Abstract
Acute fluoride (F−) exposure adversely impairs cardiac functions. We previously reported that acute F− toxicity causes modulation in oxidant and antioxidant systems, heat shock proteins, cytoskeletal proteins and AMPK signaling proteins in the myocardium of rats. With these findings, we hypothesized that acute F− intoxication may trigger an acute myocardial inflammatory response through the activation of NF-κB signaling and reduction of redox signaling regulatory system. To test this hypothesis, we treated male Wistar rats with single oral doses of 45 and 90 mg/kg of F− for 24 h. The myocardium of F− treated rats showed increased expression of pNF-κB, pIκKα/β eventually leading to the increased expression of downstream target TNFα—a major proinflammatory cytokine secreted in the inflammatory process. F− intoxication decreased the mRNA expression of redox genes—Sirt1, Sirt3, Prdx2, Glrx1, Trx1, and Trx2. In addition, we observed decreased protein expression of Nrf2, GCLC, and NQO1 in the cardiac tissues of F− treated rats. This study reveals that F− toxicity triggers myocardial inflammatory response and depletes redox signaling molecules in the myocardium of rats. We conclude that NF-κB activation with decreased redox gene expression might be associated with the pathophysiology of F− induced cardiac dysfunction in rats. This finding provides new insights into the cardiovascular pathophysiology in acute F− toxicity.
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Abbreviations
- AMPK :
-
5′ Adenosine monophosphate-activated protein kinase
- DAB :
-
3,3′-Diaminobenzidine
- F − :
-
Fluoride
- GCLC :
-
Glutamate-cysteine ligase catalytic subunit
- Glrx1 :
-
Glutaredoxin 1
- IκKα/β :
-
Inhibitor of nuclear factor kappa-B kinase α/β
- NF-κB :
-
Nuclear factor kappa light chain enhancer of activated B cells
- NQO1 :
-
NAD(P)H dehydrogenase [quinone] 1
- Nrf2 :
-
Nuclear factor-erythroid 2 (NF-E2)-related factor 2
- Prdx2 :
-
Peroxiredoxin 2
- ROS :
-
Reactive oxygen species
- Sirt1 :
-
Silent mating type information regulation 2, homolog 1
- Sirt3 :
-
Silent mating type information regulation 2, homolog 3
- TMB :
-
3,3′,5,5′-Tetramethylbenzidine
- TNFα :
-
Tumour necrosis factor alpha
- Trx1 :
-
Cytosolic thioredoxin 1
- Trx2 :
-
Mitochondrial thioredoxin 2
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Acknowledgements
LP extends his thanks to the Indian Council of Medical Research, New Delhi, for financial assistance in the form of a Senior Research Fellowship (No. 45/25/2013/BMS/TRM). AR acknowledges the UGC-BSR Senior Research Fellowship (UGC-BSR No. F7-25/2007) funded by UGC-BSR, New Delhi, India. This work was supported by the University Grants Commission—Special Assistance Programme (UGC-SAP-II:F-3-20/2013) and Department of Science and Technology, Fund for Improvement of Science and Technology infrastructure in universities and higher educational institutions (DST-FIST:SR/FST/LSI-618/2014), New Delhi, India.
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Panneerselvam, L., Raghunath, A., Sundarraj, K. et al. Acute fluoride exposure alters myocardial redox and inflammatory markers in rats. Mol Biol Rep 46, 6155–6164 (2019). https://doi.org/10.1007/s11033-019-05050-9
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DOI: https://doi.org/10.1007/s11033-019-05050-9