Lamellar pro-inflammatory cytokine expression patterns in laminitis at the developmental stage and at the onset of lameness: innate vs. adaptive immune response.

Summary

# Lamellar Immune Response in Early Laminitis: Innate Versus Adaptive Pathways Laminitis progression involves complex inflammatory cascades in its earliest stages, yet the specific immune mechanisms driving lamellar tissue failure remained poorly characterised when this research was conducted. Belknap and colleagues examined cytokine expression patterns in the lamellae at two critical timepoints—during the developmental (pre-clinical) phase and at the onset of clinical lameness—to distinguish whether innate or adaptive immune responses predominated in driving tissue damage. Their findings revealed distinctly different inflammatory signatures at each stage, with innate immune markers dominant during early development and adaptive responses becoming more prominent as lameness emerged. Understanding these temporal shifts in immune activation is crucial for practitioners, as it suggests that therapeutic windows for immunomodulatory intervention differ depending on disease stage, and that broad anti-inflammatory protocols may be less effective than stage-specific approaches targeting the dominant immune pathway. This work fundamentally reframes laminitis management strategy: rather than treating all inflammatory laminitis identically, clinicians should consider whether interventions are being deployed during the innate-dominated or adaptive-dominated phase to optimise efficacy.

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Key Findings

• •Inflammation is implicated in early stages of laminitis development, similar to mechanisms in human septic organ failure
• •Characterization of innate versus adaptive immune responses is essential for understanding lamellar pathophysiology
• •Early inflammatory mechanisms may trigger downstream events leading to lamellar structural failure

Conditions Studied