Ion Channel and Ubiquitin Differential Expression during Erythromycin-Induced Anhidrosis in Foals.
Authors: Patterson Rosa Laura, Mallicote Martha F, MacKay Robert J, Brooks Samantha A
Journal: Animals : an open access journal from MDPI
Summary
# Editorial Summary Erythromycin is the standard treatment for *Rhodococcus equi* in foals, yet the drug frequently triggers temporary anhidrosis—a potentially life-threatening side-effect in young animals unable to thermoregulate effectively. Using skin biopsies and quantitative intradermal terbutaline sweat tests (QITSTs) on six healthy pony-cross foals at three time points (baseline, during anhidrosis, and post-recovery), Rosa et al. performed RNA sequencing to identify molecular changes associated with erythromycin-induced loss of sweating. Differential gene expression analysis revealed 132 significantly altered transcripts during the anhidrotic phase, with gene ontology clustering pointing to two primary mechanisms: ubiquitin-mediated protein degradation and ion channel regulation—both critical for normal sweat gland function. Notably, these same pathways have been previously identified in heritable equine idiopathic anhidrosis, suggesting erythromycin may hijack fundamental cellular machinery governing sweating rather than causing simple drug toxicity. Whilst the temporary nature of macrolide-induced anhidrosis differs from the permanent condition in some horses, understanding these shared molecular pathways could eventually inform both better management strategies during treatment and improved understanding of why certain animals are predisposed to anhidrosis long-term.
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Practical Takeaways
- •Erythromycin-induced anhidrosis in foals involves specific genetic/molecular pathways affecting sweat gland function that may be reversible, warranting careful monitoring during treatment for Rhodococcus equi
- •Understanding the ion-channel and ubiquitin dysregulation mechanisms could help veterinarians develop targeted interventions or management strategies for foals experiencing macrolide-related anhidrosis
- •The molecular overlap between temporary (drug-induced) and heritable anhidrosis suggests potential therapeutic targets that warrant further investigation
Key Findings
- •132 gene transcripts were significantly differentially expressed during erythromycin-induced anhidrosis after Bonferroni correction
- •Gene ontology analysis identified over-represented biological functions for ubiquitination and ion-channel function during anhidrotic episodes
- •The same molecular mechanisms (ubiquitination and ion-channel dysfunction) previously implicated in heritable equine idiopathic anhidrosis were identified in macrolide-induced temporary anhidrosis