Pharmacodynamic monitoring of canine T-cell cytokine responses to oral cyclosporine.
J Vet Intern Med
; 25(6): 1391-7, 2011.
Article
em En
| MEDLINE
| ID: mdl-22092633
ABSTRACT
BACKGROUND:
Pharmacodynamic assays measure the immunosuppressive effects of cyclosporine on T-cells and offer an alternative assessment of efficacy in individual patients.OBJECTIVE:
To assess the immunosuppressive effects of high and low dosage cyclosporine on canine T-cells and to develop a novel testing system for individualized dose adjustment. ANIMALS Seven healthy female Walker hounds.METHODS:
Experimental study using a paired comparison design. Flow cytometry was used to measure T-cell expression of IL-2, IL-4, and IFN-γ. Cytokine expression 8 days after oral administration of high and low dosages of cyclosporine was compared to baseline and washout values, respectively. The high dosage was initially 10 mg/kg q12h and was then adjusted to attain established immunosuppressive trough blood drug concentrations (>600 ng/mL). The low dosage was 5 mg/kg q24h.RESULTS:
High dosage cyclosporine resulted in significant decreases in IL-2 and IFN-γ expression (P = .0156, P = .0156), but not IL-4 expression (P = .2188). Low dosage cyclosporine was associated with a significant decrease in IFN-γ expression (P = .0156), while IL-2 expression was not affected (P = .1094). CONCLUSIONS AND CLINICAL IMPORTANCE T-cell function is suppressed at trough blood drug concentrations exceeding 600 ng/mL, and is at least partially suppressed in some dogs at low dosages. Direct evaluation of T-cell function could be an effective, more sensitive alternative to measuring blood drug concentrations for monitoring immunosuppressive therapy.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Linfócitos T
/
Interferon gama
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Interleucina-2
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Ciclosporina
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Imunossupressores
Limite:
Animals
Idioma:
En
Ano de publicação:
2011
Tipo de documento:
Article