P-glycoprotein function in peripheral T lymphocyte subsets of myasthenia gravis patients: clinical implications and influence of glucocorticoid administration.
Int Immunopharmacol
; 9(3): 284-90, 2009 Mar.
Article
em En
| MEDLINE
| ID: mdl-19101657
ABSTRACT
Myasthenia gravis (MG) is an autoimmune neuromuscular disorder with a chronic clinical course that requires long-term glucocorticoid (GC) therapy. A drug efflux pump, P-glycoprotein (P-gp), actively transports GC out of target cells, thereby reducing its efficacy. We evaluated the P-gp function of peripheral-blood mononuclear cells in 59 MG patients. P-gp function was estimated from a decrease in fluorescent P-gp substrate Rhodamine 123 and its inhibition by the conformation-sensitive UIC2 monoclonal antibody. P-gp function on CD8(+) T cells in 21 MG patients having experienced GC therapy was higher than that in 19 MG patients having no history of GC therapy (p=0.026). There was a significant correlation between P-gp function in CD3(+) (r=0.55, p=0.014) or CD4(+) (r=0.48, p=0.034) T cells and the total dose of prednisolone for treatment. P-gp function on CD4(+) T cells in MG patients who showed low responses to prednisolone therapy (n=8) was higher than that in patients who showed relatively high responses to prednisolone therapy (n=10) (p=0.045). These results suggest that higher P-glycoprotein activity on CD3(+) or CD4(+) cells necessitated treatment with higher steroid doses in order to achieve a clinical response. The measurement of P-gp function on CD4(+) T cells is useful in the assessment of clinical response to GC therapy.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Prednisolona
/
Linfócitos T CD4-Positivos
/
Subpopulações de Linfócitos T
/
Membro 1 da Subfamília B de Cassetes de Ligação de ATP
/
Linfócitos T CD8-Positivos
/
Glucocorticoides
/
Miastenia Gravis
Limite:
Adult
/
Aged
/
Female
/
Humans
/
Male
/
Middle aged
Idioma:
En
Revista:
Int Immunopharmacol
Ano de publicação:
2009
Tipo de documento:
Article