Abstract
Cyclosporine and aspirin are routinely used in combination to treat immune-mediated hemolytic anemia (IMHA) in dogs. Cyclosporine is a potent immunosuppressive agent that targets T cell production of the cytokines IL-2 and IFN-γ. Low-dose aspirin is often used to inhibit platelet function in dogs with IMHA, since these animals are prone to life-threatening thromboembolic disease. In rodents and humans, aspirin and cyclosporine have both been shown to variably affect T cell cytokine production, and also numbers of circulating regulatory T cells (Tregs). In dogs, it has not yet been determined if concurrent aspirin alters the effects of cyclosporine on T-cell cytokine expression, or if either drug influences Treg numbers. In a crossover study, seven healthy young adult dogs were given either oral high-dose cyclosporine (10 mg/kg Q12 h), oral low-dose aspirin (1 mg/kg Q24 h), oral high-dose aspirin (10 mg/kg Q12 h), or combined low-dose aspirin with cyclosporine, each for 8 days, with a washout of at least 2 weeks after each treatment. Activated T cell cytokine expression (IL-2 & IFN-γ) and percent CD4 + CD25 + FOXP3+ Tregs were evaluated using flow cytometry, both prior to and on the last day of treatment. The difference between ...Continue Reading
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