Researchers from The University of Osaka have developed an innovative mRNA-based treatment that could help protect the heart from long-term damage following a heart attack. In a new study, scientists found that delivering a combination of five therapeutic mRNAs directly to damaged heart tissue significantly improved heart function and survival in mice that had experienced myocardial infarction (heart attack).
Heart attacks often trigger a chain of events that can eventually lead to heart failure. The damaged heart undergoes inflammation, scarring, loss of heart muscle cells, and reduced blood supply, making recovery difficult. Existing treatments generally target only one aspect of this damage, limiting their effectiveness. To overcome this challenge, the Osaka research team adopted a multi-target strategy using polymer-based nanomicelles to transport five different mRNAs that encode proteins involved in tissue repair.
The treatment produced encouraging results in preclinical studies. Researchers observed increased formation of new blood vessels, reduced scar tissue development, enhanced tissue regeneration, and lower rates of heart cell death. These benefits translated into stronger heart contractions, improved blood circulation, thicker heart walls, and a higher survival rate among treated animals compared with untreated mice.
According to the investigators, the findings demonstrate that simultaneously addressing multiple pathways involved in cardiac damage may offer a more effective approach to preventing heart failure after a heart attack. The researchers believe this strategy could lay the groundwork for a new generation of regenerative therapies and further expand the role of mRNA technology beyond vaccines into cardiovascular medicine.
The study, titled “Nanomicelle-Based Multi-mRNA Delivery Promotes Cardiac Repair After Myocardial Infarction,” has been published in the journal Small Science.
