Light therapy has proven to be an effective treatment for a range of illnesses. But, can it also delay the onset of age-related diseases?
A recent study in mice published in the journal Lasers in Surgery and Medicine suggests that the answer may be yes. Praveen Arany, an expert in photobiomodulation (PBM) therapy from the University at Buffalo, collaborated with Edward G. Lakatta, MD of the National Institute on Aging, a subsidiary of the National Institutes of Health, as a co-principal investigator in the study.
Almost 20% of Americans older than 65 have been diagnosed with heart disease, and heart disease continues to be the leading cause of death in the United States. “The idea was to see if intervention in middle age could enable people to avoid further age-related heart deterioration,” said Arany, Ph.D., DDS, associate professor of oral biology in UB School of Dental Medicine.
The study focused on heart condition and function in middle-aged mice, 14 months of age. The research showed an improvement in heart function after exposure to PBM therapy. PBM also mitigated the thickness of the cardiac wall. “As muscle thickens, it becomes stiffer, and the pumping action of the heart is less effective,” said Arany. Gait symmetry - observing how mice performed comfortably on a treadmill - also improved, suggesting an improvement in neuromuscular coordination.
The experiment exposed mice to a dose of near-infrared light by using an overhead LED light source rather than a focused light source. The ambient low-dose exposure took place five days a week for two minutes each day. One group of the genetically manipulated mice gets severe heart disease, which usually causes death. After treatment with PBM, heart disease among these mice with heart disease did not progress. The survival rate among the most susceptible group was 100%, compared to the usual survival rate of 43%. The results were significant even though the eight-month study was interrupted for three months by COVID-19.
How does PBM work? The study showed that the production of a substance called transforming growth factor beta (TGF-ß1) correlated to exposure to PBM, suggesting that PBM triggers the activation of TGF-ß1. The substance plays an important role in human health and disease, especially in age-related diseases. Arany said that TGF-ß1 regulates stem cell activity, inflammation, and immune system function that may partly explain why light therapy works.
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