 | Malfunction of the mitochondria (blue) may underlie problems of aging such as hypertension and high blood cholesterol. |
Researchers at Yale and Syracuse universities have found the first direct evidence for a mutation in mitochondrial DNA that affects blood pressure and cholesterol levels.
It has long been known that several metabolic traits including high cholesterol and hypertension cluster in some individuals more frequently than by chance, but the underlying causes were unknown. This study, published in Science Express on line, suggests that altered mitochondria may account for the clustering as well as the disorders.
"Looking further, this finding raises the possibility that all features of the metabolic syndrome may be attributable to altered mitochondrial function," says Richard T. Lifton, the Sterling Professor and chair of genetics at Yale and research team leader.
Metabolic syndrome is an emerging problem in industrial societies and is epidemic in the United States. The symptoms include high blood pressure, cholesterol and triglycerides, insulin resistance, obesity and low HDL (i.e., "good cholesterol"). There is independent evidence that altered mitochondrial function plays a role in insulin resistance and high triglyceride levels, and the current finding indicates that these other components of metabolic syndrome may also be linked to mitochondrial disfunction.
The clear correlation of mutation and disorder in this study was made possible by the evaluation of 142 people in four generations of an affected family. Although family members with each disorder -- hypertension, hypercholesterolemia and hypermagnesemia -- have the same mitochondrial mutation, the presence of the mutation but does not produce all of the symptoms in each individual, report the researchers.
While this study focuses on a rare mutation in mitochondria that provides a clear link to specific disorders, mitochondrial function is known to decline with age in normal people and may be contributing to these common traits in the general population, say the scientists.
Other members of the research team included Frederick H. Wilson, Ali Hariri, Anita Farhi, Hongyu Zhao, Kitt Falk Petersen, Hakan R. Toka, Carlo Nelson-Williams, Michael Kashgarian and Gerald I. Schulman at Yale, and Khalid M. Raja and Steven J. Scheinman at Syracuse University. Grants from the National Institutes of Health, the Howard Hughes Medical Institute and the American Heart Association supported this research.
-- By Janet Rettig Emanuel
T H I S
Researchers have linked mitochondrial mutation to problems with blood
pressure and cholesterol levels
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