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Arumugam P, Chauhan M, Rajeev T, Chakraborty R, Bisht K, Madan M, Shankaran D, Ramalingam S, Gandotra S, Rao V. The mitochondrial gene-CMPK2 functions as a rheostat for macrophage homeostasis. Front Immunol 2022; 13:935710. [PMID: 36451821 PMCID: PMC9702992 DOI: 10.3389/fimmu.2022.935710] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Accepted: 10/21/2022] [Indexed: 09/04/2024] Open
Abstract
In addition to their role in cellular energy production, mitochondria are increasingly recognized as regulators of the innate immune response of phagocytes. Here, we demonstrate that altering expression levels of the mitochondria-associated enzyme, cytidine monophosphate kinase 2 (CMPK2), disrupts mitochondrial physiology and significantly deregulates the resting immune homeostasis of macrophages. Both CMPK2 silenced and constitutively overexpressing macrophage lines portray mitochondrial stress with marked depolarization of their membrane potential, enhanced reactive oxygen species (ROS), and disturbed architecture culminating in the enhanced expression of the pro-inflammatory genes IL1β, TNFα, and IL8. Interestingly, the long-term modulation of CMPK2 expression resulted in an increased glycolytic flux of macrophages akin to the altered physiological state of activated M1 macrophages. While infection-induced inflammation for restricting pathogens is regulated, our observation of a total dysregulation of basal inflammation by bidirectional alteration of CMPK2 expression only highlights the critical role of this gene in mitochondria-mediated control of inflammation.
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Affiliation(s)
- Prabhakar Arumugam
- Immunology and Infectious Disease Unit, Council of Scientific and Industrial Research (CSIR)- Institute of Genomics and Integrative Biology, New Delhi, India
- Academy of Scientific and Innovative Research (AcSIR), Council of Scientific and Industrial Research (CSIR)- Human Resource Development Centre, Ghaziabad, India
| | - Meghna Chauhan
- Immunology and Infectious Disease Unit, Council of Scientific and Industrial Research (CSIR)- Institute of Genomics and Integrative Biology, New Delhi, India
- Academy of Scientific and Innovative Research (AcSIR), Council of Scientific and Industrial Research (CSIR)- Human Resource Development Centre, Ghaziabad, India
| | - Thejaswitha Rajeev
- Immunology and Infectious Disease Unit, Council of Scientific and Industrial Research (CSIR)- Institute of Genomics and Integrative Biology, New Delhi, India
| | - Rahul Chakraborty
- Immunology and Infectious Disease Unit, Council of Scientific and Industrial Research (CSIR)- Institute of Genomics and Integrative Biology, New Delhi, India
- Academy of Scientific and Innovative Research (AcSIR), Council of Scientific and Industrial Research (CSIR)- Human Resource Development Centre, Ghaziabad, India
| | - Kanika Bisht
- Immunology and Infectious Disease Unit, Council of Scientific and Industrial Research (CSIR)- Institute of Genomics and Integrative Biology, New Delhi, India
- Academy of Scientific and Innovative Research (AcSIR), Council of Scientific and Industrial Research (CSIR)- Human Resource Development Centre, Ghaziabad, India
| | - Mahima Madan
- Immunology and Infectious Disease Unit, Council of Scientific and Industrial Research (CSIR)- Institute of Genomics and Integrative Biology, New Delhi, India
- Academy of Scientific and Innovative Research (AcSIR), Council of Scientific and Industrial Research (CSIR)- Human Resource Development Centre, Ghaziabad, India
| | - Deepthi Shankaran
- Immunology and Infectious Disease Unit, Council of Scientific and Industrial Research (CSIR)- Institute of Genomics and Integrative Biology, New Delhi, India
- Academy of Scientific and Innovative Research (AcSIR), Council of Scientific and Industrial Research (CSIR)- Human Resource Development Centre, Ghaziabad, India
| | - Sivaprakash Ramalingam
- Immunology and Infectious Disease Unit, Council of Scientific and Industrial Research (CSIR)- Institute of Genomics and Integrative Biology, New Delhi, India
- Genomics and Molecular Medicine, Council of Scientific and Industrial Research (CSIR)- Institute of Genomics and Integrative Biology, New Delhi, India
| | - Sheetal Gandotra
- Immunology and Infectious Disease Unit, Council of Scientific and Industrial Research (CSIR)- Institute of Genomics and Integrative Biology, New Delhi, India
- Academy of Scientific and Innovative Research (AcSIR), Council of Scientific and Industrial Research (CSIR)- Human Resource Development Centre, Ghaziabad, India
| | - Vivek Rao
- Immunology and Infectious Disease Unit, Council of Scientific and Industrial Research (CSIR)- Institute of Genomics and Integrative Biology, New Delhi, India
- Academy of Scientific and Innovative Research (AcSIR), Council of Scientific and Industrial Research (CSIR)- Human Resource Development Centre, Ghaziabad, India
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