Salivary IgA to MAA-LDL and Oral Pathogens Are Linked to Coronary Disease

A large body of literature has established the link between periodontal disease and cardiovascular disease. Oxidized low-density lipoproteins (OxLDLs) have a crucial role in atherosclerosis progression through initiation of immunological response. Monoclonal IgM antibodies to malondialdehyde-modified low-density lipoprotein (MDA-LDL) and to malondialdehyde acetaldehyde-modified low-density lipoprotein (MAA-LDL) have been shown to cross-react with the key virulence factors of periodontal pathogens Porphyromonas gingivalis and Aggregatibacter actinomycetemcomitans. We have previously shown that salivary IgA antibodies to MAA-LDL cross-react with P. gingivalis in healthy humans. In this study, we aim to assess whether oral mucosal immune response represented by salivary IgA to MAA-LDL and oral pathogens is associated with coronary artery disease (CAD). Also, the molecular mimicry through antibody cross-reaction between salivary IgA to MAA-LDL and oral pathogens was evaluated. The study subjects consisted of 451 patients who underwent a coronary angiography with no CAD ( n = 133), stable CAD ( n = 169), and acute coronary syndrome (ACS, n = 149). Elevated salivary IgA antibody levels to MAA-LDL, Rgp44 (gingipain A hemagglutinin domain of P. gingivalis), and Aa-HSP60 (heat shock protein 60 of A. actinomycetemcomitans) were discovered in stable-CAD and ACS patients when compared to no-CAD patients. In a multinomial regression model adjusted for known cardiovascular risk factors, stable CAD and ACS were associated with IgA to MAA-LDL ( P = 0.016, P = 0.043), Rgp44 ( P = 0.012, P = 0.004), Aa-HSP60 ( P = 0.032, P = 0.030), Tannerella forsythia ( P = 0.002, P = 0.004), Porphyromonas endodontalis ( P = 0.016, P = 0.020), Prevotella intermedia ( P = 0.038, P = 0.005), and with total IgA antibody concentration ( P = 0.002, P = 0.016). Salivary IgA to MAA-LDL showed cross-reactivity with the oral pathogens tested in the study patients. The study highlights an association between salivary IgA to MAA-LDL and atherosclerosis. However, whether salivary IgA to MAA-LDL and the related oral humoral responses play a causal role in the development in the CAD should be elucidated in the future.

Characterization of a natural mouse monoclonal antibody recognizing epitopes shared by oxidized low-density lipoprotein and chaperonin 60 of Aggregatibacter actinomycetemcomitans

Natural antibodies are predominantly antibodies of the IgM isotype present in the circulation of all vertebrates that have not been previously exposed to exogenous antigens. They are often directed against highly conserved epitopes and bind to ligands of varying chemical composition with low affinity. In this study we cloned and characterized a natural mouse monoclonal IgM antibody selected by binding to malondialdehyde acetaldehyde epitopes on low-density lipoprotein (LDL). Interestingly, the IgM antibody cross-reacted with Aggregatibacter actinomycetemcomitans (Aa) bacteria, a key pathogenic microbe in periodontitis reported to be associated with risk factor for atherosclerosis, thus being named as Aa_Mab. It is more intriguing that the binding molecule of Aa to Aa_Mab IgM was found to be Aa chaperonin 60 or HSP60, a member of heat-shock protein family, behaving not only as a chaperone for correct protein folding but also as a powerful virulence factor of the bacteria for inducing bone resorption and as a putative pathogenic factor in atherosclerosis. The findings will highlight the question of whether molecular mimicry between pathogen components and oxidized LDL could lead to atheroprotective immune activity, and also would be of great importance in potential application of immune response-based preventive and therapeutic strategies against atherosclerosis and periodontal disease.

Interests in health care technology assessment (HCTA) and HCTA training needs in eight European countries: COMETT-ASSESS

Between mid-1991 and mid-1992, nearly 300 different organisations involved in European health care contributed their views to a survey covering a range of topics relevant to health care technology assessment (HCTA) and economic appraisal of health technologies. Organisations who participated included manufacturers, health care institutions, professional associations, health care reimbursement or funding agencies, academic institutions and policy making agencies in eight European countries. The study was carried out as part of a larger project, COMETT-ASSESS, funded partially by the EC COMETT programme, to design and deliver training in health care technology assessment and socioeconomic evaluation. The survey demonstrates a high level of interest in assessment of health care technologies among European organisations, regardless of the type of organisation. Eight out of ten organisations report high-medium levels of interest in using HCTA in their decision making. A similar proportion report high-medium interest in increasing their general understanding of HCTA, and 2 out of 3 in carrying out assessments. All organisations clearly identify a need to train their staff in HCTA. The two key groups of staff requiring training are managers and clinicians. Manufacturers also report a need to train their marketing staff. The principal reason for training is in order to improve the use staff make of HCTA in their decision-making. This finding indicates that it may not be sufficient for European countries to develop effective HCTA dissemination strategies which improve the flow of information on technology assessment results; decision-makers within the organisations targeted will also need training, if they are to use this information effectively. As well as a need to train decision-makers, organisations also report a need to train their researchers, and to a lesser extent their own trainers. When it comes to the types of technologies which need to be assessed, organisations consistently report that they are interested in assessment of accepted health technologies, as well as new or recently introduced ones. In contrast, to date the major emphasis in many HCTA programmes has been on technologies which are yet to enter the service setting. More thought now needs to be given to developing methodologies for assessing technologies once they have reached the service setting. For this the presence of a skilled and well-trained group of health personnel will also be necessary.(ABSTRACT TRUNCATED AT 400 WORDS)

Comparison of trends in ischaemic heart disease between North Karelia, Finland, and Kaunas, Lithuania, from 1971 to 1987

OBJECTIVE

To compare the long-term trends in mortality and attack rate of ischaemic heart disease in North Karelia, Finland, and in Kaunas, Lithuania, from 1971 to 1987.

DESIGN

Data on routine mortality statistics were obtained from the Central Statistical Office of Finland and from the Central City Archives of Kaunas. In addition, data from the community based myocardial infarction registers were used. The registers used similar diagnostic criteria and had operated in both areas during the entire study period.

SETTING

The province of North Karelia in Finland and the city of Kaunas in Lithuania.

SUBJECTS

The target populations were the people of North Karelia and Kaunas aged 35-64 years.

MAIN OUTCOME MEASURES

Mortality from ischaemic heart disease and the attack rate of acute myocardial infarction.

RESULTS

In North Karelia mortality from ischaemic heart disease and the attack rate of acute myocardial infarction declined steeply both in men and women. This decline was accompanied by a decrease in total mortality. In Kaunas, both mortality and the attack rate increased in men but remained unchanged in women. In 1985 to 1987, age standardised total mortality per 100,000 inhabitants was similar in the two populations in men (1081 (95% confidence interval (CI) 1013 to 1149), in North Karelia; 1082 (95% CI 1032 to 1132), in Kaunas). The proportional mortality from ischaemic heart disease was considerably higher in North Karelia (40%) than in Kaunas (28%). In women, age standardised total mortality was lower in North Karelia (350 (95% CI 312-388)) than in Kaunas (440 (95% CI 413 to 467)). The proportional mortality from ischaemic heart disease in women was also higher in North Karelia (28%) than in Kaunas (13%).

CONCLUSIONS

Despite the remarkable decline in the occurrence of ischaemic heart disease, it still remains the most important cause of premature mortality in North Karelia. In Kaunas ischaemic heart disease mortality and attack rate increased in men. Experiences from successful cardiovascular disease prevention programmes in western countries, such as the North Karelia Project, should be exploited to prevent an increasing epidemic of ischaemic heart disease in eastern Europe.

Acute myocardial infarction (AMI) in Finland--baseline data from the FINMONICA AMI register in 1983-1985

The acute myocardial infarction (AMI) register of the FINMONICA study, the Finnish part of the WHO-coordinated multinational MONICA project, operates in the provinces of North Karelia and Kuopio in eastern Finland and in Turku, Loimaa and in communities around Loimaa in southwestern Finland. The AMI register serves as an instrument for the assessment of trends in mortality from coronary heart disease (CHD) and of the incidence and attack rates of AMI among 25-64-year-old residents of the study areas. This report describes the methods used in the FINMONICA AMI register and the findings during the first 3 years of the study, in 1983-1985. The criteria of the multinational WHO MONICA project were used in the classification of fatal events and in the diagnosis of non-fatal definite AMI, but based on the experience within the FINMONICA study, stricter diagnostic criteria than those originally described in the WHO MONICA protocol were used for non-fatal possible AMI. This led to a marked improvement in the comparability of the data from the three study areas with regard to the incidence and attack rates of non-fatal AMI. During the 3-year period the total number of registered events was 6266 among men and 2092 among women. Among men the incidence and attack rates of AMI and mortality from CHD were higher in eastern than in southwestern Finland. Also among women the incidence and attack rates of AMI were higher in eastern than in southwestern Finland, whereas there was no regional difference in mortality from CHD among women. The mortality findings of the FINMONICA AMI Register were in good agreement with the official CHD mortality statistics of Finland.

Medical technology assessment in Finland

We need five kinds of people to guide us further through the integrated process of medical technology assessment: (a) idea generators; (b) entrepreneurs/product, process and practice "champions"; (c) program managers; (d) gatekeepers/communicators; and (e) sponsors/"coaches." If we focus on idea generators, empirical research quickly points out a significant difference between people who create ideas and those who apply the ideas that others have generated. Entrepreneurs and product "champions" promote change and innovation, take ideas, and attempt to move them forward in organizations to gain their adoption. The third necessary contributor to development in medical technology assessment is referred to as the program manager, the person who handles the supportive functions of planning, scheduling, and finance. Communicators are crucial in getting the results of assessment efforts disseminated. The sponsor or the "coach" is a more senior person who does not carry out the research or directly champion change but who provides the encouragement, support, facilitation, and help in "bootlegging activities" that are necessary to aid junior people in their attempts to move research advances forward in an organization. Whether we find these kinds of people in Finland or not--and how long we take to do so--will determine the path of medical technology assessment in Finland toward the year 2000 and beyond.

A cross-sectional ecological analysis of blood pressure and its determinants in eleven Pacific populations

A cross-sectional interpopulation analysis of blood pressure and its determinants was conducted with the data collected during epidemiologic surveys in 11 Pacific island populations from 1975 to 1981. In each of these populations, the mean arterial blood pressure increased with age; the overall blood pressure levels differed among the populations. The multivariate analyses suggest that dietary factors that result in differences in body mass, plasma cholesterol, and glucose intolerance contribute considerably to interpopulation differences in blood pressure. The impact of these differences in effects of dietary factors on interpopulation blood pressure seemed to be uniform, even though the overall levels of each of these three variables differed significantly among the populations. This study of blood pressure data, accrued from 6224 men and 7029 women aged 20-79 years, supports the hypothesis that dietary factors strongly contribute to high blood pressure as well as to interpopulation differences in the prevalence of hypertension. We propose using these data in planning programs for prevention and control of hypertension in the Pacific countries.

Prevalence of ischaemic ECG abnormalities according to the diabetes status in the population of Fiji and their associations with other risk factors

The prevalence of ECG abnormalities indicating the presence of coronary heart disease was examined in the Melanesian (444 men and 457 women) and Asian Indian (408 men and 435 women) population living in Fiji. The aim of the present analysis was to determine the levels of coronary risk factors in people with diabetes, impaired glucose tolerance (IGT) or normal glucose tolerance. The prevalence of ECG abnormalities suggesting coronary heart disease (Q-waves, ST-depression or T-wave changes) was higher among women than men and among Asian Indians than Melanesians. The prevalence of ECG abnormalities was highest in diabetic subjects, intermediate in people with IGT and lowest in people who had normal glucose tolerance. People with IGT were more likely than others to have high risk factor levels. In people with IGT the increased levels of other coronary risk factors might explain a great deal of the increased prevalence of the ECG abnormalities as compared with the prevalence in those with normal glucose tolerance. Also in diabetic subjects, the levels of other coronary risk factors were increased in those who had ECG abnormalities, but not more than was the case with IGT, so that diabetes itself seemed to remain as the major identified risk factor for ECG abnormalities. The prevalence of diabetes in our study populations, especially in Asian Indians, was very high. This suggests that diabetes is the major risk factor for coronary heart disease in such populations.

Liver transplantation in Europe--present status

Liver transplantation is an exciting new therapeutic procedure that over the past few years has shown signs of increasing interest among physicians and health care providers (26;36). The history of liver transplantation dates back to the immediate post-World War II years when early experiments showed the technical feasibility of transplanting a functioning liver into a recipient, either heterotopically as an accessory organ or orthotopically, i.e., by complete replacement of the original organ (29).