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Bhattacharjee A, Prasad SK, Banerjee O, Singh S, Banerjee A, Bose A, Pal S, Maji BK, Mukherjee S. Targeting mitochondria with folic acid and vitamin B 12 ameliorates nicotine mediated islet cell dysfunction. ENVIRONMENTAL TOXICOLOGY 2018; 33:988-1000. [PMID: 29972271 DOI: 10.1002/tox.22586] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Revised: 05/27/2018] [Accepted: 05/28/2018] [Indexed: 06/08/2023]
Abstract
Nicotine, one of the well-known highly toxic components of cigarette smoke, causes a number of adverse health effects and diseases. Our previous study has shown that nicotine induces reactive oxygen species (ROS) in islet cell and disrupts islet cell mitochondrial membrane potential (ΔΨm). However, supplementation with folic acid and vitamin B12 were found effective against nicotine induced changes in pancreatic islet cells. But the toxicological effects and underlying mechanisms of nicotine-induced mitochondrial dysfunction is still unknown. In this study, nicotine exposure decreases mitochondrial enzymes (pyruvate dehydrogenase, alpha-ketoglutarate dehydrogenase, aconitase, malate dehydrogenase) activities by increasing cytosolic Ca2+ level which may contribute to increased mitochondrial ROS production by raising its flow to mitochondria. This in turn produces malondialdehyde and nitric oxide (NO) with a concomitant decrease in the activities of antioxidative enzymes and glutathione levels leading to loss of ΔΨm. Simultaneously, nicotine induces pancreatic islet cell apoptosis by modulating ΔΨm via increased cytosolic Ca2+ level, altered Bcl-2, Bax, cytochrome c, caspase-9, PARP expressions which were prevented by the supplementation of folic acid and vitamin B12 . In conclusion, nicotine alters islet cell mitochondrial redox status, apoptotic machinery, and enzymes to cause disruption in the ΔΨm and supplementation of folic acid and vitamin B12 possibly blunted all these mitochondrial alterations. Therefore, this study may help to determine the pathophysiology of nicotine-mediated islet cell mitochondrial dysfunction.
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Affiliation(s)
- Ankita Bhattacharjee
- Department of Physiology, Serampore College, Serampore, Hooghly, West Bengal, India
| | - Shilpi Kumari Prasad
- Department of Physiology, Serampore College, Serampore, Hooghly, West Bengal, India
| | - Oly Banerjee
- Department of Physiology, Serampore College, Serampore, Hooghly, West Bengal, India
| | - Siddhartha Singh
- Department of Physiology, Serampore College, Serampore, Hooghly, West Bengal, India
| | - Arnab Banerjee
- Department of Physiology, Serampore College, Serampore, Hooghly, West Bengal, India
| | - Ananya Bose
- Department of Physiology, Serampore College, Serampore, Hooghly, West Bengal, India
| | - Swagata Pal
- Department of Physiology, Raja Peary Mohan College, Uttarpara, Kotrung, Hooghly, West Bengal, India
| | - Bithin Kumar Maji
- Department of Physiology, Serampore College, Serampore, Hooghly, West Bengal, India
| | - Sandip Mukherjee
- Department of Physiology, Serampore College, Serampore, Hooghly, West Bengal, India
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Folic acid protects against experimental prenatal nicotine – induced cardiac injury by decreasing inflammatory changes, serum TNF and COX - 2 expression. PATHOPHYSIOLOGY 2018; 25:151-156. [DOI: 10.1016/j.pathophys.2018.04.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2017] [Revised: 03/24/2018] [Accepted: 04/01/2018] [Indexed: 01/23/2023] Open
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