP： P=- 0.030; diastolic BP： P=- 0.026; mean BP： P=-0.003）. In addition, patients with a combination of CYP11B2 CC genotype and angiotensin converting enzyme （ACE） D allele might have a more pronounced reduction of systolic BP than those with any other genotypic combinations of the two genes （P=0.007）. Conclusions AGT-6G allele, CYP11B2 -344CC genotype and its combination with ACE D allele are associated with BP response to hydrochlorothiazide treatment. Larger studies are warranted to validate this finding.展开更多
The introduction of the antibiotics into clinical practice has significantly reduced the mortality of infectious diseases. Although chromosomally mediated β-1actamase is natural in many genera of bacteria, the intens...The introduction of the antibiotics into clinical practice has significantly reduced the mortality of infectious diseases. Although chromosomally mediated β-1actamase is natural in many genera of bacteria, the intensive use of antibiotics is the main cause for the increasing emergence of new β-1actamases. So far, more than 340 β-lactamases have been identified,1 among which, more than 200 are extended-spectrum β-lactamases （ESBLs）.2 The most prevalent β-lactamases are class A enzymes, including SHV and TEM. Genes encoding these enzymes generally located in large transferable plasmids. The dissemination of these plasmids attributes to the increasing incidence and spread of v-lactam resistance. It is important to investigate the prevalence and allelic distribution of genes encoding β-lactamase in the bacterial population in order to prevent the emergence of ESBLs in those bacteria and the spread of ESBLs in the clinical setting.展开更多
文摘Background The renin-angiotensin-aldosterone system （RAAS） is important for the development of essential hypertension, and many antihypertensive drugs target it. This study was undertaken to determine whether polymorphisms in the renin-angiotensin-aldosterone system are related to the blood pressure （BP） response to diuretic treatment in a Chinese Han ethnic population. Methods Fifty-four patients with essential hypertension received hydrochlorothiazide （12.5 mg, once daily） as monotherapy for four weeks. Seven polymorphisms in RAAS genes were genotyped by gene chip technology. The relationship between these polymorphisms and the change in blood pressure was observed after the 4-week treatment. Results The patients with angiotensinogen （AGT） -6G allele showed a greater reduction in diastolic BP （P=- 0.025） and mean BP （P=-0.039） than those carrying AA genotype. Patients carrying aldosterone synthase （CYP11B2） CC genotype exhibited a greater BP reduction than those carrying CT and TT genotypes （systolic BP： P=- 0.030; diastolic BP： P=- 0.026; mean BP： P=-0.003）. In addition, patients with a combination of CYP11B2 CC genotype and angiotensin converting enzyme （ACE） D allele might have a more pronounced reduction of systolic BP than those with any other genotypic combinations of the two genes （P=0.007）. Conclusions AGT-6G allele, CYP11B2 -344CC genotype and its combination with ACE D allele are associated with BP response to hydrochlorothiazide treatment. Larger studies are warranted to validate this finding.
文摘The introduction of the antibiotics into clinical practice has significantly reduced the mortality of infectious diseases. Although chromosomally mediated β-1actamase is natural in many genera of bacteria, the intensive use of antibiotics is the main cause for the increasing emergence of new β-1actamases. So far, more than 340 β-lactamases have been identified,1 among which, more than 200 are extended-spectrum β-lactamases （ESBLs）.2 The most prevalent β-lactamases are class A enzymes, including SHV and TEM. Genes encoding these enzymes generally located in large transferable plasmids. The dissemination of these plasmids attributes to the increasing incidence and spread of v-lactam resistance. It is important to investigate the prevalence and allelic distribution of genes encoding β-lactamase in the bacterial population in order to prevent the emergence of ESBLs in those bacteria and the spread of ESBLs in the clinical setting.
