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Anang V, Singh A, Kumar Rana A, Saraswati SSK, Bandyopadhyay U, Verma C, Chadha A, Natarajan K. Mycobacteria modulate SUMOylation to suppresses protective responses in dendritic cells. PLoS One 2023; 18:e0283448. [PMID: 37773921 PMCID: PMC10540951 DOI: 10.1371/journal.pone.0283448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Accepted: 03/07/2023] [Indexed: 10/01/2023] Open
Abstract
Post translational modifications (PTMs) are exploited by various pathogens in order to escape host immune responses. SUMOylation is one of the PTMs which is involved in regulation of a variety of cellular responses. However, the effects of host SUMOylation on pathogenic bacteria largely remain elusive. We, therefore, investigated the role of SUMOylation in regulating defense responses in dendritic cells (DCs) during mycobacterial infection. Dendritic Cells of female BALB/c mice and THP-1 macrophages were used. Western blotting was performed to measure the expression of level of SUMO1, pSTAT1, pp38, pERK, Beclin-1, LC3, Bax and Cytochrome C. For bacterial burden confocal microscopy and CFU (Colony Forming Unit) were used. Flow cytometry was used for ROS and co-stimulatory molecules measurement. Cytokine level were measured using ELISA. We show that stimulation of Bone Marrow Derived Dendritic Cells (BMDCs) with mycobacterial antigen Rv3416 or live infection with Mycobacterium bovis BCG increases the SUMOylation of host proteins. Inhibition of SUMOylation significantly decreased intracellular bacterial loads in DCs. Additionally, inhibiting SUMOylation, induces protective immune responses by increasing oxidative burst, pro-inflammatory cytokine expression and surface expression of T cell co-stimulatory molecules, and activation of pSTAT1 and Mitogen Activated Protein Kinases (MAPK) proteins- pp38 and pERK. SUMOylation inhibition also increased apoptosis and autophagy in BMDCs. Intriguingly, mycobacteria increased SUMOylation of many of the above molecules. Furthermore, inhibiting SUMOylation in DCs primed T cells that in turn attenuated bacterial burden in infected macrophages. These findings demonstrate that SUMOylation pathway is exploited by mycobacteria to thwart protective host immune responses.
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Affiliation(s)
- Vandana Anang
- Infectious Disease Immunology Lab, Dr. B.R. Ambedkar Center for Biomedical Research, University of Delhi, Delhi, India
| | - Aayushi Singh
- Infectious Disease Immunology Lab, Dr. B.R. Ambedkar Center for Biomedical Research, University of Delhi, Delhi, India
| | - Ankush Kumar Rana
- Infectious Disease Immunology Lab, Dr. B.R. Ambedkar Center for Biomedical Research, University of Delhi, Delhi, India
| | | | - Upasana Bandyopadhyay
- Infectious Disease Immunology Lab, Dr. B.R. Ambedkar Center for Biomedical Research, University of Delhi, Delhi, India
| | - Chaitenya Verma
- Infectious Disease Immunology Lab, Dr. B.R. Ambedkar Center for Biomedical Research, University of Delhi, Delhi, India
| | - Attinder Chadha
- Infectious Disease Immunology Lab, Dr. B.R. Ambedkar Center for Biomedical Research, University of Delhi, Delhi, India
| | - Krishnamurthy Natarajan
- Infectious Disease Immunology Lab, Dr. B.R. Ambedkar Center for Biomedical Research, University of Delhi, Delhi, India
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Singh A, Anang V, Verma C, Saraswati SSK, Rana AK, Bandyopadhyay U, Chadha A, Natarajan K. Bcl2 negatively regulates Protective Immune Responses During Mycobacterial Infection. Biomol Concepts 2021; 12:94-109. [PMID: 34304400 DOI: 10.1515/bmc-2021-0010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Accepted: 06/07/2021] [Indexed: 02/07/2023] Open
Abstract
We previously reported that M. tb on its own as well as together with HIV inhibits macrophage apoptosis by upregulating the expression of Bcl2 and Inhibitor of Apoptosis (IAP). In addition, recent reports from our lab showed that stimulation of either macrophages or BMDCs results in the significant upregulation of Bcl2. In this report, we delineate the role of Bcl2 in mediating defense responses from dendritic cells (BMDCs) during mycobacterial infection. Inhibiting Bcl2 led to a significant decrease in intracellular bacterial burden in BMDCs. To further characterize the role of Bcl2 in modulating defense responses, we inhibited Bcl2 in BMDCs as well as human PBMCs to monitor their activation and functional status in response to mycobacterial infection and stimulation with M. tb antigen Rv3416. Inhibiting Bcl2 generated protective responses including increased expression of co-stimulatory molecules, oxidative burst, pro-inflammatory cytokine expression and autophagy. Finally, co-culturing human PBMCs and BMDCs with antigen-primed T cells increased their proliferation, activation and effector function. These results point towards a critical role for Bcl2 in regulating BMDCs defense responses to mycobacterial infection.
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Affiliation(s)
- Aayushi Singh
- Infectious Disease Immunology Lab, Dr. B.R. Ambedkar Center for Biomedical Research, University of Delhi, Delhi 110007, India
| | - Vandana Anang
- Infectious Disease Immunology Lab, Dr. B.R. Ambedkar Center for Biomedical Research, University of Delhi, Delhi 110007, India
| | - Chaitenya Verma
- Infectious Disease Immunology Lab, Dr. B.R. Ambedkar Center for Biomedical Research, University of Delhi, Delhi 110007, India
| | | | - Ankush Kumar Rana
- Infectious Disease Immunology Lab, Dr. B.R. Ambedkar Center for Biomedical Research, University of Delhi, Delhi 110007, India
| | - Upasana Bandyopadhyay
- Infectious Disease Immunology Lab, Dr. B.R. Ambedkar Center for Biomedical Research, University of Delhi, Delhi 110007, India
| | - Attinder Chadha
- Infectious Disease Immunology Lab, Dr. B.R. Ambedkar Center for Biomedical Research, University of Delhi, Delhi 110007, India
| | - Krishnamurthy Natarajan
- Infectious Disease Immunology Lab, Dr. B.R. Ambedkar Center for Biomedical Research, University of Delhi, Delhi 110007, India
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Verma C, Ankush KR, Anang V, Tiwari BK, Singh A, Surender Kumar Saraswati S, Shariff M, Natarajan K. Calcium Dynamics Regulate Protective Responses and Growth of Staphylococcus aureus in Macrophages. Biomol Concepts 2020; 11:230-239. [PMID: 33726488 DOI: 10.1515/bmc-2020-0021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Staphylococcus aureus (S. aureus) is a gram-positive bacteria, which causes various fatal respiratory infections including pneumonia. The emergence of Methicillin-Resistance Staphylococcus aureus (MRSA) demands a thorough understanding of host-pathogen interactions. Here we report the role of calcium in regulating defence responses of S. aureus in macrophages. Regulating calcium fluxes in cells by different routes differentially governs the expression of T cell costimulatory molecule CD80 and Th1 promoting IL-12 receptor. Inhibiting calcium influx from extracellular medium increased expression of IFN-γ and IL-10 while blocking calcium release from the intracellular stores inhibited TGF-β levels. Blocking voltage-gated calcium channels (VGCC) inhibited the expression of multiple cytokines. While VGCC regulated the expression of apoptosis protein Bax, extracellular calcium-regulated the expression of Cytochrome-C. Similarly, VGCC regulated the expression of autophagy initiator Beclin-1. Blocking VGCC or calcium release from intracellular stores promoted phagosome-lysosome fusion, while activating VGCC inhibited phagosomelysosome fusion. Finally, calcium homeostasis regulated intracellular growth of Staphylococcus, although using different mechanisms. While blocking extracellular calcium influx seems to rely on IFN-γ and IL-12Rβ receptor mediated reduction in bacterial survival, blocking either intracellular calcium release or via VGCC route seem to rely on enhanced autophagy mediated reduction of intracellular bacterial survival. These results point to fine-tuning of defence responses by routes of calcium homeostasis.
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Affiliation(s)
- Chaitenya Verma
- Infectious Disease Immunology Lab, Dr. B.R. Ambedkar Center for Biomedical Research, University of Delhi, Delhi 110007, India.,Department of Pathology, Wexner Medical Center,The Ohio State University, OH-43210, USA
| | - Kumar Rana Ankush
- Infectious Disease Immunology Lab, Dr. B.R. Ambedkar Center for Biomedical Research, University of Delhi, Delhi 110007, India
| | - Vandana Anang
- Infectious Disease Immunology Lab, Dr. B.R. Ambedkar Center for Biomedical Research, University of Delhi, Delhi 110007, India
| | - Brijendra K Tiwari
- Infectious Disease Immunology Lab, Dr. B.R. Ambedkar Center for Biomedical Research, University of Delhi, Delhi 110007, India
| | - Aayushi Singh
- Infectious Disease Immunology Lab, Dr. B.R. Ambedkar Center for Biomedical Research, University of Delhi, Delhi 110007, India
| | | | - Malini Shariff
- Department of Microbiology, Vallabhbhai Patel Chest Institute, University of Delhi, Delhi 110007, India
| | - Krishnamurthy Natarajan
- Infectious Disease Immunology Lab, Dr. B.R. Ambedkar Center for Biomedical Research, University of Delhi, Delhi 110007, India
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Singh A, Anang V, Kumar Rana A, Verma C, Surender Kumar Saraswati S, Kumari P, Singh A, Natarajan K. Deciphering the role of calcium homeostasis in T cells functions during mycobacterial infection. Cell Immunol 2020; 357:104198. [DOI: 10.1016/j.cellimm.2020.104198] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Revised: 07/27/2020] [Accepted: 07/27/2020] [Indexed: 01/11/2023]
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Emerging Bordetella pertussis Strains Induce Enhanced Signaling of Human Pattern Recognition Receptors TLR2, NOD2 and Secretion of IL-10 by Dendritic Cells. PLoS One 2017; 12:e0170027. [PMID: 28076445 PMCID: PMC5226795 DOI: 10.1371/journal.pone.0170027] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Accepted: 12/26/2016] [Indexed: 01/04/2023] Open
Abstract
Vaccines against pertussis have been available for more than 60 years. Nonetheless, this highly contagious disease is reemerging even in countries with high vaccination coverage. Genetic changes of Bordetella pertussis over time have been suggested to contribute to the resurgence of pertussis, as these changes may favor escape from vaccine-induced immunity. Nonetheless, studies on the effects of these bacterial changes on the immune response are limited. Here, we characterize innate immune recognition and activation by a collection of genetically diverse B. pertussis strains isolated from Dutch pertussis patients before and after the introduction of the pertussis vaccines. For this purpose, we used HEK-Blue cells transfected with human pattern recognition receptors TLR2, TLR4, NOD2 and NOD1 as a high throughput system for screening innate immune recognition of more than 90 bacterial strains. Physiologically relevant human monocyte derived dendritic cells (moDC), purified from peripheral blood of healthy donors were also used. Findings indicate that, in addition to inducing TLR2 and TLR4 signaling, all B. pertussis strains activate the NOD-like receptor NOD2 but not NOD1. Furthermore, we observed a significant increase in TLR2 and NOD2, but not TLR4, activation by strains circulating after the introduction of pertussis vaccines. When using moDC, we observed that the recently circulating strains induced increased activation of these cells with a dominant IL-10 production. In addition, we observed an increased expression of surface markers including the regulatory molecule PD-L1. Expression of PD-L1 was decreased upon blocking TLR2. These in vitro findings suggest that emerging B. pertussis strains have evolved to dampen the vaccine-induced inflammatory response, which would benefit survival and transmission of this pathogen. Understanding how this disease has resurged in a highly vaccinated population is crucial for the design of improved vaccines against pertussis.
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Sharma D, Tiwari BK, Mehto S, Antony C, Kak G, Singh Y, Natarajan K. Suppression of Protective Responses upon Activation of L-Type Voltage Gated Calcium Channel in Macrophages during Mycobacterium bovis BCG Infection. PLoS One 2016; 11:e0163845. [PMID: 27723836 PMCID: PMC5056721 DOI: 10.1371/journal.pone.0163845] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Accepted: 09/15/2016] [Indexed: 12/22/2022] Open
Abstract
The prevalence of Mycobacterium tuberculosis (M. tb) strains eliciting drug resistance has necessitated the need for understanding the complexities of host pathogen interactions. The regulation of calcium homeostasis by Voltage Gated Calcium Channel (VGCCs) upon M. tb infection has recently assumed importance in this area. We previously showed a suppressor role of VGCC during M. tb infections and recently reported the mechanisms of its regulation by M. tb. Here in this report, we further characterize the role of VGCC in mediating defence responses of macrophages during mycobacterial infection. We report that activation of VGCC during infection synergistically downmodulates the generation of oxidative burst (ROS) by macrophages. This attenuation of ROS is regulated in a manner which is dependent on Toll like Receptor (TLR) and also on the route of calcium influx, Protein Kinase C (PKC) and by Mitogen Activation Protein Kinase (MAPK) pathways. VGCC activation during infection increases cell survival and downmodulates autophagy. Concomitantly, pro-inflammatory responses such as IL-12 and IFN-γ secretion and the levels of their receptors on cell surface are inhibited. Finally, the ability of phagosomes to fuse with lysosomes in M. bovis BCG and M. tb H37Rv infected macrophages is also compromised when VGCC activation occurs during infection. The results point towards a well-orchestrated strategy adopted by mycobacteria to supress protective responses mounted by the host. This begins with the increase in the surface levels of VGCCs by mycobacteria and their antigens by well-controlled and regulated mechanisms. Subsequent activation of the upregulated VGCC following tweaking of calcium levels by molecular sensors in turn mediates suppressor responses and prepare the macrophages for long term persistent infection.
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Affiliation(s)
- Deepika Sharma
- Infectious Disease Immunology Lab, Dr. B R Ambedkar Centre for Biomedical Research, University of Delhi, Delhi, India
| | - Brijendra Kumar Tiwari
- Infectious Disease Immunology Lab, Dr. B R Ambedkar Centre for Biomedical Research, University of Delhi, Delhi, India
| | - Subhash Mehto
- Infectious Disease Immunology Lab, Dr. B R Ambedkar Centre for Biomedical Research, University of Delhi, Delhi, India
| | - Cecil Antony
- Infectious Disease Immunology Lab, Dr. B R Ambedkar Centre for Biomedical Research, University of Delhi, Delhi, India
| | - Gunjan Kak
- Infectious Disease Immunology Lab, Dr. B R Ambedkar Centre for Biomedical Research, University of Delhi, Delhi, India
| | - Yogendra Singh
- Department of Zoology, University of Delhi, Delhi, India
| | - Krishnamurthy Natarajan
- Infectious Disease Immunology Lab, Dr. B R Ambedkar Centre for Biomedical Research, University of Delhi, Delhi, India
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