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Function of Isolated Pancreatic Islets from Patients at Onset Of Diabetes Title page “Function of isolated pancreatic islets from patients at onset of type 1 diabetes; Insulin secretion can be restored after some days in a non-diabetogenic environment in vitro. Results from the DiViD study” Short running title: “In vitro studies of islets from type 1 diabetes patients” List of authors Lars Krogvold,1,2,* Oskar Skog,3 Görel Sundström,4 Bjørn Edwin,2,5 Trond Buanes,2,6 Kristian F Hanssen,2,7 Johnny Ludvigsson,8 Manfred Grabherr,4 Olle Korsgren,3 and Knut Dahl-Jørgensen1,2 1Paediatric Department, Oslo University Hospital 2Faculty of Medicine, University of Oslo, Norway 3Department of Immunology, Genetics and Pathology, Uppsala University, Sweden 4Department of Medical Biochemistry and Microbiology, Uppsala University, Sweden 5The Intervention Centre and Department of Surgery, Oslo University Hospital 6Division of Cancer, Surgery and Transplantation, Oslo University Hospital 7Department of Endocrinology, Oslo University Hospital 8Division of Paediatrics, Department of Clinical Experimental Medicine, Linköping University, Sweden *Corresponding author: Lars Krogvold, Paediatric Department, Oslo University Hospital HF, P. O. Box 4950 Nydalen, N-0424 Oslo, Norway Phone: +4797522277. Fax number: +4723015790. E-mail: [email protected] LK, OS and GS contributed equally to the manuscript and are listed in alphabetical order. KDJ and OK contributed equally to the manuscript. KDJ is Principal Investigator of DiViD-study. Word count, manuscript: 2024 Number of tables: 0 (1 online supplemental table) Number of figures: 3 (1 online supplemental figure) 1 Diabetes Publish Ahead of Print, published online February 12, 2015 Diabetes Page 2 of 24 Abstract: The understanding of the etiology of type 1 diabetes (T1D) remains limited. One objective of the Diabetes Virus Detection-study (DiViD) was to collect pancreatic tissue from living subjects shortly after the diagnosis of T1D. Here we report the insulin secretion ability by in vitro glucose perifusion and explore the expression of insulin pathway genes in isolated islets of Langerhans from these patients. Whole genome RNA sequencing was performed on islets from six DiViD patients and two organ donors that died at the onset of T1D and compared with findings in three non- diabetic organ donors. All human transcripts involved in the insulin pathway were present in the islets at onset of T1D. Glucose-induced insulin secretion was present in some patients at the onset of T1D, and a perfectly normalized biphasic insulin release was obtained after some days in a non-diabetogenic environment in vitro. This indicates that the potential for endogenous insulin production is good, which could be taken advantage of if the disease process was reversed at diagnosis. 2 Page 3 of 24 Diabetes Our understanding of the etiology of type 1 diabetes remains limited (1). Animal models show only partial similarities with the human disease (2), and there has been lack of well-preserved human tissue samples (3). The functionality of islets of Langerhans at onset of type 1 diabetes in humans remains poorly characterized. Previous in vitro studies (4;5) have shown function of islet cells obtained several months after diagnosis but so far there has been lack of in vitro access to isolated islets obtained from subjects at onset of type 1 diabetes required to obtain in-depth understanding. Studies demonstrating the gene expression profiles for the human pancreas and purified islets in type 1 diabetes have been published, providing interesting data supporting that type 1 diabetes is caused by a chronic inflammatory process with participation of innate immunity (6;7). The beta cells express and release cytokines and chemokines, providing a link between the beta cell and the immune system in early type 1 diabetes (8). However, these studies are based on few diseased cases, mainly including tissue from subjects with long-standing type 1 diabetes (6;7). Insulin secretion from islets obtained from non-diabetic human subjects exhibits a typical bi-phasic pattern when stimulated with glucose (9). At diagnosis most patients with type 1 diabetes have significant, but insufficient insulin secretion, even though 40-50% of the β-cells may be present (10) suggesting beta cell dysfunction (11;12). Endoplasmic reticulum (ER) stress causes beta cell dysfunction, suggestively by entrapment of the protein Wolfram syndrome 1 (WFS1), inhibiting the synthesis of cAMP and thereby the secretion of insulin (13). 3 Diabetes Page 4 of 24 Here we report the ability of insulin secretion and explore the expression of insulin pathway genes in isolated islets of Langerhans obtained from subjects with recent onset type 1 diabetes and non-diabetic controls. Materials and Methods Patients and pancreas donors Six patients (case 1-6), age 24-35 years who gave their written informed consent were recruited to the DiViD-study (14). In addition, the pancreases from two organ donors (case 7-8) who died at the onset of type 1 diabetes and from three organ donors (controls 1-3) without pancreatic disease were included in the study. Both donors with type 1 diabetes died of brain edema and total brain infarction described previously (15). Clinical data regarding cases and controls are shown in eTable 1. The Government’s Regional Ethics Committee in Norway and the Regional Ethics Committee in Uppsala approved the study. For details regarding the methods, see supplementary material. Results Islet function The mean glucose-stimulated insulin secretion (GSIS) was reduced in islets from type 1 diabetes subjects (Fig. 1A). GSIS was lowest when islets were examined day 1 after isolation but seemed to increase after 3 and 6 days of in vitro culture (Fig. 1A). Islets from individual subjects with type 1 diabetes had varying levels of GSIS (Fig. 1B). When examined day 1 after isolation, islets from all subjects except case 6 had a very low or undetectable GSIS (Fig. 1B). After 3 and 6 days of culture, islets from two of the subjects (Case 1 and 2) secreted slightly increased amount of insulin upon glucose 4 Page 5 of 24 Diabetes stimulation, but did not display biphasic insulin secretion, whereas islets from case 4 that displayed a poor GSIS one day after isolation, recovered to a normal biphasic secretion after 3 and 6 days of culture. Case 6 displayed a close-to-normal GSIS already one day after isolation, and the insulin secretion levels increased further after 3 and 6 days of culture (Fig. 1B). For the rest of the cases (3, 5, 7 and 8) the insulin secretion remained low or undetectable after culturing. Islets from non-diabetic subjects responded with a biphasic insulin release already on day one and were not further stimulated. Whole transcriptome sequencing We generated a total of 362 million reads and mapped those to the human genome. Both cases and controls generated approximately the same amount of mapable reads. The full data set (reads) is openly available on doi: 10.17044/BILS/g000002. When comparing expression similarities, using RPKM values, across all genes, islets from 5 of the 6 live subjects (Case 1-5, but not case 6) are grouped together and separate from the brain dead donors (case 7 and 8 and control 1-3), regardless of whether the islets are from type 1 diabetes or non-diabetic subjects (Fig. 2A), reflecting the major impact of brain death on the results obtained from the whole transcriptome analysis. Similarly, genes that are part of the complement system pathway also reflect the differences between islets from live and brain dead subjects (Fig. 2B). By contrast, the insulin secretion pathway groups islet samples by type 1 diabetes or not, notably resulting in longer branch lengths compared to the complement system pathway (Fig. 2C). 5 Diabetes Page 6 of 24 In all cases, except case 6, the genes that (according to KEGG database) is involved in the secretion of insulin, the insulin pathway, were less expressed when compared to the controls (Fig. 3). That includes all the genes in the insulin pathway, both the insulin gene INS itself, and the genes involved in production and release of insulin. In case 6, all the genes in the pathway were up-regulated compared to the non-diabetic controls. INS is about ten-fold lower expressed in all other diabetic samples, together with lowered expression of two upstream regulators, the pancreatic and duodenal homeobox 1 (PDX1), and MAFA, a transcription factor that binds RIPE3b, a conserved enhancer element that regulates pancreatic beta cell-specific expression of INS (16). Additional genes that are consistently lower in expression include (a) the adenylate cyclase activating polypeptide (PACAP) and its receptor PACAPR; (b) FFAR1, a member of the GPR40 family of G protein-coupled receptors and may be involved in the metabolic regulation of insulin secretion; (c) G-protein controlled integral membrane protein and inward-rectifier type potassium channel (KCNJ11); (d) ATP-binding cassette transporter of the MRP subfamily (ABCC8), which is involved in multi-drug resistance but also functions as a modulator of ATP-sensitive potassium channels and insulin release; (e) calcium-activated nonselective ion channel that mediates transport of monovalent cations across membranes (TRPM4); and (f) three major glucose transporters in the mammalian blood-brain barrier, which are found primarily in the cell membrane and on the cell surface, where they also function as receptors for human T-cell leukemia virus I and II (GLUT1/2/3). By contrast, the muscarinic cholinergic receptor CHRM3, and the G-protein coupled receptor CCKAR, which binds non-sulfated members of the cholecystokinin family of peptide hormones and acts as a major physiologic mediator of pancreatic enzyme secretion, are unchanged in expression, or slightly more highly expressed. 6 Page 7 of 24 Diabetes Discussion The results show that the expression of key regulatory elements, the insulin pathway and the GSIS were reduced in islets isolated from 7 of the 8 subjects with type 1 diabetes compared to islets from non-diabetic organ donors.
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