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EP3 signaling is decoupled from the regulation of glucose-stimulated insulin secretion in β-cells compensating for obesity and insulin resistance. EP3信号与补偿肥胖和胰岛素抵抗的β细胞中葡萄糖刺激的胰岛素分泌的调节脱钩。
IF 1.9 4区 医学
Islets Pub Date : 2023-12-31 DOI: 10.1080/19382014.2023.2223327
Michael D Schaid, Jeffrey M Harrington, Grant M Kelly, Sophia M Sdao, Matthew J Merrins, Michelle E Kimple
{"title":"EP3 signaling is decoupled from the regulation of glucose-stimulated insulin secretion in β-cells compensating for obesity and insulin resistance.","authors":"Michael D Schaid, Jeffrey M Harrington, Grant M Kelly, Sophia M Sdao, Matthew J Merrins, Michelle E Kimple","doi":"10.1080/19382014.2023.2223327","DOIUrl":"10.1080/19382014.2023.2223327","url":null,"abstract":"<p><p>Of the β-cell signaling pathways altered by obesity and insulin resistance, some are adaptive while others contribute to β-cell failure. Two critical second messengers are Ca<sup>2+</sup> and cAMP, which control the timing and amplitude of insulin secretion. Previous work has shown the importance of the cAMP-inhibitory Prostaglandin EP3 receptor (EP3) in mediating the β-cell dysfunction of type 2 diabetes (T2D). Here, we used three groups of C57BL/6J mice as a model of the progression from metabolic health to T2D: wildtype, normoglycemic <i>Leptin</i><sup><i>Ob</i></sup> (NGOB), and hyperglycemic <i>Leptin</i><sup><i>Ob</i></sup> (HGOB). Robust increases in β-cell cAMP and insulin secretion were observed in NGOB islets as compared to wildtype controls; an effect lost in HGOB islets, which exhibited reduced β-cell cAMP and insulin secretion despite increased glucose-dependent Ca<sup>2+</sup> influx. An EP3 antagonist had no effect on β-cell cAMP or Ca<sup>2+</sup> oscillations, demonstrating agonist-independent EP3 signaling. Finally, using sulprostone to hyperactivate EP3 signaling, we found EP3-dependent suppression of β-cell cAMP and Ca<sup>2+</sup> duty cycle effectively reduces insulin secretion in HGOB islets, while having no impact insulin secretion on NGOB islets, despite similar and robust effects on cAMP levels and Ca<sup>2+</sup> duty cycle. Finally, increased cAMP levels in NGOB islets are consistent with increased recruitment of the small G protein, Rap1GAP, to the plasma membrane, sequestering the EP3 effector, Gɑ<sub>z</sub>, from inhibition of adenylyl cyclase. Taken together, these results suggest that rewiring of EP3 receptor-dependent cAMP signaling contributes to the progressive changes in β cell function observed in the <i>Leptin</i><sup><i>Ob</i></sup> model of diabetes.</p>","PeriodicalId":14671,"journal":{"name":"Islets","volume":"15 1","pages":"2223327"},"PeriodicalIF":1.9,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10332234/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9796206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A primer on modelling pancreatic islets: from models of coupled β-cells to multicellular islet models. 胰岛模型入门:从偶联β细胞模型到多细胞胰岛模型。
IF 1.9 4区 医学
Islets Pub Date : 2023-12-31 DOI: 10.1080/19382014.2023.2231609
Gerardo J Félix-Martínez, J Rafael Godínez-Fernández
{"title":"A primer on modelling pancreatic islets: from models of coupled β-cells to multicellular islet models.","authors":"Gerardo J Félix-Martínez, J Rafael Godínez-Fernández","doi":"10.1080/19382014.2023.2231609","DOIUrl":"10.1080/19382014.2023.2231609","url":null,"abstract":"<p><p>Pancreatic islets are mini-organs composed of hundreds or thousands of ɑ, β and δ-cells, which, respectively, secrete glucagon, insulin and somatostatin, key hormones for the regulation of blood glucose. In pancreatic islets, hormone secretion is tightly regulated by both internal and external mechanisms, including electrical communication and paracrine signaling between islet cells. Given its complexity, the experimental study of pancreatic islets has been complemented with computational modeling as a tool to gain a better understanding about how all the mechanisms involved at different levels of organization interact. In this review, we describe how multicellular models of pancreatic cells have evolved from the early models of electrically coupled β-cells to models in which experimentally derived architectures and both electrical and paracrine signals have been considered.</p>","PeriodicalId":14671,"journal":{"name":"Islets","volume":"15 1","pages":"2231609"},"PeriodicalIF":1.9,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/24/77/KISL_15_2231609.PMC10332213.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9805249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The causal relationship between bacterial pneumonia and diabetes: a two-sample mendelian randomization study 细菌性肺炎与糖尿病之间的因果关系:双样本泯灭随机研究
IF 2.2 4区 医学
Islets Pub Date : 2023-12-14 DOI: 10.1080/19382014.2023.2291885
Songying Pan, Zhongqi Zhang, Weiyi Pang
{"title":"The causal relationship between bacterial pneumonia and diabetes: a two-sample mendelian randomization study","authors":"Songying Pan, Zhongqi Zhang, Weiyi Pang","doi":"10.1080/19382014.2023.2291885","DOIUrl":"https://doi.org/10.1080/19382014.2023.2291885","url":null,"abstract":"The escalating worldwide occurrence of diabetes mellitus, recognized as a chronic metabolic ailment contributing to an amplified global disease burden, has stimulated researchers to explore its eti...","PeriodicalId":14671,"journal":{"name":"Islets","volume":"38 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138628461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Species-dependent impact of immunosuppressive squalene-gusperimus nanoparticles and adipose-derived stem cells on isolated human and rat pancreatic islets. 免疫抑制角鲨烯-谷氨酸纳米颗粒和脂肪来源的干细胞对分离的人和大鼠胰岛的物种依赖性影响。
IF 2.2 4区 医学
Islets Pub Date : 2022-12-31 DOI: 10.1080/19382014.2022.2100191
Carlos E Navarro Chica, Tian Qin, Erika Pinheiro-Machado, Bart J de Haan, M M Faas, Alexandra M Smink, Ligia Sierra, Betty L López, Paul de Vos
{"title":"Species-dependent impact of immunosuppressive squalene-gusperimus nanoparticles and adipose-derived stem cells on isolated human and rat pancreatic islets.","authors":"Carlos E Navarro Chica,&nbsp;Tian Qin,&nbsp;Erika Pinheiro-Machado,&nbsp;Bart J de Haan,&nbsp;M M Faas,&nbsp;Alexandra M Smink,&nbsp;Ligia Sierra,&nbsp;Betty L López,&nbsp;Paul de Vos","doi":"10.1080/19382014.2022.2100191","DOIUrl":"https://doi.org/10.1080/19382014.2022.2100191","url":null,"abstract":"<p><p>Transplantation of pancreatic islets is a promising approach to controlling glucose levels in type 1 diabetes mellitus (T1DM), but islet survival is still limited. To overcome this, islet co-culture with mesenchymal stromal cells (MSCs) together with safe immunosuppressive agents like squalene-gusperimus nanoparticles (Sq-GusNPs) may be applied. This could support islet survival and engraftment. Here, we studied how Sq-GusNPs and adipose-derived stem cells (ASCs) influence islets response under pro-inflammatory conditions. Through qRT-PCR, we studied the expression of specific genes at 24 hours in human and rat islets and ASCs in co-culture under indirect contact with or without treatment with Sq-GusNPs. We characterized how the response of islets and ASCs starts at molecular level before impaired viability or function is observed and how this response differs between species. Human islets and ASCs responses showed to be principally influenced by NF-κB activation, whereas rat islet and ASCs responses showed to be principally mediated by nitrosative stress. Rat islets showed tolerance to inflammatory conditions due to IL-1Ra secretion which was also observed in rat ASCs. Human islets induced the expression of cytokines and chemokines with pro-angiogenic, tissue repair, and anti-apoptotic properties in human ASCs under basal conditions. This expression was not inhibited by Sq-GusNPs. Our results showed a clear difference in the response elicited by human and rat islets and ASCs in front of an inflammatory stimulus and Sq-GusNPs. Our data support the use of ASCs and Sq-GusNP to facilitate engraftment of islets for T1DM treatment.</p>","PeriodicalId":14671,"journal":{"name":"Islets","volume":" ","pages":"164-183"},"PeriodicalIF":2.2,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9291694/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40507811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Mesenchymal Stem Cells Secretions Enhanced ATP Generation on Isolated Islets during Transplantation. 间充质干细胞分泌增强离体胰岛移植过程中ATP的生成。
IF 2.2 4区 医学
Islets Pub Date : 2022-12-31 DOI: 10.1080/19382014.2021.2022423
Takumi Teratani, Naoya Kasahara, Yasuhiro Fujimoto, Yasunaru Sakuma, Atsushi Miki, Masafumi Goto, Naohiro Sata, Joji Kitayama
{"title":"Mesenchymal Stem Cells Secretions Enhanced ATP Generation on Isolated Islets during Transplantation.","authors":"Takumi Teratani,&nbsp;Naoya Kasahara,&nbsp;Yasuhiro Fujimoto,&nbsp;Yasunaru Sakuma,&nbsp;Atsushi Miki,&nbsp;Masafumi Goto,&nbsp;Naohiro Sata,&nbsp;Joji Kitayama","doi":"10.1080/19382014.2021.2022423","DOIUrl":"https://doi.org/10.1080/19382014.2021.2022423","url":null,"abstract":"<p><p>The success of islet transplantation in both basic research and clinical settings has proven that cell therapy has the potential to cure diabetes. Islets intended for transplantation are inevitably subjected to damage from a number of sources, including ischemic injury during removal and delivery of the donor pancreas, enzymatic digestion during islet isolation, and reperfusion injury after transplantation in the recipient. Here, we found that protein factors secreted by porcine adipose-tissue mesenchymal stem cells (AT-MSCs) were capable of activating preserved porcine islets. A conditioned medium was prepared from the supernatant obtained by culturing porcine AT-MSCs for 2 days in serum-free medium. Islets were preserved at 4°C in University of Wisconsin solution during transportation and then incubated at 37°C in RPMI-1620 medium with fractions of various molecular weights prepared from the conditioned medium. After treatment with certain fractions of the AT-MSC secretions, the intracellular ATP levels of the activated islets had increased to over 160% of their initial values after 4 days of incubation. Our novel system may be able to restore the condition of isolated islets after transportation or preservation and may help to improve the long-term outcome of islet transplantation.<b>Abbreviations:</b> AT-MSC, adipose-tissue mesenchymal stem cell; Cas-3, caspase-3; DAPI, 4,6-diamidino-2-phenylindole; DTZ, dithizone; ES cell, embryonic stem cell; FITC, fluorescein isothiocyanate; IEQ, islet equivalent; INS, insulin; iPS cell, induced pluripotent stem cell; Luc-Tg rat, luciferase-transgenic rat; PCNA, proliferating cell nuclear antigen; PDX1, pancreatic and duodenal homeobox protein-1; UW, University of Wisconsin; ZO1, zona occludens 1.</p>","PeriodicalId":14671,"journal":{"name":"Islets","volume":" ","pages":"69-81"},"PeriodicalIF":2.2,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/9f/55/KISL_14_2022423.PMC8765074.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39824644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Genome-edited zebrafish model of ABCC8 loss-of-function disease. ABCC8功能丧失疾病的基因组编辑斑马鱼模型。
IF 2.2 4区 医学
Islets Pub Date : 2022-12-31 DOI: 10.1080/19382014.2022.2149206
Jennifer M Ikle, Robert C Tryon, Soma S Singareddy, Nathaniel W York, Maria S Remedi, Colin G Nichols
{"title":"Genome-edited zebrafish model of <i>ABCC8</i> loss-of-function disease.","authors":"Jennifer M Ikle,&nbsp;Robert C Tryon,&nbsp;Soma S Singareddy,&nbsp;Nathaniel W York,&nbsp;Maria S Remedi,&nbsp;Colin G Nichols","doi":"10.1080/19382014.2022.2149206","DOIUrl":"10.1080/19382014.2022.2149206","url":null,"abstract":"<p><p>ATP-sensitive potassium channel (K<sub>ATP</sub>)gain- (GOF) and loss-of-function (LOF) mutations underlie human neonatal diabetes mellitus (NDM) and hyperinsulinism (HI), respectively. While transgenic mice expressing incomplete K<sub>ATP</sub> LOF do reiterate mild hyperinsulinism, K<sub>ATP</sub> knockout animals do not exhibit persistent hyperinsulinism. We have shown that islet excitability and glucose homeostasis are regulated by identical K<sub>ATP</sub> channels in zebrafish. SUR1 truncation mutation (K499X) was introduced into <i>the abcc8</i> gene to explore the possibility of using zebrafish for modeling human HI. Patch-clamp analysis confirmed the complete absence of channel activity in β-cells from K499X (SUR1<sup>-/-</sup>) fish. No difference in random blood glucose was detected in heterozygous SUR1+/- fish nor in homozygous SUR1<sup>-/-</sup> fish, mimicking findings in SUR1 knockout mice. Mutant fish did, however, demonstrate impaired glucose tolerance, similar to partial LOF mouse models. In paralleling features of mammalian diabetes and hyperinsulinism resulting from equivalent LOF mutations, these gene-edited animals provide valid zebrafish models of K<sub>ATP</sub> -dependent pancreatic diseases.</p>","PeriodicalId":14671,"journal":{"name":"Islets","volume":"14 1","pages":"200-209"},"PeriodicalIF":2.2,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9721409/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9115695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Stabilization protects islet integrity during respirometry in the Oroboros Oxygraph-2K analyzer. 稳定保护胰岛完整性在Oroboros Oxygraph-2K分析仪呼吸测量。
IF 2.2 4区 医学
Islets Pub Date : 2022-12-31 DOI: 10.1080/19382014.2022.2054251
Justin J Crowder, Ziqian Zeng, Alissa N Novak, Nathan J Alves, Amelia K Linnemann
{"title":"Stabilization protects islet integrity during respirometry in the Oroboros Oxygraph-2K analyzer.","authors":"Justin J Crowder,&nbsp;Ziqian Zeng,&nbsp;Alissa N Novak,&nbsp;Nathan J Alves,&nbsp;Amelia K Linnemann","doi":"10.1080/19382014.2022.2054251","DOIUrl":"https://doi.org/10.1080/19382014.2022.2054251","url":null,"abstract":"<p><p>Metabolic dysfunction of β-cells has been implicated as a contributor to diabetes pathogenesis, and efforts are ongoing to optimize analytical techniques that evaluate islet metabolism. High-resolution respirometry offers sensitive measurements of the respiratory effects of metabolic substrates and customizable manipulation of electron transport chain components, though the delicate nature of islets can pose challenges to conventional analyses. An affordable and reliable option for respirometry is the Oroboros Oxygraph-2 K system, which utilizes a stir bar to circulate reagents around cells. While this technique may be suitable for individual cells or mitochondria, the continual force exerted by the stir bar can have damaging effects on islet integrity. Herein, we demonstrate the protective benefits of a novel 3D-printed islet stabilization device and highlight the destructive effects of conventional Oxygraph analysis on islet integrity. Islet containment did not inhibit cellular responses to metabolic modulatory drugs, as indicated by robust fluctuations in oxygen consumption rates. The average size of wild-type mouse islets was significantly reduced following a standard Mito Stress Test within Oxygraph chambers, with a clear disruption in islet morphology and viability. Alternatively, containment of the islets within the interior chamber of the islet stabilization device yielded preservation of both islet morphology and increased cell viability/survival after respirometry analysis. Collectively, our study introduces a new and easily accessible tool to improve conventional Oxygraph respirometry of pancreatic islets by preserving natural islet structure and function throughout metabolic analysis.</p>","PeriodicalId":14671,"journal":{"name":"Islets","volume":" ","pages":"128-138"},"PeriodicalIF":2.2,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8959522/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40325753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Impact of biotin supplemented diet on mouse pancreatic islet β-cell mass expansion and glucose induced electrical activity. 添加生物素对小鼠胰岛β细胞增殖和葡萄糖诱导的电活动的影响。
IF 2.2 4区 医学
Islets Pub Date : 2022-12-31 DOI: 10.1080/19382014.2022.2091886
Israel Morales-Reyes, Illani Atwater, Marcelino Esparza-Aguilar, E Martha Pérez-Armendariz
{"title":"Impact of biotin supplemented diet on mouse pancreatic islet β-cell mass expansion and glucose induced electrical activity.","authors":"Israel Morales-Reyes,&nbsp;Illani Atwater,&nbsp;Marcelino Esparza-Aguilar,&nbsp;E Martha Pérez-Armendariz","doi":"10.1080/19382014.2022.2091886","DOIUrl":"https://doi.org/10.1080/19382014.2022.2091886","url":null,"abstract":"<p><p>Biotin supplemented diet (BSD) is known to enhance β-cell replication and insulin secretion in mice. Here, we first describe BSD impact on the islet β-cell membrane potential (Vm) and glucose-induced electrical activity. BALB/c female mice (n ≥ 20) were fed for nine weeks after weaning with a control diet (CD) or a BSD (100X). In both groups, islet area was compared in pancreatic sections incubated with anti-insulin and anti-glucagon antibodies; Vm was recorded in micro dissected islet β-cells during perfusion with saline solutions containing 2.8, 5.0, 7.5-, or 11.0 mM glucose. BSD increased the islet and β-cell area compared with CD. In islet β-cells of the BSD group, a larger ΔVm/Δ[glucose] was found at sub-stimulatory glucose concentrations and the threshold glucose concentration for generation of action potentials (APs) was increased by 1.23 mM. Moreover, at 11.0 mM glucose, a significant decrease was found in AP amplitude, frequency, ascending and descending slopes as well as in the calculated net charge influx and efflux of islet β-cells from BSD compared to the CD group, without changes in slow Vm oscillation parameters. A pharmacological dose of biotin in mice increases islet insulin cell mass, shifts islet β-cell intracellular electrical activity dose response curve toward higher glucose concentrations, very likely by increasing K<sub>ATP</sub> conductance, and decreases voltage gated Ca<sup>2+</sup> and K<sup>+</sup> conductance at stimulatory glucose concentrations.</p>","PeriodicalId":14671,"journal":{"name":"Islets","volume":"14 1","pages":"149-163"},"PeriodicalIF":2.2,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/91/f2/KISL_14_2091886.PMC9733685.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10382526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Molecular mechanism analysis of m6A modification-related lncRNA-miRNA-mRNA network in regulating autophagy in acute pancreatitis. m6A修饰相关lncRNA-miRNA-mRNA网络调控急性胰腺炎自噬的分子机制分析。
IF 2.2 4区 医学
Islets Pub Date : 2022-12-31 DOI: 10.1080/19382014.2022.2132099
Xiang Li, Hong Qin, Ali Anwar, Xingwen Zhang, Fang Yu, Zheng Tan, Zhanhong Tang
{"title":"Molecular mechanism analysis of m6A modification-related lncRNA-miRNA-mRNA network in regulating autophagy in acute pancreatitis.","authors":"Xiang Li,&nbsp;Hong Qin,&nbsp;Ali Anwar,&nbsp;Xingwen Zhang,&nbsp;Fang Yu,&nbsp;Zheng Tan,&nbsp;Zhanhong Tang","doi":"10.1080/19382014.2022.2132099","DOIUrl":"https://doi.org/10.1080/19382014.2022.2132099","url":null,"abstract":"<p><p>This study aims to explore the molecular mechanism of N6-methyladenosine (m6A) modification-related long noncoding RNA (lncRNA)-microRNA (miRNA)-messenger RNA (mRNA) network in regulating autophagy and affecting the occurrence and development of acute pancreatitis (AP). RNA-seq datasets related to AP were obtained from Gene Expression Omnibus (GEO) database and merged after batch effect removal. lncRNAs significantly related to m6A in AP, namely candidate lncRNA, were screened by correlation analysis and differential expression analysis. In addition, candidate autophagy genes were screened through the multiple databases. Furthermore, the key pathways for autophagy to play a role in AP were determined by functional enrichment analysis. Finally, we predicted the miRNAs binding to genes and lncRNAs through TargetScan, miRDB and DIANA TOOLS databases and constructed two types of lncRNA-miRNA-mRNA regulatory networks mediated by upregulated and downregulated lncRNAs in AP. Nine lncRNAs related to m6A were differentially expressed in AP, and 21 candidate autophagy genes were obtained. Phosphoinositide 3-kinase (PI3K)-Akt signaling pathway and Forkhead box O (FoxO) signaling pathway might be the key pathways for autophagy to play a role in AP. Finally, we constructed a lncRNA-miRNA-mRNA regulatory network. An upregulated lncRNA competitively binds to 13 miRNAs to regulate 6 autophagy genes, and a lncRNA-miRNA-mRNA regulatory network in which 2 downregulated lncRNAs competitively bind to 7 miRNAs to regulate 2 autophagy genes. m6A modification-related lncRNA Pvt1, lncRNA Meg3 and lncRNA AW112010 may mediate the lncRNA-miRNA-mRNA network, thereby regulating autophagy to affect the development of AP.</p>","PeriodicalId":14671,"journal":{"name":"Islets","volume":" ","pages":"184-199"},"PeriodicalIF":2.2,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9559333/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"33499555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Misrouting of glucagon and stathmin-2 towards lysosomal system of α-cells in glucagon hypersecretion of diabetes. 糖尿病胰高血糖素高分泌中胰高血糖素和凝血素-2向α-细胞溶酶体系统的错误路径。
IF 2.2 4区 医学
Islets Pub Date : 2022-12-31 DOI: 10.1080/19382014.2021.2011550
Farzad Asadi, Savita Dhanvantari
{"title":"Misrouting of glucagon and stathmin-2 towards lysosomal system of α-cells in glucagon hypersecretion of diabetes.","authors":"Farzad Asadi,&nbsp;Savita Dhanvantari","doi":"10.1080/19382014.2021.2011550","DOIUrl":"https://doi.org/10.1080/19382014.2021.2011550","url":null,"abstract":"Glucagon hypersecretion from the pancreatic α-cell is a characteristic sign of diabetes, which exacerbates fasting hyperglycemia. Thus, targeting glucagon secretion from α-cells may be a promising approach for combating hyperglucagonemia. We have recently identified stathmin-2 as a protein that resides in α-cell secretory granules, and showed that it regulates glucagon secretion by directing glucagon towards the endolysosomal system in αTC1-6 cells. Here, we hypothesized that disruption of Stmn2-mediated trafficking of glucagon to the endolysosomes contributes to hyperglucagonemia. In isolated islets from male mice treated with streptozotocin (STZ) to induce diabetes, Arg-stimulated secretion of glucagon and Stmn2 was augmented. However, cell glucagon content was significantly increased (p<0.001), but Stmn2 levels were reduced (p<0.01) in STZ-treated mice, as measured by both ELISA and immunofluorescence intensity. Expression of Gcg mRNA increased ~4.5 times, while Stmn2 mRNA levels did not change. Using confocal immunofluorescence microscopy, the colocalization of glucagon and Stmn2 in Lamp2A+ lysosomes was dramatically reduced (p<0.001) in islets from diabetic mice, and the colocalization of Stmn2, but not glucagon, with the late endosome marker, Rab7, significantly (p<0.01) increased. Further studies were conducted in αTC1-6 cells cultured in media containing high glucose (16.7 mM) for two weeks to mimic glucagon hypersecretion of diabetes. Surprisingly, treatment of αTC1-6 cells with the lysosomal inhibitor bafilomycin A1 reduced K+-induced glucagon secretion, suggesting that high glucose may induce glucagon secretion from another lysosomal compartment. Both glucagon and Stmn2 co-localized with Lamp1, which marks secretory lysosomes, in cells cultured in high glucose. We propose that, in addition to enhanced trafficking and secretion through the regulated secretory pathway, the hyperglucagonemia of diabetes may also be due to re-routing of glucagon from the degradative Lamp2A+ lysosome towards the secretory Lamp1+lysosome.","PeriodicalId":14671,"journal":{"name":"Islets","volume":" ","pages":"40-57"},"PeriodicalIF":2.2,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8726656/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39737716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
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