{"id":944,"date":"2026-03-05T19:29:26","date_gmt":"2026-03-05T19:29:26","guid":{"rendered":"http:\/\/wmtc2006.com\/?p=944"},"modified":"2026-03-05T19:29:26","modified_gmt":"2026-03-05T19:29:26","slug":"structural-integrity-of-mycolactone-following-diffusion-into-internal-organs","status":"publish","type":"post","link":"https:\/\/wmtc2006.com\/?p=944","title":{"rendered":"\ufeffStructural integrity of mycolactone following diffusion into internal organs"},"content":{"rendered":"

\ufeffStructural integrity of mycolactone following diffusion into internal organs. spleen several weeks before ulcerative lesions appear. Importantly, diffusion of mycolactone into the blood ofM. ulceransinfected mice coincided with alterations in the functions of circulating lymphocytes. == Conclusion == In addition to providing the first evidence that mycolactone diffuses beyond the site ofM. ulceransinfection, our results support the hypothesis that the toxin exerts immunosuppressive effects at the systemic level. Furthermore, they suggest that assays based on mycolactone detection in circulating blood cells may be considered for diagnostic tests of early disease. == Author Summary == Mycolactone is a lipophilic molecule produced byMycobacterium ulcerans, the causative agent of the skin disease Buruli ulcer (BU). Mycolactone displays unique cytocidal and immunosuppressive properties that are reflected locally by massive tissue necrosis and minimal inflammation. Here we investigated whether mycolactone diffuses from infected tissues and exerts immunosuppressive properties at the systemic level. We used both a radiolabeled form of the toxin and a direct LC-MS\/MS analysis of lipid extracts from internal organs and cell subpopulations to investigate the pharmacodistribution of mycolactonein vivo. Using a Biricodar dicitrate (VX-710 dicitrate) mouse model of subcutaneous infection withM. ulcerans, we show that mycolactone distributes far beyond the sphere of its cytocidal action. The toxin diffused from infected tissues into the blood and the spleen, where it concentrated in mononuclear cell subsets. Importantly, mycolactone was detected in circulating blood several weeks before ulcerative lesions develop. The presence of mycolactone in blood cells was associated with a decreased capacity of circulating lymphocytes to produce interleukin-2 upon stimulation. In addition to providing the first evidence that mycolactone targets key immune cell populations in infected hosts, this work suggests that mycolactone detection in peripheral blood cells may form the basis of diagnostic tests of early disease. == Introduction == Buruli ulcer (BU) is a cutaneous disease caused byMycobacterium ulcerans, leading to the formation of progressive ulcers, with extensive skin and soft tissue destruction. The presence of a coagulative necrosis forming a nidus for colonies of bacilli, accompanied by minimal inflammation, are considered the most reliable features for the histopathological diagnosis of BU disease[1]. These hallmarks of BU lesions in fact reflect the dual properties of a macrolide toxin produced byM. ulcerans, mycolactone, which plays a critical role in bacterial virulence[2],[3]. This unique polyketide has been shown to be a potent cytocidal moleculein vitroandin vivo[4],[5],[6],[7]. In addition, mycolactone displays significant immunosuppressive properties at non-cytotoxic doses towards a wide range of immune cells[5],[8],[9],[10]. Numerous studies have reported defective IFN- Biricodar dicitrate (VX-710 dicitrate) responses in BU patients, using assays of PBMC Biricodar dicitrate (VX-710 dicitrate) restimulationex-vivo[11],[12],[13],[14],[15],[16]. IFN- responses toM. ulceransantigens are reduced in BU patients compared to healthy controls[11],[12],[13],[14], particularly during the early stage of the disease[15],[16].M. ulceransinfection-associated reduction of IFN- responses was initially thought to be restricted to mycobacterial antigens. In fact, systemic suppression of IFN- responses is not antigen-specific, and resolves after surgical excision of the lesion[17]. Notably, the optimal growth temperature ofM. ulceransis below 35C[18], and animal studies suggest that the bacilli remain essentially localized within ulcerative lesions in subcutaneous tissues[5]. The fact that immunosuppression in BU patients resolves after removal of infected tissues therefore strongly suggests that bacterial factors, such as mycolactone, may diffuse from the bacilli colonies and exert immunosuppressive results on the systemic level[19]. In today’s study, we’ve looked into the pharmacodistribution of Ras-GRF2<\/a> mycolactone pursuing injection in pet versions by tracing a radiolabeled type of the toxinin vivo, and by straight evaluating the integrity and the number of mycolactone in lipid ingredients from organs and cell subpopulations. Our observation that mycolactone diffuses in bloodstream and spleen, and concentrates within distinctive immune system cellular subsets, works with the idea that mycolactone permitsM. ulceransto establish long-term attacks simply by neutralizing the introduction of cellular immunity remotely. == Strategies == == Pets == Six Biricodar dicitrate (VX-710 dicitrate)<\/a> week previous BalB\/cByJIco and C57BL\/6JIco feminine.<\/p>\n","protected":false},"excerpt":{"rendered":"

\ufeffStructural integrity of mycolactone following diffusion into internal organs. spleen several weeks before ulcerative lesions appear. 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