Protein repair defects linked to hidden heart failure
Researchers at the Medical University of South Carolina (MUSC) have identified defects in the protein repair system linked to idiopathic dilated cardiomyopathy (IDCM). According to a study published in the Journal of Molecular and Cellular Cardiology, these defects involve post-translational modifications (PTMs) that trigger heart cell death and mirror patterns seen in Alzheimer’s disease.
Why are protein plaques forming in the heart?
The del Monte Lab discovered that patients with IDCM possess peculiar, misfolded protein plaques. These clusters resemble the plaques found in the brains of those with Alzheimer’s disease, according to clinician-scientist Federica del Monte, M.D., Ph.D.
The research team found that the problem isn’t necessarily the amount of protein present, but rather how those proteins are activated. They identified defects in the three major branches of the protein repair system, specifically regarding post-translational modifications, or PTMs.
These PTMs act as the machinery’s regulators. When these modifications are abnormal, they disrupt the system’s ability to respond to stress signals from misfolded proteins, which can lead to heart cells self-destructing.
How does IDCM relate to Alzheimer’s disease?
The study suggests that IDCM and Alzheimer’s may both be viewed as protein misfolding diseases. Dr. del Monte noted that an Alzheimer’s gene and the natural process of aging can worsen the effect of PTMs on the heart.
Because characteristics of IDCM can appear in the heart before Alzheimer’s symptoms manifest in the brain, Dr. del Monte suggests the heart may serve as a “window to the brain.”
This link has led to the introduction of IDCM screening within Alzheimer’s clinics. Doctors may use heart ultrasounds to detect an enlarged and weakened left ventricle, a telltale sign of IDCM.
What happens next for diagnosis and treatment?
The findings may open doors to new therapies. Dr. del Monte mentioned that studying the protein repair system at this level of detail is a requirement for progress and noted that similar approaches are already being tested in cancer research.
Camilla Bacchin, M.D., a postdoctoral fellow and co-first author, indicated that the next steps could involve validating bench studies through clinical trials. This process may help identify molecular changes that serve as early biomarkers of the disease.
Future efforts are likely to rely on interdisciplinary collaborations. The del Monte lab is currently coordinating work across neurology, cardiology, and nuclear medicine to pave a path toward shared diagnosis and treatment for both heart failure and Alzheimer’s.
Frequently Asked Questions
What is idiopathic dilated cardiomyopathy (IDCM)?
IDCM is a heart muscle condition that often goes unnoticed until a patient reaches advanced heart failure.
What are post-translational modifications (PTMs)?
PTMs are key alterations to the machinery of the protein repair system that regulate its activity.
How can a heart ultrasound help Alzheimer’s patients?
Ultrasounds can detect an enlarged and weakened left ventricle, which is a characteristic of IDCM and may be linked to the same protein misfolding issues found in Alzheimer’s.
Do you believe interdisciplinary screenings between the heart and brain should become a standard part of preventative care?