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Lalonde C, Sreetharan S, Murray A, Stoa L, Cybulski ME, Kennedy A, Landry N, Stillar A, Khurana S, Tharmalingam S, Wilson J, Khaper N, Lees SJ, Boreham D, Tai TC. Absence of Depressive and Anxious Behavior with Genetic Dysregulation in Adult C57Bl/6J Mice after Prenatal Exposure to Ionizing Radiation. Int J Mol Sci 2023; 24:ijms24108466. [PMID: 37239811 DOI: 10.3390/ijms24108466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 04/29/2023] [Accepted: 05/01/2023] [Indexed: 05/28/2023] Open
Abstract
The exposure of ionizing radiation during early gestation often leads to deleterious and even lethal effects; however, few extensive studies have been conducted on late gestational exposures. This research examined the behavior al effects of C57Bl/6J mouse offspring exposed to low dose ionizing gamma irradiation during the equivalent third trimester. Pregnant dams were randomly assigned to sham or exposed groups to either low dose or sublethal dose radiation (50, 300, or 1000 mGy) at gestational day 15. Adult offspring underwent a behavioral and genetic analysis after being raised under normal murine housing conditions. Our results indicate very little change in the behavioral tasks measuring general anxiety, social anxiety, and stress-management in animals exposed prenatally across the low dose radiation conditions. Quantitative real-time polymerase chain reactions were conducted on the cerebral cortex, hippocampus, and cerebellum of each animal; results indicate some dysregulation in markers of DNA damage, synaptic activity, reactive oxygen species (ROS) regulation, and methylation pathways in the offspring. Together, our results provide evidence in the C57Bl/6J strain, that exposure to sublethal dose radiation (<1000 mGy) during the last period of gestation leads to no observable changes in behaviour when assessed as adults, although some changes in gene expression were observed for specific brain regions. These results indicate that the level of oxidative stress occurring during late gestation for this mouse strain is not sufficient for a change in the assessed behavioral phenotype, but results in some modest dysregulation of the genetic profile of the brain.
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Affiliation(s)
- Christine Lalonde
- Biomolecular Sciences, Laurentian University, Sudbury, ON P3E2C6, Canada
- School of Natural Sciences, Laurentian University, Sudbury, ON P3E2C6, Canada
- Medical Sciences Division, NOSM University, Sudbury, ON P3E2C6, Canada
| | - Shayenthiran Sreetharan
- Medical Sciences Division, NOSM University, Sudbury, ON P3E2C6, Canada
- Department of Biology, McMaster University, Hamilton, ON L8S4L8, Canada
| | - Alyssa Murray
- School of Natural Sciences, Laurentian University, Sudbury, ON P3E2C6, Canada
- Medical Sciences Division, NOSM University, Sudbury, ON P3E2C6, Canada
| | - Lisa Stoa
- Department of Biology, McMaster University, Hamilton, ON L8S4L8, Canada
| | | | - Allison Kennedy
- Medical Sciences Division, NOSM University, Sudbury, ON P3E2C6, Canada
| | - Nicholas Landry
- Department of Psychology, Nipissing University, North Bay, ON P1B8L7, Canada
| | - Amy Stillar
- Department of Psychology, Nipissing University, North Bay, ON P1B8L7, Canada
| | - Sandhya Khurana
- Medical Sciences Division, NOSM University, Sudbury, ON P3E2C6, Canada
| | - Sujeenthar Tharmalingam
- Biomolecular Sciences, Laurentian University, Sudbury, ON P3E2C6, Canada
- School of Natural Sciences, Laurentian University, Sudbury, ON P3E2C6, Canada
- Medical Sciences Division, NOSM University, Sudbury, ON P3E2C6, Canada
| | - Joanna Wilson
- Department of Biology, McMaster University, Hamilton, ON L8S4L8, Canada
| | - Neelam Khaper
- Biomolecular Sciences, Laurentian University, Sudbury, ON P3E2C6, Canada
- Medical Sciences Division, NOSM University, Sudbury, ON P3E2C6, Canada
| | - Simon J Lees
- Medical Sciences Division, NOSM University, Sudbury, ON P3E2C6, Canada
| | - Douglas Boreham
- Biomolecular Sciences, Laurentian University, Sudbury, ON P3E2C6, Canada
- School of Natural Sciences, Laurentian University, Sudbury, ON P3E2C6, Canada
- Medical Sciences Division, NOSM University, Sudbury, ON P3E2C6, Canada
| | - T C Tai
- Biomolecular Sciences, Laurentian University, Sudbury, ON P3E2C6, Canada
- School of Natural Sciences, Laurentian University, Sudbury, ON P3E2C6, Canada
- Medical Sciences Division, NOSM University, Sudbury, ON P3E2C6, Canada
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Murray A, Tharmalingam S, Khurana S, Lalonde C, Nguyen P, Tai TC. Effect of Prenatal Glucocorticoid Exposure on Circadian Rhythm Gene Expression in the Brains of Adult Rat Offspring. Cells 2022; 11:cells11101613. [PMID: 35626652 PMCID: PMC9139626 DOI: 10.3390/cells11101613] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Revised: 05/03/2022] [Accepted: 05/10/2022] [Indexed: 11/16/2022] Open
Abstract
Circadian clocks control many vital aspects of physiology from the sleep-wake cycle to metabolism. The circadian clock operates through transcriptional-translational feedback loops. The normal circadian signaling relies on a ‘master clock’, located in the suprachiasmatic nucleus (SCN), which synchronizes peripheral oscillators. Glucocorticoid receptor (GR) signaling has the ability to reset the phase of peripheral clocks. It has been shown that maternal exposure to glucocorticoids (GCs) can lead to modification of hypothalamic-pituitary-adrenal (HPA) function, impact stress-related behaviors, and result in a hypertensive state via GR activation. We previously demonstrated altered circadian rhythm signaling in the adrenal glands of offspring exposed to the synthetic GC, dexamethasone (Dex). Results from the current study show that prenatal exposure to Dex affects circadian rhythm gene expression in a brain region-specific and a sex-specific manner within molecular oscillators of the amygdala, hippocampus, paraventricular nucleus, and prefrontal cortex, as well as the main oscillator in the SCN. Results also show that spontaneously hypertensive rats (SHR) exhibited dysregulated circadian rhythm gene expression in these same brain regions compared with normotensive Wistar-Kyoto rats (WKY), although the pattern of dysregulation was markedly different from that seen in adult offspring prenatally exposed to GCs.
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Affiliation(s)
- Alyssa Murray
- Medical Sciences Division, NOSM University, 935 Ramsey Lake Rd., Sudbury, ON P3E 2C6, Canada; (A.M.); (S.T.); (S.K.); (C.L.)
- Department of Biology, Laurentian University, Sudbury, ON P3E 2C6, Canada;
| | - Sujeenthar Tharmalingam
- Medical Sciences Division, NOSM University, 935 Ramsey Lake Rd., Sudbury, ON P3E 2C6, Canada; (A.M.); (S.T.); (S.K.); (C.L.)
- Department of Biology, Laurentian University, Sudbury, ON P3E 2C6, Canada;
- Department of Chemistry and Biochemistry, Laurentian University, Sudbury, ON P3E 2C6, Canada
- Biomolecular Sciences Program, Laurentian University, Sudbury, ON P3E 2C6, Canada
| | - Sandhya Khurana
- Medical Sciences Division, NOSM University, 935 Ramsey Lake Rd., Sudbury, ON P3E 2C6, Canada; (A.M.); (S.T.); (S.K.); (C.L.)
| | - Christine Lalonde
- Medical Sciences Division, NOSM University, 935 Ramsey Lake Rd., Sudbury, ON P3E 2C6, Canada; (A.M.); (S.T.); (S.K.); (C.L.)
- Biomolecular Sciences Program, Laurentian University, Sudbury, ON P3E 2C6, Canada
| | - Phong Nguyen
- Department of Biology, Laurentian University, Sudbury, ON P3E 2C6, Canada;
| | - T. C. Tai
- Medical Sciences Division, NOSM University, 935 Ramsey Lake Rd., Sudbury, ON P3E 2C6, Canada; (A.M.); (S.T.); (S.K.); (C.L.)
- Department of Biology, Laurentian University, Sudbury, ON P3E 2C6, Canada;
- Department of Chemistry and Biochemistry, Laurentian University, Sudbury, ON P3E 2C6, Canada
- Biomolecular Sciences Program, Laurentian University, Sudbury, ON P3E 2C6, Canada
- Correspondence: ; Tel.: +1-705-662-7239
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Dupuy C, Castelnau P, Mavel S, Lefevre A, Nadal-Desbarats L, Bodard S, Busson J, Dufour-Rainfray D, Blasco H, Emond P, Galineau L. SHR/NCrl rats as a model of ADHD can be discriminated from controls based on their brain, blood, or urine metabolomes. Transl Psychiatry 2021; 11:235. [PMID: 33888684 PMCID: PMC8062531 DOI: 10.1038/s41398-021-01344-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Revised: 03/18/2021] [Accepted: 03/30/2021] [Indexed: 02/02/2023] Open
Abstract
Attention-Deficit Hyperactivity Disorder (ADHD) is one of the most common neurodevelopmental disorder characterized by inattention, impulsivity, and hyperactivity. The neurobiological mechanisms underlying ADHD are still poorly understood, and its diagnosis remains difficult due to its heterogeneity. Metabolomics is a recent strategy for the holistic exploration of metabolism and is well suited for investigating the pathophysiology of diseases and finding molecular biomarkers. A few clinical metabolomic studies have been performed on peripheral samples from ADHD patients but are limited by their access to the brain. Here, we investigated the brain, blood, and urine metabolomes of SHR/NCrl vs WKY/NHsd rats to better understand the neurobiology and to find potential peripheral biomarkers underlying the ADHD-like phenotype of this animal model. We showed that SHR/NCrl rats can be differentiated from controls based on their brain, blood, and urine metabolomes. In the brain, SHR/NCrl rats displayed modifications in metabolic pathways related to energy metabolism and oxidative stress further supporting their importance in the pathophysiology of ADHD bringing news arguments in favor of the Neuroenergetic theory of ADHD. Besides, the peripheral metabolome of SHR/NCrl rats also shared more than half of these differences further supporting the importance of looking at multiple matrices to characterize a pathophysiological condition of an individual. This also stresses out the importance of investigating the peripheral energy and oxidative stress metabolic pathways in the search of biomarkers of ADHD.
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Affiliation(s)
- Camille Dupuy
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
| | - Pierre Castelnau
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
- CHRU Tours, Tours, France
| | - Sylvie Mavel
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
| | - Antoine Lefevre
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
| | | | - Sylvie Bodard
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
| | - Julie Busson
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
| | - Diane Dufour-Rainfray
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
- CHRU Tours, Tours, France
| | - Helene Blasco
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
- CHRU Tours, Tours, France
| | - Patrick Emond
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
- CHRU Tours, Tours, France
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Lalonde C, Grandbois J, Khurana S, Murray A, Tharmalingam S, Tai TC. Late gestational exposure to dexamethasone and fetal programming of abnormal behavior in Wistar Kyoto rats. Brain Behav 2021; 11:e02049. [PMID: 33528889 PMCID: PMC8035474 DOI: 10.1002/brb3.2049] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 12/16/2020] [Accepted: 01/08/2021] [Indexed: 01/02/2023] Open
Abstract
INTRODUCTION Fetal programming was characterized a few decades ago, explaining the correlation of physiological phenotypes of offspring exposed to early-life stress. High acute or chronic prenatal stress can overwhelm the enzymatic placental barrier, inducing transcriptional changes in the fetus that can result in different adverse behavioral and physiological phenotypes. The current study investigates the impact of exposure to the synthetic glucocorticoid, dexamethasone, during late gestation on behavioral outcomes. METHODS Pregnant Wistar Kyoto rats were given daily subcutaneous injections from gestational days 15-21 of either dexamethasone (0.9% NaCl, 4% EtOH, 100 µg kg-1 day-1 ) or were physically manipulated as naïve controls. Pups were raised normally until 17 weeks of age and underwent the Porsolt swim task and elevated plus maze for depressive and anxiety-like behaviors, respectively. Neural tissue was preserved for genetic analysis using quantitative real-time polymerase chain reaction. RESULTS Statistical analyses show significant disruption of behavior and genetic profiles of offspring exposed to dexamethasone in-utero. Exposed animals spent more time immobile on the swim task and entered open arms of the elevated plus maze more often than their naïve counterparts. In the prefrontal cortex, there was a sex by treatment interaction on gene expression relevant to neural transmission in ryanodine receptor 2, as well as increased gene expression in SNAP25, COMT, and LSAMP in males prenatally exposed to dexamethasone compared with controls. Both dysregulated genes and behavior are linked to decreased anxiety and fear inhibition. CONCLUSION Our results indicate adult offspring exposed to dexamethasone in-utero have a tendency toward passive stress-coping strategies and an inhibition of anxiety on behavioral tasks. Methyltransferase activity, synaptic activity, and cellular processes were disrupted in the prefrontal cortices of these animals. Specifically, genes involved in emotional response pathways were overexpressed, supporting the link between the behavioral and genetic profiles. Combined, we determine that dexamethasone offspring have adaptive predispositions when faced with novel situations, with increased immobility in the swim task and increased exploration on the elevated plus maze.
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Affiliation(s)
- Christine Lalonde
- Biomolecular Sciences, Laurentian University, Sudbury, ON, Canada.,Division of Medical Sciences, Northern Ontario School of Medicine, Sudbury, ON, Canada
| | - Julie Grandbois
- Division of Medical Sciences, Northern Ontario School of Medicine, Sudbury, ON, Canada.,Department of Biology, Laurentian University, Sudbury, ON, Canada
| | - Sandhya Khurana
- Biomolecular Sciences, Laurentian University, Sudbury, ON, Canada
| | - Alyssa Murray
- Division of Medical Sciences, Northern Ontario School of Medicine, Sudbury, ON, Canada.,Department of Biology, Laurentian University, Sudbury, ON, Canada
| | - Sujeenthar Tharmalingam
- Biomolecular Sciences, Laurentian University, Sudbury, ON, Canada.,Division of Medical Sciences, Northern Ontario School of Medicine, Sudbury, ON, Canada.,Department of Biology, Laurentian University, Sudbury, ON, Canada.,Department of Chem/Biochem, Laurentian University, Sudbury, ON, Canada
| | - T C Tai
- Biomolecular Sciences, Laurentian University, Sudbury, ON, Canada.,Division of Medical Sciences, Northern Ontario School of Medicine, Sudbury, ON, Canada.,Department of Biology, Laurentian University, Sudbury, ON, Canada.,Department of Chem/Biochem, Laurentian University, Sudbury, ON, Canada
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Tharmalingam S, Khurana S, Murray A, Lamothe J, Tai TC. Whole transcriptome analysis of adrenal glands from prenatal glucocorticoid programmed hypertensive rodents. Sci Rep 2020; 10:18755. [PMID: 33127986 PMCID: PMC7603342 DOI: 10.1038/s41598-020-75652-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Accepted: 10/14/2020] [Indexed: 12/11/2022] Open
Abstract
Prenatal glucocorticoid exposure is associated with the development of hypertension in adults. We have previously demonstrated that antenatal dexamethosone (DEX) administration in Wistar-Kyoto dams results in offspring with increased blood pressure coupled with elevated plasma epinephrine levels. In order to elucidate the molecular mechanisms responsible for prenatal DEX-mediated programming of hypertension, a whole-transcriptome analysis was performed on DEX programmed WKY male adrenal glands using the Rat Gene 2.0 microarray. Differential gene expression (DEG) analysis of DEX-exposed offspring compared with saline-treated controls revealed 142 significant DEGs (109 upregulated and 33 downregulated genes). DEG pathway enrichment analysis demonstrated that genes involved in circadian rhythm signaling were most robustly dysregulated. RT-qPCR analysis confirmed the increased expression of circadian genes Bmal1 and Npas2, while Per2, Per3, Cry2 and Bhlhe41 were significantly downregulated. In contrast, gene expression profiling of Spontaneously Hypertensive (SHR) rats, a genetic model of hypertension, demonstrated decreased expression of Bmal1 and Npas2, while Per1, Per2, Per3, Cry1, Cry2, Bhlhe41 and Csnk1D were all upregulated compared to naïve WKY controls. Taken together, this study establishes that glucocorticoid programmed adrenals have impaired circadian signaling and that changes in adrenal circadian rhythm may be an underlying molecular mechanism responsible for the development of hypertension.
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Affiliation(s)
- Sujeenthar Tharmalingam
- Northern Ontario School of Medicine, Laurentian University, 935 Ramsey Lake Rd, Sudbury, ON, P3E 2C6, Canada.,Department of Biology, Laurentian University, Sudbury, ON, P3E 2C6, Canada.,Department of Chemistry and Biochemistry, Laurentian University, Sudbury, ON, P3E 2C6, Canada.,Biomolecular Sciences Program, Laurentian University, Sudbury, ON, P3E 2C6, Canada.,Health Sciences North Research Institute, Sudbury, ON, P3E 2H2, Canada
| | - Sandhya Khurana
- Northern Ontario School of Medicine, Laurentian University, 935 Ramsey Lake Rd, Sudbury, ON, P3E 2C6, Canada
| | - Alyssa Murray
- Northern Ontario School of Medicine, Laurentian University, 935 Ramsey Lake Rd, Sudbury, ON, P3E 2C6, Canada.,Department of Biology, Laurentian University, Sudbury, ON, P3E 2C6, Canada
| | - Jeremy Lamothe
- Northern Ontario School of Medicine, Laurentian University, 935 Ramsey Lake Rd, Sudbury, ON, P3E 2C6, Canada.,Biomolecular Sciences Program, Laurentian University, Sudbury, ON, P3E 2C6, Canada
| | - T C Tai
- Northern Ontario School of Medicine, Laurentian University, 935 Ramsey Lake Rd, Sudbury, ON, P3E 2C6, Canada. .,Department of Biology, Laurentian University, Sudbury, ON, P3E 2C6, Canada. .,Department of Chemistry and Biochemistry, Laurentian University, Sudbury, ON, P3E 2C6, Canada. .,Biomolecular Sciences Program, Laurentian University, Sudbury, ON, P3E 2C6, Canada.
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Sadhu N, Jhun EH, Posen A, Yao Y, He Y, Molokie RE, Wilkie DJ, Wang ZJ. Phenylethanolamine N-methyltransferase gene polymorphisms associate with crisis pain in sickle cell disease patients. Pharmacogenomics 2020; 21:269-278. [PMID: 32162598 DOI: 10.2217/pgs-2019-0096] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Aim: Phenylethanolamine N-methyltransferase (PNMT) catalyzes the conversion of sympathetic neurotransmitter norepinephrine to epinephrine. We examined the association of PNMT polymorphisms with acute and chronic pain in sickle cell disease (SCD). Methods: Utilization of emergency care owing to painful crisis was used as a marker for acute pain in 131 patients with SCD. Results: rs876493 A allele, rs2934965 T allele and rs2941523 G allele were significantly associated with decreased utilization (p ≤ 0.05). rs876493 A allele showed association with utilization in females (p = 0.003), not males (p = 0.803). rs2934965 T allele and rs2941523 G allele were predicted to cause loss of putative transcription factor binding sites. This is the first report of the association of PNMT polymorphisms with acute crisis pain in SCD. Together with our previous findings in catechol-o-methyltransferase, polymorphisms in catecholamine metabolizing enzymes appear to primarily influence acute pain in SCD.
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Affiliation(s)
- Nilanjana Sadhu
- Department of Biopharmaceutical Sciences, University of Illinois at Chicago College of Pharmacy, Chicago, IL 60607, USA
| | - Ellie H Jhun
- Department of Biopharmaceutical Sciences, University of Illinois at Chicago College of Pharmacy, Chicago, IL 60607, USA
| | - Andrew Posen
- Department of Biopharmaceutical Sciences, University of Illinois at Chicago College of Pharmacy, Chicago, IL 60607, USA
| | - Yingwei Yao
- Department of Biobehavioral Nursing Science, University of Florida College of Nursing, Gainesville, FL, USA
| | - Ying He
- Department of Biopharmaceutical Sciences, University of Illinois at Chicago College of Pharmacy, Chicago, IL 60607, USA.,Comprehensive Sickle Cell Center, Department of Medicine, University of Illinois at Chicago, Chicago, IL, USA
| | - Robert E Molokie
- Department of Biopharmaceutical Sciences, University of Illinois at Chicago College of Pharmacy, Chicago, IL 60607, USA.,Comprehensive Sickle Cell Center, Department of Medicine, University of Illinois at Chicago, Chicago, IL, USA.,Jesse Brown Veteran's Administration Medical Center, Chicago, IL, USA.,Division of Hematology/Oncology, University of Illinois at Chicago College of Medicine, Chicago, IL, USA
| | - Diana J Wilkie
- Department of Biobehavioral Nursing Science, University of Florida College of Nursing, Gainesville, FL, USA
| | - Zaijie J Wang
- Department of Biopharmaceutical Sciences, University of Illinois at Chicago College of Pharmacy, Chicago, IL 60607, USA.,Comprehensive Sickle Cell Center, Department of Medicine, University of Illinois at Chicago, Chicago, IL, USA
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Insights into sympathetic nervous system and GPCR interplay in fetal programming of hypertension: a bridge for new pharmacological strategies. Drug Discov Today 2020; 25:739-747. [PMID: 32032706 DOI: 10.1016/j.drudis.2020.01.019] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Revised: 01/07/2020] [Accepted: 01/29/2020] [Indexed: 12/18/2022]
Abstract
Cardiovascular diseases (CVDs) are the most common cause of death from noncommunicable diseases worldwide. In addition to the classical CVD risk factors related to lifestyle and/or genetic background, exposure to an adverse intrauterine environment compromises fetal development leading to low birth weight and increasing offspring susceptibility to develop CVDs later in life, particularly hypertension - a process known as fetal programming of hypertension (FPH). In FPH animal models, permanent alterations have been detected in gene expression, in the structure and function of heart and blood vessels, compromising cardiovascular physiology and favoring hypertension development. This review focuses on the role of the sympathetic nervous system and its interplay with G-protein-coupled receptors, emphasizing strategies that envisage the prevention and/or treatment of FPH through interventions in early life.
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Fetal programming of adrenal PNMT and hypertension by glucocorticoids in WKY rats is dose and sex-dependent. PLoS One 2019; 14:e0221719. [PMID: 31483805 PMCID: PMC6726223 DOI: 10.1371/journal.pone.0221719] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Accepted: 08/13/2019] [Indexed: 12/12/2022] Open
Abstract
Biochemical changes in utero may alter normal fetal development, resulting in disease later in life, a phenomenon known as fetal programming. Recent epidemiological studies link fetal programming to negative health outcomes, such as low birth weight and hypertension in adulthood. Here, we used a WKY rat model and studied the molecular changes triggered by prenatal glucocorticoid (GC) exposure on the development of hypertension, and on the regulation of phenylethanolamine N-methyl transferase (PNMT), the enzyme responsible for biosynthesis of epinephrine, and a candidate gene linked to hypertension. Clinically, high doses of the synthetic GC dexamethasone (DEX) are used to treat infant respiratory distress syndrome. Elevated maternal GCs have been correlated with fetal programming of hypertension. The aim of this study was to determine if lower doses of DEX would not lead to detrimental fetal programming effects such as hypertension. Our data suggests that prenatal stress programs for increased expression of PNMT and altered regulation of PNMT in males and females. Importantly, we identified that DEX mediated programming was more apparent in the male rats, and the lower dose 10μg/kg/day of DEX did not lead to changes in blood pressure (BP) in female rats suggesting that this dose is below the threshold for programming of hypertension. Furthermore, sex-specific differences were observed in regards to programming mechanisms that may account for hypertension in males.
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Phenylethanolamine N-methyltransferase gene expression in PC12 cells exposed to intermittent hypoxia. Neurosci Lett 2018; 666:169-174. [DOI: 10.1016/j.neulet.2017.12.056] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Revised: 12/23/2017] [Accepted: 12/26/2017] [Indexed: 11/22/2022]
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