Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

RNA-seq of pancreatic islets from pregnant mice

ABSTRACT: During pregnancy, the energy requirements of the fetus impose changes in maternal metabolism. Increasing insulin resistance in the mother maintains nutrient flow to the growing fetus, while prolactin and placental lactogen counterbalance this resistance and prevent maternal hyperglycemia by driving expansion of the maternal population of insulin-producing beta-cells. However, the exact mechanisms by which the lactogenic hormones drive beta-cell expansion remain uncertain. Here we show that serotonin acts downstream of lactogen signaling to drive beta-cell proliferation. Serotonin synthetic enzyme Tph1 and serotonin production increased sharply in beta-cells during pregnancy or after treatment with lactogens in vitro. Inhibition of serotonin synthesis by dietary tryptophan restriction or Tph inhibition blocked beta-cell expansion and induced glucose intolerance in pregnant mice without affecting insulin sensitivity. Expression of the Gq-linked serotonin receptor Htr2b in maternal islets increased during pregnancy and normalized just prior to parturition, while expression of the Gi-linked receptor Htr1d increased at the end of pregnancy and postpartum. Blocking Htr2b signaling in pregnant mice also blocked beta-cell expansion and caused glucose intolerance. These studies reveal an integrated signaling pathway linking beta-cell mass to anticipated insulin need during pregnancy. Modulators of this pathway, including medications and diet, may affect the risk of gestational diabetes. Analysis of poly(A)+ RNA from 3 biological replicates of pancreatic islets isolated from normal female and pregnant female mice

INSTRUMENT(S): Illumina Genome Analyzer

ORGANISM(S): Mus musculus

SUBMITTER: Hail Kim

PROVIDER: E-GEOD-21860 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Serotonin regulates pancreatic beta cell mass during pregnancy.

Kim Hail H Toyofuku Yukiko Y Lynn Francis C FC Chak Eric E Uchida Toyoyoshi T Mizukami Hiroki H Fujitani Yoshio Y Kawamori Ryuzo R Miyatsuka Takeshi T Kosaka Yasuhiro Y Yang Katherine K Honig Gerard G van der Hart Marieke M Kishimoto Nina N Wang Juehu J Yagihashi Soroku S Tecott Laurence H LH Watada Hirotaka H German Michael S MS

Nature medicine 20100627 7

During pregnancy, the energy requirements of the fetus impose changes in maternal metabolism. Increasing insulin resistance in the mother maintains nutrient flow to the growing fetus, whereas prolactin and placental lactogen counterbalance this resistance and prevent maternal hyperglycemia by driving expansion of the maternal population of insulin-producing beta cells. However, the exact mechanisms by which the lactogenic hormones drive beta cell expansion remain uncertain. Here we show that ser ...[more]

PMID: 20581837

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Project description:Abstract: Maternal drug abuse during pregnancy is a rapidly escalating societal problem. Psychostimulants, including amphetamine, cocaine and methamphetamine, are amongst the illicit drugs most commonly consumed by pregnant women. Neuropharmacology concepts posit that psychostimulants affect monoamine signaling in the nervous system by their affinities to neurotransmitter reuptake and vesicular transporters to heighten neurotransmitter availability extracellularly. Exacerbated dopamine signaling is particularly considered as a key determinant of psychostimulant action. Much less is known about possible adverse effects of these drugs on peripheral organs, and if in utero exposure induces life-long pathologies. Here, we addressed this question by combining human RNA-seq data with cellular and mouse models of neuroendocrine development. We show that episodic maternal exposure to psychostimulants during pregnancy coincident with the intrauterine specification of pancreatic β cells permanently reduces their ability of insulin production, leading to glucose intolerance in adult female but not male offspring. We link psychostimulant action specifically to serotonin signaling and implicate the sex-specific epigenetic reprogramming of serotonin-related gene regulatory networks upstream from the transcription factor Pet1/Fev as determinants of reduced insulin production. Synopsis: The abuse of illicit drugs is a major societal problem, including their continued use during pregnancy. Even though harmful effects of commonly-used psychostimulants to the unborn fetus have been postulated, if and how maternal exposure to illicit psychostimulants during pregnancy could reprogram the fetal pancreas and limit glucose metabolism and tolerance for life in affected offspring remain unknown. Here, we combine human and mouse data to outline the sex-specific epigenetic deregulation of serotonin signaling-related gene regulatory networks, which leads to reduced insulin production postnatally. • As little as episodic intrauterine psychostimulant exposure is sufficient to permanently limit beta cell function in postnatal female rather than mouse male offspring. • The serotonin transporter, rather than the dopamine transporter, is identified as a molecular target of psychostimulants in fetal beta cells and in beta cell-like cellular models. • Psychostimulants adversely affect protein serotonylation in beta-cell models. • Altered DNA methylation and accessibility link the life-long deregulation of transcription factors and genes shaping serotonin signaling with reduced functionality in beta cells.

Project description:Maternal obesity is linked with increased adverse outcomes for mother and fetus. However, the metabolic impact of excessive fat accumulation within the altered hormonal context of pregnancy is not well understood. We used a murine model of obesity, the high fat diet-fed C57BL/6J mouse to determine adipose tissue-mediated molecular mechanisms driving metabolic dysfunction throughout pregnancy. Remarkably, obese mice exhibited a normalization of visceral fat accumulation at late-stage pregnancy (-53%, P<0.001 E18.5) to achieve levels comparable in mass (per gram of body weight) to that of non pregnant, control diet fed mice. Moreover, whilst obese pregnant mice showed a marked glucose intolerance and apparent insulin resistance at mid-stage pregnancy (E14.5), glucose homeostasis converged with that of lean pregnant mice at late-stage pregnancy, suggesting an unexpected amelioration of the worsening metabolic dysfunction in obese pregnant mice. Transcriptomic analysis of the late-stage visceral fat indicated reduced de novo lipogenic drive (Me1, Fasn, Scd1, Dgat2), retinol metabolism (Rdh11, Rbp4) and inflammation (Mcp1, Tnfα) in obese pregnant mice that was confirmed functionally by their lower adipose proinflammatory macrophage density. Elevated expression of estrogen receptor a (ERα) in visceral adipose tissue was identified as potential unifying mechanism for the transcriptional changes and reduced adiposity of late stage obese pregnancy. Support for a role for ERα was provided by experiments showing that the ERα selective agonist PPT suppressed lipogenesis in primary mouse adipocytes and suppressed Me1, Fasn, SCD1 and Dgat2 mRNA levels in mature female human ChubS7 clonal fat cells. Our data reveal a novel role for elevated visceral adipocyte estrogen signaling as a protective mechanism against visceral fat hypertrophy and inflammation in late pregnancy. Pregnant high fat, pregnant control fat, non pregnant high fat, non pregnant control fat. Five biologial replictes each (20 samples).

Dataset Information

RNA-seq of pancreatic islets from pregnant mice

Publications

Serotonin regulates pancreatic beta cell mass during pregnancy.

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