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Yuan T, Qian H, Yu X, Meng J, Lai CT, Jiang H, Zhao JN, Bao NR. Proteomic analysis reveals rotator cuff injury caused by oxidative stress. Ther Adv Chronic Dis 2021; 12:2040622320987057. [PMID: 33796243 PMCID: PMC7975570 DOI: 10.1177/2040622320987057] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Accepted: 12/18/2020] [Indexed: 12/16/2022] Open
Abstract
Background and aims: Rotator cuff tendinopathy is common and is related to pain and dysfunction.
However, the pathological mechanism of rotator cuff injury and shoulder pain
is unclear. Objective: to investigate the pathological mechanism of rotator
cuff injury and shoulder pain, and screen out the marker proteins related to
rotator cuff injury by proteomics. Methods: Subacromial synovium specimens were collected from patients undergoing
shoulder arthroscopic surgery. The experimental group were patients with
rotator cuff repair surgery, and the control group were patients with
habitual dislocation of the shoulder joint. Pathological examination was
performed, and then followed by non-labeled quantitative proteomic
detection. Finally, from analysis of the biological information of the
samples, specific proteins related to rotator cuff injury and shoulder pain
were deduced by functional analysis of differential proteins. Results: All the patients in experimental groups were representative. A large number
of adipocytes and inflammatory cells were found in the pathological sections
of the experimental group; the proteomics analysis screen identified 80
proteins with significant differences, and the analysis of protein function
revealed that S100A11 (p = 0.011), PLIN4
(p = 0.017), HYOU1 (p = 0.002) and
CLIC1 (p = 0.007) were closely related to oxidative stress
and chronic inflammation. Conclusion: Rotator cuff injury is closely related to oxidative stress and chronic
inflammatory response, and the results suggest that the expression of
S100A11, PLIN4, HYOU1 and CLIC1 in the synovium of rotator cuff injury
provides a new marker for the study of its pathological mechanism.
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Affiliation(s)
- Tao Yuan
- The First School of Clinical Medicine, Southern Medical University, Guangzhou, China
| | - Hong Qian
- The First School of Clinical Medicine, Southern Medical University, Guangzhou, China
| | - Xin Yu
- Department of Orthopedics, Jinling Hospital, Medical School of Nanjing University, Nanjing, China
| | - Jia Meng
- Department of Orthopedics, Jinling Hospital, Nanjing, China
| | - Cheng-Teng Lai
- Department of Orthopedics, Jinling Hospital, Medical School of Nanjing University, Nanjing, China
| | - Hui Jiang
- Department of Orthopedics, Jinling Hospital, Nanjing, China
| | - Jian-Ning Zhao
- Department of Orthopedics, Nanjing Jinling Hospital, 305 Zhongshan East Road, Nanjing 210002, China The First School of Clinical Medicine, Southern Medical University, Guangzhou 510515, China Department of Orthopedics, Jinling Hospital, Medical School of Nanjing University, Nanjing 210002, China
| | - Ni-Rong Bao
- Department of Orthopedics, Nanjing Jinling Hospital, 305 Zhongshan East Road, Nanjing 210002, China The First School of Clinical Medicine, Southern Medical University, Guangzhou 510515, China Department of Orthopedics, Jinling Hospital, Medical School of Nanjing University, Nanjing 210002, China
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Zhao T, Ma J, Li L, Teng W, Tian Y, Ma Y, Wang W, Yan W, Jiao P. MKP-5 Relieves Lipotoxicity-Induced Islet β-Cell Dysfunction and Apoptosis via Regulation of Autophagy. Int J Mol Sci 2020; 21:ijms21197161. [PMID: 32998359 PMCID: PMC7582937 DOI: 10.3390/ijms21197161] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2020] [Revised: 09/16/2020] [Accepted: 09/25/2020] [Indexed: 01/28/2023] Open
Abstract
Mitogen-activated protein kinase phosphatase-5 (MKP-5) is a regulator of extracellular signaling that is known to regulate lipid metabolism. In this study, we found that obesity caused by a high-fat diet (HFD) decreased the expression of MKP-5 in the pancreas and primary islet cells derived from mice. Then, we further investigated the role of MKP-5 in the protection of islet cells from lipotoxicity by modulating MKP-5 expression. As a critical inducer of lipotoxicity, palmitic acid (PA) was used to treat islet β-cells. We found that MKP-5 overexpression restored PA-mediated autophagy inhibition in Rin-m5f cells and protected these cells from PA-induced apoptosis and dysfunction. Consistently, a lack of MKP-5 aggravated the adverse effects of lipotoxicity. Islet cells from HFD-fed mice were infected using recombinant adenovirus expressing MKP-5 (Ad-MKP-5), and we found that Ad-MKP-5 was able to alleviate HFD-induced apoptotic protein activation and relieve the HFD-mediated inhibition of functional proteins. Notably, HFD-mediated impairments in autophagic flux were restored by Ad-MKP-5 transduction. Furthermore, the autophagy inhibitor 3-methyladenine (3-MA) was used to treat Rin-m5f cells, confirming that the MKP-5 overexpression suppressed apoptosis, dysfunction, inflammatory response, and oxidative stress induced by PA via improving autophagic signaling. Lastly, employing c-Jun amino-terminal kinas (JNK), P38, or extracellular-regulated kinase (ERK) inhibitors, we established that the JNK and P38 MAPK pathways were involved in the MKP-5-mediated apoptosis, dysfunction, and autophagic inhibition observed in islet β cells in response to lipotoxicity.
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Affiliation(s)
| | | | | | | | | | | | | | - Weiqun Yan
- Correspondence: (W.Y.); (P.J.); Tel.: +86-431-8561-9289 (P.J.)
| | - Ping Jiao
- Correspondence: (W.Y.); (P.J.); Tel.: +86-431-8561-9289 (P.J.)
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Park SJ, Nam J, Ahn CW, Kim Y. Anti-diabetic properties of different fractions of Korean red ginseng. JOURNAL OF ETHNOPHARMACOLOGY 2019; 236:220-230. [PMID: 30849506 DOI: 10.1016/j.jep.2019.01.044] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2018] [Revised: 01/20/2019] [Accepted: 01/21/2019] [Indexed: 06/09/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Korean red ginseng (KRG) has been traditionally used to treat diabetes. Ginsenosides are considered as the major bioactive components mediating anti-diabetic effects of KRG. However, considering that ginsenosides account for only about 3-4% of ginsengs, other fractions of KRG may also carry potential anti-diabetic effects. There is no study reporting the differentiated effects of ginsenosides (Spn) and non-saponin fractions (NSpn) of KRG on glycemic control. AIM OF THE STUDY We investigated the effects of KRG, Spn, and NSpn on the indications of glycemic control and sought to elucidate physiological factors contributing their effects. MATERIALS AND METHODS Human T2DM mimicking Nagoya-Shibata-Yasuda (NSY/hos) mice were given KRG, Spn, or NSpn admixed in rodent diet at 200 mg/kg/day for 24 weeks. Glycemic and obesity indications, blood lipid profile, systematic and local oxidative stress markers in metabolically important organs, and systematic inflammatory markers were assessed. Molecular assessments associated with glycemic control in liver and skeletal muscle were further performed. RESULTS KRG attenuated deterioration in glucose homeostasis as evidenced by significantly lower fasting blood glucose from 22nd week and AUC during GTT at the end of the experiment compare to control. Spn enhanced insulin secretion in response to glucose stimulation and reduced protein level of glycogen phosphorylase in liver. On the other hand, NSpn ameliorated oxidative stress and inflammation. Some beneficial effects of Spn and NSpn were reflected in KRG treated mice. KRG also attenuated the accumulation of malondialdehyde in skeletal muscle and, accordingly, enhanced insulin responsiveness compare to control. CONCLUSION Anti-diabetic properties of KRG are not solely determined by the contents of ginsenosides but the harmonic functions of its different fractions.
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Affiliation(s)
- Soo Jeong Park
- Brain Korea 21 Plus Project for Medical Science, Yonsei University, 50-1 Yonsei-Ro Seodaemun-Gu, Seoul, 03722, Republic of Korea.
| | - Jisun Nam
- Severance Institute for Vascular and Metabolic Research, Yonsei University College of Medicine, 50-1 Yonsei-Ro Seodaemun-Gu, Seoul, 03722, Republic of Korea; Department of Internal Medicine, Yonsei University College of Medicine, 50-1 Yonsei-Ro Seodaemun-Gu, Seoul, 03722, Republic of Korea.
| | - Chul Woo Ahn
- Severance Institute for Vascular and Metabolic Research, Yonsei University College of Medicine, 50-1 Yonsei-Ro Seodaemun-Gu, Seoul, 03722, Republic of Korea; Department of Internal Medicine, Yonsei University College of Medicine, 50-1 Yonsei-Ro Seodaemun-Gu, Seoul, 03722, Republic of Korea.
| | - YuSik Kim
- Severance Institute for Vascular and Metabolic Research, Yonsei University College of Medicine, 50-1 Yonsei-Ro Seodaemun-Gu, Seoul, 03722, Republic of Korea.
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Tamarai K, Bhatti JS, Reddy PH. Molecular and cellular bases of diabetes: Focus on type 2 diabetes mouse model-TallyHo. Biochim Biophys Acta Mol Basis Dis 2019; 1865:2276-2284. [PMID: 31082469 DOI: 10.1016/j.bbadis.2019.05.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Revised: 05/08/2019] [Accepted: 05/09/2019] [Indexed: 12/17/2022]
Abstract
Diabetes is a chronic lifestyle disorder that affects millions of people worldwide. Diabetes is a condition where the body does not produce sufficient insulin or does not use it efficiently. Insulin resistance in diabetes or obesity causes the pancreatic β-cells to increase the insulin output. Diabetes occurs in multiple forms, including type 1, type 2, type 3 and gestational. Type 2 diabetes accounts for ∼90-95% of total affected population and is associated with both impaired insulin production by the β-cells of the pancreas and impaired insulin release in response to high blood glucose levels. Diabetes is tightly linked with genetic mutations and genetic and lifestyle activities, including diet and exercise. Recent epidemiological studies established a close link between the diabetes and progression to Alzheimer's disease. This article summarizes various molecular mechanisms involved in the developments of diabetes, including biochemical characteristics, genetic and molecular links with Alzheimer's disease, β-cell function, and factors associated with diabetes. This will help us in the development of novel therapeutic strategies targeting AD in future.
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Affiliation(s)
- Kavya Tamarai
- Internal Medicine Department, Texas Tech University Health Sciences Center, 3601 4(th) Street, Lubbock, TX 79430, United States
| | - Jasvinder Singh Bhatti
- Internal Medicine Department, Texas Tech University Health Sciences Center, 3601 4(th) Street, Lubbock, TX 79430, United States; Department of Biotechnology, Sri Guru Gobind Singh College, Chandigarh, India
| | - P Hemachandra Reddy
- Internal Medicine Department, Texas Tech University Health Sciences Center, 3601 4(th) Street, Lubbock, TX 79430, United States; Garrison Institute on Aging, Texas Tech University Health Sciences Center, 3601 4(th) Street, MS 9424, Lubbock, TX 79430, United States; Cell Biology & Biochemistry Department, Texas Tech University Health Sciences Center, 3601 4(th) Street, Lubbock, TX 79430, United States; Pharmacology & Neuroscience Department, Texas Tech University Health Sciences Center, 3601 4(th) Street, MS 9424, Lubbock, TX 79430, United States; Neurology Department, Texas Tech University Health Sciences Center, 3601 4(th) Street, MS 9424, Lubbock, TX 79430, United States; Speech, Language and Hearing Sciences Department, Texas Tech University Health Sciences Center, 3601 4(th) Street, MS 9424, Lubbock, TX 79430, United States; Department of Public Health, Graduate School of Biomedical Sciences, 3601 4(th) Street, MS 9424, Lubbock, TX 79430, United States.
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Feng XT, Duan HM, Li SL. Protective role of Pollen Typhae total flavone against the palmitic acid-induced impairment of glucose-stimulated insulin secretion involving GPR40 signaling in INS-1 cells. Int J Mol Med 2017; 40:922-930. [DOI: 10.3892/ijmm.2017.3070] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Accepted: 07/05/2017] [Indexed: 11/05/2022] Open
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Kongsted AH, Tygesen MP, Husted SV, Oliver MH, Tolver A, Christensen VG, Nielsen JH, Nielsen MO. Programming of glucose-insulin homoeostasis: long-term consequences of pre-natal versus early post-natal nutrition insults. Evidence from a sheep model. Acta Physiol (Oxf) 2014; 210:84-98. [PMID: 23452307 DOI: 10.1111/apha.12080] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2012] [Revised: 11/08/2012] [Accepted: 02/05/2013] [Indexed: 11/28/2022]
Abstract
AIM Exposure to adverse intra-uterine conditions can predispose for metabolic disorders later in life. By using a sheep model, we studied (i) how programming of glucose-insulin homoeostasis during late gestation is manifested later in life depending on the early post-natal dietary exposure and (ii) whether dietary alteration in obese individuals can prevent adverse outcomes of early life programming. METHODS During late gestation, twin-pregnant sheep were fed 100% (NORM) or 50% (LOW) of energy and protein requirements. After birth, offspring were exposed to a moderate (CONV) or high-carbohydrate-high-fat (HCHF) diet until around puberty. Offspring remaining thereafter (exclusively females) were fed a moderate diet until young adulthood. RESULTS LOW lambs had increased insulin secretory responses during intravenous glucose tolerance tests indicative of reduced insulin sensitivity. HCHF lambs were hypertriglyceridaemic, 75% had mild pancreatic collagen infiltration, and their acute insulin secretory response and insulin clearance during intravenous glucose and insulin tolerance tests, respectively, were reduced. However, NORM-HCHF in contrast to LOW-HCHF lambs had normal glucose tolerance, indicating that later health outcomes are highly influenced by pre-natal nutrition. Dietary alteration normalized glucose-insulin homoeostasis in adult HCHF females, whereas late-gestation undernutrition (LOW) permanently depressed insulin sensitivity. CONCLUSION Maintenance of glucose tolerance in sheep exposed to pre-natal undernutrition relied on pancreatic hypersecretion of insulin to compensate for reduced insulin sensitivity. A mismatching high-fat diet in early post-natal life interfered with this pancreatic hypersecretion resulting in reduced glucose tolerance. Early post-natal, but not late pre-natal, impacts on glucose-insulin homoeostasis could be reversed by dietary correction later in life.
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Affiliation(s)
- A. H. Kongsted
- Department of Veterinary Clinical and Animal Sciences; Faculty of Health and Medical Sciences; University of Copenhagen; Frederiksberg Denmark
| | | | - S. V. Husted
- Department of Veterinary Clinical and Animal Sciences; Faculty of Health and Medical Sciences; University of Copenhagen; Frederiksberg Denmark
| | - M. H. Oliver
- Ngapouri Farm Research Laboratory; Liggins Institute; University of Auckland; Auckland New Zealand
| | - A. Tolver
- Department of Basic Sciences and Environment; Faculty of Science; University of Copenhagen; Frederiksberg Denmark
| | - V. G. Christensen
- Department of Veterinary Clinical and Animal Sciences; Faculty of Health and Medical Sciences; University of Copenhagen; Frederiksberg Denmark
| | - J. H. Nielsen
- Department of Biomedical Sciences; Faculty of Health and Medical Sciences; University of Copenhagen; København N Denmark
| | - M. O. Nielsen
- Department of Veterinary Clinical and Animal Sciences; Faculty of Health and Medical Sciences; University of Copenhagen; Frederiksberg Denmark
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The combined effect of metformin and l-cysteine on inflammation, oxidative stress and insulin resistance in streptozotocin-induced type 2 diabetes in rats. Eur J Pharmacol 2013; 714:448-55. [DOI: 10.1016/j.ejphar.2013.07.002] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2013] [Revised: 05/20/2013] [Accepted: 07/01/2013] [Indexed: 01/17/2023]
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Koulajian K, Ivovic A, Ye K, Desai T, Shah A, Fantus IG, Ran Q, Giacca A. Overexpression of glutathione peroxidase 4 prevents β-cell dysfunction induced by prolonged elevation of lipids in vivo. Am J Physiol Endocrinol Metab 2013; 305:E254-62. [PMID: 23695217 DOI: 10.1152/ajpendo.00481.2012] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
We have shown that oxidative stress is a mechanism of free fatty acid (FFA)-induced β-cell dysfunction. Unsaturated fatty acids in membranes, including plasma and mitochondrial membranes, are substrates for lipid peroxidation, and lipid peroxidation products are known to cause impaired insulin secretion. Therefore, we hypothesized that mice overexpressing glutathione peroxidase-4 (GPx4), an enzyme that specifically reduces lipid peroxides, are protected from fat-induced β-cell dysfunction. GPx4-overexpressing mice and their wild-type littermate controls were infused intravenously with saline or oleate for 48 h, after which reactive oxygen species (ROS) were imaged, using dihydrodichlorofluorescein diacetate in isolated islets, and β-cell function was assessed ex vivo in isolated islets and in vivo during hyperglycemic clamps. Forty-eight-hour FFA elevation in wild-type mice increased ROS and the lipid peroxidation product malondialdehyde and impaired β-cell function ex vivo in isolated islets and in vivo, as assessed by decreased disposition index. Also, islets of wild-type mice exposed to oleate for 48 h had increased ROS and lipid peroxides and decreased β-cell function. In contrast, GPx4-overexpressing mice showed no FFA-induced increase in ROS and lipid peroxidation and were protected from the FFA-induced impairment of β-cell function assessed in vitro, ex vivo and in vivo. These results implicate lipid peroxidation in FFA-induced β-cell dysfunction.
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Affiliation(s)
- Khajag Koulajian
- Department of Physiology, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
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Siebel AL, Natoli AK, Yap FYT, Carey AL, Reddy-Luthmoodoo M, Sviridov D, Weber CIK, Meneses-Lorente G, Maugeais C, Forbes JM, Kingwell BA. Effects of High-Density Lipoprotein Elevation With Cholesteryl Ester Transfer Protein Inhibition on Insulin Secretion. Circ Res 2013; 113:167-75. [DOI: 10.1161/circresaha.113.300689] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Andrew L. Siebel
- From the Baker IDI Heart and Diabetes Institute, Melbourne, Australia (A.L.S., A.K.N., F.Y.T.Y., A.L.C., M.R.-L., D.S., J.M.F., B.A.K.); and F. Hoffman La Roche, Basel, Switzerland (C.I.K.W., G.M.-L., C.M.)
| | - Alaina K. Natoli
- From the Baker IDI Heart and Diabetes Institute, Melbourne, Australia (A.L.S., A.K.N., F.Y.T.Y., A.L.C., M.R.-L., D.S., J.M.F., B.A.K.); and F. Hoffman La Roche, Basel, Switzerland (C.I.K.W., G.M.-L., C.M.)
| | - Felicia Y. T. Yap
- From the Baker IDI Heart and Diabetes Institute, Melbourne, Australia (A.L.S., A.K.N., F.Y.T.Y., A.L.C., M.R.-L., D.S., J.M.F., B.A.K.); and F. Hoffman La Roche, Basel, Switzerland (C.I.K.W., G.M.-L., C.M.)
| | - Andrew L. Carey
- From the Baker IDI Heart and Diabetes Institute, Melbourne, Australia (A.L.S., A.K.N., F.Y.T.Y., A.L.C., M.R.-L., D.S., J.M.F., B.A.K.); and F. Hoffman La Roche, Basel, Switzerland (C.I.K.W., G.M.-L., C.M.)
| | - Medini Reddy-Luthmoodoo
- From the Baker IDI Heart and Diabetes Institute, Melbourne, Australia (A.L.S., A.K.N., F.Y.T.Y., A.L.C., M.R.-L., D.S., J.M.F., B.A.K.); and F. Hoffman La Roche, Basel, Switzerland (C.I.K.W., G.M.-L., C.M.)
| | - Dmitri Sviridov
- From the Baker IDI Heart and Diabetes Institute, Melbourne, Australia (A.L.S., A.K.N., F.Y.T.Y., A.L.C., M.R.-L., D.S., J.M.F., B.A.K.); and F. Hoffman La Roche, Basel, Switzerland (C.I.K.W., G.M.-L., C.M.)
| | - Chek Ing Kiu Weber
- From the Baker IDI Heart and Diabetes Institute, Melbourne, Australia (A.L.S., A.K.N., F.Y.T.Y., A.L.C., M.R.-L., D.S., J.M.F., B.A.K.); and F. Hoffman La Roche, Basel, Switzerland (C.I.K.W., G.M.-L., C.M.)
| | - Georgina Meneses-Lorente
- From the Baker IDI Heart and Diabetes Institute, Melbourne, Australia (A.L.S., A.K.N., F.Y.T.Y., A.L.C., M.R.-L., D.S., J.M.F., B.A.K.); and F. Hoffman La Roche, Basel, Switzerland (C.I.K.W., G.M.-L., C.M.)
| | - Cyrille Maugeais
- From the Baker IDI Heart and Diabetes Institute, Melbourne, Australia (A.L.S., A.K.N., F.Y.T.Y., A.L.C., M.R.-L., D.S., J.M.F., B.A.K.); and F. Hoffman La Roche, Basel, Switzerland (C.I.K.W., G.M.-L., C.M.)
| | - Josephine M. Forbes
- From the Baker IDI Heart and Diabetes Institute, Melbourne, Australia (A.L.S., A.K.N., F.Y.T.Y., A.L.C., M.R.-L., D.S., J.M.F., B.A.K.); and F. Hoffman La Roche, Basel, Switzerland (C.I.K.W., G.M.-L., C.M.)
| | - Bronwyn A. Kingwell
- From the Baker IDI Heart and Diabetes Institute, Melbourne, Australia (A.L.S., A.K.N., F.Y.T.Y., A.L.C., M.R.-L., D.S., J.M.F., B.A.K.); and F. Hoffman La Roche, Basel, Switzerland (C.I.K.W., G.M.-L., C.M.)
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Koulajian K, Desai T, Liu GC, Ivovic A, Patterson JN, Tang C, El-Benna J, Joseph JW, Scholey JW, Giacca A. NADPH oxidase inhibition prevents beta cell dysfunction induced by prolonged elevation of oleate in rodents. Diabetologia 2013; 56:1078-87. [PMID: 23429921 PMCID: PMC3622749 DOI: 10.1007/s00125-013-2858-4] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2012] [Accepted: 01/21/2013] [Indexed: 12/16/2022]
Abstract
AIMS/HYPOTHESIS The activation of NADPH oxidase has been implicated in NEFA-induced beta cell dysfunction. However, the causal role of this activation in vivo remains unclear. Here, using rodents, we investigated whether pharmacological or genetic inhibition of NADPH oxidase could prevent NEFA-induced beta cell dysfunction in vivo. METHODS Normal rats were infused for 48 h with saline or oleate with or without the NADPH oxidase inhibitor apocynin. In addition, NADPH oxidase subunit p47(phox)-null mice and wild-type littermate controls were infused with saline or oleate for 48 h. This was followed by measurement of NADPH oxidase activity, reactive oxygen species (ROS) and superoxide imaging and assessment of beta cell function in isolated islets and hyperglycaemic clamps. RESULTS Oleate infusion in rats increased NADPH oxidase activity, consistent with increased total but not mitochondrial superoxide in islets and impaired beta cell function in isolated islets and during hyperglycaemic clamps. Co-infusion of apocynin with oleate normalised NADPH oxidase activity and total superoxide levels and prevented beta cell dysfunction. Similarly, 48 h NEFA elevation in wild-type mice increased total but not mitochondrial superoxide and impaired beta cell function in isolated islets. p47(phox)-null mice were protected against these effects when subjected to 48 h oleate infusion. Finally, oleate increased the levels of total ROS, in both models, whereas inhibition of NADPH oxidase prevented this increase, suggesting that NADPH oxidase is the main source of ROS in this model. CONCLUSIONS/INTERPRETATION These data show that NADPH-oxidase-derived cytosolic superoxide is increased in islets upon oleate infusion in vivo; and whole-body NADPH-oxidase inhibition decreases superoxide in concert with restoration of islet function.
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Affiliation(s)
- K. Koulajian
- Department of Physiology, University of Toronto, Medical Sciences Building, Room 3336-1 King’s College Circle, Toronto, ON Canada M5S 1A8
| | - T. Desai
- Department of Physiology, University of Toronto, Medical Sciences Building, Room 3336-1 King’s College Circle, Toronto, ON Canada M5S 1A8
| | - G. C. Liu
- Institute of Medical Sciences, University of Toronto, Toronto, ON Canada
| | - A. Ivovic
- Department of Physiology, University of Toronto, Medical Sciences Building, Room 3336-1 King’s College Circle, Toronto, ON Canada M5S 1A8
| | - J. N. Patterson
- School of Pharmacy, University of Waterloo, Waterloo, ON Canada
| | - C. Tang
- Department of Physiology, University of Toronto, Medical Sciences Building, Room 3336-1 King’s College Circle, Toronto, ON Canada M5S 1A8
| | - J. El-Benna
- Inserm, U773, Centre de Recherche Biomédicale Bichat Beaujon CRB3, Paris, France
- Université Paris 7 site Bichat, UMRS 773, Paris, France
| | - J. W. Joseph
- School of Pharmacy, University of Waterloo, Waterloo, ON Canada
| | - J. W. Scholey
- Institute of Medical Sciences, University of Toronto, Toronto, ON Canada
- Division of Nephrology, University of Toronto, Toronto, ON Canada
| | - A. Giacca
- Department of Physiology, University of Toronto, Medical Sciences Building, Room 3336-1 King’s College Circle, Toronto, ON Canada M5S 1A8
- Institute of Medical Sciences, University of Toronto, Toronto, ON Canada
- Department of Medicine, University of Toronto, Toronto, ON Canada
- Banting and Best Diabetes Centre, University of Toronto, Toronto, ON Canada
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Bibliography. Current world literature. Adrenal cortex. Curr Opin Endocrinol Diabetes Obes 2011; 18:231-3. [PMID: 21522003 DOI: 10.1097/med.0b013e3283457c7d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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