About 10 million people in the United States alone – from troops returning from war to students with music blasting through headphones – are suffering from impairing noise-induced hearing loss. The rising trend is something that researchers and physicians at the Ann Arbor-based University of Michigan (U-M) Kresge Hearing Research Institute are hoping to reverse, with a cocktail of vitamins and the mineral magnesium that has shown promise as a possible way to prevent hearing loss caused by loud noises.
The nutrients were successful in laboratory tests, and now researchers are testing whether humans will benefit, as well. “The prevention of noise induced hearing loss is key,” says Glenn E. Green, MD, assistant professor of otolaryngology at the U-M Health System and director of the U-M Children’s Hearing Laboratory. “When we can’t prevent noise-induced hearing loss through screening programs and use of hearing protection, then we really need to come up with some way of protecting people who are still going to have noise exposure.”
In addition, Glenn says, “my hope is that this medication will give people a richer, fuller life.” The combination of vitamins A, C and E, plus magnesium, is given in pill form to patients who are participating in the research. Developed at the U-M Kresge Hearing Research Institute, the medication, called AuraQuell, is designed to be taken before a person is exposed to loud noises. In earlier testing at U-M on guinea pigs, the combination of the four micronutrients blocked about 80 percent of the noise-induced hearing impairment.
Now, AuraQuell is being tested in a set of fourmultinational human clinical trials: military trials in Sweden and Spain, an industrial trial in Spain, and a trial involving students at the Gainesville-based University of Florida who listen to music at high volumes on their iPods and other PDAs, funded by the National Institutes of Health (NIH). This is the first NIH-funded clinical trial involving the prevention of noise-induced hearing loss.
“If we can even see 50 percent of the effectiveness in humans that we saw in our animal trials, we will have an effective treatment that will very significantly reduce noise-induced hearing impairment in humans. That would be a remarkable dream,” says co-lead researcher Josef M. Miller, PhD, director of the Center for Hearing Disorders at the U-M Department of Otolaryngology’s Kresge Hearing Research Institute. Miller is leading the research along with colleagues at Sweden’s Karolinska Institute, where Miller also has an appointment; the University of Florida; and the University Castille de La Mancha in Spain.
Until a decade ago, it was thought that noise damaged hearing by intense mechanical vibrations that destroyed the delicate structures of the inner ear. There was no intervention to protect the inner ear other than reducing then intensity of sound reaching it, such as ear plugs, which are not always effective. It was then discovered that noise caused intense metabolic activity in the inner ear and the production of molecules that damage the inner ear cells; and that allowed the discovery of an intervention to prevent these effects.
Miller notes that the military tests in the new study could be of particular importance because of the high number of soldiers who develop hearing loss in the line of duty, due to improvised explosive devices (IEDs) and other noises. Last year, he says, the Department of Defense spent approximately $1.5 billion in compensation for hearing impairment, and Veterans Affairs hospitals spent close to $1 billion for clinical care and treatment of hearing impairment.
The most recent figures in a report by the Institute of Medicine indicated that one-third of returning soldiers fighting in Afghanistan and Iraq cannot be redeployed specifically because of hearing impairment. “Not only is it an enormous factor in quality of life for the individual affected, in cost to society for healthcare and compensation,” Miller says, “but it fundamentally compromises the effectiveness of our military at this time.”
Therefore, Miller has launched a U-M startup company called OtoMedicine, which holds the license to developed the vitamin-and-magnesium pill for human application. According to Green, hearing loss commonly occurs when loud noises trigger the formation of molecules inside the ear and these molecules cause damage to the hair cells of the inner ear. The cells then shut down and scar, and they cannot grow back.
Source: University of Michigan Health System
