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Detection Of ER Stress After Infection Of Human Macrophages By Mycobacterium Tuberculosis | 71875
ISSN: 2332-0877
Journal of Infectious Diseases & Therapy
Open Access
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Statement of the Problem: Post infection, macrophages, the first cells in the lungs that propel defence against pathogen
invasion and play crucial activity in the onset and maintenance of immune responses against Mtb. The macrophages play
this crucial defence role by phagocytosis which have the macrophages ��?��?eat��?��? up the Mtb bacilli. Macrophages therefore become
infected with mycobacteria and may undergo apoptosis (programmed cell death) to destroy pathogens and prevent further
spreading. Apoptosis which results in the elimination of Mtb can be triggered by endoplasmic reticulum (ER) stress which is the
physiological or pathological processes that disturb protein folding in the endoplasmic reticulum caused by the phagocytosis of
the Mtb bacilli by the macrophages. The dysregulation of ER homeostasis can cause chronic diseases in humans and it is crucial
to study ER stress using mammalian cells to understand ER-stress related diseases such as Tuberculosis. Here, we studied the
ER stress induction and the extent of ER stress induction using human monocytes derived macrophages (hMDMs). We used
the ER stress inducers tunicamycin and thapsigargin, and also infecting the macrophages with different doses of Mtb and
analyzing CHOP and ATF6-alpha expression by western blot. This indicated that both inducers triggered CHOP activation,
that a low dose of Mtb suppressed the expression of these ER-stress markers in most donors, and that infection with a higher
dose of Mtb stimulated expression of both markers in 4 out of 6 donors. Alternatively, live microscopy was also performed on
raw macrophages and 16HBE epithelial cells after transfection with the ER stress plasmid sensor pEGFP-XBP1dDBD-STOPtagRFPt
and stimulation with tunicamycin and purified protein derivative of tuberculin (PPD). We have here confirmed the
detection of ER-stress in human monocyte derived macrophages using positive inducers, and shown that low doses of Mtb
decreases induction of ER-strress whereas high dose of Mtb induces ER-stress.
Biography
Samuel Inkabi holds an MSc Medical Biology from Linkoping University, Sweden. He also holds a Bachelor’s in Biochemistry from Kwame Nkrumah University of Science and Technology, Ghana. His research focuses on infectious diseases, cancer and avian genetics. He has co-authored a publication and authored a review paper in reputed journals.
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