Holly Van Remmen
Job Description
In the year 1900, the average U.S. lifespan was 46 years for men and 48 years for women. In 2013, the average was 76 for men and 81 for women. Advances in medical science and human health have people living longer, but new challenges arise with an extended lifespan.
Research in my lab focuses on aging. One question we’re keen to answer is: Why do people lose muscle as they get older? It’s a normal part of aging, but it bears similarity to a disease called sarcopenia, in which the body loses skeletal muscle mass. Using a mouse model of sarcopenia, we’re looking specifically at the role of oxidative stress, or free radicals, in the long-term deterioration of muscle. As part of this research, we are studying how mitochondria are affected by aging and might contribute to aging. Mitochondria are present in all cells and are responsible for generating energy and controlling metabolism and also for producing the majority of oxidative stress as a by-product of their function.
Another disease in which oxidative stress affects muscles is amyotrophic lateral sclerosis, often called ALS or Lou Gehrig’s disease. In ALS, a group of cells called motor neurons is affected, reducing a patient’s ability to control their muscles. We also use a mouse model of ALS to study how the loss of an enzyme affects motor neurons.
Importantly , we are now testing potential interventions to reduce or delay loss of muscle and weakness in aging and motor neuron degeneration in aging and ALS. We hope to move some of our findings to the clinic in the future. Our goal is not to find a “fountain of youth,” but to address the declining quality of life as we age. It’s important that our “healthspan” matches our lifespan.
