Signaling pathways in mitral valve degeneration.

Area of Science:

• Cardiovascular Biology
• Molecular Medicine
• Biomedical Engineering

Background:

• Heart valve structure is maintained by continuous extracellular matrix (ECM) turnover by valve cells.
• Degenerative mitral valve disease (DMVD) is an aging-associated condition affecting both dogs and humans.
• DMVD pathogenesis involves dysregulation of ECM homeostasis through complex signaling pathways.

Purpose of the Study:

• To elucidate the signaling mechanisms underlying degenerative mitral valve disease (DMVD).
• To identify initiating stimuli and key pathways involved in DMVD.
• To explore potential therapeutic targets for halting or slowing DMVD progression.

Main Methods:

• Review of current literature on heart valve pathobiology and signaling.
• Analysis of implicated signaling pathways including serotonin, TGFβ, BMP, Wnt, Notch, nitric oxide, and angiotensin II.
• Comparison of DMVD pathology with known valvulopathies and developmental processes.

Main Results:

• Serotonin signaling, potentially triggered by mechanical stress, initiates TGFβ signaling implicated in canine DMVD.
• DMVD may involve pathological processes mimicking osteogenesis and chondrogenesis, mediated by developmental pathways.
• Multiple signaling pathways, including developmental ones like BMP and Wnt, are implicated in heart valve disease.

Conclusions:

• Understanding signaling pathways like serotonin and TGFβ is crucial for DMVD research.
• Therapeutic strategies targeting these signaling mechanisms could offer new treatments for DMVD.
• Further research into shared developmental pathways may reveal novel insights into heart valve disease.