Study on pancreatic islet adaptation and gene expression during pregnancy in rats. 2010

Ying Xue, and Cuipin Liu, and Yu Xu, and Qinxin Yuan, and Kuanfeng Xu, and Xiaodong Mao, and Guofang Chen, and Xiaohong Wu, and Mathias D Brendel, and Chao Liu
Department of Endocrinology, First Affiliated Hospital of Nanjing Medical University, 210029 Nanjing, China.

During pregnancy, the pancreatic islets undergo major structural and functional changes in response to increased peripheral resistance to insulin. In this study, we investigated the adaptive changes of the pancreatic islet beta-cell mass during pregnancy in rats, and explored profiles of islet gene expression at various stages of pregnancy. Some differentially expressed genes were verified by RT-PCR and Real-time PCR. Our results showed that compared with the non-pregnant control group, insulin synthesis, glucose-stimulated insulin secretion, islet beta-cell proliferation, and islet size were all increased in pregnant rats. The study also demonstrated that expression of several-hundred islet genes were changed during pregnancy, especially at day 14.5. The differentially expressed genes identified were distributed into eight main categories according to their biological functions: (1) genes involved in apoptosis or tumor; (2) genes related to binding; (3) genes involved in metabolism; (4) genes related to cell cycle; (5) genes for signal transducer activity; (6) genes related to structural molecule activity; (7) genes involved in transcription regulator activity; (8) genes for transporter activity. Among these genes, regenerating islet-derived 3 alpha (Reg3a) was remarkably increased during pregnancy. We hypothesize that differentially expressed genes may play an important role in adaptation of pancreatic islets during pregnancy in rats. In addition, the markedly increased expression of gene Reg3a is probably related to islet regeneration.

UI MeSH Term Description Entries
D007328 Insulin A 51-amino acid pancreatic hormone that plays a major role in the regulation of glucose metabolism, directly by suppressing endogenous glucose production (GLYCOGENOLYSIS; GLUCONEOGENESIS) and indirectly by suppressing GLUCAGON secretion and LIPOLYSIS. Native insulin is a globular protein comprised of a zinc-coordinated hexamer. Each insulin monomer containing two chains, A (21 residues) and B (30 residues), linked by two disulfide bonds. Insulin is used as a drug to control insulin-dependent diabetes mellitus (DIABETES MELLITUS, TYPE 1). Iletin,Insulin A Chain,Insulin B Chain,Insulin, Regular,Novolin,Sodium Insulin,Soluble Insulin,Chain, Insulin B,Insulin, Sodium,Insulin, Soluble,Regular Insulin
D007515 Islets of Langerhans Irregular microscopic structures consisting of cords of endocrine cells that are scattered throughout the PANCREAS among the exocrine acini. Each islet is surrounded by connective tissue fibers and penetrated by a network of capillaries. There are four major cell types. The most abundant beta cells (50-80%) secrete INSULIN. Alpha cells (5-20%) secrete GLUCAGON. PP cells (10-35%) secrete PANCREATIC POLYPEPTIDE. Delta cells (~5%) secrete SOMATOSTATIN. Islands of Langerhans,Islet Cells,Nesidioblasts,Pancreas, Endocrine,Pancreatic Islets,Cell, Islet,Cells, Islet,Endocrine Pancreas,Islet Cell,Islet, Pancreatic,Islets, Pancreatic,Langerhans Islands,Langerhans Islets,Nesidioblast,Pancreatic Islet
D011247 Pregnancy The status during which female mammals carry their developing young (EMBRYOS or FETUSES) in utero before birth, beginning from FERTILIZATION to BIRTH. Gestation,Pregnancies
D011897 Random Allocation A process involving chance used in therapeutic trials or other research endeavor for allocating experimental subjects, human or animal, between treatment and control groups, or among treatment groups. It may also apply to experiments on inanimate objects. Randomization,Allocation, Random
D005260 Female Females
D005786 Gene Expression Regulation Any of the processes by which nuclear, cytoplasmic, or intercellular factors influence the differential control (induction or repression) of gene action at the level of transcription or translation. Gene Action Regulation,Regulation of Gene Expression,Expression Regulation, Gene,Regulation, Gene Action,Regulation, Gene Expression
D000073718 Pancreatitis-Associated Proteins C-type lectins that restrict growth of bacteria in the intestinal epithelia and have bactericidal activity against gram-positive and gram-negative bacteria. They also regulate proliferation and differentiation of KERATINOCYTES following injury. Human pancreatitis-associated protein-1 (Reg3a) is overexpressed by pancreatic ACINAR CELLS in patients with CHRONIC PANCREATITIS. It is also highly expressed by pancreatic, bladder, and gastrointestinal cancer cells and may serve as a diagnostic biomarker. Regenerating Islet-Derived Protein,Pancreatitis-Associated Protein,Pancreatitis-Associated Protein-1,Regenerating Islet-Derived Protein 3,Regenerating Islet-Derived Proteins,Islet-Derived Protein, Regenerating,Pancreatitis Associated Protein,Pancreatitis Associated Protein 1,Pancreatitis Associated Proteins,Protein, Pancreatitis-Associated,Protein, Regenerating Islet-Derived,Regenerating Islet Derived Protein,Regenerating Islet Derived Protein 3,Regenerating Islet Derived Proteins
D000078790 Insulin Secretion Production and release of insulin from PANCREATIC BETA CELLS that primarily occurs in response to elevated BLOOD GLUCOSE levels. Secretion, Insulin
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D000951 Antigens, Neoplasm Proteins, glycoprotein, or lipoprotein moieties on surfaces of tumor cells that are usually identified by monoclonal antibodies. Many of these are of either embryonic or viral origin. Neoplasm Antigens,Tumor Antigen,Tumor Antigens,Antigen, Tumor,Antigens, Tumor

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