Diabetes & Metabolism Journal

Review

Metabolic Risk/Epidemiology
Glucagon-Like Peptide-1: New Regulator in Lipid Metabolism: Tong Bu, Ziyan Sun, Yi Pan, Xia Deng, Guoyue Yuan; Received August 14, 2023 Accepted January 1, 2024 Published online April 1, 2024; DOI: https://doi.org/10.4093/dmj.2023.0277 [Epub ahead of print]

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Abstract PDF PubReader ePub: Glucagon-like peptide-1 (GLP-1) is a 30-amino acid peptide hormone that is mainly expressed in the intestine and hypothalamus. In recent years, basic and clinical studies have shown that GLP-1 is closely related to lipid metabolism, and it can participate in lipid metabolism by inhibiting fat synthesis, promoting fat differentiation, enhancing cholesterol metabolism, and promoting adipose browning. GLP-1 plays a key role in the occurrence and development of metabolic diseases such as obesity, nonalcoholic fatty liver disease, and atherosclerosis by regulating lipid metabolism. It is expected to become a new target for the treatment of metabolic disorders. The effects of GLP-1 and dual agonists on lipid metabolism also provide a more complete treatment plan for metabolic diseases. This article reviews the recent research progress of GLP-1 in lipid metabolism.

Original Article

Metabolic Risk/Epidemiology
Biologically Informed Polygenic Scores for Brain Insulin Receptor Network Are Associated with Cardiometabolic Risk Markers and Diabetes in Women: Jannica S. Selenius, Patricia P. Silveira, Mikaela von Bonsdorff, Jari Lahti, Hannu Koistinen, Riitta Koistinen, Markku Seppälä, Johan G. Eriksson, Niko S. Wasenius; Received February 10, 2023 Accepted November 25, 2023 Published online March 25, 2024; DOI: https://doi.org/10.4093/dmj.2023.0039 [Epub ahead of print]

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Abstract PDF Supplementary Material PubReader ePub: Background
To investigate associations between variations in the co-expression-based brain insulin receptor polygenic score and cardiometabolic risk factors and diabetes mellitus.
Methods
This cross-sectional study included 1,573 participants from the Helsinki Birth Cohort Study. Biologically informed expression-based polygenic risk scores for the insulin receptor gene network were calculated for the hippocampal (hePRS-IR) and the mesocorticolimbic (mePRS-IR) regions. Cardiometabolic markers included body composition, waist circumference, circulating lipids, insulin-like growth factor 1 (IGF-1), and insulin-like growth factor-binding protein 1 and 3 (IGFBP-1 and -3). Glucose and insulin levels were measured during a standardized 2-hour 75 g oral glucose tolerance test and impaired glucose regulation status was defined by the World Health Organization 2019 criteria. Analyzes were adjusted for population stratification, age, smoking, alcohol consumption, socioeconomic status, chronic diseases, birth weight, and leisure-time physical activity.
Results
Multinomial logistic regression indicated that one standard deviation increase in hePRS-IR was associated with increased risk of diabetes mellitus in all participants (adjusted relative risk ratio, 1.17; 95% confidence interval, 1.01 to 1.35). In women, higher hePRS-IR was associated with greater waist circumference and higher body fat percentage, levels of glucose, insulin, total cholesterol, low-density lipoprotein cholesterol, triglycerides, apolipoprotein B, insulin, and IGFBP-1 (all P≤0.02). The mePRS-IR was associated with decreased IGF-1 level in women (P=0.02). No associations were detected in men and studied outcomes.
Conclusion
hePRS-IR is associated with sex-specific differences in cardiometabolic risk factor profiles including impaired glucose regulation, abnormal metabolic markers, and unfavorable body composition in women.

Reviews

Basic Research
Roles of Histone Deacetylase 4 in the Inflammatory and Metabolic Processes: Hyunju Kang, Young-Ki Park, Ji-Young Lee, Minkyung Bae; Received June 5, 2023 Accepted February 7, 2024 Published online March 22, 2024; DOI: https://doi.org/10.4093/dmj.2023.0174 [Epub ahead of print]

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Abstract PDF PubReader ePub: Histone deacetylase 4 (HDAC4), a class IIa HDAC, has gained attention as a potential therapeutic target in treating inflammatory and metabolic processes based on its essential role in various biological pathways by deacetylating non-histone proteins, including transcription factors. The activity of HDAC4 is regulated at the transcriptional, post-transcriptional, and post-translational levels. The functions of HDAC4 are tissue-dependent in response to endogenous and exogenous factors and their substrates. In particular, the association of HDAC4 with non-histone targets, including transcription factors, such as myocyte enhancer factor 2, hypoxia-inducible factor, signal transducer and activator of transcription 1, and forkhead box proteins, play a crucial role in regulating inflammatory and metabolic processes. This review summarizes the regulatory modes of HDAC4 activity and its functions in inflammation, insulin signaling and glucose metabolism, and cardiac muscle development.

Pathophysiology
Primordial Drivers of Diabetes Heart Disease: Comprehensive Insights into Insulin Resistance: Yajie Fan, Zhipeng Yan, Tingting Li, Aolin Li, Xinbiao Fan, Zhongwen Qi, Junping Zhang; Diabetes Metab J. 2024;48(1):19-36. Published online January 3, 2024; DOI: https://doi.org/10.4093/dmj.2023.0110

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Abstract PDF PubReader ePub: Insulin resistance has been regarded as a hallmark of diabetes heart disease (DHD). Numerous studies have shown that insulin resistance can affect blood circulation and myocardium, which indirectly cause cardiac hypertrophy and ventricular remodeling, participating in the pathogenesis of DHD. Meanwhile, hyperinsulinemia, hyperglycemia, and hyperlipidemia associated with insulin resistance can directly impair the metabolism and function of the heart. Targeting insulin resistance is a potential therapeutic strategy for the prevention of DHD. Currently, the role of insulin resistance in the pathogenic development of DHD is still under active research, as the pathological roles involved are complex and not yet fully understood, and the related therapeutic approaches are not well developed. In this review, we describe insulin resistance and add recent advances in the major pathological and physiological changes and underlying mechanisms by which insulin resistance leads to myocardial remodeling and dysfunction in the diabetic heart, including exosomal dysfunction, ferroptosis, and epigenetic factors. In addition, we discuss potential therapeutic approaches to improve insulin resistance and accelerate the development of cardiovascular protection drugs.

Original Article

Basic Research
Altered Metabolic Phenotypes and Hypothalamic Neuronal Activity Triggered by Sodium-Glucose Cotransporter 2 Inhibition: Ho Gyun Lee, Il Hyeon Jung, Byong Seo Park, Hye Rim Yang, Kwang Kon Kim, Thai Hien Tu, Jung-Yong Yeh, Sewon Lee, Sunggu Yang, Byung Ju Lee, Jae Geun Kim, Il Seong Nam-Goong; Diabetes Metab J. 2023;47(6):784-795. Published online August 23, 2023; DOI: https://doi.org/10.4093/dmj.2022.0261

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Background
Sodium-glucose cotransporter 2 (SGLT-2) inhibitors are currently used to treat patients with diabetes. Previous studies have demonstrated that treatment with SGLT-2 inhibitors is accompanied by altered metabolic phenotypes. However, it has not been investigated whether the hypothalamic circuit participates in the development of the compensatory metabolic phenotypes triggered by the treatment with SGLT-2 inhibitors.
Methods
Mice were fed a standard diet or high-fat diet and treated with dapagliflozin, an SGLT-2 inhibitor. Food intake and energy expenditure were observed using indirect calorimetry system. The activity of hypothalamic neurons in response to dapagliflozin treatment was evaluated by immunohistochemistry with c-Fos antibody. Quantitative real-time polymerase chain reaction was performed to determine gene expression patterns in the hypothalamus of dapagliflozin-treated mice.
Results
Dapagliflozin-treated mice displayed enhanced food intake and reduced energy expenditure. Altered neuronal activities were observed in multiple hypothalamic nuclei in association with appetite regulation. Additionally, we found elevated immunosignals of agouti-related peptide neurons in the paraventricular nucleus of the hypothalamus.
Conclusion
This study suggests the functional involvement of the hypothalamus in the development of the compensatory metabolic phenotypes induced by SGLT-2 inhibitor treatment.

Citations

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Altered Metabolic Phenotypes and Hypothalamic Neuronal Activity Triggered by Sodium-Glucose Cotransporter 2 Inhibition (Diabetes Metab J 2023;47:784-95)
Jae Hyun Bae
Diabetes & Metabolism Journal.2024; 48(1): 157. CrossRef
Altered Metabolic Phenotypes and Hypothalamic Neuronal Activity Triggered by Sodium-Glucose Cotransporter 2 Inhibition (Diabetes Metab J 2023;47:784-95)
Ho Gyun Lee, Il Hyeon Jung, Byong Seo Park, Hye Rim Yang, Kwang Kon Kim, Thai Hien Tu, Jung-Yong Yeh, Sewon Lee, Sunggu Yang, Byung Ju Lee, Jae Geun Kim, Il Seong Nam-Goong
Diabetes & Metabolism Journal.2024; 48(1): 159. CrossRef

Review

Basic Research
Adipose Tissue and Metabolic Health: Sung-Min An, Seung-Hee Cho, John C. Yoon; Diabetes Metab J. 2023;47(5):595-611. Published online July 24, 2023; DOI: https://doi.org/10.4093/dmj.2023.0011

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In this review, we provide a brief synopsis of the connections between adipose tissue and metabolic health and highlight some recent developments in understanding and exploiting adipocyte biology. Adipose tissue plays critical roles in the regulation of systemic glucose and lipid metabolism and secretes bioactive molecules possessing endocrine, paracrine, and autocrine functions. Dysfunctional adipose tissue has a detrimental impact on metabolic health and is intimately involved in key aspects of metabolic diseases such as insulin resistance, lipid overload, inflammation, and organelle stress. Differences in the distribution of fat depots and adipose characteristics relate to divergent degrees of metabolic dysfunction found in metabolically healthy and unhealthy obese individuals. Thermogenic adipocytes increase energy expenditure via mitochondrial uncoupling or adenosine triphosphate-consuming futile substrate cycles, while functioning as a metabolic sink and participating in crosstalk with other metabolic organs. Manipulation of adipose tissue provides a wealth of opportunities to intervene and combat the progression of associated metabolic diseases. We discuss current treatment modalities for obesity including incretin hormone analogs and touch upon emerging strategies with therapeutic potential including exosome-based therapy, pharmacological activation of brown and beige adipocyte thermogenesis, and administration or inhibition of adipocyte-derived factors.

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Original Article

Others
Change Profiles and Functional Targets of MicroRNAs in Type 2 Diabetes Mellitus Patients with Obesity: Guanhua Lu, Huanhuan Gao, Zhiyong Dong, Shuwen Jiang, Ruixiang Hu, Cunchuan Wang; Diabetes Metab J. 2023;47(4):559-570. Published online April 25, 2023; DOI: https://doi.org/10.4093/dmj.2022.0226

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Abstract PDF Supplementary Material PubReader ePub: Background
MicroRNAs (miRNAs) exert an essential contribution to obesity and type 2 diabetes mellitus (T2DM). This study aimed to investigate the differences of miRNAs in the presence and absence of T2DM in patients with obesity, as well as before and after bariatric surgery in T2DM patients with obesity. Characterization of the common changes in both was further analyzed.
Methods
We enrolled 15 patients with obesity but without T2DM and 15 patients with both obesity and T2DM. Their preoperative clinical data and serum samples were collected, as well as 1 month after bariatric surgery. The serum samples were analyzed by miRNA sequencing, and the miRNAs profiles and target genes characteristics were compared.
Results
Patients with T2DM had 16 up-regulated and 32 down-regulated miRNAs compared to patients without T2DM. Improvement in metabolic metrics after bariatric surgery of T2DM patients with obesity was correlated with changes in miRNAs, as evidenced by the upregulation of 20 miRNAs and the downregulation of 30 miRNAs. Analysis of the two miRNAs profiles identified seven intersecting miRNAs that showed opposite changes. The target genes of these seven miRNAs were substantially enriched in terms or pathways associated with T2DM.
Conclusion
We determined the expression profiles of miRNAs in the obese population, with and without diabetes, before and after bariatric surgery. The miRNAs that intersected in the two comparisons were discovered. Both the miRNAs discovered and their target genes were closely associated with T2DM, demonstrating that they might be potential targets for the regulation of T2DM.

Review

Others
Current Trends of Big Data Research Using the Korean National Health Information Database: Mee Kyoung Kim, Kyungdo Han, Seung-Hwan Lee; Diabetes Metab J. 2022;46(4):552-563. Published online July 27, 2022; DOI: https://doi.org/10.4093/dmj.2022.0193

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Abstract PDF PubReader ePub

Recently, medical research using big data has become very popular, and its value has become increasingly recognized. The Korean National Health Information Database (NHID) is representative of big data that combines information obtained from the National Health Insurance Service collected for claims and reimbursement of health care services and results obtained from general health examinations provided to all Korean adults. This database has several strengths and limitations. Given the large size, various laboratory data, and questionnaires obtained from medical check-ups, their longitudinal nature, and long-term accumulation of data since 2002, carefully designed studies may provide valuable information that is difficult to obtain from other forms of research. However, consideration of possible bias and careful interpretation when defining causal relationships is also important because the data were not collected for research purposes. After the NHID became publicly available, research and publications based on this database have increased explosively, especially in the field of diabetes and metabolism. This article reviews the history, structure, and characteristics of the Korean NHID. Recent trends in big data research using this database, commonly used operational diagnosis, and representative studies have been introduced. We expect further progress and expansion of big data research using the Korean NHID.

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Original Article

Metabolic Risk/Epidemiology
Iron Overload and the Risk of Diabetes in the General Population: Results of the Chinese Health and Nutrition Survey Cohort Study: He Gao, Jinying Yang, Wenfei Pan, Min Yang; Diabetes Metab J. 2022;46(2):307-318. Published online March 7, 2022; DOI: https://doi.org/10.4093/dmj.2020.0287

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Background
Recent studies have found that there are significant associations between body iron status and the development of diabetes. In the present study, we aimed to analyze the association among iron overload (IO), insulin resistance (IR), and diabetes in Chinese adults, and to explore the sex difference.
Methods
Men and women (age >19 years) who participated in the Chinese Health and Nutrition Survey and did not have diabetes at baseline were followed between 2009 and 2015 (n=5,779). Over a mean of 6 years, 75 participants were diagnosed with incident diabetes. Logistic regression was used to assess the risk factors associated with IO. Cox proportional hazard regression was used to estimate the risk of incident diabetes and to determine whether the risk differed among subgroups. Causal mediation analysis (CMA) was used to explore the mechanism linking IO and diabetes.
Results
According to sex-stratified multivariable-adjusted Cox proportional hazards regression, IO increased the risk of incident diabetes. Women with IO had a higher risk of diabetes than men. Subgroup analysis with respect to age showed that the association between IO and diabetes was stronger in older women and younger men (P<0.001). CMA showed that liver injury (alanine transaminase) and lipid metabolism abnormalities (triglyceride, apolipoprotein B) contributed to the association between IO and diabetes.
Conclusion
IO is associated with diabetes and this association is sex-specific. IO may indirectly induce IR via liver injury and lipid metabolism abnormalities, resulting in diabetes.

Citations

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Quantitative susceptibility mapping for iron monitoring of multiple subcortical nuclei in type 2 diabetes mellitus: a systematic review and meta-analysis
Sana Mohammadi, Sadegh Ghaderi, Fatemeh Sayehmiri, Mobina Fathi
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Plasma Ferritin Concentrations in the General Population: A Cross-Sectional Analysis of Anthropometric, Metabolic, and Dietary Correlates
Cara Övermöhle, Sabina Waniek, Gerald Rimbach, Katharina Susanne Weber, Wolfgang Lieb
The Journal of Nutrition.2023; 153(5): 1524. CrossRef
Association of Body Iron Metabolism with Type 2 Diabetes Mellitus in Chinese Women of Childbearing Age: Results from the China Adult Chronic Disease and Nutrition Surveillance (2015)
Jie Feng, Xiaoyun Shan, Lijuan Wang, Jiaxi Lu, Yang Cao, Lichen Yang
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Iron overload induces islet β cell ferroptosis by activating ASK1/P-P38/CHOP signaling pathway
Ling Deng, Man-Qiu Mo, Jinling Zhong, Zhengming Li, Guoqiao Li, Yuzhen Liang
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Epidemiological and transcriptome data identify potential key genes involved in iron overload for type 2 diabetes
Xuekui Liu, Xiu Hong, Shiqiang Jiang, Rui Li, Qian Lv, Jie Wang, Xiuli Wang, Manqing Yang, Houfa Geng, Yang Li
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Andong He, Zhuoping Zhou, Lili Huang, Ka Cheuk Yip, Jing Chen, Ruiling Yan, Ruiman Li
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Iron deficiency in cardiac surgical patients
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Reviews

Basic Research
Brown Fat as a Regulator of Systemic Metabolism beyond Thermogenesis: Okamatsu-Ogura Yuko, Masayuki Saito; Diabetes Metab J. 2021;45(6):840-852. Published online June 25, 2021; DOI: https://doi.org/10.4093/dmj.2020.0291

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Graphical Abstract Abstract PDF PubReader ePub

Brown adipose tissue (BAT) is a specialized tissue for nonshivering thermogenesis to dissipate energy as heat. Although BAT research has long been limited mostly in small rodents, the rediscovery of metabolically active BAT in adult humans has dramatically promoted the translational studies on BAT in health and diseases. Moreover, several remarkable advancements have been made in brown fat biology over the past decade: The molecular and functional analyses of inducible thermogenic adipocytes (socalled beige adipocytes) arising from a developmentally different lineage from classical brown adipocytes have been accelerated. In addition to a well-established thermogenic activity of uncoupling protein 1 (UCP1), several alternative thermogenic mechanisms have been discovered, particularly in beige adipocytes. It has become clear that BAT influences other peripheral tissues and controls their functions and systemic homeostasis of energy and metabolic substrates, suggesting BAT as a metabolic regulator, other than for thermogenesis. This notion is supported by discovering that various paracrine and endocrine factors are secreted from BAT. We review the current understanding of BAT pathophysiology, particularly focusing on its role as a metabolic regulator in small rodents and also in humans.

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Brown adipose tissue evaluation using water and triglyceride as indices by diffuse reflectance spectroscopy
Tomomi Iida, Yukio Ueda, Hideo Tsukada, Dai Fukumoto, Takafumi Hamaoka
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Basic Research
Revisiting the Bacterial Phylum Composition in Metabolic Diseases Focused on Host Energy Metabolism: Yeonmi Lee, Hui-Young Lee; Diabetes Metab J. 2020;44(5):658-667. Published online July 9, 2020; DOI: https://doi.org/10.4093/dmj.2019.0220

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Over a hundred billion bacteria are found in human intestines. This has emerged as an environmental factor in metabolic diseases, such as obesity and related diseases. The majority of these bacteria belong to two dominant phyla, Bacteroidetes and Firmicutes. Since the ratio of Firmicutes to Bacteroidetes increases in people with obesity and in various animal models, it has been assumed that phylum composition causes the increase in occurrence of metabolic diseases over the past decade. However, this assumption has been challenged by recent studies that have found even an opposite association of phylum composition within metabolic diseases. Moreover, the gut microbiota affects host energy metabolism in various ways including production of metabolites and interaction with host intestinal cells to regulate signaling pathways that affect energy metabolism. However, the direct effect of gut bacteria on host energy intake, such as energy consumption by the bacteria itself and its effects on intestinal energy absorption, has been underestimated. This review aims to discuss whether increased ratio of Firmicutes to Bacteroidetes is associated with the development of metabolic diseases, and whether energy competition between the bacteria and host is a missing part of the mechanism linking gut microbiota to metabolic diseases.

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Sulwon Lecture 2019

Pathophysiology
The Role of Growth Differentiation Factor 15 in Energy Metabolism: Joon Young Chang, Hyun Jung Hong, Seul Gi Kang, Jung Tae Kim, Ben Yuan Zhang, Minho Shong; Diabetes Metab J. 2020;44(3):363-371. Published online June 29, 2020; DOI: https://doi.org/10.4093/dmj.2020.0087

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Growth differentiation factor 15 (GDF15) is receiving great interest beyond its role as an aging and disease-related biomarker. Recent discovery of its receptor, glial cell line-derived neurotrophic factor (GDNF) family receptor α-like (GFRAL), suggests a central role in appetite regulation. However, there is also considerable evidence that GDF15 may have peripheral activity through an as-of-yet undiscovered mode of action. This raises the question as to whether increased GDF15 induction during pathophysiologic conditions also suppresses appetite. The present review will briefly introduce the discovery of GDF15 and describe the different contexts under which GDF15 is induced, focusing on its induction during mitochondrial dysfunction. We will further discuss the metabolic role of GDF15 under various pathophysiological conditions and conclude with possible therapeutic applications.

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Original Articles

Basic Research
Effects of Microbiota on the Treatment of Obesity with the Natural Product Celastrol in Rats: Weiyue Hu, Lingling Wang, Guizhen Du, Quanquan Guan, Tianyu Dong, Ling Song, Yankai Xia, Xinru Wang; Diabetes Metab J. 2020;44(5):747-763. Published online May 11, 2020; DOI: https://doi.org/10.4093/dmj.2019.0124

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Background

Obesity has become one of the most serious issues threatening the health of humankind, and we conducted this study to examine whether and how celastrol protects against obesity.

Methods

We fed male Sprague-Dawley rats a high-fat diet and administered celastrol to obese rats for 3 weeks. By recording body weight (BW) and other measures, we identified the effective dose of celastrol for obesity treatment. Feces were collected to perform 16S rRNA sequencing, and hypothalami were extracted for transcriptome sequencing. We then treated leptin knockout rats with celastrol and explored the changes in energy metabolism. Male Institute of Cancer Research (ICR) mice were used to test the acute toxicity of celastrol.

Results

We observed that celastrol reduced BW and promoted energy expenditure at a dose of 500 µg/kg BW but that food intake was not changed after administration. The diversity of the gut microbiota was improved, with an increased ratio of Bacteroidetes to Firmicutes, and the gut microbiota played an important role in the anti-obesity effects of celastrol. Hypothalamic transcriptome analysis showed a significant enrichment of the leptin signaling pathway, and we found that celastrol significantly enhanced energy expenditure, which was mediated by the leptin signaling pathway. Acute lethal toxicity of celastrol was not observed at doses ranging from 0 to 62.5 mg/kg BW.

Conclusion

Our study revealed that celastrol decreased the BW of obese rats by enhancing energy expenditure but not by suppressing food intake and that this effect was mediated by the improvement of the gut microbiota and the activation of the hypothalamic leptin signaling pathway.

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Jia Gu, Ya-Ning Shi, Neng Zhu, Hong-Fang Li, Chan-Juan Zhang, Li Qin
Biomedicine & Pharmacotherapy.2023; 164: 114981. CrossRef
Tripterygium hypoglaucum extract ameliorates adjuvant-induced arthritis in mice through the gut microbiota
Jianghui HU, Jimin NI, Junping ZHENG, Yanlei GUO, Yong YANG, Cheng YE, Xiongjie SUN, Hui XIA, Yanju LIU, Hongtao LIU
Chinese Journal of Natural Medicines.2023; 21(10): 730. CrossRef
Health improvements of type 2 diabetic patients through diet and diet plus fecal microbiota transplantation
Lili Su, Zhifan Hong, Tong Zhou, Yuanyuan Jian, Mei Xu, Xuanping Zhang, Xiaoyan Zhu, Jiayin Wang
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Pharmacological Research - Modern Chinese Medicine.2022; 3: 100094. CrossRef
Celastrol: An Update on Its Hepatoprotective Properties and the Linked Molecular Mechanisms
Mengzhen Li, Faren Xie, Lu Wang, Guoxue Zhu, Lian-Wen Qi, Shujun Jiang
Frontiers in Pharmacology.2022;[Epub] CrossRef
Celastrol inhibits the proliferation and migration of MCF-7 cells through the leptin-triggered PI3K/AKT pathway
Pingping Chen, Bin Wang, Meng Li, Chunxue Cui, Fei Liu, Yonggang Gao
Computational and Structural Biotechnology Journal.2022; 20: 3173. CrossRef
Investigating Celastrol’s Anti-DCM Targets and Mechanisms via Network Pharmacology and Experimental Validation
Rui Xi, Yongxin Wan, Lihong Yang, Jingying Zhang, Liu Yang, Shuai Yang, Rui Chai, Fengchen Mu, Qiting Sun, Rui Yan, Zhifang Wu, Sijin Li, Zhijun Liao
BioMed Research International.2022; 2022: 1. CrossRef
Celastrol inhibits TXNIP expression to protect pancreatic β cells in diabetic mice
Si-wei Wang, Tian Lan, Fang Zheng, Hui Huang, Hang-fei Chen, Qi Wu, Feng Zhang
Phytomedicine.2022; 104: 154316. CrossRef
Celastrol: A Promising Agent Fighting against Cardiovascular Diseases
Zhexi Li, Jingyi Zhang, Xulei Duan, Guoan Zhao, Min Zhang
Antioxidants.2022; 11(8): 1597. CrossRef
Celastrol: A lead compound that inhibits SARS‐CoV‐2 replication, the activity of viral and human cysteine proteases, and virus‐induced IL‐6 secretion
Carlos A. Fuzo, Ronaldo B. Martins, Thais F. C. Fraga‐Silva, Martin K. Amstalden, Thais Canassa De Leo, Juliano P. Souza, Thais M. Lima, Lucia H. Faccioli, Débora Noma Okamoto, Maria Aparecida Juliano, Suzelei C. França, Luiz Juliano, Vania L. D. Bonato,
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In vitro activity of celastrol in combination with thymol against carbapenem-resistant Klebsiella pneumoniae isolates
Mahmoud Saad Abdel-Halim, Momen Askoura, Basem Mansour, Galal Yahya, Amira M. El-Ganiny
The Journal of Antibiotics.2022; 75(12): 679. CrossRef
Celastrol alleviates metabolic disturbance in high‐fat diet‐induced obese mice through increasing energy expenditure by ameliorating metabolic inflammation
Xueping Yang, Fan Wu, Lingli Li, Ernest C. Lynch, Linglin Xie, Yan Zhao, Ke Fang, Jingbin Li, Jinlong Luo, Lijun Xu, Xin Zou, Fuer Lu, Guang Chen
Phytotherapy Research.2021; 35(1): 297. CrossRef
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Shaohua Xu, Yaqian Feng, Weishen He, Wen Xu, Wei Xu, Hongjun Yang, Xianyu Li
Pharmacological Research.2021; 167: 105572. CrossRef
The Anti-Obesity Effect of Traditional Chinese Medicine on Lipid Metabolism
Qijing Fan, Furong Xu, Bin Liang, Xiaoju Zou
Frontiers in Pharmacology.2021;[Epub] CrossRef
Serum Metabolome Mediates the Antiobesity Effect of Celastrol-Induced Gut Microbial Alterations
Shaohua Xu, Liwei Lyu, Huaichang Zhu, Xiaoqiang Huang, Wei Xu, Wen Xu, Yaqian Feng, Yong Fan
Journal of Proteome Research.2021; 20(10): 4840. CrossRef
Interrelated Mechanism by Which the Methide Quinone Celastrol, Obtained from the Roots of Tripterygium wilfordii, Inhibits Main Protease 3CLpro of COVID-19 and Acts as Superoxide Radical Scavenger
Francesco Caruso, Manrose Singh, Stuart Belli, Molly Berinato, Miriam Rossi
International Journal of Molecular Sciences.2020; 21(23): 9266. CrossRef

Basic Research
Role of Intestinal Microbiota in Metabolism of Voglibose In Vitro and In Vivo: Mahesh Raj Nepal, Mi Jeong Kang, Geon Ho Kim, Dong Ho Cha, Ju-Hyun Kim, Tae Cheon Jeong; Diabetes Metab J. 2020;44(6):908-918. Published online April 6, 2020; DOI: https://doi.org/10.4093/dmj.2019.0147

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Background

Voglibose, an α-glucosidase inhibitor, inhibits breakdown of complex carbohydrates into simple sugar units in intestine. Studies showed that voglibose metabolism in the liver might be negligible due to its poor intestinal absorption. Numerous microorganisms live in intestine and have several roles in metabolism and detoxification of various xenobiotics. Due to the limited information, the possible metabolism of voglibose by intestinal microbiota was investigated in vitro and in vivo.

Methods

For the in vitro study, different concentrations of voglibose were incubated with intestinal contents, prepared from both vehicle- and antibiotics-treated mice, to determine the decreased amount of voglibose over time by using liquid chromatography-mass spectrometry. Similarly, in vivo pharmacodynamic effect of voglibose was determined following the administration of voglibose and starch in vehicle- and antibiotic-pretreated non-diabetic and diabetic mice, by measuring the modulatory effects of voglibose on blood glucose levels.

Results

The in vitro results indicated that the remaining voglibose could be significantly decreased when incubated with the intestinal contents from normal mice compared to those from antibiotic-treated mice, which had less enzyme activities. The in vivo results showed that the antibiotic pretreatment resulted in reduced metabolism of voglibose. This significantly lowered blood glucose levels in antibiotic-pretreated mice compared to the control animals.

Conclusion

The present results indicate that voglibose would be metabolized by the intestinal microbiota, and that this metabolism might be pharmacodynamically critical in lowering blood glucose levels in mice.

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Review

Basic Research
Role of CRTC2 in Metabolic Homeostasis: Key Regulator of Whole-Body Energy Metabolism?: Hye-Sook Han, Yongmin Kwon, Seung-Hoi Koo; Diabetes Metab J. 2020;44(4):498-508. Published online March 5, 2020; DOI: https://doi.org/10.4093/dmj.2019.0200

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Cyclic adenosine monophosphate (cAMP) signaling is critical for regulating metabolic homeostasis in mammals. In particular, transcriptional regulation by cAMP response element-binding protein (CREB) and its coactivator, CREB-regulated transcription coactivator (CRTC), is essential for controlling the expression of critical enzymes in the metabolic process, leading to more chronic changes in metabolic flux. Among the CRTC isoforms, CRTC2 is predominantly expressed in peripheral tissues and has been shown to be associated with various metabolic pathways in tissue-specific manners. While initial reports showed the physiological role of CRTC2 in regulating gluconeogenesis in the liver, recent studies have further delineated the role of this transcriptional coactivator in the regulation of glucose and lipid metabolism in various tissues, including the liver, pancreatic islets, endocrine tissues of the small intestines, and adipose tissues. In this review, we discuss recent studies that have utilized knockout mouse models to delineate the role of CRTC2 in the regulation of metabolic homeostasis.

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