Improvement of ß-Cell Function After Switching From DPP-4 Inhibitors to Oral Semaglutide: SWITCH-SEMA2 Post Hoc Analysis.

CONTEXT: Whether continuation of dipeptidyl peptidase-4 inhibitors (DPP-4is) or switching to oral semaglutide is more beneficial for ß-cell function is unclear. OBJECTIVE: To assess the efficacy of switching from DPP-4is to oral semaglutide for ß-cell function compared with DPP-4i continuation. METHODS: Post hoc analysis of SWITCH-SEMA 2, a multicenter prospective randomized controlled trial on the switch to oral semaglutide vs DPP-4i continuation without dose adjustment for 24 weeks in subjects with type 2 diabetes treated with DPP-4is, was conducted. Changes in markers for glucose metabolism, including homeostatic model assessment (HOMA2) scores and disposition index (DI), were compared between the groups. RESULTS: A total of 146 subjects (semaglutide group, 69; DPP-4i group, 77) were analyzed. In the semaglutide group, glycemic control, liver enzyme deviations, and lipid profiles improved after 24 weeks. Regarding indices for ß-cell function, changes in HOMA2-ß as well as DI, reflecting the ability of ß-cells to compensate for insulin resistance, were significantly higher in the semaglutide group compared with the DPP-4i group (mean change, +10.4 vs +0.6 in HOMA2-ß [P = .001] and +0.09 vs 0.0 in DI [P < .001]). Improvement in DI in the semaglutide group was correlated significantly to changes in body mass index (BMI), HbA1c, and fatty liver index reflecting liver steatosis. Multiple linear regression analysis revealed that dose of semaglutide (≥ 7 mg/day), reduction in fatty liver index, and metformin nonuse were independently associated with improvement of DI. CONCLUSION: Switching to oral semaglutide ameliorated ß-cell function compared with DPP-4is, presumably via tissue-to-tissue crosstalk between liver and ß-cells.

Real-world clinical evidence of oral semaglutide on metabolic abnormalities in subjects with type 2 diabetes: a multicenter retrospective observational study (the Sapporo-Oral SEMA study).

Oral semaglutide has potent anti-hyperglycemic efficacy in phase III trials. However, the complicated dosing instructions hamper to use this drug; therefore, we evaluated the efficacy and safety of oral semaglutide in subjects with type 2 diabetes in a real-world clinical setting. In this multi-center retrospective observational study, we analyzed subjects with type 2 diabetes newly treated with an oral semaglutide for >6 months at four medical centers located in Sapporo, Japan. The changes in glycated hemoglobin, body weight, and other metabolic parameters were evaluated and any adverse event leading to semaglutide discontinuation were recorded from February 2021 to December 2022. This study was registered with the University Hospital Medical Information Network Center (UMIN000050583). Of 543 subjects who met the inclusion criteria, data for 434 subjects (age 55.5 ± 12.6 years; body mass index 29.6 ± 6.0 kg/m2) were analyzed. After a 6 months of observation period, semaglutide 3 mg, 7 mg, or 14 mg was used by 55 (12.7%), 241 (55.5%), and 138 (31.8%) of subjects, respectively. Both glycated hemoglobin and body weight significantly improved: 7.65 ± 1.11% to 6.88 ± 0.91% (p < 0.001) and 80.2 ± 19.2 kg to 77.6 ± 19.2 kg (p < 0.001), respectively. Efficacy was also confirmed in the subgroup switched from other anti-hyperglycemic agents, including dipeptidyl peptidase-4 inhibitors. In total, 154 subjects had symptomatic gastrointestinal symptoms and 39 (7.2%) were discontinued semaglutide due to the adverse events. None of the participants experienced severe hypoglycemic events. Oral semaglutide in subjects with type 2 diabetes improved glycemic control and body weight in a real-world clinical setting.

Switching from Conventional Fibrates to Pemafibrate Has Beneficial Effects on the Renal Function of Diabetic Subjects with Chronic Kidney Disease.

Background: Fibrates have renal toxicity limiting their use in subjects with chronic kidney disease (CKD). However, pemafibrate has fewer toxic effects on renal function. In the present analysis, we evaluated the effects of pemafibrate on the renal function of diabetic subjects with or without CKD in a real-world clinical setting. Methods: We performed a sub-analysis of data collected during a multi-center, prospective, observational study of the effects of pemafibrate on lipid metabolism in subjects with type 2 diabetes mellitus complicated by hypertriglyceridemia (the PARM-T2D study). The participants were allocated to add pemafibrate to their existing regimen (ADD-ON), switch from their existing fibrate to pemafibrate (SWITCH), or continue conventional therapy (CTRL). The changes in estimated glomerular filtration rate (eGFR) over 52 weeks were compared among these groups as well as among subgroups created according to CKD status. Results: Data for 520 participants (ADD-ON, n=166; SWITCH, n=96; CTRL, n=258) were analyzed. Of them, 56.7% had CKD. The eGFR increased only in the SWITCH group, and this trend was also present in the CKD subgroup (P<0.001). On the other hand, eGFR was not affected by switching in participants with severe renal dysfunction (G3b or G4) and/or macroalbuminuria. Multivariate analysis showed that being older and a switch from fenofibrate were associated with elevation in eGFR (both P<0.05). Conclusion: A switch to pemafibrate may be associated with an elevation in eGFR, but to a lesser extent in patients with poor renal function.

Positive association between the proinsulin-to-C-peptide ratio and prolonged hyperglycemic time in type 2 diabetes.

The proinsulin-to-C-peptide (PI:C) ratio is an index applied during the early stage of pancreatic ß-cell dysfunction. The aim of this study was to identify the characteristics associated with the PI:C ratio to discuss pancreatic ß-cell dysfunction progression during the natural course of type 2 diabetes and its relationship with glycemic management. This multicenter, prospective observational study included 272 outpatients with type 2 diabetes. Continuous glucose monitoring was performed and fasting blood samples were collected and analyzed. We identified the clinical factors associated with the PI:C ratio by multiple regression analysis. The mean age of the cohort was 68.0 years, mean hemoglobin A1c 7.1% (54 mmol/mol), and mean body mass index 24.9 kg/m2. Multiple regression analysis showed that a prolonged time above the target glucose range (>180 mg/dL) and high body mass index contributed to a high PI:C ratio. However, no associations were found between the PI:C ratio and glucose variability indices. These findings suggested that the PI:C ratio is positively associated with a prolonged hyperglycemic time in type 2 diabetes, whereas its relationship with glucose variability remains unclear.

Glycaemic control efficacy of switching from dipeptidyl peptidase-4 inhibitors to oral semaglutide in subjects with type 2 diabetes: A multicentre, prospective, randomized, open-label, parallel-group comparison study (SWITCH-SEMA 2 study).

AIM: To assess whether oral semaglutide provides better glycaemic control, compared with dipeptidyl peptidase-4 inhibitor (DPP-4i) continuation, in people with type 2 diabetes. MATERIALS AND METHODS: In this multicentre, open-label, prospective, randomized, parallel-group comparison study, participants receiving DPP-4is were either switched to oral semaglutide (3-14 mg/day) or continued on DPP-4is. The primary endpoint was the change in glycated haemoglobin (HbA1c) over 24 weeks. Secondary endpoints included changes in metabolic parameters and biomarkers, along with the occurrence of adverse events. Factors associated with HbA1c improvement were also explored. RESULTS: In total, 174 eligible participants were enrolled; 17 dropped out of the study. Consequently, 82 participants in the DPP-4i group and 75 participants in the semaglutide group completed the study and were included in the analysis. Improvement in HbA1c at week 24 was significantly greater when switching to semaglutide compared with DPP-4i continuation [-0.65 (95% confidence interval: -0.79, -0.51) vs. +0.05 (95% confidence interval: -0.07, 0.16) (p < .001)]. Body weight, lipid profiles and liver enzymes were significantly improved in the semaglutide group than in the DPP-4i continuation group. Multiple linear regression analysis revealed that baseline HbA1c and homeostasis model assessment 2-R were independently associated with HbA1c improvement after switching to semaglutide. Seven participants in the semaglutide group discontinued medication because of gastrointestinal symptoms. CONCLUSIONS: Although the potential for gastrointestinal symptoms should be carefully considered, switching from DPP-4is to oral semaglutide may be beneficial for glycaemic control and metabolic abnormalities in people with higher HbA1c and insulin resistance.

Positive association between proinsulin and fatty liver index in people with type 2 diabetes.

The post-hoc study, derived from our previous prospective observational study, investigated the association between fasting serum proinsulin levels and hepatic steatosis in people with type 2 diabetes. The severity of hepatic steatosis was assessed using the fatty liver index. A total of 268 participants were divided into three groups: low (n = 110), moderate (n = 75), and high fatty liver index (n = 83). In both the crude and age/sex-adjusted analysis, logarithm-transformed proinsulin was significantly higher in the high fatty liver index group than in the low or moderate groups (all p < 0.01). The moderate fatty liver index group showed higher logarithm-transformed proinsulin than the low group (both p < 0.01). Positive associations between proinsulin and fatty liver index shown in this study would support an involvement of hepato-pancreatic crosstalk in the pathophysiology of type 2 diabetes.

Fulminant ACTH decrease following diabetic ketoacidosis induced by immune checkpoint inhibitor combination therapy with nivolumab and ipilimumab: A case report.

RATIONALE: The increasing use of immune checkpoint inhibitors (ICIs) for treating malignant tumors result in the concomitant rise of immune-related adverse events (irAEs). This case report may provide useful insight to understanding the etiology of ICI-induced hypophysitis, a severe irAE leading to potentially fatal secondary adrenal insufficiency. PATIENT CONCERNS: An 81-year-old Japanese man was hospitalized for diabetic ketoacidosis following 4 courses of ICI combination therapy with nivolumab and ipilimumab for metastatic renal cell carcinoma. DIAGNOSIS: Insulin secretion was depleted, leading to diagnosis of fulminant type 1 diabetes. Adrenocorticotropic hormone (ACTH) and cortisol levels were very high (60.8 pmol/L and 1575 nmol/L, respectively) upon admission. ACTH and cortisol returned to normal ranges on the 2nd day. On the 8th day, an ACTH loading test showed intact cortisol response (peak value 519 nmol/L). However, on the 14th day, there was a sharp decrease in ACTH and cortisol levels (10.5 pmol/L and 47 nmol/L, respectively) accompanied by fatigue and a drop in blood pressure to 97/63 mm Hg. As secondary adrenal insufficiency was suspected, hydrocortisone replacement was initiated. An ACTH loading test on the 17th day revealed low cortisol peak (peak value 232 nmol/L), indicating sudden disruption of adrenal function. Magnetic resonance imaging showed no abnormal findings and there was no other pituitary hormone deficiency. These findings, along with the patient clinical course, suggest that secondary adrenal insufficiency was caused by acute ACTH producing cell destruction as an irAE associated with ICI therapy. INTERVENTIONS: The patient hyperglycemia and ketoacidosis were treated using extracellular fluid and insulin therapy. After development of adrenal insufficiency, hydrocortisone 20 mg was started, and the patient symptoms improved. OUTCOMES: He was continued on insulin therapy, hydrocortisone, and reinitiated nivolumab. LESSONS: This case provides a detailed course of the fulminant onset of ACTH deficiency during ICI administration, emphasizing the importance of close monitoring.

Chemogenetic Manipulation of Endogenous Proteins in Fission Yeast Using a Self-Localizing Ligand-Induced Protein Translocation System.

Cells sense extracellular stimuli through membrane receptors and process information through an intracellular signaling network. Protein translocation triggers intracellular signaling, and techniques such as chemically induced dimerization (CID) have been used to manipulate signaling pathways by altering the subcellular localization of signaling molecules. However, in the fission yeast Schizosaccharomyces pombe, the commonly used FKBP-FRB system has technical limitations, and therefore, perturbation tools with low cytotoxicity and high temporal resolution are needed. We here applied our recently developed self-localizing ligand-induced protein translocation (SLIPT) system to S. pombe and successfully perturbed several cell cycle-related proteins. The SLIPT system utilizes self-localizing ligands to recruit binding partners to specific subcellular compartments such as the plasma membrane or nucleus. We optimized the self-localizing ligands to maintain the long-term recruitment of target molecules to the plasma membrane. By knocking in genes encoding the binding partners for self-localizing ligands, we observed changes in the localization of several endogenous molecules and found perturbations in the cell cycle and associated phenotypes. This study demonstrates the effectiveness of the SLIPT system as a chemogenetic tool for rapid perturbation of endogenous molecules in S. pombe, providing a valuable approach for studying intracellular signaling and cell cycle regulation with an improved temporal resolution.

Preferable effects of pemafibrate on liver function and fibrosis in subjects with type 2 diabetes complicated with liver damage.

BACKGROUND: Pemafibrate has been reported to ameliorate lipid profiles and liver dysfunction. However, which patients derive benefit from the hepatoprotective effects of pemafibrate is unclear. METHODS: We conducted a sub-analysis of the PARM-T2D study where subjects with type 2 diabetes complicated by hypertriglyceridemia were prospectively treated with pemafibrate or conventional therapies for 52 weeks. From the original cohort, subjects who had metabolic-associated fatty liver disease without changing their treatment regimens for comorbidities were analyzed. Eligible subjects (n = 293) (average age 61.2 ± 11.7 years, 37.5% female) treated with pemafibrate (pemafibrate, n = 152) or controls who did not change their treatment regimens (controls, n = 141) were divided into three groups based on their alanine aminotransferase (ALT) levels: ALT ≤ upper normal limit (UNL) (pemafibrate, n = 65; controls, n = 50), UNL < ALT ≤ 2×UNL (pemafibrate, n = 58; controls, n = 54), and 2×UNL < ALT (pemafibrate, n = 29; controls, n = 27). RESULTS: Pemafibrate treatment significantly ameliorated ALT levels (from 29 to 22 U/L, p < 0.001 by Wilcoxon's signed-rank test) in the total cohort and subjects with high ALT levels (2×ULN < ALT), and improved liver fibrosis as assessed by the Fibrosis-4 index (mean change - 0.05 (95% confidence interval: -0.22 to - 0.02), p < 0.05 versus baseline by the Mann-Whitney U-test and p < 0.05 versus the ALT ≤ UNL group by the Kruskal-Wallis test followed by Dunn's post-hoc analysis). CONCLUSIONS: The hepatoprotective effects of pemafibrate were dominant in subjects with type 2 diabetes complicated with liver dysfunction. TRIAL REGISTRATION: This study was registered with the University Hospital Medical Information Network Center Clinical Trials Registry (UMIN000037385).

Effect of Switching to Once-Weekly Semaglutide on Non-Alcoholic Fatty Liver Disease: The SWITCH-SEMA 1 Subanalysis.

Non-alcoholic fatty liver disease (NAFLD) is an important common comorbidity in individuals with type 2 diabetes (T2DM). Although some glucagon-like peptide-1 receptor agonists (GLP-1RAs) have beneficial effects on NAFLD, the efficacy of once-weekly semaglutide has not been established. This was a subanalysis of the SWITCH-SEMA 1 study, a multicenter, prospective, randomized, parallel-group trial comparing switching from liraglutide or dulaglutide to once-weekly semaglutide in subjects with T2DM (SWITCH) versus continuing current GLP-1RAs (Continue) for 24 weeks. This subanalysis consisted of participants who were suspected to have NAFLD [fatty liver index (FLI) ≥ 30]. In total, 58 participants met the criteria of this subanalysis. There were no statistical differences in baseline characteristics between the SWITCH (n = 31) and Continue groups (n = 27). FLI significantly improved during treatment in the SWITCH group (68.6 to 62.7) but not in the Continue group (71.1 to 72.3) (p < 0.01). The improvement of FLI in the SWITCH group was greater in switching from dulaglutide to semaglutide and significantly correlated with older age (p = 0.016) and lower baseline FLI (p < 0.01). The multiple linear regression analysis revealed that the switch from dulaglutide was associated with an improvement in FLI (p = 0.041). Switching from conventional GLP-1RAs to once-weekly semaglutide might be beneficial for individuals with NAFLD complicated with T2DM.

Neuromedin B receptor as a potential therapeutic target for corticotroph adenomas.

PURPOSE: Cushing's disease (CD) results from autonomous adrenocorticotropic hormone (ACTH) secretion by corticotroph adenomas, leading to excessive cortisol production, ultimately affecting morbidity and mortality. Pasireotide is the only FDA approved tumor directed treatment for CD, but it is effective in only about 25% of patients, and is associated with a high rate of hyperglycemia. Neuromedin B (NMB), a member of the bombesin-like peptide family, regulates endocrine secretion and cell proliferation. Here, we assessed NMB and NMB receptor (NMBR) expression in human corticotroph adenomas and the effects of NMBR antagonist PD168368 on murine and human corticotroph tumors. METHODS: To investigate NMB and NMBR expression, real-time qPCR and immunostaining on human pathological specimens of corticotroph, non-functional and somatotroph adenomas were performed. The effects of PD168368 on hormone secretion and cell proliferation were studied in vitro, in vivo and in seven patient-derived corticotroph adenoma cells. NMB and NMBR were expressed in higher extent in human corticotroph adenomas compared with non-functional or somatotroph adenomas. RESULTS: In murine AtT-20 cells, PD168368 reduced proopiomelanocortin (Pomc) mRNA/protein expression and ACTH secretion as well as cell proliferation. In mice with tumor xenografts, tumor growth, ACTH and corticosterone were downregulated by PD168368. In patient-derived adenoma cells, PD168368 reduced POMC mRNA expression in four out of seven cases and ACTH secretion in two out of five cases. A PD168368-mediated cyclin E suppression was also identified in AtT-20 and patient-derived cells. CONCLUSION: NMBR antagonist represents a potential treatment for CD and its effect may be mediated by cyclin E suppression.

Favorable Effect of Pemafibrate on Insulin Resistance and ß-Cell Function in Subjects with Type 2 Diabetes and Hypertriglyceridemia: A Subanalysis of the PARM-T2D Study.

Pemafibrate, a novel selective peroxisome proliferator-activated receptor modulator, has beneficial effects on lipid metabolism. However, its effects on glucose metabolism in individuals with type 2 diabetes (T2DM) remain to be fully clarified. This was a subanalysis of the PARM-T2D study, a multicenter prospective observational study on the use of pemafibrate versus conventional therapy for 52 weeks in subjects with T2DM complicated with hypertriglyceridemia. The subanalysis included participants who did not change their treatment for diabetes and did not receive insulin or insulin secretagogues during the study period. Changes in glucose metabolism markers, including homeostatic model assessment (HOMA2) scores and disposition index, were assessed. A total of 279 participants (141 in the pemafibrate group; 138 in the control group) met the criteria for the subanalysis. There were no significant changes in HbA1c during the 52-week study period in both groups. However, the pemafibrate group showed significant improvements versus the control group for insulin resistance assessed by HOMA2-R (-0.15 versus 0.08; estimated treatment difference -0.23 (95% confidence interval -0.44, -0.02); p = 0.03) and maintenance of ß-cell function assessed by disposition index (0.015 versus -0.023; estimated treatment difference 0.037 (95% confidence interval 0.005, 0.069); p = 0.02). Correlation analyses showed that improvements in HOMA2-R and disposition index were significantly associated with improvements in lipid abnormalities and γ-glutamyl transpeptidase. In conclusion, pemafibrate reduced insulin resistance and maintained ß-cell function in subjects with T2DM and hypertriglyceridemia, presumably by improving lipid profiles and lipid-related hepatocyte stress.

Inverse association between glucose variability and body fat in type 2 diabetes with impaired endogenous insulin secretion assessed using continuous glucose monitoring: A prospective observational study.

AIM: To evaluate the contribution of body fat mass and serum adiponectin concentration to glucose variability (GV) stability in people with type 2 diabetes with impaired versus preserved endogenous insulin secretion. MATERIALS AND METHODS: This multicentre prospective observational study included 193 people with type 2 diabetes who underwent ambulatory continuous glucose monitoring, abdominal computed tomography and fasting blood sampling. A fasting C-peptide (FCP) concentration >2 ng/mL was defined as preserved endogenous insulin secretion. The participants were divided into high (FCP > 2 ng/mL) and low FCP subgroups (FCP ≤ 2 ng/mL). Multivariate regression analysis was performed in each subgroup. RESULTS: In the high FCP subgroup, the coefficient of variation (CV) in GV was unrelated to abdominal fat area. In the low FCP subgroup, a high CV was significantly related to small abdominal visceral fat area (ß = -0.11, standard error 0.03; P < 0.05) and to small subcutaneous fat area (ß = -0.09, standard error 0.04; P < 0.05). No significant relationship between serum adiponectin concentration and continuous glucose monitoring-related variables was found. CONCLUSIONS: The contribution of body fat mass to GV depends on the endogenous insulin secretion residue. A small body fat area has independent adverse effects on GV in people with type 2 diabetes and impaired endogenous insulin secretion.

Improvement of glycaemic control and treatment satisfaction by switching from liraglutide or dulaglutide to subcutaneous semaglutide in patients with type 2 diabetes: A multicentre, prospective, randomized, open-label, parallel-group comparison study (SWITCH-SEMA 1 study).

AIM: To investigate the effects of switching from liraglutide or dulaglutide to once-weekly semaglutide on glycaemic control and treatment satisfaction in patients with type 2 diabetes. MATERIALS AND METHODS: In this multicentre, open-labelled, prospective, randomized, parallel-group comparison study, patients treated with liraglutide 0.9-1.8 mg/day (plan A) or dulaglutide 0.75 mg/week (plan B) were either switched to semaglutide or continued current therapy. The primary endpoint was the mean change in glycated haemoglobin over 24 weeks. The secondary endpoints included the changes of Diabetes Treatment Satisfaction Questionnaire scores, body weight and metabolic indices. RESULTS: In total, 110 patients were enrolled, and 10 were excluded; therefore, 37 patients in plan A and 63 patients in plan B completed the study. Glycated haemoglobin levels were significantly reduced in the semaglutide group in both plans [plan A, 7.8% ± 1.0% to 7.8% ± 0.7% (liraglutide) vs. 7.9% ± 0.7% to 7.3% ± 0.7% (semaglutide), p < .01; plan B, 7.8% ± 1.0% to 7.9% ± 1.2% (dulaglutide) vs. 7.8% ± 0.8% to 7.1% ± 0.6% (semaglutide), p < .01]. Semaglutide also improved Diabetes Treatment Satisfaction Questionnaire scores in both groups (plan A, +0.1 vs. +8.3, p < .01; plan B, -1.2 vs. +3.5, p < .01). Switching from dulaglutide yielded greater reductions in body weight and improved metabolic parameters. CONCLUSIONS: Once-weekly semaglutide administration improved glycaemic control and treatment satisfaction after switching from liraglutide or dulaglutide. These results highlighted a useful treatment option for patients with metabolic abnormalities despite glucagon-like receptor-1 receptor agonist treatment.

Optical Control of Cell Signaling with Red/Far-Red Light-Responsive Optogenetic Tools in Caenorhabditis elegans.

Optogenetic techniques have been intensively applied to the nematode Caenorhabditis elegans to investigate its neural functions. However, as most of these optogenetics are responsive to blue light and the animal exhibits avoidance behavior to blue light, the application of optogenetic tools responsive to longer wavelength light has been eagerly anticipated. In this study, we report the implementation in C. elegans of a phytochrome-based optogenetic tool that responds to red/near-infrared light and manipulates cell signaling. We first introduced the SynPCB system, which enabled us to synthesize phycocyanobilin (PCB), a chromophore for phytochrome, and confirmed the biosynthesis of PCB in neurons, muscles, and intestinal cells. We further confirmed that the amount of PCBs synthesized by the SynPCB system was sufficient for photoswitching of phytochrome B (PhyB)-phytochrome interacting factor 3 (PIF3). In addition, optogenetic elevation of intracellular Ca2+ levels in intestinal cells induced a defecation motor program. These SynPCB system and phytochrome-based optogenetic techniques would be of great value in elucidating the molecular mechanisms underlying C. elegans behaviors.

Lipid Droplet Protein PLIN1 Regulates Inflammatory Polarity in Human Macrophages and is Involved in Atherosclerotic Plaque Development by Promoting Stable Lipid Storage.

AIM: Perilipins (PLINs), peripheral lipid droplet (LD) proteins, play important roles in lipid accumulation and maturation in adipocytes. The relationship between PLIN family proteins and macrophage polarization in atherosclerosis has not been elucidated. METHODS: The experiments used tissues from human arteries of 65 patients who had undergone a carotid endarterectomy, and cultured macrophages generated from healthy human peripheral blood mononuclear cells. RESULTS: Plaque immunohistochemistry demonstrated co-expression of PLIN1 and PLIN2 in both symptomatic (n=31) and asymptomatic patients (n=34). PLIN2 mRNA expression increased 3.38-fold in the symptomatic group compared with those from asymptomatic. PLIN1 was not expressed on small LDs at a shorter incubation but was on large LDs at longer incubation with oxidized LDL and VLDL, while PLIN2 was observed after 24 h and increased with a longer incubation in cultured M1 macrophage. In M2 macrophages, PLIN1 was seen as early as 24 h following incubation with VLDL, and LD size increased with longer incubation. PLIN1 overexpression increased the size of LDs in M1 macrophages, even after a short incubation, and reduced the RNA expression of TNFA, MMP2, ABCA1, and ABCG1 versus the M1 control. Conversely, silencing of PLIN1 in M2 macrophages had the opposite effects on LD size and RNA expression. CONCLUSION: There was a relationship between macrophage polarity, cytosolic LD size, and PLIN1/PLIN2 expression levels. PLIN2 was mainly expressed in arterial plaques in symptomatic stroke patients, and associated with the inflammatory phenotype of human macrophages, while PLIN1 expression is closely associated with plaque stability and the anti-inflammatory phenotype.

Add-on imeglimin versus metformin dose escalation regarding glycemic control in patients with type 2 diabetes treated with a dipeptidyl peptidase-4 inhibitor plus low-dose metformin: study protocol for a multicenter, prospective, randomized, open-label, parallel-group comparison study (MEGMI study).

INTRODUCTION: Imeglimin is a novel anti-hyperglycemic drug that improves both insulin resistance and insulin secretion. The effects of imeglimin on glycemic control were confirmed in phase III clinical trials, but little is known about its effectiveness in daily clinical practice settings, especially compared with metformin. Therefore, we aim to clarify the efficacy of imeglimin in patients with type 2 diabetes (T2D) being treated with a dipeptidyl peptidase-4 (DPP-4) inhibitor plus low-dose metformin. RESEARCH DESIGN AND METHODS: This is a multicenter, randomized, prospective, open-label, parallel-group trial. Seventy participants with T2D treated with a DPP-4 inhibitor plus metformin (500-1000 mg/day) for more than 12 weeks and a glycated hemoglobin (HbA1c) level of 52-85 mmol/mol (7.0%-9.9%) will be randomized to receive add-on imeglimin 1000 mg two times per day or metformin dose escalation for 24 weeks. Biochemical analyses and physical assessments will be performed at baseline and at the end of the study, and adverse events will be recorded. The primary endpoint is the change in HbA1c after 24 weeks. The secondary endpoints comprise the changes in blood pressure, pulse rate, body weight, abdominal circumference, and other laboratory parameters; the relationship between improvements of biological parameters including glycemic control and patient background characteristics; and side effects. RESULTS: This study will reveal new insights into the incorporation of imeglimin into the diabetes treatment strategy. CONCLUSIONS: This will be the first randomized controlled trial to compare the efficacy of adding imeglimin versus metformin dose escalation on glycemic control in patients with T2D. TRIAL REGISTRATION NUMBER: jRCT1011220005.

Effects of pemafibrate on lipid metabolism in patients with type 2 diabetes and hypertriglyceridemia: A multi-center prospective observational study, the PARM-T2D study.

AIMS: Pemafibrate, a novel selective peroxisome proliferator-activated receptor modulator, was shown to ameliorate lipid abnormalities in a phase III clinical trial of patients with type 2 diabetes mellitus (T2DM). However, its efficacy has not been demonstrated in real-world clinical practice in patients with T2DM. METHODS: We performed a multi-center prospective observational study of the use of pemafibrate in patients with T2DM and hypertriglyceridemia versus conventional therapy, with or without a fibrate. The primary outcomes were the changes from baseline in fasting serum triglyceride (TG) and high-density lipoprotein-cholesterol (HDL-C) concentrations at week 52. RESULTS: We recruited 650 patients, and data from 504 (252 per group) were analyzed after propensity score matching. In the pemafibrate group, both TG and HDL-C showed significant improvements (p < 0.001), and several indices reflecting TG-rich lipoproteins, low-density lipoprotein-cholesterol particle size, and liver enzyme elevations were significantly ameliorated compared with the control group, but there was no difference in glycemic control markers. One of the key secondary endpoints showed that switching from conventional fibrates to pemafibrate improved eGFR but increased uric acid concentration. CONCLUSIONS: In patients with T2DM, pemafibrate has superior effects on lipid profile as well as liver and renal dysfunction to conventional fibrates.