M, merge. antibodies and (c) chromogenic substrates used. JDI-9-1270-s005.docx (21K) GUID:?161069AE-CB5E-4EBF-9AC6-3D6C1077C23D Abstract Aims/Introduction Pancreatic \cell area and the \ to \cell area ratio (/) might be associated with glucose tolerance. The aim was to clarify how these histological parameters change as glucose tolerance deteriorates. Materials and Methods We analyzed pancreatic tissues obtained from pancreatectomies of 43 patients. We evaluated the relationships between \cell area or the / and various clinical parameters. Additionally, we analyzed \cell proliferation and the expression patterns of various pancreatic transcription factors. Results The / in individuals with longstanding (previously diagnosed) type 2 diabetes (0.36 0.12) was higher than that in those with normal glucose tolerance (0.18 0.10; 0.01), impaired glucose tolerance (0.17 0.12; 0.05) and newly diagnosed diabetes (0.17 0.12; 0.05). In all participants, glycated hemoglobin (HbA1c) correlated with relative \cell area (= 0.010). Diabetes duration (= 0.004), HbA1c ( 0.001) and plasma glucose levels (= 0.008) were significantly correlated with the / in single regression analyses, and diabetes duration was the only independent and significant determinant in stepwise multiple regression analyses (= 0.006). The \cell Ki67\positive ratio in patients with HbA1c 6.5% was significantly higher than that in patients with HbA1c 6.5% (= 0.022). We identified \cells that expressed aristaless\related homeobox and \cells that did not express aristaless\related homeobox at all glucose Monodansylcadaverine tolerance stages. Aristaless\related homeobox and NK homeobox 6. 1 expression patterns varied in insulin and glucagon double\positive cells. Conclusions The pancreatic / increases after type 2 diabetes onset and correlates with diabetes duration. This change might occur through \cell proliferation and Monodansylcadaverine phenotypic changes in pancreatic endocrine cells. in humans. Human islet histological analysis has been primarily carried out using autopsy samples4, 6, 7 or samples obtained from pancreatectomy. Using autopsy samples, whole pancreatic tissue can be examined, whereas only part of the pancreas can be examined using operative samples. Additionally, the latter approach cannot exclude effects of various factors originating from primary diseases, such as inflammation. However, the latter approach has some advantages. It enables us to collect clinical characteristics of patients in detail11, 17, and obtain fresh tissue with which we can carry out precise examination of Ki67 staining18. In the present study, we analyzed human pancreatic tissues obtained from pancreatectomies in patients at various glucose tolerance stages. We evaluated the relationships between \cell area or the / and various clinical parameters. Additionally, we analyzed \cell proliferation and apoptosis. Furthermore, we assessed the expression patterns of various transcription factors that are crucial for pancreatic endocrine cell development, particularly aristaless\related homeobox (ARX), an \cell transcription factor19, 20, to detect the possibility of transdifferentiation and dedifferentiation in human pancreas. Methods Patients We enrolled 43 Japanese patients (25 men and 18 women) who had undergone pancreatic resection between 2008 and 2013 in the Department of Gastroenterological Surgery, Osaka University Monodansylcadaverine Hospital, Suita, Japan, and had agreed to participate in this study. The study protocol was approved by the ethics committee of Osaka University (approval number 13279\4), and was carried out in accordance with the Declaration of Helsinki. Informed consent was obtained from all patients. Diabetes patients treated with dipeptidyl peptidase\4 inhibitors or glucagon\like peptide\1 receptor agonists, patients with renal failure (estimated glomerular filtration rate 30 mL/min/1.73 m2) and patients with pancreatic endocrine tumors were excluded from this study. The flow chart of the patients disposition is shown in Figure S1. The mean age was 66 11 years, and the mean body mass index (BMI) was 21.5 2.8 kg/m2. A Ldb2 total of 33 patients underwent a 75\g oral glucose tolerance test (OGTT) 1C60 days before pancreatic resection. Glucose tolerance stages (normal glucose tolerance [NGT], impaired glucose tolerance [IGT] and newly diagnosed diabetes [new\diabetes]) were categorized based on the results of the test. One patient was diagnosed with new diabetes without the 75\g OGTT based on his fasting plasma glucose level and glycated hemoglobin (HbA1c). A total of 10 patients were diagnosed with longstanding type 2 diabetes (long\type 2 diabetes) because of their clinical history. Laboratory tests Preoperative insulin secretory capacity was evaluated by.
