Abstract
Nebulized lidocaine enables dosages of oral corticosteroids to be tapered in the treatment of severe asthma. We sought to investigate the effect of lidocaine on T cells from patients with allergic asthma. PBMCs and CD4(+) T cells were isolated from 6 patients with asthma and house dust mite allergy. PBMCs were cultured with lidocaine for up to 7 days and then stained with propidium iodide to evaluate the involvement of apoptosis. In addition, the viability of CD4(+) T cells when cultured with lidocaine was investigated. Effects of lidocaine on proliferative response, mRNA expression, and protein production of IL-5 and IFN-gamma by PBMCs were investigated after stimulation with Dermatophagoides farinae, purified protein derivative, and phorbol 12-myristate 13-acetate plus calcium ionophore. The effects of lidocaine on the proliferative response of steroid-insensitive PBMCs from 6 nonallergic donors induced by preculture with IL-2 and IL-4 were also investigated. No significant increase in the staining of PBMCs with propidium iodide was observed in the presence of 100 micromol/L lidocaine. The viability of CD4(+) T cells was not significantly affected by culture with lidocaine at this concentration. However, lidocaine inhibited, ...Continue Reading
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