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Buruli ulcer, a debilitating disease, is caused by Mycobacterium ulcerans. The incidence of this neglected tropical disease is steadily increasing. As a rule, without treatment, skin ulcers occur and a lengthy healing process may be observed associated with severe functional disabilities. Mouse models are already available to study establishment of lesions or evaluation of therapy but a lack of a suitable animal model, mimicking all clinical stages, in particular the healing process, remains an obstacle to understand the pathophysiology of M. ulcerans infection. M. ulcerans was s.c. inoculated in three consanguine mouse strains, that is, BALB/c and C57BL/6, classically used to study mycobacterial infection, and FVB/N. Strikingly, FVB/N mice, although as sensitive as all other mouse strains with respect to M. ulcerans infection, presented a spontaneous healing after the ulcerative phase despite stable bacterial load, and mycolactone toxin was not detected in the healed tissues. The spontaneous healing process was accompanied by an activation of the innate immune system. The adaptive response initiated by FVB/N mice was not involved in the healing process and did not confer protection against M. ulcerans. Our work highlights the importance of innate immune responses to control M. ulcerans infection. This in vivo model of M. ulcerans infection now paves the way for new avenues of research toward the elucidation of critical stages of this disease, such as the characterization of the regulation of mycolactone production, a better understanding of the pathophysiology of M. ulcerans infection, and the development of new therapeutic strategies.
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http://dx.doi.org/10.4049/jimmunol.1502194 | DOI Listing |
Access Microbiol
November 2024
Unit of Infectious Diseases, Ospedale Santa Chiara, APSS, Trento, Italy.
In the European region, diphtheria is now rarely suspected in patients presenting with upper respiratory tract symptoms. is the underestimated zoonosis that is replacing infections in industrialized countries, but extensive human and animal prevalence studies are lacking. The range of hosts that can act as reservoirs for is very broad, companion pets currently being the main source of human infection.
View Article and Find Full Text PDFPLoS Negl Trop Dis
December 2024
Department of Infectious Diseases and Microbiology, The Canberra Hospital, Australian Capital Territory, Australia.
We describe two locally acquired cases of Mycobacterium ulcerans infection (Buruli ulcer) in the town of Batemans Bay on the east coast of New South Wales (NSW), Australia, 150 km north of Eden, the only other place in NSW where Buruli ulcer has likely been locally acquired. Genomic analysis showed that the bacterial isolates from the cases were identical but belonged to a phylogenetically distinct M. ulcerans clade that was most closely related to the isolate from the earlier case in Eden to the south.
View Article and Find Full Text PDFSci Rep
November 2024
College of Medicine, Qatar University (QU) Health, Qatar University, Doha, Qatar.
Mycobacteria is a diverse genus that includes both innocuous environmental species and serious pathogens like Mycobacterium tuberculosis, Mycobacterium leprae, and Mycobacterium ulcerans, the causative agents of tuberculosis, leprosy, and Buruli ulcer, respectively. This study focuses on Mycobacterium marinum, a closely related species known for its larger genome and ability to infect ectothermic species and cooler human extremities. Utilizing whole-genome sequencing, we conducted a comprehensive pan-genome analysis of 100 M.
View Article and Find Full Text PDFPLoS Negl Trop Dis
November 2024
Melbourne Veterinary School, Department of Veterinary Biosciences, Faculty of Science, The University of Melbourne, Werribee, Victoria, Australia.
Sci Rep
October 2024
Department of Infectious Diseases, Barwon Health, Geelong, VIC, Australia.
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