Injections of a natural energy molecule prompted regrowth of almost half of the cartilage lost with aging in knees, a new study in rodents shows.
The study results revolve around the long-established idea that machines within animal and human cells turn the sugars, fats, and proteins we eat into energy used by the bodys millions of cells. The molecule most used to store that energy is called adenosine triphosphate, or ATP. Along with this central role in metabolism, adenosine also helps signal other cells and serves as a building block of genetic material, and so is central to the growth of human tissue.
Previous research had shown that maintaining supplies of adenosine, known to nourish the chondrocyte cells that make cartilage, also prevented osteoarthritis in similar animal models of the disease.
In the new NYU Grossman School of Medicineled study, researchers injected adenosine into the joints of rodents whose limbs had been damaged by inflammation resulting from either traumatic injury, such as a torn ligament, or from massive weight gain placing pressure on joints. The biological damage in these cases is similar, researchers say, to that sustained in human osteoarthritis.
Published online in the journal Scientific Reports on August 10, the study rodents received 8 weekly injections of adenosine, which prompted regrowth rates of cartilage tissue between 50 percent and 35 percent as measured by standard laboratory scores.
Our latest study shows that replenishing adenosine stores by injection works well as a treatment for osteoarthritis in animal models of the disease, and with no apparent side effects, says lead study author Carmen Corciulo, PhD, a postdoctoral fellow at NYU Langone.
Dr. Corciulo says it is too soon to use this experimental model as a therapy in people. Clinical trials must await a test drug that can be safely stored for days if not weeks, and experiments in larger mammals.
Study senior investigator Bruce N. Cronstein, MD, the Dr. Paul R. Esserman Professor of Medicine at NYU Langone Health, says the teams research is important because the few existing drug therapies for osteoarthritis such as acetaminophen and COX-2 inhibitor drugs, including naproxen and ibuprofen, only numb joint pain, or like hyaluronic acid just lubricate its tissues. None stall disease progression or reverse the damage. Painkillers, such as opioids, are often prescribed, but are also highly addictive, he cautions.
People with osteoarthritis desperately need more treatment options with fewer side effects, and our research advances that effort, says Dr. Cronstein, who also serves as the director of NYU Langones Clinical and Translational Science Institute. He notes that other experimental medications are being developed elsewhere, including parathyroid hormone to stimulate bone growth, WNT inhibitor drugs to block the bone and cartilage degradation, and growth factor chemicals to promote cartilage growth.
Dr. Cronstein, Dr. Corciulo, and NYU Grossman School of Medicine have a patent application pending for the use of adenosine and other agents that help with its binding to chondrocytes, called A2A receptor agonists, for the treatment of osteoarthritis.
Among the studys other key findings was that a cell-signaling pathway, known as transforming growth factor beta (TGF-beta) and involved in many forms of tissue growth, death, and differentiation, was highly active in cartilage tissue damaged by osteoarthritis, as well as in cartilage tissue undergoing repair after being treated with adenosine. Additional testing in lab-grown chondrocytes from people with osteoarthritis showed different chemical profiles of TGF-beta signaling during breakdown than during growth, providing the first evidence that the pathway switched function in the presence of adenosine (from assisting in cartilage breakdown to encouraging its repair.)
Developing treatments to halt or slow the disease is important, Dr. Cronstein says, because well over 100 million people worldwide are estimated to have osteoarthritis, which is tied to aging, especially in women. This figure, he says, is only expected to grow as more people live longer and obesity rates climb.
Right now, the only way to stop osteoarthritis is to have affected joints surgically replaced, which not only comes with pain and risk of infection, but is also quite costly, says Dr. Cronstein. If new therapies can delay or prevent disease onset and progression, then fewer joint replacements will save people from a lot of pain and expense.
The study was funded by National Institutes of Health grants R01 AR056672 and R01 AR068593, NYU-HHC Clinical and Translational Science Institute grant UL1 TR000038, and the Arthritis Foundation.
Dr. Corciulo and Dr. Cronstein have a patent for the methods and compositions for treating osteoarthritis and promoting cartilage formation (U.S. Patent 10,441,541), which has been assigned to NYU Grossman School of Medicine. They are cofounders of Regenosine Inc., a company that is developing new treatments for osteoarthritis, and in which they hold a financial interest. Dr. Cronstein has consulted for Eli Lilly, Horizon Pharmaceuticals, Bristol Myers Squibb, and Astrazeneca. He also has grants from Arcus Biopharma. All relationships are being managed in accordance with the policies and practices of NYU Langone.
Besides Dr. Cronstein and Dr. Corciulo, other NYU Langone investigators involved in this study are Cristina Castro, MD; Thomas Coughlin, PhD; Samson Jacob, MS; David Fenyo, PhD; Daniel B. Rifkin, PhD; and Oran Kennedy, PhD.
David March Phone: 212-404-3528 david.march@nyulangone.org
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New Approach to Treating Osteoarthritis Advances | NYU Langone News - NYU Langone Health
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