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Burkholderia pseudomallei is a Gram-negative intracellular bacterium that causes the disease melioidosis. The disease can be fatal if left untreated or when antibiotic therapy is delayed and total clearance of the pathogen from the host is often not accomplished with current therapies. Thus, new therapeutic approaches for the treatment of infections caused by B. pseudomallei are required. To better understand host responses to B. pseudomallei infection, the activation of key proteins involved in the TLR inflammatory cascade was measured by western blotting. Activation of the mitogen-activated protein kinases (MAPKs) p38 and ERK were both significantly altered during both in vitro and in vivo infection. In considering an approach for therapy of B. pseudomallei infection the inhibition of ERK was achieved in vitro using the inhibitor PD0325901, along with decreased TNF-α production. However, the reduction in phosphorylated ERK and TNF-α release did not correspond with decreased bacterial replication or enhance clearance from infected macrophages. Despite this apparent lack of effect on the intracellular growth of B. pseudomallei in vitro, it is not clear what effect inhibition of ERK activation might have on outcome of disease in vivo. It may be that decreasing the levels of TNF-α in vivo could aid in reducing the overactive immune response that is known to ensue following B. pseudomallei infection, thereby increasing host survival.

european journal of clinical microbiology and infectious diseases

Mitogen-activated protein kinases (MAPKs) are modulated during in vitro and in vivo infection with the intracellular bacterium Burkholderia pseudomallei