In contrast, about one-third of adults in the United States have chronically elevated C-reactive protein (CRP). Acute elevations in CRP – a protein in the blood whose levels rise as part of the inflammatory response – are important for protecting us against infectious disease. But when CRP is chronically produced, it is associated with chronic diseases.
"In other words, CRP goes up when you need it, but it is almost undetectable when you don't, after the infection resolves," said Thomas W. McDade. "This is a pretty remarkable finding, and very different from prior research in the U.S., where lots of people tend to have chronically elevated CRP, probably putting them at higher risk for chronic disease."
McDade said the findings build on his previous research in the Philippines, which found that higher levels of microbial exposure in infancy were associated with lower CRP as an adult. Similar exposures during infancy in lowland Ecuador, where rates of infectious disease continue to be high, may have a lasting effect on the pattern of inflammation in adulthood.
"In my mind the study underscores the value of an ecological approach to research on the immune system, and it may have significant implications for our understanding of the links between inflammation and chronic disease," McDade said. "This may be particularly important since nearly three-quarters of all deaths due to cardiovascular disease globally now occur in low- and middle-income nations like the Philippines and Ecuador."
The new research suggests that higher levels of exposure to infectious microbes early in life may change how we regulate inflammation as adults in ways that prevent chronic inflammation from emerging. Infectious microbes have been part of the human ecology for millennia, and it is only recently that more hygienic environments in affluent industrialised settings have substantially reduced the level and diversity of exposure.
A growing body of research has shown that higher levels of chronic inflammation are associated with diseases of aging like cardiovascular disease, diabetes and dementia. But current research is based almost exclusively on people living in affluent industrialised countries like the United States.
"We simply do not know what chronic inflammation looks like in places like the Ecuadorian Amazon and other parts of the world where infectious diseases are more common," McDade said.
MEDICA.de; Source: Northwestern University