The Cording Phenotype of Mycobacterium tuberculosis Induces the Formation of Extracellular Traps in Human Macrophages

Kalsum, SadafLinköpings universitet,Avdelningen för mikrobiologi och molekylär medicin,Medicinska fakulteten (author)

Funding Agencies|Swedish Research Council [2012-3349, 2015-02593]; Swedish Heart Lung Foundation [20130685, 20150709]
The causative agent of tuberculosis, Mycobacterium tuberculosis, shares several characteristics with organisms that produce biofilms during infections. One of these is the ability to form tight bundles also known as cords. However, little is known of the physiological relevance of the cording phenotype. In this study, we investigated whether cord-forming M. tuberculosis induce the formation of macrophage extracellular traps (METs) in human monocyte-derived macrophages. Macrophages have previously been shown to produce extracellular traps in response to various stimuli. We optimized bacterial culturing conditions that favored the formation of the cord-forming phenotype as verified by scanning electron microscopy. Microscopy analysis of METs formation during experimental infection of macrophages with M. tuberculosis revealed that cord-forming M. tuberculosis induced significantly more METs compared to the non-cording phenotype. Deletion of early secreted antigenic target-6 which is an important virulence factor of M. tuberculosis, abrogated the ability of the bacteria to induce METs. The release of extracellular DNA from host cells during infection may represent a defense mechanism against pathogens that are difficult to internalize, including cord-forming M. tuberculosis.

Braian, ClaraLinköpings universitet,Avdelningen för mikrobiologi och molekylär medicin,Medicinska fakulteten(Swepub:liu)claho27 (author)
Koeken, Valerie A. C. M.Linköpings universitet,Avdelningen för mikrobiologi och molekylär medicin,Medicinska fakulteten,Radboud University of Nijmegen, Netherlands (author)
Raffetseder, JohannaLinköpings universitet,Avdelningen för neuro- och inflammationsvetenskap,Medicinska fakulteten(Swepub:liu)johra57 (author)
Lindroth, MargarethaLinköpings universitet,Avdelningen för mikrobiologi och molekylär medicin,Medicinska fakulteten(Swepub:liu)marli32 (author)
van Crevel, ReinoutRadboud University of Nijmegen, Netherlands (author)
Lerm, MariaLinköpings universitet,Avdelningen för mikrobiologi och molekylär medicin,Medicinska fakulteten(Swepub:liu)marle69 (author)
Linköpings universitetAvdelningen för mikrobiologi och molekylär medicin (creator_code:org_t)

In:Frontiers in Cellular and Infection Microbiology: FRONTIERS MEDIA SA72235-2988

By the author/editor: Kalsum, Sadaf; Braian, Clara; Koeken, Valerie ...; Raffetseder, Joh ...; Lindroth, Margar ...; van Crevel, Rein ...; show more...; Lerm, Maria; show less...

About the subject

MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Basic Medicine; and Microbiology in ...

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