TLR2 links inflammation to neonatal heart regeneration, mouse study finds
Unlike adult hearts, the hearts of newborn mammals can temporarily regenerate after damage. However, this remarkable ability is rapidly lost within the first days of life. In a new study, scientists investigated how neonatal hearts respond to both heart injury and pressure overload, a condition that mimics chronic stress on the heart.
A mouse study has revealed a connection between inflammation and the regeneration of a newborn heart, with immune signals activating a receptor called TLR2 on heart muscle cells. This finding, published in the journal Cell Communication and Signaling, challenges the rapid loss of a heart's regenerative ability in newborn mammals.
In the study, three immune molecules—CCL4, S100A8, and C1QA—were found to work together to activate TLR2, stimulating heart cell proliferation, enhancing survival, and reducing cell death. The researchers, led by Dr. Mona Malek Mohammadi, discovered that TLR2 acts as a crucial hub connecting inflammatory signals to regenerative responses in the neonatal heart.
Genetically modified mice lacking TLR2 were unable to cope with cardiac stress and experienced rapid heart failure, highlighting the receptor's importance in maintaining protective and regenerative responses. The study also noted that TLR2 expression is significantly higher in newborn heart cells compared to adult cells, suggesting that the decline in this signaling pathway could contribute to the reduced regenerative capacity of adult hearts.
The researchers hope these findings will lead to therapies that reactivates neonatal-like repair mechanisms in adult hearts, potentially improving outcomes for patients with myocardial infarction or heart failure.
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