A groundbreaking discovery by researchers at Texas A&M University has shed light on the critical issue of bone healing in individuals with Down syndrome (DS). With an estimated 350,000 people in the United States living with DS, this genetic condition poses unique challenges, particularly when it comes to bone health. The research team, led by Dr. Lindsay Dawson, has uncovered a troubling reality: bone fractures in individuals with DS often fail to heal, and this can have fatal consequences.
Thanks to a generous $1.8 million grant from the National Institutes of Health, the Texas A&M College of Veterinary Medicine and Biomedical Sciences (VMBS) has delved deeper into this issue. Their findings reveal a disturbing trend: bone healing becomes increasingly difficult as individuals with DS age.
"Down syndrome is characterized by a decrease in both bone degradation and formation, which are essential stages in the bone healing process," explains Dr. Dawson, an assistant professor in the VMBS' Department of Veterinary Physiology and Pharmacology (VTPP). The Dawson lab specializes in regeneration biology, aiming to understand the factors that hinder regeneration in animals, with the ultimate goal of enhancing human limb regeneration and improving quality of life after traumatic injuries.
Dr. Dawson further clarifies, "Bone degradation is akin to preparing a construction site before laying the foundation of a new building. Bone formation is when the actual repair process begins."
Advances in medicine have enabled individuals with DS to lead longer, more active lives, but this increased longevity comes with a heightened risk of bone injuries.
In a recently published study, Dr. Dawson's team aimed to understand how bone health evolves throughout the lifespan of individuals with DS. Their research, conducted using a DS model, revealed that bone healing deteriorates significantly in aging males with DS. Interestingly, females with DS were also found to experience poor bone healing outcomes after reaching middle age, despite having no previous issues.
While DS is often associated with accelerated aging, Dr. Dawson and her team have demonstrated that the issues with bone healing may have a distinct cause.
Sarah Wolff, a VTPP doctoral student, elaborates, "Individuals with DS often experience early onset menopause, thyroid dysfunction, Alzheimer's disease, and cartilage and bone abnormalities associated with aging. However, our data suggests that poor bone healing is not merely a result of accelerated aging."
The ultimate goal of Dr. Dawson, Wolff, and their research team is to utilize the findings from their grant-funded research to develop effective treatments, thereby reducing the threat of bone fractures and enhancing the quality of life for individuals with DS.
The regenerative treatments developed by Dr. Dawson and her colleagues will also prove invaluable in assisting individuals with limb loss.
"Approximately 2.1 million people in the U.S. are currently living with limb loss, and this number is expected to more than triple by 2060 due to the increasing prevalence of vascular diseases like diabetes," Dr. Dawson notes. "Understanding the mechanisms of bone regeneration is crucial for developing new treatments, including the potential for regrowing entire limbs."
Unraveling the complexities of bone healing in DS is a challenging task, but one that is essential for developing effective treatments.
Dr. Dawson highlights an intriguing aspect of their recent studies: "Other bodily systems, such as the ability to heal skin wounds, remain unaffected. The problems are very specific to bone healing, which is encouraging news. Once we identify all the bone healing genes affected by DS, we can focus our efforts and develop a targeted regenerative medicine strategy."
Despite already making significant progress, Dr. Dawson and her team continue to explore new avenues in their pursuit of a treatment for poor bone healing in DS.
"One of our ongoing studies employs a different model that accounts for the variability among humans. Even individuals with DS can differ significantly from one another. We aim to develop a treatment that benefits real people, and this requires an understanding of individual differences," Dr. Dawson explains.
The research team is also conducting a study focused on older middle-aged health, utilizing a model that represents individuals with DS up to 50 years of age. Additionally, they plan to initiate testing of potential treatments, including various anabolic agents known for promoting bone growth.
This groundbreaking research offers hope for individuals with DS and those facing limb loss, highlighting the potential for regenerative medicine to transform lives.
