DEC 02, 2018 5:24 PM PST

Dogs Get Heart Disease Too

WRITTEN BY: Kara Marker

Scientist are studying mitral valve disease - the dog version. It’s not too different from the human version, and any discoveries made could improve treatment options for humans and canines alike.

Cross-section of a severely diseased heart valve in a dog with myxomatous mitral valve disease and congestive heart failure. Credit: Tufts University

Myxomatous mitral valve disease (MMVD) is the most commonly acquired heart disease for dogs. It leads to congestive heart failure, and a dog’s risk of developing it only increases as the dog grows older. After the disease reaches congestive heart failure, the dog usually doesn’t live too much longer.

From the Cummings School of Veterinary Medicine at Tufts University, researchers conducted a study of 47 healthy and diseased dogs. They looked for changes in gene expression from microRNA (miRNA) found in small cavities, called extracellular vesicles or exosomes, that are secreted by cells and float along in the blood stream alongside blood cells and plasma. Exosomes and the miRNA found inside of them is a new field of study.

They began by comparing dogs with heart disease to healthy dogs, including a study of the impact of age. The dogs were given a physical examination, echocardiography was conducted, and blood samples were taken. Researchers looked at changes in miRNA expression in exosomes, comparing it to miRNA expression in plasma. Depending on whether the dogs were healthy, had asymptomatic MMVD, or had MMVD and congestive heart failure, different types of miRNAs were associated with different disease states.

"These results suggest that [exosome] miRNA expression changes may be more specific to disease states than total plasma miRNA," explained corresponding author Andy Hoffman, D.V.M., Ph.D. "These plasma Ex-miRNAs show great promise as biomarkers for MMVD disease monitoring and may also help us understand the pathophysiology of the disease, and subsequently devise more specific molecular therapies that can halt disease progression."

This discovery is the first of its kind in veterinary medicine.

What does this discovery mean? Expression of miRNA in circulating exosomes is a genomic biomarker that researchers can apply to diagnostic standards, disease maintenance, and potentially even treatments for canine MMVD and a similar disease in humans called mitral valve prolapse (MVP).

MVP, the “human version” of a dog’s MMVD, is characterized by destruction of collagen and elastin fibers in the heart’s valves. The condition leads to mitral regurgitation and, eventually, congestive heart failure. Surgery to repair mitral regurgitation is possible, but it’s only effective before the condition has progressed to congestive heart failure.

"There are currently no medical treatments available to delay the progression of these valvular diseases," explained first author Vicky Yang, D.V.M., Ph.D. "While these new molecular signatures in exosomes require further study, the findings could open doors to novel molecular targets to slow or halt the progression of mitral valve disease to heart failure."

This study was published in the Journal of Extracellular Vesicles.

Source: Tufts University

About the Author
  • I am a scientific journalist and enthusiast, especially in the realm of biomedicine. I am passionate about conveying the truth in scientific phenomena and subsequently improving health and public awareness. Sometimes scientific research needs a translator to effectively communicate the scientific jargon present in significant findings. I plan to be that translating communicator, and I hope to decrease the spread of misrepresented scientific phenomena! Check out my science blog: ScienceKara.com.
You May Also Like
APR 01, 2021
Health & Medicine
Flavanol-rich Foods Protect Heart from Stress
APR 01, 2021
Flavanol-rich Foods Protect Heart from Stress
Drinking hot cocoa is comforting on cold winter nights, and new research from the University of Birmingham shows that it ...
JUN 21, 2021
Health & Medicine
Essential Hypertension: The Basics
JUN 21, 2021
Essential Hypertension: The Basics
Also known as primary hypertension, essential hypertension is high blood pressure without a specific, known cause. It is ...
JUL 13, 2021
Health & Medicine
The Science of Crying
JUL 13, 2021
The Science of Crying
Crying: In humans, it's the production of tears usually accompanied by facial muscle contractions and vocal sounds. ...
SEP 05, 2021
Cardiology
Eating Walnuts & Pecans Can Help Lower 'Bad' Cholesterol
SEP 05, 2021
Eating Walnuts & Pecans Can Help Lower 'Bad' Cholesterol
Some nuts, especially walnuts, have high levels of healthy fats like Omega-3. New research reported in Circulation has s ...
SEP 15, 2021
Cardiology
Reducing Sugar in Packaged Foods May Protect Millions From Disease
SEP 15, 2021
Reducing Sugar in Packaged Foods May Protect Millions From Disease
For years, scientists have tried to learn more about whether addedor excess dietary sugars are harmful to a person's hea ...
SEP 26, 2021
Cardiology
New Type of Artificial Heart Tested in Several Patients Shows Promise
SEP 26, 2021
New Type of Artificial Heart Tested in Several Patients Shows Promise
In July, a new type of artificial heart was been implanted for the first time in a US patient at Duke University Medical ...
Loading Comments...