A new study is further burnishing copper’s reputation as an essential nutrient for human physiology. A research team led by a scientist at the Department of Energy’s Lawrence Berkeley National Laboratory (Berkeley Lab) and at the University of California– Berkeley has found that copper plays a key role in metabolizing fat.
Long-prized as a malleable, conductive metal used in cookware, electronics, jewelry, and plumbing, copper has been gaining increasing attention over the past decade for its role in certain biological functions. It has been known that copper is needed to form red blood cells, absorb iron, develop connective tissue, and support the immune system.
Dietary Copper
Chang said that copper could potentially play a role in restoring a natural way to burn fat. The nutrient is plentiful in foods such as oysters and other shellfish, leafy greens, mushrooms, seeds, nuts, and beans.“Copper is not something the body can make, so we need to get it through our diet,” Chang said. “The typical American diet, however, doesn’t include many green leafy vegetables. Asian diets, for example, have more foods rich in copper.”
A ‘Brake on a Brake’
The researchers made the copper-fat link using mice with a genetic mutation that causes the accumulation of copper in the liver. Notably, these mice have larger than average deposits of fat compared with normal mice.The inherited condition, known as Wilson’s disease, also occurs in humans and is potentially fatal if left untreated.
Analysis of the mice with Wilson’s disease revealed that the abnormal buildup of copper was accompanied by lower than normal lipid levels in the liver compared with control groups of mice. The researchers also found that the white adipose tissue, or white fat, of the mice with Wilson’s disease had lower levels of copper compared with the control mice and correspondingly higher levels of fat deposits.
They then treated the Wilson’s disease mice with isoproterenol, a beta agonist known to induce lipolysis, the breakdown of fat into fatty acids, through the cyclic adenosine monophosphate (cAMP) signaling pathway. They noted that the mice with Wilson’s disease exhibited less fat-breakdown activity compared with control mice.
They found that copper binds to phosphodiesterase 3, or PDE3, an enzyme that binds to cAMP, halting cAMP’s ability to facilitate the breakdown of fat.
Hints From Cows
The connection between copper and fat metabolism is not altogether surprising. The researchers actually found hints of the link in the field of animal husbandry.“It had been noted in cattle that levels of copper in the feed would affect how fatty the meat was,” said Chang. “This effect on fat deposits in animals was in the agricultural literature, but it hadn’t been clear what the biochemical mechanisms were linking copper and fat.”
Of the copper in human bodies, there are particularly high concentrations found in the brain. Recent studies, including those led by Chang, have found that copper helps brain cells communicate with each other by acting as a brake when it is time for neural signals to stop.
Co-lead authors of the study are Lakshmi Krishnamoorthy and Joseph Cotruvo Jr., both UC Berkeley postdoctoral researchers in chemistry with affiliations at Berkeley Lab.
Friends Read Free