Abstract:
:Mycobacterium avium subsp. paratuberculosis (MAP) has long been implicated as a triggering agent in Crohn's disease (CD). In this study, we investigated the growth/persistence of both M. avium subsp. hominissuis (MAH) and MAP, in macrophages from healthy controls (HC), CD and ulcerative colitis patients. For viability assessment, both CFU counts and a pre16SrRNA RNA/DNA ratio assay (for MAP) were used. Phagolysosome fusion was evaluated by immunofluorescence, through analysis of LAMP-1 colocalization with MAP. IBD macrophages were more permissive to MAP survival than HC macrophages (a finding not evident with MAH), but did not support MAP active growth. The lower MAP CFU counts in macrophage cultures associated with Infliximab treatment were not due to increased killing, but possibly to elevation in the proportion of intracellular dormant non-culturable MAP forms, as MAP showed higher viability in those macrophages. Increased MAP viability was not related to lack of phagolysosome maturation. The predominant induction of MAP dormant forms by Infliximab treatment may explain the lack of MAP reactivation during anti-TNF therapy of CD but does not exclude the possibility of MAP recrudescence after termination of therapy.
journal_name
Med Microbiol Immunoljournal_title
Medical microbiology and immunologyauthors
Nazareth N,Magro F,Appelberg R,Silva J,Gracio D,Coelho R,Cabral JM,Abreu C,Macedo G,Bull TJ,Sarmento Adoi
10.1007/s00430-015-0393-2subject
Has Abstractpub_date
2015-12-01 00:00:00pages
647-56issue
6eissn
0300-8584issn
1432-1831pii
10.1007/s00430-015-0393-2journal_volume
204pub_type
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journal_title:Medical microbiology and immunology
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journal_title:Medical microbiology and immunology
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