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We sit down with Dr. Lynn Pezzanite to explore a promising angle on aging-related equine osteoarthritis (OA): cellular senescence, the pro-inflammatory state where cells release a senescence-associated secretory phenotype (SASP) that can amplify damage inside tissues over time.

We walk through why horses are such a valuable One Health model for osteoarthritis research and why this team compared synovial fluid cells from the joint with peripheral blood mononuclear cells from circulation. Using single-cell RNA sequencing, the study teases apart immune and cellular heterogeneity that bulk methods can blur. One of the most striking takeaways is the compartment split: senescence-associated pathways can be down in peripheral blood yet up in synovial cells, suggesting the joint environment may create a more intense, specialized senescent phenotype.

We also dig into the immune cell story, including why dendritic cells and gamma delta T cells keep showing up as important across both chronic natural OA and early post-traumatic OA work. Then we shift to what this could mean clinically: the promise and cautions around senescence-targeted therapies and the practical case for local intra-articular delivery. Finally, we talk translational hurdles like equine-specific dosing and safety, plus the next research steps to connect senescence burden with OA pain and treatment response.

If you care about equine lameness, osteoarthritis biomarkers, and the future of disease-modifying OA therapy, subscribe, share this with a colleague, and leave us a rating and review wherever you listen.

AJVR article: https://doi.org/10.2460/ajvr.25.09.0343

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