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2015 ; 83
(9
): 3534-44
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Lack of the Transcription Factor Hypoxia-Inducible Factor 1? (HIF-1?) in
Macrophages Accelerates the Necrosis of Mycobacterium avium-Induced Granulomas
#MMPMID26099585
Cardoso MS
; Silva TM
; Resende M
; Appelberg R
; Borges M
Infect Immun
2015[Sep]; 83
(9
): 3534-44
PMID26099585
show ga
The establishment of mycobacterial infection is characterized by the formation of
granulomas, which are well-organized aggregates of immune cells, namely, infected
macrophages. The granuloma's main function is to constrain and prevent
dissemination of the mycobacteria while focusing the immune response to a limited
area. In some cases these lesions can grow progressively into large granulomas
which can undergo central necrosis, thereby leading to their caseation.
Macrophages are the most abundant cells present in the granuloma and are known to
adapt under hypoxic conditions in order to avoid cell death. Our laboratory has
developed a granuloma necrosis model that mimics the human pathology of
Mycobacterium tuberculosis, using C57BL/6 mice infected intravenously with a low
dose of a highly virulent strain of Mycobacterium avium. In this work, a mouse
strain deleted of the hypoxia inducible factor 1? (HIF-1?) under the Cre-lox
system regulated by the lysozyme M gene promoter was used to determine the
relevance of HIF-1? in the caseation of granulomas. The genetic ablation of
HIF-1? in the myeloid lineage causes the earlier emergence of granuloma necrosis
and clearly induces an impairment of the resistance against M. avium infection
coincident with the emergence of necrosis. The data provide evidence that
granulomas become hypoxic before undergoing necrosis through the analysis of
vascularization and quantification of HIF-1? in a necrotizing mouse model. Our
results show that interfering with macrophage adaptation to hypoxia, such as
through HIF-1? inactivation, accelerates granuloma necrosis.