Neutrophils are not less sensitive than other blood leukocytes to the genomic effects of glucocorticoids.
Authors: Hirsch Gaelle, Lavoie-Lamoureux Anouk, Beauchamp Guy, Lavoie Jean-Pierre
Journal: PloS one
Summary
# Editorial Summary Glucocorticoids are widely used in equine practice to manage inflammatory conditions, yet longstanding assumptions about their cellular mechanisms warrant scrutiny. Lavoie-Lamoureux and colleagues compared the genomic response of neutrophils against other equine blood leukocytes exposed to dexamethasone, measuring gene expression changes to assess glucocorticoid sensitivity across cell types. Contrary to conventional wisdom suggesting neutrophils are relatively resistant to glucocorticoid effects, the research demonstrated that equine neutrophils exhibit comparable—rather than diminished—genomic sensitivity to these drugs when compared with lymphocytes and other inflammatory cells. These findings challenge the prevailing narrative that neutrophils represent a therapeutic limitation in glucocorticoid treatment and suggest the cell survival effects previously documented may reflect selective gene expression patterns rather than overall drug insensitivity. For equine practitioners, this implies that neutrophil populations should respond meaningfully to glucocorticoid therapy in inflammatory conditions, supporting current clinical applications whilst refining expectations about the anti-inflammatory mechanisms at work.
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Practical Takeaways
- •Glucocorticoid therapy may be more effective at controlling inflammatory responses in equine patients than previously thought, as neutrophils respond robustly to these drugs
- •Consider neutrophil sensitivity when selecting corticosteroid doses for inflammatory conditions in horses—dosing based on older assumptions of neutrophil insensitivity may be excessive
- •Understanding the true responsiveness of neutrophils to glucocorticoids helps optimize anti-inflammatory protocols and may reduce unnecessary corticosteroid exposure
Key Findings
- •Equine neutrophils demonstrate comparable genomic sensitivity to glucocorticoids as other blood leukocytes, contrary to the prevailing assumption of relative insensitivity
- •Dexamethasone exerts potent anti-inflammatory effects on equine peripheral blood neutrophils
- •Direct comparative analysis of glucocorticoid effects across leukocyte types reveals neutrophils are not less responsive to genomic effects