Humoral immune response to human cytomegalovirus in patients undergoing percutaneous transluminal coronary angioplasty

Indirect-blocking ELISA for detecting antibodies against glycoprotein B (gB) of porcine cytomegalovirus (PCMV)

The major epitope region of the glycoprotein B (gB) gene of the porcine cytomegalovirus (PCMV), with a length of 270 bp, was cloned and expressed in Escherichia coli Rosetta (DE3). The major gB epitope was detected using an agar gel precipitation and Western blot analysis with the polyclonal antibodies specific for the major epitope. An indirect-blocking enzyme-linked immunosorbent assay (ELISA) was developed using the expressed major gB epitope as a coating antigen for the detection of PCMV antibodies. The results of the tests show that the indirect-blocking ELISA has 98% specificity and 97.8% sensitivity. No cross-reactions were observed between the major gB epitope and the antibodies against other virus, which indicates that the gB epitope is specific for PCMV antibodies. The indirect-blocking ELISA is a highly specific, sensitive method for detecting anti-PCMV gB antibodies.

Prevalence of Helicobacter pylori infection and its association with cardiovascular risk factors in Korean adults

OBJECTIVE

The purpose of this study is to evaluate the prevalence of Helicobacter pylori (H. pylori) infection and its association with cardiovascular risk factors in healthy Korean adults. In 58981 subjects who participated in health screening program, the proportion of seropositive subjects for H. pylori and its association with cardiovascular risk factors was evaluated.

RESULTS

A total of 70.9% of participants were tested positive for the H. pylori antibody. The seropositivity was highest in the age group of 50 and 60 years old. More male subjects tended to be infected with H. pylori (p<0.05) than female subjects except for the age group of 50s. H. pylori seropositive subjects tended to be older than seronegative subjects (41.5 vs. 39.2 years old). After adjusting for age, H. pylori-seropositive group showed higher mean values for total cholesterol, triglyceride, low-density lipoprotein (LDL)-cholesterol, apolipoprotein B and lower values for high-density lipoprotein (HDL)-cholesterol, apolipoprotein A1 (p<0.05). In univariate correlation analysis, age, total cholesterol, LDL-cholesterol and apolipoprotein B were positively correlated and HDL-cholesterol and apolipoprotein A1 were negatively correlated with H. pylori immunoglobulin G (IgG) titers (p<0.05). The multiple analysis of covariance analysis (MANCOVA) for the H. pylori infection status showed triglyceride, HDL-cholesterol and apolipoproteins associated with H. pylori infection significantly (p<0.05). In the analysis performed only in the H. pylori-seropositive group, no difference between the groups with and without peptic ulcer were shown according to the risk factors except HDL-cholesterol (p=0.031).

CONCLUSIONS

H. pylori infection is prevalent in Korean adults and is associated with cardiovascular risk factors, especially with triglyceride, HDL-cholesterol and apolipoproteins, independently from the presence of peptic ulcer. This is in line with the previous study results in which H. pylori infection per se might be one of the factors affecting atherosclerosis through modulation of lipid profiles, which needs further research.

Microorganisms in the aetiology of atherosclerosis

Recent publications have suggested that infective pathogens might play an important role in the pathogenesis of atherosclerosis. This review focuses on these microorganisms in the process of atherosclerosis. The results of in vitro studies, animal studies, tissue studies, and serological studies will be summarised, followed by an overall conclusion concerning the strength of the association of the microorganism with the pathogenesis of atherosclerosis. The role of the bacteria Chlamydia pneumoniae and Helicobacter pylori, and the viruses human immunodeficiency virus, coxsackie B virus, cytomegalovirus, Epstein-Barr virus, herpes simplex virus, and measles virus will be discussed.