The preprohormone expression profile of enteroendocrine cells following Roux-en-Y gastric bypass in rats

• Published in: Peptides (New York, N.Y. : 1980) N.Y. : 1980), 2019-08, Vol.118, p.170100-170100, Article 170100
• Main Authors: Zhang, Chen, Rigbolt, Kristoffer, Petersen, Søren Ljungberg, Biehl Rudkjær, Lise Christine, Schwahn, Uwe, Fernandez-Cachon, Maria Luisa, Bossart, Martin, Falkenhahn, Mechthilde, Theis, Stefan, Hübschle, Thomas, Schmidt, Thorsten, Just Larsen, Philip, Vrang, Niels, Jelsing, Jacob
• Format: Article
• Language: English
• Subjects: Animals; Cholecystokinin - genetics; Cholecystokinin - metabolism; Computational Biology; Endocrine hormones; Enteroendocrine Cells - metabolism; Gastric Bypass; Gastric Inhibitory Polypeptide - genetics; Gastric Inhibitory Polypeptide - metabolism; Immunohistochemistry; In Situ Hybridization; Laser Capture Microdissection; Male; Mice; Obesity - genetics; Obesity - metabolism; Obesity - surgery; Peptide Hormones - genetics; Peptide Hormones - metabolism; Protein Precursors - genetics; Protein Precursors - metabolism; Rats; Rats, Sprague-Dawley; RNA, Messenger - genetics; RNA, Messenger - metabolism; RNAseq; Roux-en-Y gastric bypass; Sequence Analysis, RNA; Somatostatin - genetics; Somatostatin - metabolism; Transcriptome - genetics
• ISSN: 0196-9781; 1873-5169
• DOI: 10.1016/j.peptides.2019.170100

[Display omitted] •Enteroendocrine cell (EEC) transcriptome analysis throughout the rat gut.•RYGB markedly changes EEC-specific preprohormone gene expression in the obese rat.•38 known and 16 predicted preprohormone genes were regulated by RYGB.•The regulated preprohormones may be targeted for treatment of obesity. Roux-en-Y gastric bypass (RYGB) leads to rapid remission of type 2 diabetes (T2D) and sustained body weight loss, but the underlying molecular mechanisms are still not fully understood. To further elucidate these mechanisms and identify potentially novel preprohormone encoding genes with anti-diabetic and/or anti-obesity properties, we performed a comprehensive analysis of gene expression changes in enteroendocrine cells after RYGB in diet-induced obese (DIO) rats. The mRNA expression profiles of enteroendocrine cell enriched samples were characterized at 9, 22 and 60 days after RYGB surgery in a DIO rat model. Enteroendocrine cells were identified by chromogranin A immunohistochemistry and isolated by laser capture microdissection (LCM) from five regions covering the full rostro-caudal extension of the gastrointestinal (GI) tract. RNA sequencing and bioinformatic analyses were subsequently applied to identify differentially expressed preprohormone encoding genes. From the analysis of enteroendocrine cell mRNA expression profiles, a total of 54 preprohormones encoding genes were found to be differentially regulated at one or more time-points following RYGB. These included well-known RYGB associated preprohormone genes (e.g. Gcg, Cck, Gip, Pyy and Sct) and less characterized genes with putative metabolic effects (e.g. Nmu, Guca2a, Guca2b, Npw and Adm), but also 16 predicted novel preprohormone genes. Among the list of gene transcripts, Npw, Apln and Fam3d were further validated using in situ mRNA hybridization and corresponding peptides were characterized for acute effects on food intake and glucose tolerance in mice. We present a comprehensive mRNA expression profile of chromogranin A positive enteroendocrine cells following RYGB in rats. The data provides a region-specific characterization of all regulated preprohormone encoding genes in the rat GI tract including 16 not hitherto known. The comprehensive catalogue of preprohormone expression changes may support our understanding of hormone mediated effects of RYGB on diabetes remission and body weight reduction.