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- W2133240653 abstract "ABSTRACT Buruli ulcer is a chronic skin disease caused by Mycobacterium ulcerans , which produces a toxic lipid mycolactone. Despite the extensive necrosis and tissue damage, the lesions are painless. This absence of pain prevents patients from seeking early treatment and, as a result, many patients experience severe sequelae, including limb amputation. We have reported that mice inoculated with M. ulcerans show loss of pain sensation and nerve degeneration. However, the molecules responsible for the nerve damage have not been identified. In order to clarify whether mycolactone alone can induce nerve damage, mycolactone A/B was injected to footpads of BALB/c mice. A total of 100 μg of mycolactone induced footpad swelling, redness, and erosion. The von Frey sensory test showed hyperesthesia on day 7, recovery on day 21, and hypoesthesia on day 28. Histologically, the footpads showed epidermal erosion, moderate stromal edema, and moderate neutrophilic infiltration up to day 14, which gradually resolved. Nerve bundles showed intraneural hemorrhage, neutrophilic infiltration, and loss of Schwann cell nuclei on days 7 and 14. Ultrastructurally, vacuolar change of myelin started on day 14 and gradually subsided by day 42, but the density of myelinated fibers remained low. This study demonstrated that initial hyperesthesia is followed by sensory recovery and final hypoesthesia. Our present study suggests that mycolactone directly damages nerves and is responsible for the absence of pain characteristic of Buruli ulcer. Furthermore, mice injected with 200 μg of mycolactone showed pulmonary hemorrhage. This is the first study to demonstrate the systemic effects of mycolactone." @default.
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- W2133240653 date "2008-05-01" @default.
- W2133240653 modified "2023-10-16" @default.
- W2133240653 title "Mycolactone Is Responsible for the Painlessness of <i>Mycobacterium ulcerans</i> Infection (Buruli Ulcer) in a Murine Study" @default.
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- W2133240653 doi "https://doi.org/10.1128/iai.01588-07" @default.
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