title: The proteasome function is required for Mycobacterium leprae-induced apoptosis and cytokine secretion.
abstract: Previous studies have demonstrated the importance of the ubiquitin-proteasome pathway in the immune response to bacterial pathogens. To investigate the role of this system in the context of leprosy, Mycobacterium leprae-stimulated peripheral blood mononuclear cells (PBMC) were treated with the proteasome inhibitor MG132 to assess the levels of apoptosis and cytokine secretion. The results showed that the inhibition of proteasome activity significantly reduced M. leprae-mediated cell death. In addition, MG132 treatment led to a significant decrease in M. leprae-induced TNF-alpha and IL-10 secretion. Together, these results suggest that modulations of the ubiquitin-proteasome pathway may participate in the human response to M. leprae.
authors.affiliation: Leprosy Laboratory, Oswaldo Cruz Institute, FIOCRUZ, Rio de Janeiro, RJ, Brazil.
authors.forename: Tatiana O
authors.initials: TO
authors.lastname: Fulco
authors.forename: Ulisses G
authors.initials: UG
authors.lastname: Lopes
authors.forename: Euzenir N
authors.initials: EN
authors.lastname: Sarno
authors.forename: Elizabeth P
authors.initials: EP
authors.lastname: Sampaio
authors.forename: Alessandra M
authors.initials: AM
authors.lastname: Saliba
mesh_terms: D017209:Apoptosis; D016923:Cell Death / Q000187:drug effects; D015853:Cysteine Proteinase Inhibitors / Q000494:pharmacology*; D016207:Cytokines / Q000096:biosynthesis*; D006801:Humans; D016753:Interleukin-10 / Q000378:metabolism; D007918:Leprosy / Q000276:immunology; D007963:Leukocytes, Mononuclear / Q000187:drug effects; D007976:Leupeptins / Q000494:pharmacology*; D009166:Mycobacterium leprae / Q000378:metabolism* / Q000502:physiology; D046988:Proteasome Endopeptidase Complex / Q000187:drug effects / Q000378:metabolism*; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism
chemical_list: D015853:Cysteine Proteinase Inhibitors; D016207:Cytokines; D007976:Leupeptins; D014409:Tumor Necrosis Factor-alpha; D016753:Interleukin-10; D046988:Proteasome Endopeptidase Complex; C072553:benzyloxycarbonylleucyl-leucyl-leucine aldehyde