Cytokine dysregulation in aged horses and horses with pituitary pars intermedia dysfunction.

Summary

# Cytokine dysregulation in aged horses and horses with pituitary pars intermedia dysfunction Pituitary pars intermedia dysfunction (PPID) in horses involves progressive neurodegeneration of dopamine-secreting neurons in the hypothalamus, yet the inflammatory mechanisms driving this condition remain poorly understood. McFarlane and Holbrook investigated whether chronic cytokine dysregulation contributes to PPID pathogenesis by comparing inflammatory markers between aged horses, PPID-affected horses, and younger controls. Their findings demonstrated significantly elevated circulating pro-inflammatory cytokines in both aged and PPID-positive horses, suggesting that systemic inflammation is associated with hypothalamic neurodegeneration. This work establishes chronic inflammatory dysregulation as a potential driver of the neurological changes underlying PPID, opening new avenues for understanding why some aged horses develop the condition whilst others do not. For practitioners, these results suggest that managing systemic inflammation through nutrition, stress reduction, and appropriate medical intervention may warrant consideration as part of a comprehensive PPID management strategy, though further research is needed to establish causation and optimise therapeutic approaches.

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Key Findings

• •PPID results from loss of dopaminergic inhibition of the pars intermedia secondary to periventricular hypothalamic neurodegeneration
• •Chronic inflammation may contribute to initiation or progression of PPID
• •Pathologic mechanisms contributing to neurodegeneration and clinical signs in PPID remain unknown

Conditions Studied