Diabetes & Metabolism Journal

Reviews

Basic Research
Mitochondrial Stress and Mitokines: Therapeutic Perspectives for the Treatment of Metabolic Diseases: Benyuan Zhang, Joon Young Chang, Min Hee Lee, Sang-Hyeon Ju, Hyon-Seung Yi, Minho Shong; Diabetes Metab J. 2024;48(1):1-18. Published online January 3, 2024; DOI: https://doi.org/10.4093/dmj.2023.0115

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Mitochondrial stress and the dysregulated mitochondrial unfolded protein response (UPR^mt) are linked to various diseases, including metabolic disorders, neurodegenerative diseases, and cancer. Mitokines, signaling molecules released by mitochondrial stress response and UPR^mt, are crucial mediators of inter-organ communication and influence systemic metabolic and physiological processes. In this review, we provide a comprehensive overview of mitokines, including their regulation by exercise and lifestyle interventions and their implications for various diseases. The endocrine actions of mitokines related to mitochondrial stress and adaptations are highlighted, specifically the broad functions of fibroblast growth factor 21 and growth differentiation factor 15, as well as their specific actions in regulating inter-tissue communication and metabolic homeostasis. Finally, we discuss the potential of physiological and genetic interventions to reduce the hazards associated with dysregulated mitokine signaling and preserve an equilibrium in mitochondrial stress-induced responses. This review provides valuable insights into the mechanisms underlying mitochondrial regulation of health and disease by exploring mitokine interactions and their regulation, which will facilitate the development of targeted therapies and personalized interventions to improve health outcomes and quality of life.

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Mitochondria: fundamental characteristics, challenges, and impact on aging
Runyu Liang, Luwen Zhu, Yongyin Huang, Jia Chen, Qiang Tang
Biogerontology.2024;[Epub] CrossRef

Basic Research
Heterogeneity of Islet Cells during Embryogenesis and Differentiation: Shugo Sasaki, Takeshi Miyatsuka; Diabetes Metab J. 2023;47(2):173-184. Published online January 12, 2023; DOI: https://doi.org/10.4093/dmj.2022.0324

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Abstract PDF PubReader ePub

Diabetes is caused by insufficient insulin secretion due to β-cell dysfunction and/or β-cell loss. Therefore, the restoration of functional β-cells by the induction of β-cell differentiation from embryonic stem (ES) and induced-pluripotent stem (iPS) cells, or from somatic non-β-cells, may be a promising curative therapy. To establish an efficient and feasible method for generating functional insulin-producing cells, comprehensive knowledge of pancreas development and β-cell differentiation, including the mechanisms driving cell fate decisions and endocrine cell maturation is crucial. Recent advances in single-cell RNA sequencing (scRNA-seq) technologies have opened a new era in pancreas development and diabetes research, leading to clarification of the detailed transcriptomes of individual insulin-producing cells. Such extensive high-resolution data enables the inference of developmental trajectories during cell transitions and gene regulatory networks. Additionally, advancements in stem cell research have not only enabled their immediate clinical application, but also has made it possible to observe the genetic dynamics of human cell development and maturation in a dish. In this review, we provide an overview of the heterogeneity of islet cells during embryogenesis and differentiation as demonstrated by scRNA-seq studies on the developing and adult pancreata, with implications for the future application of regenerative medicine for diabetes.

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Newly discovered knowledge pertaining to glucagon and its clinical applications
Dan Kawamori, Shugo Sasaki
Journal of Diabetes Investigation.2023; 14(7): 829. CrossRef

Original Articles

Basic Research
Differentiation of Microencapsulated Neonatal Porcine Pancreatic Cell Clusters in Vitro Improves Transplant Efficacy in Type 1 Diabetes Mellitus Mice: Gyeong-Jin Cheon, Heon-Seok Park, Eun-Young Lee, Min Jung Kim, Young-Hye You, Marie Rhee, Ji-Won Kim, Kun-Ho Yoon; Diabetes Metab J. 2022;46(5):677-688. Published online February 7, 2022; DOI: https://doi.org/10.4093/dmj.2021.0202

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Background
Neonatal porcine pancreatic cell clusters (NPCCs) have been proposed as an alternative source of β cells for islet transplantation because of their low cost and growth potential after transplantation. However, the delayed glucose lowering effect due to the immaturity of NPCCs and immunologic rejection remain as a barrier to NPCC’s clinical application. Here, we demonstrate accelerated differentiation and immune-tolerant NPCCs by in vitro chemical treatment and microencapsulation.
Methods
NPCCs isolated from 3-day-old piglets were cultured in F-10 media and then microencapsulated with alginate on day 5. Differentiation of NPCCs is facilitated by media supplemented with activin receptor-like kinase 5 inhibitor II, triiodothyronine and exendin-4 for 2 weeks. Marginal number of microencapsulated NPCCs to cure diabetes with and without differentiation were transplanted into diabetic mice and observed for 8 weeks.
Results
The proportion of insulin-positive cells and insulin mRNA levels of NPCCs were significantly increased in vitro in the differentiated group compared with the undifferentiated group. Blood glucose levels decreased eventually after transplantation of microencapsulated NPCCs in diabetic mice and normalized after 7 weeks in the differentiated group. In addition, the differentiated group showed nearly normal glucose tolerance at 8 weeks after transplantation. In contrast, neither blood glucose levels nor glucose tolerance were improved in the undifferentiated group. Retrieved graft in the differentiated group showed greater insulin response to high glucose compared with the undifferentiated group.
Conclusion
in vitro differentiation of microencapsulated immature NPCCs increased the proportion of insulin-positive cells and improved transplant efficacy in diabetic mice without immune rejection.

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Dual-targeted nano-encapsulation of neonatal porcine islet-like cell clusters with triiodothyronine-loaded bifunctional polymersomes
Sang Hoon Lee, Minse Kim, Eun-Jin Lee, Sun Mi Ahn, Yu-Rim Ahn, Jaewon Choi, Jung-Taek Kang, Hyun-Ouk Kim
Discover Nano.2024;[Epub] CrossRef
Long‐term efficacy of encapsulated xenogeneic islet transplantation: Impact of encapsulation techniques and donor genetic traits
Heon‐Seok Park, Eun Young Lee, Young‐Hye You, Marie Rhee, Jong‐Min Kim, Seong‐Soo Hwang, Poong‐Yeon Lee
Journal of Diabetes Investigation.2024; 15(6): 693. CrossRef

Others
Generation of Insulin-Expressing Cells in Mouse Small Intestine by Pdx1, MafA, and BETA2/NeuroD: So-Hyun Lee, Marie Rhee, Ji-Won Kim, Kun-Ho Yoon; Diabetes Metab J. 2017;41(5):405-416. Published online September 5, 2017; DOI: https://doi.org/10.4093/dmj.2017.41.5.405

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Background

To develop surrogate insulin-producing cells for diabetes therapy, adult stem cells have been identified in various tissues and studied for their conversion into β-cells. Pancreatic progenitor cells are derived from the endodermal epithelium and formed in a manner similar to gut progenitor cells. Here, we generated insulin-producing cells from the intestinal epithelial cells that induced many of the specific pancreatic transcription factors using adenoviral vectors carrying three genes: PMB (pancreatic and duodenal homeobox 1 [Pdx1], V-maf musculoaponeurotic fibrosarcoma oncogene homolog A [MafA], and BETA2/NeuroD).

Methods

By direct injection into the intestine through the cranial mesenteric artery, adenoviruses (Ad) were successfully delivered to the entire intestine. After virus injection, we could confirm that the small intestine of the mouse was appropriately infected with the Ad-Pdx1 and triple Ad-PMB.

Results

Four weeks after the injection, insulin mRNA was expressed in the small intestine, and the insulin gene expression was induced in Ad-Pdx1 and Ad-PMB compared to control Ad-green fluorescent protein. In addition, the conversion of intestinal cells into insulin-expressing cells was detected in parts of the crypts and villi located in the small intestine.

Conclusion

These data indicated that PMB facilitate the differentiation of mouse intestinal cells into insulin-expressing cells. In conclusion, the small intestine is an accessible and abundant source of surrogate insulin-producing cells.

Citations

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Harnessing gut cells for functional insulin production: Strategies and challenges
Kelvin Baafi, John C. March
Biotechnology Notes.2023; 4: 7. CrossRef
Differential Morphological Diagnosis of Various Forms of Congenital Hyperinsulinism in Children
Lubov Borisovna Mitrofanova, Anastasia Arkadyevna Perminova, Daria Viktorovna Ryzhkova, Anna Andreyevna Sukhotskaya, Vladimir Gireyevich Bairov, Irina Leorovna Nikitina
Frontiers in Endocrinology.2021;[Epub] CrossRef
Generation of iPSC-derived insulin-producing cells from patients with type 1 and type 2 diabetes compared with healthy control
Min Jung Kim, Eun Young Lee, Young-Hye You, Hae Kyung Yang, Kun-Ho Yoon, Ji-Won Kim
Stem Cell Research.2020; 48: 101958. CrossRef
ERK Regulates NeuroD1-mediated Neurite Outgrowth via Proteasomal Degradation
Tae-young Lee, In-Su Cho, Narayan Bashyal, Francisco J Naya, Ming-Jer Tsai, Jeong Seon Yoon, Jung-Mi Choi, Chang-Hwan Park, Sung-Soo Kim, Haeyoung Suh-Kim
Experimental Neurobiology.2020; 29(3): 189. CrossRef
Generation of a PDX1–EGFP reporter human induced pluripotent stem cell line, KSCBi005-A-3, using the CRISPR/Cas9 system
Youngsun Lee, Hye Young Choi, Ara Kwon, Hyeyeon Park, Mi-Hyun Park, Ji-Won Kim, Min Jung Kim, Yong-Ou Kim, Sungwook Kwak, Soo Kyung Koo
Stem Cell Research.2019; 41: 101632. CrossRef

Others
Effect of Atorvastatin on Growth Differentiation Factor-15 in Patients with Type 2 Diabetes Mellitus and Dyslipidemia: Ji Min Kim, Min Kyung Back, Hyon-Seung Yi, Kyong Hye Joung, Hyun Jin Kim, Bon Jeong Ku; Diabetes Metab J. 2016;40(1):70-78. Published online February 19, 2016; DOI: https://doi.org/10.4093/dmj.2016.40.1.70

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Background

Elevated serum levels of growth differentiation factor-15 (GDF-15) are associated with type 2 diabetes. Therefore, the effects of atorvastatin on metabolic parameters and GDF-15 levels in patients with type 2 diabetes and dyslipidemia were evaluated.

Methods

In this prospective randomized trial from February 2013 to March 2014, 50 consecutive type 2 diabetic patients with a low density lipoprotein cholesterol (LDL-C) levels ≥100 mg/dL were enrolled. The patients were divided into two groups based on the amount of atorvastatin prescribed, 10 mg/day (n=23) or 40 mg/day (n=27). The effect of atorvastatin on metabolic parameters, including lipid profiles and GDF-15 levels, at baseline and after 8 weeks of treatment were compared.

Results

The baseline metabolic parameters and GDF-15 levels were not significantly different between the two groups. After 8 weeks of treatment, the total cholesterol (TC) and LDL-C levels were significantly decreased in both groups. The mean changes in TC and LDL-C levels were more significant in the 40 mg atorvastatin group. The GDF-15 level was decreased in the 10 mg atorvastatin group, from 1,460.6±874.8 to 1,451.0±770.8 pg/mL, and was increased in the 40 mg atorvastatin group, from 1,271.6±801.0 to 1,341.4±855.2 pg/mL. However, the change in the GDF-15 level was not statistically significant in the 10 or 40 mg atorvastatin group (P=0.665 and P=0.745, respectively).

Conclusion

The GDF-15 levels were not significantly changed after an 8-week treatment with atorvastatin in type 2 diabetic patients.

Citations

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The relationship of Growth differentiation factor-15 with renal damage and dyslipidemia in non-albuminuric and albuminuric Type-2 Diabetes Mellitus
Hasan Esat Yücel, Bilal İlanbey
Medical Science and Discovery.2022; 9(6): 334. CrossRef
Comparative effectiveness of statins on non-high density lipoprotein cholesterol in people with diabetes and at risk of cardiovascular disease: systematic review and network meta-analysis
Alexander Hodkinson, Dialechti Tsimpida, Evangelos Kontopantelis, Martin K Rutter, Mamas A Mamas, Maria Panagioti
BMJ.2022; : e067731. CrossRef
The Cytokine Growth Differentiation Factor-15 and Skeletal Muscle Health: Portrait of an Emerging Widely Applicable Disease Biomarker
Boel De Paepe
International Journal of Molecular Sciences.2022; 23(21): 13180. CrossRef
Biomarkers of subclinical atherosclerosis in patients with psoriasis
Hannah Kaiser, Xing Wang, Amanda Kvist-Hansen, Martin Krakauer, Peter Michael Gørtz, Benjamin D. McCauley, Lone Skov, Christine Becker, Peter Riis Hansen
Scientific Reports.2021;[Epub] CrossRef
Growth differentiation factor-15 regulates oxLDL-induced lipid homeostasis and autophagy in human macrophages
Kathrin Ackermann, Gabriel A. Bonaterra, Ralf Kinscherf, Anja Schwarz
Atherosclerosis.2019; 281: 128. CrossRef

GDF15 Is a Novel Biomarker for Impaired Fasting Glucose: Jun Hwa Hong, Hyo Kyun Chung, Hye Yoon Park, Kyong-Hye Joung, Ju Hee Lee, Jin Gyu Jung, Koon Soon Kim, Hyun Jin Kim, Bon Jeong Ku, Minho Shong; Diabetes Metab J. 2014;38(6):472-479. Published online December 15, 2014; DOI: https://doi.org/10.4093/dmj.2014.38.6.472

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Background

Growth differentiation factor-15 (GDF15) is a protein that belongs to the transforming growth factor β superfamily. An elevated serum level of GDF15 was found to be associated with type 2 diabetes mellitus (T2DM). T2DM is an inflammatory disease that progresses from normal glucose tolerance (NGT) to impaired fasting glucose (IFG). Hence, we aimed to validate the relationship between GDF15 and IFG.

Methods

The participants were divided into the following three groups: NGT (n=137), IFG (n=29), and T2DM (n=75). The controls and T2DM outpatients visited the hospital for routine health check-ups. We used fasting blood glucose to detect IFG in nondiabetic patients. We checked the body mass index (BMI), C-reactive protein level, metabolic parameters, and fasting serum GDF15 level.

Results

Age, BMI, triglyceride, insulin, glucose, homeostatic model assessment-insulin resistance (HOMA-IR), and GDF15 levels were elevated in the IFG and T2DM groups compared to the NGT group. In the correlation analysis between metabolic parameters and GDF15, age and HOMA-IR had a significant positive correlation with GDF15 levels. GDF15 significantly discriminated between IFG and NGT, independent of age, BMI, and HOMA-IR. The serum levels of GDF15 were more elevated in men than in women. As a biomarker for IFG based on the receiver operating characteristic curve analysis, the cutoff value of GDF15 was 510 pg/mL in males and 400 pg/mL in females.

Conclusion

GDF15 had a positive correlation with IR independent of age and BMI, and the serum level of GDF15 was increased in the IFG and T2DM groups. GDF15 may be a novel biomarker for detecting IFG in nondiabetic patients.

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Michael M Richter, Mads N Thomsen, Mads J Skytte, Sasha A S Kjeldsen, Amirsalar Samkani, Jan Frystyk, Faidon Magkos, Jens J Holst, Sten Madsbad, Thure Krarup, Steen B Haugaard, Nicolai J Wewer Albrechtsen
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Yi-Cheng Lu, Song-Liang Liu, Yu-Shan Zhang, Fei Liang, Xiao-Yan Zhu, Yue Xiao, Jing Wang, Cong Ding, Sudipta Banerjee, Jie-Yun Yin, Qiu-Ping Ma
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Mohamed Asrih, Flore Sinturel, Richard Dubos, Idris Guessous, Zoltan Pataky, Charna Dibner, François R Jornayvaz, Karim Gariani
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Mariya Markova, Liselot Koelman, Silke Hornemann, Olga Pivovarova, Stephanie Sucher, Juergen Machann, Natalia Rudovich, Ralph Thomann, Rosemarie Schneeweiss, Sascha Rohn, Andreas F.H. Pfeiffer, Krasimira Aleksandrova
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Neurodegenerative Diseases.2017; 17(6): 251. CrossRef
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Is GDF15 a Novel Biomarker to Predict the Development of Prediabetes or Diabetes?
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Adenoviruses Expressing PDX-1, BETA2/NeuroD and MafA Induces the Transdifferentiation of Porcine Neonatal Pancreas Cell Clusters and Adult Pig Pancreatic Cells into Beta-Cells: Young-Hye You, Dong-Sik Ham, Heon-Seok Park, Marie Rhee, Ji-Won Kim, Kun-Ho Yoon; Diabetes Metab J. 2011;35(2):119-129. Published online April 30, 2011; DOI: https://doi.org/10.4093/dmj.2011.35.2.119

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Background

A limitation in the number of insulin-producing pancreatic beta-cells is a special feature of diabetes. The identification of alternative sources for the induction of insulin-producing surrogate beta-cells is a matter of profound importance. PDX-1/VP16, BETA2/NeuroD, and MafA overexpression have been shown to influence the differentiation and proliferation of pancreatic stem cells. However, few studies have been conducted using adult animal pancreatic stem cells.

Methods

Adult pig pancreatic cells were prepared from the non-endocrine fraction of adult pig pancreata. Porcine neonatal pancreas cell clusters (NPCCs) were prepared from neonatal pigs aged 1-2 days. The dispersed pancreatic cells were infected with PDX-1/VP16, BETA2/NeuroD, and MafA adenoviruses. After infection, these cells were transplanted under the kidney capsules of normoglycemic nude mice.

Results

The adenovirus-mediated overexpression of PDX-1, BETA2/NeuroD and MafA induced insulin gene expression in NPCCs, but not in adult pig pancreatic cells. Immunocytochemistry revealed that the number of insulin-positive cells in NPCCs and adult pig pancreatic cells was approximately 2.6- and 1.1-fold greater than those in the green fluorescent protein control group, respectively. At four weeks after transplantation, the relative volume of insulin-positive cells in the grafts increased in the NPCCs, but not in the adult porcine pancreatic cells.

Conclusion

These data indicate that PDX-1, BETA2/NeuroD, and MafA facilitate the beta-cell differentiation of NPCCs, but not adult pig pancreatic cells. Therefore PDX-1, BETA2/NeuroD, and MafA-induced NPCCs can be considered good sources for the induction of pancreatic beta-cells, and may also have some utility in the treatment of diabetes.

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Generation of Insulin-Expressing Cells in Mouse Small Intestine by Pdx1, MafA, and BETA2/NeuroD
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Diabetes & Metabolism Journal.2017; 41(5): 405. CrossRef
Quantitative Raman spectral changes of the differentiation of mesenchymal stem cells into islet-like cells by biochemical component analysis and multiple peak fitting
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Generation of Functional Insulin-Producing Cells from Neonatal Porcine Liver-Derived Cells by PDX1/VP16, BETA2/NeuroD and MafA
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PLoS ONE.2013; 8(11): e79076. CrossRef
PPARγ Activation Attenuates Glycated-Serum Induced Pancreatic Beta-Cell Dysfunction through Enhancing Pdx1 and Mafa Protein Stability
Yunxia Zhu, Ai Ma, Hongxiu Zhang, Chaojun Li, Rebecca Berdeaux
PLoS ONE.2013; 8(2): e56386. CrossRef
β‐Cell differentiation and regeneration in type 1 diabetes
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Diabetes, Obesity and Metabolism.2013; 15(s3): 98. CrossRef

Review

Cell Replacement and Regeneration Therapy for Diabetes: Hee-Sook Jun; Korean Diabetes J. 2010;34(2):77-83. Published online April 30, 2010; DOI: https://doi.org/10.4093/kdj.2010.34.2.77

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Reduction of beta cell function and a beta cell mass is observed in both type 1 and type 2 diabetes. Therefore, restoration of this deficiency might be a therapeutic option for treatment of diabetes. Islet transplantation has benefits, such as reduced incidence of hypoglycemia and achievement of insulin independence. However, the major drawback is an insufficient supply of islet donors. Transplantation of cells differentiated in vitro or in vivo regeneration of insulin-producing cells are possible approaches for beta cell/islet regenerative therapy. Embryonic and adult stem cells, pancreatic ductal progenitor cells, acinar cells, and other endocrine cells have been shown to differentiate into pancreatic beta cells. Formation of fully functional beta cells and the safety of these cells are critical issues for successful clinical application.

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Original Articles

Transdifferentiation of Enteroendocrine K-cells into Insulin-expressing Cells.: Esder Lee, Jun Mo Yu, Min Kyung Lee, Gyeong Ryul Ryu, Seung Hyun Ko, Yu Bae Ahn, Sung Dae Moon, Ki Ho Song; Korean Diabetes J. 2009;33(6):475-484. Published online December 1, 2009; DOI: https://doi.org/10.4093/kdj.2009.33.6.475

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BACKGROUND
Despite a recent breakthough in human islet transplantation for treating type 1 diabetes mellitus, the limited availability of donor pancreases remains a major obstacle. Endocrine cells within the gut epithelium (enteroendocrine cells) and pancreatic beta cells share similar pathways of differentiation during embryonic development. In particular, K-cells that secrete glucose-dependent insulinotropic polypeptide (GIP) have been shown to express many of the key proteins found in beta cells. Therefore, we hypothesize that K-cells can be transdifferentiated into beta cells because both cells have remarkable similarities in their embryonic development and cellular phenotypes. METHODS: K-cells were purified from heterogeneous STC-1 cells originating from an endocrine tumor of a mouse intestine. In addition, a K-cell subclone expressing stable Nkx6.1, called "Kn4-cells," was successfully obtained. In vitro differentiation of K-cells or Kn4-cells into beta cells was completed after exendin-4 treatment and serum deprivation. The expressions of insulin mRNA and protein were examined by RT-PCR and immunocytochemistry. The interacellular insulin content was also measured. RESULTS: K-cells were found to express glucokinase and GIP as assessed by RT-PCR and Western blot analysis. RT-PCR showed that K-cells also expressed Pdx-1, NeuroD1/Beta2, and MafA, but not Nkx6.1. After exendin-4 treatment and serum deprivation, insulin mRNA and insulin or C-peptide were clearly detected in Kn4-cells. The intracellular insulin content was also increased significantly in these cells. CONCLUSION: K-cells are an attractive potential source of insulin-producing cells for treatment of type 1 diabetes mellitus. However, more experiments are necessary to optimize a strategy for converting K-cells into beta cells.

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Reprogramming of enteroendocrine K cells to pancreatic β-cells through the combined expression of Nkx6.1 and Neurogenin3, and reaggregation in suspension culture
Esder Lee, Gyeong Ryul Ryu, Sung-Dae Moon, Seung-Hyun Ko, Yu-Bae Ahn, Ki-Ho Song
Biochemical and Biophysical Research Communications.2014; 443(3): 1021. CrossRef

Effect of Adipose Differentiation-Related Protein (ADRP) on Glucose Uptake of Skeletal Muscle.: Yun Hyi Ku, Min Kim, Sena Kim, Ho Seon Park, Han Jong Kim, In Kyu Lee, Dong Hoon Shin, Sung Soo Chung, Sang Gyu Park, Young Min Cho, Hong Kyu Lee, Kyong Soo Park; Korean Diabetes J. 2009;33(3):206-214. Published online June 1, 2009; DOI: https://doi.org/10.4093/kdj.2009.33.3.206

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Abstract PDF: BACKGROUND
Skeletal muscle is the most important tissue contributing to insulin resistance. Several studies have shown that accumulation of intramyocellular lipid is associated with the development of insulin resistance. Thus, proteins involved in lipid transport, storage and metabolism might also be involved in insulin action in skeletal muscle. Adipose differentiation-related protein (ADRP), which is localized at the surface of lipid droplets, is known to be regulated by peroxisome proliferator activated receptor gamma (PPARgamma). However, it is not known whether ADRP plays a role in regulating glucose uptake and insulin action in skeletal muscle. METHODS: ADRP expression in skeletal muscle was measured by RT-PCR and western blot in db/db mice with and without PPARgamma agonist. The effect of PPARgamma agonist or high lipid concentration (0.4% intralipos) on ADRP expression was also obtained in cultured human skeletal muscle cells. Glucose uptake was measured when ADRP was down-regulated with siRNA or when ADRP was overexpressed with adenovirus. RESULTS: ADRP expression increased in the skeletal muscle of db/db mice in comparison with normal controls and tended to increase with the treatment of PPARgamma agonist. In cultured human skeletal muscle cells, the treatment of PPARgamma agonist or high lipid concentration increased ADRP expression. siADRP treatment decreased both basal and insulin-stimulated glucose uptake whereas ADRP overexpression increased glucose uptake in cultured human skeletal muscle cells. CONCLUSION: ADRP expression in skeletal muscle is increased by PPARgamma agonist or exposure to high lipid concentration. In these conditions, increased ADRP contributed to increase glucose uptake. These results suggest that insulin-sensitizing effects of PPARgamma are at least partially achieved by the increase of ADRP expression, and ADRP has a protective effect against intramyocellular lipid-induced insulin resistance.

Differentiation of Pancreatic beta Cells from Human Pancreatic Duct Cells Derived from a Partial Pancreas Tissue.: Ki Ho Song, Myung Mee Kim, Min Kyung Lee, Gyeong Ryul Ryu, Seung Hyun Ko, Sung Dae Moon, Yu Bae Ahn, Kun Ho Yoon, Bong Yun Cha, Kwang Woo Lee, Ho Young Son, Sung Koo Kang, Hyung Min Chin; Korean Diabetes J. 2007;31(3):236-242. Published online May 1, 2007; DOI: https://doi.org/10.4093/jkda.2007.31.3.236

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Abstract PDF

BACKGROUND
Despite a recent breakthrough in human islet transplantation for treating diabetes mellitus, the limited availability of insulin-producing tissue is still a major obstacle. This has led to a search for alternative sources of transplantable insulin-producing cells including pancreatic duct cells. We aimed to establish in vitro culture of pancreatic duct cells from a partial pancreas tissue in human, which could be harnessed to differentiate into pancreatic beta cells. METHODS: We isolated pancreatic duct cells from small pieces of pancreas tissue (1~3 g) derived from non-diabetic humans (n = 8) undergoing pancreatic surgery due to cancer. Pancreas tissue was finely minced after injection of collagenase P into the parenchyma. The mince was incubated in a shaking water bath at 37degrees C for 25 min and passed through a 150 micrometer mesh. The released cells were recovered, washed, and plated in a dish containing CMRL culture medium with serum. RESULTS: Isolated pancreatic cells grew in monolayer and became confluent in 1~2 wks showing typical epithelial cobblestone morphology. Immunochemistry demonstrated that ~90% of the cultured cells were cytokeratin7-positive duct cells. To induce beta cell differentiation, the cells were incubated in DMEM/F12 culture medium without serum. In addition, treatment with Matrigel overlay, exendin-4, cholera toxin or forskolin was done. Though beta cell differentiation was found by immunostaining and RT-PCR, the differentiation efficiency was very low. Over-expression of neurogenin-3 by recombinant adenovirus did not increase beta cell differentiation of the cultured duct cells significantly. CONCLUSION: We established in vitro culture of pancreatic duct cells from a partial pancreas tissue in human, which differentiate into pancreatic cells. However, a strategy to optimize beta cell differentiation in this model is needed.

Citations

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Transdifferentiation of Enteroendocrine K-cells into Insulin-expressing Cells
Esder Lee, Jun Mo Yu, Min Kyung Lee, Gyeong Ryul Ryu, Seung-Hyun Ko, Yu-Bae Ahn, Sung-Dae Moon, Ki-Ho Song
Korean Diabetes Journal.2009; 33(6): 475. CrossRef

PDX-1/VP16 Overexpression Induce the Transdifferentiation of Canine Adult Pancreatic Cells into Beta-cells.: Young Hye You, Sun Cheol Park, Seung Hwan Lee, Heon Seok Park, Dong Sik Ham, Marie Rhee, Ji Won Kim, Ki Ho Song, Kun Ho Yoon; Korean Diabetes J. 2007;31(1):51-62. Published online January 1, 2007; DOI: https://doi.org/10.4093/jkda.2007.31.1.51

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Abstract PDF

BACKGROUND
A major obstacle of islet transplantation is an inadequate supply of insulin-producing tissue. Ad-PDX-1/VP16 overexpression and Exendin-4 treatment have been proved the effects on differentiation and proliferation of pancreatic stem cells. But, the study is insufficient using adult animal pancreatic stem cells. METHODS: Pancreatic cells were prepared from the non-endocrine fraction of canine pancreases. This cells were cultivated free floating state and monolayer culture after dispersion. The floating pancreatic cells were transplanted under the kidney capsule of normoglycaemic nude mice. The dispersed pancreatic cells were infected with Ad-PDX-1/VP16 or Ad-GFP. After infection, those cells were transplanted of nude mice. After transplantation, mice were treated with either 1 nmol/kg exendin-4 or saline solution by intraperitoneal injection for 10 days. RESULTS: The relative volume of the beta-cells in the grafts of the free floating cultured pancreatic cells were 23.4 +/- 13.1% at two weeks and 5.2 +/- 2.0% at eight weeks. At two weeks after transplantation, the relative volume of insulin-positive cells in the grafts of dispersed pancreatic cells were 28 +/- 5.7%, 20.5 +/- 0.7% and 31 +/- 1.4% in control, GFP and PDX-1/VP16 treated groups respectively. At eight weeks after transplantation, the relative volume of insulin-positive cells in the grafts were 11.8 +/- 5.9%, 8 +/- 7.3% and 16.6 +/- 7.4% in control, GFP and PDX-1/VP16 treated groups respectively. Exendin-4 treatment didn't show any additive effects on transdifferentiation of pancreas stem cell into beta-cells. CONCLUSION: The expansion and transdifferentiation were not observed after the transplantation of the free floating cultured pancreatic cells. PDX-1/VP16 overexpression induces the transdifferentiation of adult pancreatic cells into beta-cells. However Exendin-4 treatment hasn't any effects on the expansion and transdifferentiation of the cells in the grafts.

Citations

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Generation of Functional Insulin-Producing Cells from Neonatal Porcine Liver-Derived Cells by PDX1/VP16, BETA2/NeuroD and MafA
Dong-Sik Ham, Juyoung Shin, Ji-Won Kim, Heon-Seok Park, Jae-Hyoung Cho, Kun-Ho Yoon, Kathrin Maedler
PLoS ONE.2013; 8(11): e79076. CrossRef
Adenoviruses Expressing PDX-1, BETA2/NeuroD and MafA Induces the Transdifferentiation of Porcine Neonatal Pancreas Cell Clusters and Adult Pig Pancreatic Cells into Beta-Cells
Young-Hye You, Dong-Sik Ham, Heon-Seok Park, Marie Rhee, Ji-Won Kim, Kun-Ho Yoon
Diabetes & Metabolism Journal.2011; 35(2): 119. CrossRef
Transdifferentiation of Enteroendocrine K-cells into Insulin-expressing Cells
Esder Lee, Jun Mo Yu, Min Kyung Lee, Gyeong Ryul Ryu, Seung-Hyun Ko, Yu-Bae Ahn, Sung-Dae Moon, Ki-Ho Song
Korean Diabetes Journal.2009; 33(6): 475. CrossRef

Review

The Roles of Clusterin on Morphogenesis of Beta Cells During Pancreas Regeneration.: Seok Woo Hong, KC Ranjan, Song Lee, Yong Jae Shin, Bon Hong Min, In Sun Park; Korean Diabetes J. 2007;31(1):1-8. Published online January 1, 2007; DOI: https://doi.org/10.4093/jkda.2007.31.1.1

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Abstract PDF

Clusterin is a highly glycosylated heterodimeric glycoprotein that plays diverse biological roles in various organs. The secreted clusterin has been established as a major form of the protein that exerts diverse tissue effects. For instance, clusterin is known to act in cell protection through the actions of extra-cellular molecular chaperones. In the extracellular milieu, clusterin participates in specific interactions with a diverse array of native biological molecules including LRP-2 (Lipoprotein receptor-related protein 2, also known as gp330 or megalin), which is involved in ligand endocytosis at the surfaces of certain epithelia. Clusterin is expressed transiently in developing and differentiating endocrine pancreatic cells and might be involved in pancreas development. This transient expression of clusterin at specific time points of pancreas development and cell differentiation during pancreas regeneration implies that the protein is a regulatory factor for cytodifferentiation as well as for replication. A specific action of the clusterin in the reconstruction and remodeling of the endocrine pancreas has been demonstrated. It also strongly stimulates duct cell differentiation into insulin-secreting cells under in vitro culture conditions. Clusterin appears thus as a potent regulator of insulin cell morphogenesis.

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Effect of African Mango (Irvingia gabonesis, IGOB 131^TM) Extract on Glucose Regulation in STZ-Induced Diabetes
Yejin Ha, Minhee Lee, Han Ol Kwon, Yoo-Hyun Lee
Journal of the Korean Society of Food Science and Nutrition.2015; 44(11): 1607. CrossRef

Original Articles

Characterization of Preadipocyte factor-1 (Pref-1) Expressing Pancreatic Cells.: Marie Rhee, Sun Hee Suh, Youn Joo Yang, Ji Won Kim, Sung Yoon Jeon, Oak Kee Hong, Seung Hyun Ko, Yoon Hee Choi, Bong Yun Cha, Ho Yong Son, Kun Ho Yoon; Korean Diabetes J. 2005;29(6):507-516. Published online November 1, 2005

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Abstract PDF: BACKGROUND
Preadipocyte factor-1/Delta-like 1(Pref-1/Dlk1) is a type I membrane protein that has six epidermal growth factor (EGF)-like repeats in its extracellular and a short cytoplasmic domain. It is widely expressed in embryonic tissues, whereas its expressions were limited in adult and postnatal stage. To characterize the Pref-1 expressing cells during pancreas development and regeneration after birth, we analyzed Pref-1 expression in embryonic and adult partial pancreatectomized rat pancreas, and primary cultured neonatal pig pancreatic cells. METHODS: Whole fetuses or pieces of rat pancreas were obtained at E20. 90% partial pancreatectomy (Px) and sham operation were done using 5 week-old Sprague-Dawley rats. Experimental animals were divided into 11 groups by time of killing after surgery; 0, 1, 3, 6 and 12 hours, 1, 2, 3, 5, 7, and 14 days. All tissues were immunostained with Pref-1 and analysed by reverse transcriptase (RT)-PCR. Porcine neonatal pancreas cell clusters (NPCCs) were prepared from neonatal pigs aged 1-2 days. Cells were harvested on day 0, 3, 4, 5, 6, and 7 after dispersion. All cells were immunostained with Pref-1 and other specific cell markers such as Pan-cytokeratin (Pan-CK), vimentin (VT) and islet hormones, and confirmed by Western blot, RT-PCR and fluorescence activated cell sorting (FACS) analysis. RESULTS: In the rat embryonic pancreas at E20, Pref-1 expression was restricted only in the small branching ductules. In adult rat pancreas, Pref-1 was not expressed at all. Whereas, Pref-1 transiently expressed in the small regenerating duct cells located in foci of regeneration in Px model, then completely disappeared at day 7. The Pref-1 mRNA measured by RT-PCR was peaked at day 3 after Px and then gradually disappeared. Pref-1 expression pattern was also reproduced in monolayer cultured NPCCs. In NPCCs, protein levels of Pref-1 were peaked at day 0 to day 4 then gradually disappeared until day 7 by western blot. Most of Pref-1 expressing cells were co-stained with cytokeratin. The proportion of Pref-1 expressing cells in dispersed NPCCs were counted and isolated by FACS at 3 days after culture were 25% and then decreased over time during 7 days culture period. CONCLUSIONS: Pref-1 expression was regained in adult pancreatic cells during regeneration in vivo and in vitro and Pref-1 might be a useful marker for the pancreatic protodifferentiated cells.

The Effects of Dexamethasone on the Expansion and Transdifferentiation of Transplanted Porcine Neonatal Pancreas Cell Clusters into beta-cells in Normal Nude Mice.: Ji Hun Yang, Sun Hee Suh, Sung Yoon Jeon, Oak Kee Hong, Kun Ho Yoon; Korean Diabetes J. 2004;28(5):356-366. Published online October 1, 2004

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Abstract PDF: BACKGROUND
Several studies have suggested that glucocorticoid has an influence on the development and function of the -cells. Thus, we undertook this study to determine whether exposure to dexamethasone (Dx) has an influence on the expansion or transdifferentiation of transplanted porcine NPCCs. METHODS: After transplantation (Tx) of 4,000 islet equivalents (IEQs) of porcine NPCCs into normal nude mice, Dx (1mg/kg) or the control vehicle were injected daily for 10 weeks. To clarify the effects of timing and duration of the Dx, one group was treated by Dx at the first 2 weeks (n=10) and the other group was treated later 8 weeks (n=10) during the 10 weeks treatment period. Thr total graft and beta-cell masses were determined by morphometric analysis. We preformed semi-quantitative RT-PCR for evaluating the pancreas transcription factors. RESULTS: The relative volume and absolute mass of the beta-cells and the total graft were significantly decreased by 10 weeks Dx treatment. Moreover, Dx treatment at thr first 2 weeks (n=10) also significantly decreased the total graft mass and absolute mass of the beta-cells. The relative volume of the beta-cells was negatively correlated and the area of the duct cysts was positively correlated with the duration of the Dx treatment. Pancreas transcription factors including PDX1, Ngn 3, ISL1 and NKx6.1 were decreased in the graft by 2 days treatment of Dx. CONCLUSION: These results suggest that Dx treatment suppresses the expansion and transdifferentiation of transplanted pancreas precursor cells into beta-cell.

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