Regulation of hypoxia-inducible factor-1α and related genes in equine digital lamellae and in cultured keratinocytes.
Authors: Pawlak E A, Geor R J, Watts M R, Black S J, Johnson P J, Belknap J K
Journal: Equine veterinary journal
Summary
# Editorial Summary Hypoxia and inflammatory cascade activation both feature prominently in the pathophysiology of sepsis-related laminitis, yet the molecular mechanisms linking these events in the digital lamellae remain poorly characterised. Pawlak and colleagues investigated hypoxia-inducible factor-1α (HIF-1α)—a master regulatory protein governing cellular responses to oxygen deprivation and inflammatory signalling—in equine lamellar tissue and cultured keratinocytes to elucidate its role in laminitis development. By examining gene expression patterns under both normoxic and hypoxic conditions, the team identified HIF-1α as a central mediator integrating these two pathological processes within the lamellar epidermis. Understanding HIF-1α regulation offers a mechanistic bridge between recognised triggers of laminitis and downstream tissue failure, potentially opening new avenues for therapeutic intervention targeting this nodal point rather than attempting to address hypoxia and inflammation separately. For practitioners managing at-risk horses during systemic illness or pursuing preventative strategies, this molecular insight underscores why multi-targeted interventions addressing both tissue perfusion and inflammatory burden may be more effective than single-pathway approaches.
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Practical Takeaways
- •HIF-1A represents a potential therapeutic target for sepsis-related laminitis by modulating both hypoxic and inflammatory responses in the lamellae
- •Understanding HIF-1A regulation may inform development of treatments to prevent lamellar tissue damage during systemic inflammatory episodes
- •Further research on HIF-1A inhibition or modulation could lead to novel interventions for acute laminitis management
Key Findings
- •HIF-1A is a central mediator in both hypoxic and inflammatory responses in equine lamellar tissue
- •HIF-1A regulates expression of multiple genes involved in cellular adaptation to hypoxia
- •Both hypoxia and inflammatory signalling pathways converge through HIF-1A in lamellar epidermis