Abstract
Objective
Present study investigates the effect of Xylocarpus moluccensis (Lamk.) M. Roem fruit fraction (CDR) on endotoxemia and explores the underlying mechanisms.
Materials and methods
The effect of CDR (1–100 µg/ml) was assessed on cytokines, MAPKs, ROS, and metabolic reprogramming in LPS-induced cells (J774.2 and THP-1) by the conventional methodology of ELISA, PCR, and Western blotting. The effect of CDR (1–50 mg/kg, p.o.) was also evaluated in the mice model of endotoxemia and sepsis.
Results
CDR prevents LPS-induced cytokine production from murine and human whole blood and cell lines. CDR suppressed total cellular and mitochondrial superoxide generation and preserved mitochondrial function in LPS-stimulated phagocytes. Additionally, CDR abrogated LPS-induced MAPK’s phosphorylation and IκBα degradation in J774.2 cells. Moreover, CDR suppressed LPS-induced glycolytic flux as indicated from PKM2, HK-2, PDK-2, and HIF-1α expression in J774.2 cells. In vivo, CDR pre-treatment inhibited pro-inflammatory cytokines release, metabolic reprogramming from oxidative phosphorylation to glycolysis in both LPS-induced endotoxemia and cecal slurry-induced sepsis mice model.
Conclusion
Present study demonstrates the protective effect of CDR on LPS-induced inflammation and sepsis and identifies MAPK-NFκB and ROS-HIF1α-PKM2 as the putative target axis.
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Availability of data and materials
The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- LPS:
-
Lipopolysaccharide
- TLRs:
-
Toll-like receptors
- TNF-α:
-
Tumour necrosis factor alpha
- IL-6:
-
Interleukin 6
- IL-1β:
-
Interleukin 1 beta
- NLRP3:
-
NLR family pyrin domain containing 3
- IL-4:
-
Interleukin 4
- IL-10:
-
Interleukin 10
- MAPK:
-
Mitogen-activated protein kinase
- ERK1/2:
-
Extracellular signal-regulated kinases 1/2
- JNK1/2:
-
C-Jun N-terminal kinase 1/2
- IκBα:
-
Inhibitor of kappa B
- PKM2:
-
Pyruvate kinase muscle isozyme M2
- HK-2:
-
Hexokinase-2
- PDK-2:
-
Pyruvate dehydrogenase kinase 2
- HIF-1α:
-
Hypoxia-inducible factor-1alpha
- iNOS:
-
Inducible nitric oxide synthase
- Arg-1:
-
Arginase-1
- PAMP:
-
Pathogen-associated molecular pattern
- ROS:
-
Reactive oxygen species
- OXPHOS:
-
Oxidative phosphorylation
- CNS:
-
Central nervous system
- CDRI:
-
Central Drug Research Institute
- RPMI:
-
Roswell Park Memorial Institute
- DMEM:
-
Dulbecco's modified Eagle medium
- PMs:
-
Peritoneal macrophages
- i.p.:
-
Intraperitoneal
- FBS:
-
Fetal bovine serum
- PI:
-
Protease Inhibitor
- DHE:
-
Dihydroethidium
- MSR:
-
MitoSOX red
- DMSO:
-
Dimethyl sulfoxide
- ELISA:
-
Enzyme-linked immune sorbent assay
- BCA:
-
Bicinchoninic acid assay
- SDS-PAGE:
-
Sodium dodecyl sulfate polyacrylamide gel electrophoresis
- PVDF:
-
Polyvinylidene difluoride
- TBST:
-
Tris-buffered saline with Tween
- IAEC:
-
Institutional Animal Ethics Committee
- CMC:
-
Carboxy methyl cellulose
- CS:
-
Cecal slurry
- P.O.:
-
Peroral
- TGA:
-
Thioglycollate
- MMP:
-
Matrix metalloproteinases
- RNS:
-
Reactive nitrogen species
- ETC:
-
Electron transport chain
- ATP:
-
Adenosine triphosphate
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Acknowledgements
Authors acknowledge the excellent technical help of Mr. C·P Pandey for the central instrument facility, Mr. A.L. Vishwakarma, and Mrs. M. Chaturvedi for the Flow Cytometry experiment from Sophisticated Analytical Instrument Facility; CSIR-CDRI, Lucknow. This paper bears CDRI communication number 10375.
Funding
Grant support to MKB from CSIR, CDRI, and DST (EMR/2016/005340) project is acknowledged. Award of senior research fellowships to HA (3/1/2/(7)/CVD/2018-NCD-II) and SSR (3/1/2/(1)/OBS/18/NCD-II) from ICMR is gratefully acknowledged.
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HA performed the majority of experiments, generated figures, analysed the data, and wrote the manuscript draft. SSR involved in in vivo LPS-induced endotoxemia mice models, VS was involved initially in standardization of a few in vivo protocols and experiments, MD gave critical inputs related to in vitro, in vivo studies, and manuscript preparation, and MKB is responsible for the overall concept, project generation, and conduct and finalization of the manuscript.
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All animal procedures were in accordance with the IAEC (approval number: IAEC/2013/53/Renew-04 (240/17)/Dated-07/03/2017 & IAEC/2016/152/Dated-04/11/2016), which follow the Committee for the Purpose of Control and Supervision of Experiments on Animals guidelines and conforming to the Indian National Science Academy international norms.
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Experiments using human blood were conducted out after getting necessary ethical permission from the Institute's human research ethics committee at King George's Medical University (KGMC), Lucknow, India.
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Agarwal, H., Sukka, S.R., Singh, V. et al. Standardized fraction of Xylocarpus moluccensis inhibits inflammation by modulating MAPK-NFκB and ROS-HIF1α-PKM2 activation. Inflamm. Res. 71, 423–437 (2022). https://doi.org/10.1007/s00011-022-01549-3
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DOI: https://doi.org/10.1007/s00011-022-01549-3