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Gong J, Dong H, Jiang SJ, Wang DK, Fang K, Yang DS, Zou X, Xu LJ, Wang KF, Lu FE. Fenugreek lactone attenuates palmitate-induced apoptosis and dysfunction in pancreatic β-cells. World J Gastroenterol 2015; 21:13457-13465. [PMID: 26730156 PMCID: PMC4690174 DOI: 10.3748/wjg.v21.i48.13457] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2015] [Revised: 08/09/2015] [Accepted: 09/28/2015] [Indexed: 02/06/2023] Open
Abstract
AIM To investigate the effect of fenugreek lactone (FL) on palmitate (PA)-induced apoptosis and dysfunction in insulin secretion in pancreatic NIT-1 β-cells. METHODS Cells were cultured in the presence or absence of FL and PA (0.25 mmol/L) for 48 h. Then, lipid droplets in NIT-1 cells were observed by oil red O staining, and the intracellular triglyceride content was measured by colorimetric assay. The insulin content in the supernatant was determined using an insulin radio-immunoassay. Oxidative stress-associated parameters, including total superoxide dismutase, glutathione peroxidase and catalase activity and malondialdehyde levels in the suspensions were also examined. The expression of upstream regulators of oxidative stress, such as protein kinase C-α (PKC-α), phospho-PKC-α and P47phox, were determined by Western blot analysis and real-time PCR. In addition, apoptosis was evaluated in NIT-1 cells by flow cytometry assays and caspase-3 viability assays. RESULTS Our results indicated that compared to the control group, PA induced an increase in lipid accumulation and apoptosis and a decrease in insulin secretion in NIT-1 cells. Oxidative stress in NIT-1 cells was activated after 48 h of exposure to PA. However, FL reversed the above changes. These effects were accompanied by the inhibition of PKC-α, phospho-PKC-α and P47phox expression and the activation of caspase-3. CONCLUSION FL attenuates PA-induced apoptosis and insulin secretion dysfunction in NIT-1 pancreatic β-cells. The mechanism for this action may be associated with improvements in levels of oxidative stress.
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Gong J, Dong H, Jiang SJ, Wang DK, Fang K, Yang DS, Zou X, Xu LJ, Wang KF, Lu FE. Fenugreek lactone attenuates palmitate-induced apoptosis and dysfunction in pancreatic β-cells. World J Gastroenterol 2015. [PMID: 26730156 DOI: pmid/26730156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/10/2023] Open
Abstract
AIM To investigate the effect of fenugreek lactone (FL) on palmitate (PA)-induced apoptosis and dysfunction in insulin secretion in pancreatic NIT-1 β-cells. METHODS Cells were cultured in the presence or absence of FL and PA (0.25 mmol/L) for 48 h. Then, lipid droplets in NIT-1 cells were observed by oil red O staining, and the intracellular triglyceride content was measured by colorimetric assay. The insulin content in the supernatant was determined using an insulin radio-immunoassay. Oxidative stress-associated parameters, including total superoxide dismutase, glutathione peroxidase and catalase activity and malondialdehyde levels in the suspensions were also examined. The expression of upstream regulators of oxidative stress, such as protein kinase C-α (PKC-α), phospho-PKC-α and P47phox, were determined by Western blot analysis and real-time PCR. In addition, apoptosis was evaluated in NIT-1 cells by flow cytometry assays and caspase-3 viability assays. RESULTS Our results indicated that compared to the control group, PA induced an increase in lipid accumulation and apoptosis and a decrease in insulin secretion in NIT-1 cells. Oxidative stress in NIT-1 cells was activated after 48 h of exposure to PA. However, FL reversed the above changes. These effects were accompanied by the inhibition of PKC-α, phospho-PKC-α and P47phox expression and the activation of caspase-3. CONCLUSION FL attenuates PA-induced apoptosis and insulin secretion dysfunction in NIT-1 pancreatic β-cells. The mechanism for this action may be associated with improvements in levels of oxidative stress.
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Affiliation(s)
- Jing Gong
- Jing Gong, Hui Dong, Shu-Jun Jiang, Ding-Kun Wang, Ke Fang, Xin Zou, Li-Jun Xu, Kai-Fu Wang, Fu-Er Lu, Institute of Integrated Traditional Chinese and Western Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei Province, China
| | - Hui Dong
- Jing Gong, Hui Dong, Shu-Jun Jiang, Ding-Kun Wang, Ke Fang, Xin Zou, Li-Jun Xu, Kai-Fu Wang, Fu-Er Lu, Institute of Integrated Traditional Chinese and Western Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei Province, China
| | - Shu-Jun Jiang
- Jing Gong, Hui Dong, Shu-Jun Jiang, Ding-Kun Wang, Ke Fang, Xin Zou, Li-Jun Xu, Kai-Fu Wang, Fu-Er Lu, Institute of Integrated Traditional Chinese and Western Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei Province, China
| | - Ding-Kun Wang
- Jing Gong, Hui Dong, Shu-Jun Jiang, Ding-Kun Wang, Ke Fang, Xin Zou, Li-Jun Xu, Kai-Fu Wang, Fu-Er Lu, Institute of Integrated Traditional Chinese and Western Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei Province, China
| | - Ke Fang
- Jing Gong, Hui Dong, Shu-Jun Jiang, Ding-Kun Wang, Ke Fang, Xin Zou, Li-Jun Xu, Kai-Fu Wang, Fu-Er Lu, Institute of Integrated Traditional Chinese and Western Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei Province, China
| | - De-Sen Yang
- Jing Gong, Hui Dong, Shu-Jun Jiang, Ding-Kun Wang, Ke Fang, Xin Zou, Li-Jun Xu, Kai-Fu Wang, Fu-Er Lu, Institute of Integrated Traditional Chinese and Western Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei Province, China
| | - Xin Zou
- Jing Gong, Hui Dong, Shu-Jun Jiang, Ding-Kun Wang, Ke Fang, Xin Zou, Li-Jun Xu, Kai-Fu Wang, Fu-Er Lu, Institute of Integrated Traditional Chinese and Western Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei Province, China
| | - Li-Jun Xu
- Jing Gong, Hui Dong, Shu-Jun Jiang, Ding-Kun Wang, Ke Fang, Xin Zou, Li-Jun Xu, Kai-Fu Wang, Fu-Er Lu, Institute of Integrated Traditional Chinese and Western Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei Province, China
| | - Kai-Fu Wang
- Jing Gong, Hui Dong, Shu-Jun Jiang, Ding-Kun Wang, Ke Fang, Xin Zou, Li-Jun Xu, Kai-Fu Wang, Fu-Er Lu, Institute of Integrated Traditional Chinese and Western Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei Province, China
| | - Fu-Er Lu
- Jing Gong, Hui Dong, Shu-Jun Jiang, Ding-Kun Wang, Ke Fang, Xin Zou, Li-Jun Xu, Kai-Fu Wang, Fu-Er Lu, Institute of Integrated Traditional Chinese and Western Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei Province, China
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