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Researchers Find New Way to Block Inflammation in Alzheimer’s, Atherosclerosis, and Diabetes
Findings suggest one therapeutic target for multiple diseases (July 1)
Researchers at NYU Langone Medical Center have discovered a mechanism that triggers chronic inflammation in Alzheimer’s disease (AD), atherosclerosis, and type-2 diabetes. The results, published in Nature Immunology, suggest a common biochemical thread to multiple diseases and point the way to a new class of therapies that could treat chronic inflammation in these non-infectious diseases without crippling the immune system.
When the body encounters a pathogen, it unleashes a rush of chemicals known as cytokines that draws immune cells to the site of infection and causes inflammation. Particulate matter in the body, such as the cholesterol crystals associated with vascular disease and the amyloid plaques that form in the brain in AD, can also cause inflammation, but the exact mechanism of action remains unclear. Researchers previously thought that these crystals and plaques accumulate outside of cells, and that macrophages — immune cells that scavenge debris in the body — induce inflammation as they attempt to clear them.
“We’ve discovered that the mechanism causing chronic inflammation in these diseases is actually very different,” said senior author Kathryn J. Moore, PhD.
The researchers found that particulate matter does not linger on the outside of cells. Instead, a receptor called CD36, present on macrophages, draws the soluble forms of these particles inside the cell where they are transformed into substances that trigger an inflammatory response.
“What we found is that CD36 binds soluble cholesterol and protein matter associated with these diseases, pulls them inside the cell, and then transforms them,” Moore said. “The resulting insoluble crystals and amyloid damage the macrophage and trigger a powerful cytokine, called interleukin-1B, linked to a chronic inflammatory response.”
When the researchers blocked the CD36 receptor in mice with atherosclerosis, the cytokine response declined; fewer cholesterol crystals formed in plaques; and inflammation decreased. Consequently, atherosclerosis also abated.
“Our findings identify CD36 as a central regulator of the immune response in these conditions and suggest that blocking CD36 might be a common therapeutic option for all three diseases,” Moore said.
Source: NYU Langone Medical Center; July 1, 2013.