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HOME > Cardiovasc Prev Pharmacother > Volume 4(2); 2022 > Article
Review Article Targets for rescue from fatty acid-induced lipotoxicity in pancreatic beta cells
Seok-Woo Hong1orcid, Won-Young Lee2orcid
Cardiovascular Prevention and Pharmacotherapy 2022;4(2):57-62.
DOI: https://doi.org/10.36011/cpp.2022.4.e9
Published online: April 26, 2022
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1Institute of Medical Research, Department of Internal Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea

2Division of Endocrinology and Metabolism, Department of Internal Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea

Corresponding to Won-Young Lee, MD, PhD Division of Endocrinology and Metabolism, Department of Internal Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, 29 Saemunan-ro, Jongno-gu, Seoul 03181, Korea. E-mail: wonyoung2.lee@samsung.com
• Received: February 4, 2022   • Revised: April 4, 2022   • Accepted: April 13, 2022

Copyright © 2022 Korean Society of Cardiovascular Disease Prevention; Korean Society of Cardiovascular Pharmacotherapy.

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

  • A persistent intake of excess calories increases plasma levels of free fatty acids, particularly the saturated form that has been shown to exert toxic effects on pancreatic beta cells by inducing dysfunction and apoptosis (i.e., lipotoxicity). An insufficient supply of insulin due to beta cell failure is a major factor in the onset and progression of type 2 diabetes; therefore, it is crucial to understand the cellular mechanisms of lipotoxicity to prevent beta cell failure. Many studies on the effects of lipotoxicity have demonstrated the various factors responsible for beta cell impairment, but the mechanisms of dysfunction and apoptosis resulting from lipotoxicity have not been fully described. This review discusses lipotoxicity-induced alterations of cellular mechanisms, and assesses drugs such as incretin mimetics, thiazolidinedione, and clusterin. Understanding the molecular mechanisms of lipotoxicity-induced beta cell failure is useful in guiding the development of new therapeutic targets for diabetes treatment.
Hyperglycemia is synergistically caused by defects in the peripheral action of insulin (insulin resistance) and the inadequacy of insulin secretion by pancreatic beta cells (beta cell failure) [1]. Dysfunctional insulin secretion due to beta cell impairment is essential for the onset and progression of diabetes [2]. Various physiologic stressors create harmful environments that influence beta cell function. These stressors include chronic exposure to high levels of glucose and lipids, and increased insulin demand due to insulin resistance in peripheral tissues, both of which are commonly observed in obesity-associated type 2 diabetes (T2D). In harmful environments, beta cells initially perform compensatory mechanisms to handle the cellular stress, but ultimately the reactions become pathologic and induce beta cell dysfunction and apoptosis.
Although lipids are essential building blocks of cellular membranes and are mediators of signaling, free fatty acids (FFAs) are a harmful environmental factor that can cause stress for beta cells in pathologic conditions. Many studies have observed high levels of plasma FFAs in animal models of diabetes and in patients with T2D [35], and negative parameters such as glucose intolerance and impaired insulin release are related to increased levels of saturated fatty acids (FAs) [68]. Lipotoxicity due to chronic exposure to high levels of saturated FAs seriously damages beta cell function with reduced insulin synthesis [911] and secretion [12,13], and eventually induces apoptosis [14,15]. Studies on beta cell failure have reported various cellular mechanisms responsible for the lipotoxicity-induced dysfunction and apoptosis, but the mechanisms have not been fully described and new models of beta cell impairment are still being investigated [16]. The present review focuses on several mechanisms affected by lipotoxicity and discusses chemical means of preventing beta cell impairment.
T2D is associated with high levels of FFAs, as well as accumulation of triglycerides in peripheral tissues [17]. Although FFAs can be cytotoxic in pancreatic beta cells by inducing apoptotic pathways that initiate mitochondrial dysfunction and cellular stress [18,19], the deposition of ectopic lipid in beta cells has been implicated as a main cause of beta cell impairment [20]. Chronic lipid stimulation of beta cells, such as in the later stages of T2D, appears to cause lipid accumulation and, ultimately, apoptosis [19,21]. Although the mechanism of beta cell apoptosis by FFAs is not completely understood, it is believed that lipotoxicity occurs when excess FFAs enter beta cells by non-oxidative metabolic pathways and cause lipid accumulation in beta cells [22,23].
Sterol regulatory element-binding proteins (SREBPs) are essential transcription factors that regulate the expression of the genes involved in cholesterol and fatty acid synthesis [24]. Three isoforms of SREBPs have been identified (SREBP-1a, SREBP-1c, and SREBP-2). SREBP-1a and SREBP-1c are isoforms of SREBP-1 that are produced from a single gene via the use of alternative promoters and first exons. SREBPs are produced in the membrane of the endoplasmic reticulum (ER) following cleavage of the NH2-terminal domain, and the mature form moves to the nucleus and operates as a transcription factor [24,25]. SREBP-1 preferentially regulates the expression of genes associated with the biosynthesis of FFAs and triglycerides, whereas SREBP-2 mainly controls genes associated with cholesterol [26,27]. Significantly increased SREBP-1c expression has been observed in the islets and livers of animals in diabetes models [28]. Moreover, SREBP-1c activation partially blocked the effect of anti-diabetic molecules, including leptin, metformin, adiponectin, and thiazolidinedione (TZD) [29]. SREBP1c might be an important target in alleviating lipotoxicity. Our team demonstrated that SREBP1c is involved in the protective effect of exendin-4 (an incretin mimetic) against FFA-induced lipotoxicity in beta cells [30]. Treatment with an exendin-4 agonist dramatically decreased FFA-induced beta cell dysfunction and apoptosis by repressing SREBP1c expression and activity (Fig. 1A). Additionally, genetic ablation of SREBP1c significantly attenuated the FFA-induced lipotoxicity in insulin secretion and beta cell apoptosis. These results suggest that there is a strong correlation between lipotoxicity and SREBP1c, and that regulation of SREBP1c could be an effective means of preventing lipotoxicity in pancreatic beta cells.
Several clinical studies have reported that anti-inflammatory therapy in patients with T2D improved beta cell function and hyperglycermia [31,32]. Exposure of pancreatic beta cells to circulating cytokines, such as tumor necrosis factor-alpha (TNF-α), interleukin 1-beta (IL-1β), and interferon-gamma, decreases insulin secretion and induces apoptosis by interruption of calcium (Ca2+) flow and cellular accumulation of islet amyloid polypeptide (IAPP) [3235]. Inflammation of beta cells is also caused by lipotoxicity through activation of the c-Jun N-terminal kinase (JNK) pathway. Exposure to FFAs induces various cellular disorders such as ceramide formation, ER stress, and mitochondrial dysfunction, and the chronic cellular dysfunction associated with activated JNK [36]. Activated JNK signaling increases the expression of TNF-α, IL-1β, IL-6, and IL-8, and activates nuclear factor-kappa B (NF-κB), leading to beta cell dysfunction and apoptosis [35,37].
ER stress is associated with cellular damage in all tissues [38], and pancreatic beta cells are particularly susceptible due to characteristics of the biosynthesis and secretion of insulin. Irregular expansion of the ER was measured in beta cells from patients with T2D, and ER stress markers were increased in islets from db/db mice and patients with T2D [39,40]. These studies suggest that increased ER stress is an etiologic factor causing T2D via induction of beta cell failure. High levels of glucose and lipids in the blood are known to induce the overproduction of insulin, leading to beta cell dysfunction and apoptosis through ER stress.40 In beta cells, FFA-induced ER stress is promoted by the reduction of ER Ca2+ caused by mitochondrial dysfunction and a decreased influx of cellular Ca2+ [41]. In the early phase of ER stress, the unfolded protein response (UPR) occurs to maintain ER function by upregulation of UPR-associated proteins, such as glucose-regulated protein 78 (GRP78), phospho-eukaryotic translation initiation factor 2-α (p-eIF2α), and activating transcription factor 6 (ATF6). However, the chronic activation of UPR eventually induces excessive expression of C/EBP homologous protein (CHOP) and finally results in apoptosis. CHOP is a transcriptional regulator that stimulates cell death by downregulating the anti-apoptotic protein Bcl-2 and upregulating cellular reactive oxygen species and ER oxidoreductase 1, leading to hyper-oxidizing conditions in the ER [42].
In a recent study, the authors investigated the relationship between the inflammatory response and ER stress in pancreatic beta cells [43]. The expression of inflammatory cytokines and ER stress markers spontaneously increased in lipotoxicity-induced beta cells; therefore, we established a toxicity model to induce inflammation and ER stress. Treatment with lipopolysaccharide, an inducer of the inflammatory response, significantly increased the expression of TNF-α, IL-6, and IL-1β via JNK/NF-κB activation. The expression of ER stress markers also remarkably increased with lipopolysaccharide treatment. Although treatment with tunicamycin, an ER stress inducer, significantly increased the expression of ER stress markers, it did not impact the expression of inflammatory cytokines. These results suggest that an inflammatory response is an inducer of ER stress, but not vice versa, in pancreatic beta cells. We also investigated a protector from inflammation and ER stress. TZDs have mainly been reported to improve the insulin sensitivity of peripheral tissues via regulation of peroxisome proliferator-activator gamma (PPARγ) [44,45]. However, several recent studies in human and animal models also reported that TZDs protect pancreatic beta cells against lipotoxicity [46]. Treatment with TZDs improved the viability and function of human beta cells by protecting them from IAPP accumulation induced by lipotoxicity [47]. Using in vivo and in vitro models, we also showed that treatment with pioglitazone, a TZD, attenuated the lipotoxicity-induced inflammatory response and ER stress in beta cells [43]. Treatment with pioglitazone in mice fed a high-fat diet significantly reduced fasting blood glucose levels, as well as the expression of ER stress markers (ATF6 and GRP78) and monocyte chemoattractant protein (MCP1, a marker of the inflammatory response) in pancreatic islets. These results suggested that the protective effect of TZDs against lipotoxicity in pancreatic beta cells is mediated by repression of the inflammatory response and ER stress (Fig. 1A).
Autophagy is an essential process for the recycling of unnecessary cellular components and guaranteeing survival of the cell during starvation. Whether autophagy is harmful or beneficial to beta cell function and survival has been a matter of debate, but several recent studies suggest that autophagy is essential to maintain beta cell homeostasis and insulin secretion. Indeed, long-term treatment of beta cells with FFAs showed increased autophagosome numbers, and the activation of autophagosomes is an indicator of their protective role against FFA-induced cell death [48,49]. Exposure of pancreatic beta cells to interleukin-1 induced an accumulation of autophagic vacuoles, presenting severe damage in the late phase of autophagy [50]. Defective autophagy was also detected in the pancreatic islets of animals in a diabetes model (db/db mice, high-fat fed mice and Zucker rats) [48,51]. In addition, knockout of the beta cell specific autophagy-related 7 (Atg7) gene, which regulates autophagy, resulted in insulin deficiency and impaired glucose tolerance, suggesting that autophagy is essential to beta cell function and survival [52]. Consistently, our study showed that upregulation of autophagy via increased microtubule-associated protein light chain 3 (LC3) affinity protects beta cells from lipotoxicity-induced apoptosis [53]. We found that clusterin, a molecular chaperone, binds to LC3 and increases the affinity of LC3 to autophagy-associated factors, and treatment with clusterin significantly repressed beta cell apoptosis through facilitation of the autophagy process in palmitate-induced lipotoxicity conditions (Fig. 1B).
Pancreatic beta cell impairment is a critical risk factor for the onset and progression of T2D. Chronic exposure to FFAs causes lipotoxicity and is the leading cause of beta cell dysfunction, ultimately resulting in T2D. Therefore, a thorough understanding of the metabolism of lipotoxicity is essential for the prevention of beta cell failure and, ultimately, the treatment of T2D. This review discussed the intracellular metabolisms disturbed by lipotoxicity, including alteration of lipid metabolism, inflammatory response, ER stress, and autophagy. In addition, we discussed the possible role of several drugs in correcting broken cellular mechanisms and rescuing beta cells from lipotoxicity. This review supports an understanding of the molecular mechanisms of lipotoxicity-induced beta cell impairment and suggests attractive targets for therapies aimed at preventing beta cell failure, and ultimately treating T2D.

Ethical statements

Not applicable.

Conflicts of interest

The authors have no conflicts of interest to declare.

Funding

None.

Author contributions

Conceptualization: SWH, WYL; Supervision: WYL; Writing–original draft: SWH, WYL; Writing–review&editing: WYL.

All authors read and approved the final manuscript.

Fig. 1.
Summary of lipotoxicity by fatty acids (FAs) and autophagy activation by clusterin. (A) Chronic exposure to FAs induces beta cell dysfunction and apoptosis through cellular lipid synthesis, inflammation, and endoplasmic reticulum (ER) stress. Activated sterol regulatory element-binding protein-1c (SREBP1c) by FAs is translocated to the nucleus and upregulates the expression of fatty acid synthase (Fas) and acetyl-CoA carboxylase-1 (Acc1) for synthesis of cellular lipid. Expression of inflammatory cytokines, including tumor necrosis factor-alpha (TNF-α), interleukin (IL)-6, and IL-1β, is upregulated by c-Jun N-terminal kinase (JNK)/nuclear factor-kappa B (NF-κB) activation, and severe ER stress by FAs ultimately causes the expression of C/EBP homologous protein (CHOP), an apoptotic protein. This alteration of cellular mechanisms is a strong inducer of the apoptosis of pancreatic beta cells. Exendin-4 (Ex-4) or pioglitazone (PIO) showed a strong effect in the rescue of pancreatic beta cells from lipotoxicity. Treatment with Ex-4 maintains lipid metabolism by repressing the activation of SREBP1c. Pioglitazone blocks inflammatory responses repressing JNK/NF-κB activation and decreases CHOP expression mediated by the attenuation of ER stress. Protein kinase RNA-like endoplasmic reticulum kinase (PERK), Activating transcription factor-4 (ATF4), phosphorylated eukaryotic translation initiation factor 2 alpha subunit (pe-IF2α). (B) Autophagy activation protects pancreatic beta cells from lipotoxicity. Clusterin (CLU) facilitates the binding of microtubule-associated protein light chain 3 (LC3) with autophagy-related gene-3 (Atg3) and p62, activating autophagy.
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  • 1. DeFronzo RA. Lilly lecture 1987. The triumvirate: beta-cell, muscle, liver. A collusion responsible for NIDDM. Diabetes 1988;37:667-87.ArticlePubMed
  • 2. Cohrs CM, Panzer JK, Drotar DM, Enos SJ, Kipke N, Chen C, et al. Dysfunction of persisting β cells is a key feature of early type 2 diabetes pathogenesis. Cell Rep 2020;31:107469. ArticlePubMed
  • 3. Carlsson M, Wessman Y, Almgren P, Groop L. High levels of nonesterified fatty acids are associated with increased familial risk of cardiovascular disease. Arterioscler Thromb Vasc Biol 2000;20:1588-94.ArticlePubMed
  • 4. Salgin B, Ong KK, Thankamony A, Emmett P, Wareham NJ, Dunger DB. Higher fasting plasma free fatty acid levels are associated with lower insulin secretion in children and adults and a higher incidence of type 2 diabetes. J Clin Endocrinol Metab 2012;97:3302-9.ArticlePubMed
  • 5. Mahendran Y, Cederberg H, Vangipurapu J, Kangas AJ, Soininen P, Kuusisto J, et al. Glycerol and fatty acids in serum predict the development of hyperglycemia and type 2 diabetes in Finnish men. Diabetes Care 2013;36:3732-8.ArticlePubMedPMC
  • 6. Riserus U, Willett WC, Hu FB. Dietary fats and prevention of type 2 diabetes. Prog Lipid Res 2009;48:44-51.ArticlePubMed
  • 7. Hodge AM, English DR, O'Dea K, Sinclair AJ, Makrides M, Gibson RA, et al. Plasma phospholipid and dietary fatty acids as predictors of type 2 diabetes: interpreting the role of linoleic acid. Am J Clin Nutr 2007;86:189-97.ArticlePubMed
  • 8. Sobczak AI, A Blindauer C, J Stewart A. Changes in plasma free fatty acids associated with type-2 diabetes. Nutrients 2019;11:2022. ArticlePMC
  • 9. Poitout V, Hagman D, Stein R, Artner I, Robertson RP, Harmon JS. Regulation of the insulin gene by glucose and fatty acids. J Nutr 2006;136:873-6.ArticlePubMed
  • 10. Ritz-Laser B, Meda P, Constant I, Klages N, Charollais A, Morales A, et al. Glucose-induced preproinsulin gene expression is inhibited by the free fatty acid palmitate. Endocrinology 1999;140:4005-14.ArticlePubMed
  • 11. Hagman DK, Hays LB, Parazzoli SD, Poitout V. Palmitate inhibits insulin gene expression by altering PDX-1 nuclear localization and reducing MafA expression in isolated rat islets of Langerhans. J Biol Chem 2005;280:32413-8.ArticlePubMed
  • 12. Wang Y, Wang PY, Takashi K. Chronic effects of different non-esterified fatty acids on pancreatic islets of rats. Endocrine 2006;29:169-73.ArticlePubMed
  • 13. Maris M, Robert S, Waelkens E, Derua R, Hernangomez MH, D'Hertog W, et al. Role of the saturated nonesterified fatty acid palmitate in beta cell dysfunction. J Proteome Res 2013;12:347-62.ArticlePubMed
  • 14. Dixon G, Nolan J, McClenaghan NH, Flatt PR, Newsholme P. Arachidonic acid, palmitic acid and glucose are important for the modulation of clonal pancreatic beta-cell insulin secretion, growth and functional integrity. Clin Sci (Lond) 2004;106:191-9.ArticlePubMed
  • 15. El-Assaad W, Buteau J, Peyot ML, Nolan C, Roduit R, Hardy S, et al. Saturated fatty acids synergize with elevated glucose to cause pancreatic beta-cell death. Endocrinology 2003;144:4154-63.ArticlePubMed
  • 16. Acosta-Montano P, Garcia-Gonzalez V. Effects of dietary fatty acids in pancreatic beta cell metabolism, implications in homeostasis. Nutrients 2018;10:393. ArticlePMC
  • 17. Unger RH, Zhou YT. Lipotoxicity of beta-cells in obesity and in other causes of fatty acid spillover. Diabetes 2001;50 Suppl 1:S118-21.ArticlePubMed
  • 18. Maestre I, Jordan J, Calvo S, Reig JA, Cena V, Soria B, et al. Mitochondrial dysfunction is involved in apoptosis induced by serum withdrawal and fatty acids in the beta-cell line INS-1. Endocrinology 2003;144:335-45.ArticlePubMed
  • 19. Piro S, Anello M, Di Pietro C, Lizzio MN, Patane G, Rabuazzo AM, et al. Chronic exposure to free fatty acids or high glucose induces apoptosis in rat pancreatic islets: possible role of oxidative stress. Metabolism 2002;51:1340-7.ArticlePubMed
  • 20. Weir GC, Bonner-Weir S. Five stages of evolving beta-cell dysfunction during progression to diabetes. Diabetes 2004;53 Suppl 3:S16-21.ArticlePubMed
  • 21. Karaskov E, Scott C, Zhang L, Teodoro T, Ravazzola M, Volchuk A. Chronic palmitate but not oleate exposure induces endoplasmic reticulum stress, which may contribute to INS-1 pancreatic beta-cell apoptosis. Endocrinology 2006;147:3398-407.ArticlePubMed
  • 22. Shimabukuro M, Zhou YT, Levi M, Unger RH. Fatty acid-induced beta cell apoptosis: a link between obesity and diabetes. Proc Natl Acad Sci U S A 1998;95:2498-502.ArticlePubMedPMC
  • 23. Unger RH, Orci L. Lipoapoptosis: its mechanism and its diseases. Biochim Biophys Acta 2002;1585:202-12.ArticlePubMed
  • 24. Horton JD, Goldstein JL, Brown MS. SREBPs: activators of the complete program of cholesterol and fatty acid synthesis in the liver. J Clin Invest 2002;109:1125-31.ArticlePubMedPMC
  • 25. Brown MS, Goldstein JL. The SREBP pathway: regulation of cholesterol metabolism by proteolysis of a membrane-bound transcription factor. Cell 1997;89:331-40.ArticlePubMed
  • 26. Amemiya-Kudo M, Shimano H, Hasty AH, Yahagi N, Yoshikawa T, Matsuzaka T, et al. Transcriptional activities of nuclear SREBP-1a, -1c, and -2 to different target promoters of lipogenic and cholesterogenic genes. J Lipid Res 2002;43:1220-35.ArticlePubMed
  • 27. Pai JT, Guryev O, Brown MS, Goldstein JL. Differential stimulation of cholesterol and unsaturated fatty acid biosynthesis in cells expressing individual nuclear sterol regulatory element-binding proteins. J Biol Chem 1998;273:26138-48.ArticlePubMed
  • 28. Tovar AR, Torre-Villalvazo I, Ochoa M, Elias AL, Ortiz V, Aguilar-Salinas CA, et al. Soy protein reduces hepatic lipotoxicity in hyperinsulinemic obese Zucker fa/fa rats. J Lipid Res 2005;46:1823-32.ArticlePubMed
  • 29. Kakuma T, Lee Y, Higa M, Wang Zw, Pan W, Shimomura I, et al. Leptin, troglitazone, and the expression of sterol regulatory element binding proteins in liver and pancreatic islets. Proc Natl Acad Sci U S A 2000;97:8536-41.ArticlePubMedPMC
  • 30. Hong SW, Lee J, Park SE, Rhee EJ, Park CY, Oh KW, et al. Repression of sterol regulatory element-binding protein 1-c is involved in the protective effects of exendin-4 in pancreatic β-cell line. Mol Cell Endocrinol 2012;362:242-52.ArticlePubMed
  • 31. Larsen CM, Faulenbach M, Vaag A, Volund A, Ehses JA, Seifert B, et al. Interleukin-1-receptor antagonist in type 2 diabetes mellitus. N Engl J Med 2007;356:1517-26.ArticlePubMed
  • 32. Cai K, Qi D, Wang O, Chen J, Liu X, Deng B, et al. TNF-α acutely upregulates amylin expression in murine pancreatic beta cells. Diabetologia 2011;54:617-26.ArticlePubMed
  • 33. Montane J, Klimek-Abercrombie A, Potter KJ, Westwell-Roper C, Bruce Verchere C. Metabolic stress, IAPP and islet amyloid. Diabetes Obes Metab 2012;14 Suppl 3:68-77.ArticlePubMed
  • 34. Masters SL, Dunne A, Subramanian SL, Hull RL, Tannahill GM, Sharp FA, et al. Activation of the NLRP3 inflammasome by islet amyloid polypeptide provides a mechanism for enhanced IL-1β in type 2 diabetes. Nat Immunol 2010;11:897-904.ArticlePubMedPMC
  • 35. van Raalte DH, Diamant M. Glucolipotoxicity and beta cells in type 2 diabetes mellitus: target for durable therapy? Diabetes Res Clin Pract 2011;93 Suppl 1:S37-46.ArticlePubMed
  • 36. Yung J, Giacca A. Role of c-Jun N-terminal Kinase (JNK) in obesity and type 2 diabetes. Cells 2020;9:706. ArticlePMC
  • 37. Igoillo-Esteve M, Marselli L, Cunha DA, Ladriere L, Ortis F, Grieco FA, et al. Palmitate induces a pro-inflammatory response in human pancreatic islets that mimics CCL2 expression by beta cells in type 2 diabetes. Diabetologia 2010;53:1395-405.ArticlePubMed
  • 38. Nakatani Y, Kaneto H, Kawamori D, Yoshiuchi K, Hatazaki M, Matsuoka TA, et al. Involvement of endoplasmic reticulum stress in insulin resistance and diabetes. J Biol Chem 2005;280:847-51.ArticlePubMed
  • 39. Marchetti P, Bugliani M, Lupi R, Marselli L, Masini M, Boggi U, et al. The endoplasmic reticulum in pancreatic beta cells of type 2 diabetes patients. Diabetologia 2007;50:2486-94.ArticlePubMed
  • 40. Laybutt DR, Preston AM, Akerfeldt MC, Kench JG, Busch AK, Biankin AV, et al. Endoplasmic reticulum stress contributes to beta cell apoptosis in type 2 diabetes. Diabetologia 2007;50:752-63.ArticlePubMed
  • 41. Johnson JD. Proteomic identification of carboxypeptidase E connects lipid-induced beta-cell apoptosis and dysfunction in type 2 diabetes. Cell Cycle 2009;8:38-42.Article
  • 42. Li G, Mongillo M, Chin KT, Harding H, Ron D, Marks AR, et al. Role of ERO1-alpha-mediated stimulation of inositol 1,4,5-triphosphate receptor activity in endoplasmic reticulum stress-induced apoptosis. J Cell Biol 2009;186:783-92.Article
  • 43. Hong SW, Lee J, Cho JH, Kwon H, Park SE, Rhee EJ, et al. Pioglitazone attenuates palmitate-induced inflammation and endoplasmic reticulum stress in pancreatic β-cells. Endocrinol Metab (Seoul) 2018;33:105-13.Article
  • 44. Pistrosch F, Passauer J, Fischer S, Fuecker K, Hanefeld M, Gross P. In type 2 diabetes, rosiglitazone therapy for insulin resistance ameliorates endothelial dysfunction independent of glucose control. Diabetes Care 2004;27:484-90.Article
  • 45. Gong L, Jin H, Li Y, Quan Y, Yang J, Tang Q, et al. Rosiglitazone ameliorates skeletal muscle insulin resistance by decreasing free fatty acids release from adipocytes. Biochem Biophys Res Commun 2020;533:1122-8.Article
  • 46. Ishida H, Takizawa M, Ozawa S, Nakamichi Y, Yamaguchi S, Katsuta H, et al. Pioglitazone improves insulin secretory capacity and prevents the loss of beta-cell mass in obese diabetic db/db mice: possible protection of beta cells from oxidative stress. Metabolism 2004;53:488-94.Article
  • 47. Lin CY, Gurlo T, Haataja L, Hsueh WA, Butler PC. Activation of peroxisome proliferator-activated receptor-gamma by rosiglitazone protects human islet cells against human islet amyloid polypeptide toxicity by a phosphatidylinositol 3'-kinase-dependent pathway. J Clin Endocrinol Metab 2005;90:6678-86.Article
  • 48. Ebato C, Uchida T, Arakawa M, Komatsu M, Ueno T, Komiya K, et al. Autophagy is important in islet homeostasis and compensatory increase of beta cell mass in response to high-fat diet. Cell Metab 2008;8:325-32.Article
  • 49. Choi SE, Lee SM, Lee YJ, Li LJ, Lee SJ, Lee JH, et al. Protective role of autophagy in palmitate-induced INS-1 beta-cell death. Endocrinology 2009;150:126-34.Article
  • 50. Mandrup-Poulsen T, Egeberg J, Nerup J, Bendtzen K, Nielsen JH, Dinarello CA. Ultrastructural studies of time-course and cellular specificity of interleukin-1 mediated islet cytotoxicity. Acta Pathol Microbiol Immunol Scand C 1987;95:55-63.Article
  • 51. Kaniuk NA, Kiraly M, Bates H, Vranic M, Volchuk A, Brumell JH. Ubiquitinated-protein aggregates form in pancreatic beta-cells during diabetes-induced oxidative stress and are regulated by autophagy. Diabetes 2007;56:930-9.Article
  • 52. Jung HS, Chung KW, Won Kim J, Kim J, Komatsu M, Tanaka K, et al. Loss of autophagy diminishes pancreatic beta cell mass and function with resultant hyperglycemia. Cell Metab 2008;8:318-24.Article
  • 53. Hong SW, Lee J, Kim MJ, Moon SJ, Kwon H, Park SE, et al. Clusterin protects lipotoxicity-induced apoptosis via upregulation of autophagy in insulin-secreting cells. Endocrinol Metab (Seoul) 2020;35:943-53.Article

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