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Qiu B, Zhong Z, Dou L, Xu Y, Zou Y, Weldon K, Wang J, Zhang L, Liu M, Williams KE, Spence JP, Bell RL, Lai Z, Yong W, Liang T. Knocking out Fkbp51 decreases CCl 4-induced liver injury through enhancement of mitochondrial function and Parkin activity. Cell Biosci 2024; 14:1. [PMID: 38167156 PMCID: PMC10763032 DOI: 10.1186/s13578-023-01184-3] [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: 08/28/2023] [Accepted: 12/12/2023] [Indexed: 01/05/2024] Open
Abstract
BACKGROUND AND AIMS Previously, we found that FK506 binding protein 51 (Fkbp51) knockout (KO) mice resist high fat diet-induced fatty liver and alcohol-induced liver injury. The aim of this research is to identify the mechanism of Fkbp51 in liver injury. METHODS Carbon tetrachloride (CCl4)-induced liver injury was compared between Fkbp51 KO and wild type (WT) mice. Step-wise and in-depth analyses were applied, including liver histology, biochemistry, RNA-Seq, mitochondrial respiration, electron microscopy, and molecular assessments. The selective FKBP51 inhibitor (SAFit2) was tested as a potential treatment to ameliorate liver injury. RESULTS Fkbp51 knockout mice exhibited protection against liver injury, as evidenced by liver histology, reduced fibrosis-associated markers and lower serum liver enzyme levels. RNA-seq identified differentially expressed genes and involved pathways, such as fibrogenesis, inflammation, mitochondria, and oxidative metabolism pathways and predicted the interaction of FKBP51, Parkin, and HSP90. Cellular studies supported co-localization of Parkin and FKBP51 in the mitochondrial network, and Parkin was shown to be expressed higher in the liver of KO mice at baseline and after liver injury relative to WT. Further functional analysis identified that KO mice exhibited increased ATP production and enhanced mitochondrial respiration. KO mice have increased mitochondrial size, increased autophagy/mitophagy and mitochondrial-derived vesicles (MDV), and reduced reactive oxygen species (ROS) production, which supports enhancement of mitochondrial quality control (MQC). Application of SAFit2, an FKBP51 inhibitor, reduced the effects of CCl4-induced liver injury and was associated with increased Parkin, pAKT, and ATP production. CONCLUSIONS Downregulation of FKBP51 represents a promising therapeutic target for liver disease treatment.
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Affiliation(s)
- Bin Qiu
- Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100021, China
- Department of Pharmacology, Yale University School of Medicine, New Haven, CI, 06520, USA
| | - Zhaohui Zhong
- General Surgery Department, Peking University People's Hospital, Beijing, 100032, China
| | - Longyu Dou
- Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100021, China
| | - Yuxue Xu
- Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100021, China
| | - Yi Zou
- Greehey Children's Cancer Research Institute, UT Health, San Antonio, TX, 78229, USA
| | - Korri Weldon
- Greehey Children's Cancer Research Institute, UT Health, San Antonio, TX, 78229, USA
| | - Jun Wang
- Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100021, China
| | - Lingling Zhang
- Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100021, China
| | - Ming Liu
- Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100021, China
| | - Kent E Williams
- Department of Medicine, Indiana University, School of Medicine, Indianapolis, 46202, USA
| | - John Paul Spence
- Department of Pediatrics, Indiana University, School of Medicine, Indianapolis, 46202, USA
| | - Richard L Bell
- Department of Psychiatry, Indiana University, School of Medicine, Indianapolis, 46202, USA
| | - Zhao Lai
- Greehey Children's Cancer Research Institute, UT Health, San Antonio, TX, 78229, USA
| | - Weidong Yong
- Department of Surgery, Indiana University, School of Medicine, Indianapolis, 46202, USA.
- Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100021, China.
| | - Tiebing Liang
- Department of Medicine, Indiana University, School of Medicine, Indianapolis, 46202, USA.
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Rees TA, Labastida-Ramírez A, Rubio-Beltrán E. Calcitonin/PAC 1 receptor splice variants: a blind spot in migraine research. Trends Pharmacol Sci 2023; 44:651-663. [PMID: 37543479 PMCID: PMC10529278 DOI: 10.1016/j.tips.2023.07.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Revised: 07/08/2023] [Accepted: 07/08/2023] [Indexed: 08/07/2023]
Abstract
The neuropeptides calcitonin gene-related peptide (CGRP) and pituitary adenylate cyclase-activating polypeptide (PACAP) and their receptors are linked to migraine neurobiology. Recent antimigraine therapeutics targeting the signaling of these neuropeptides are effective; however, some patients respond suboptimally, indicating an incomplete understanding of migraine pathophysiology. The CGRP- and PACAP-responsive receptors can be differentially spliced. It is known that receptor splice variants can have different pathophysiological effects in other receptor-mediated pain pathways. Despite considerable knowledge on the structural and pharmacological differences of the CGRP- and PACAP-responsive receptor splice variants and their expression in migraine-relevant tissues, their role in migraine is rarely considered. Here we shine a spotlight on the calcitonin and PACAP (PAC1) receptor splice variants and examine what implications they may have for drug activity and design.
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Affiliation(s)
- Tayla A Rees
- School of Biological Sciences, University of Auckland, Auckland, New Zealand; Maurice Wilkins Centre for Molecular Biodiscovery, University of Auckland, Auckland, New Zealand.
| | - Alejandro Labastida-Ramírez
- Headache Group, Wolfson Center for Age Related Diseases, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
| | - Eloisa Rubio-Beltrán
- Headache Group, Wolfson Center for Age Related Diseases, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
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3
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Ramos A, Granzotto N, Kremer R, Boeder AM, de Araújo JFP, Pereira AG, Izídio GS. Hunting for Genes Underlying Emotionality in the Laboratory Rat: Maps, Tools and Traps. Curr Neuropharmacol 2023; 21:1840-1863. [PMID: 36056863 PMCID: PMC10514530 DOI: 10.2174/1570159x20666220901154034] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 06/13/2022] [Accepted: 07/28/2022] [Indexed: 11/22/2022] Open
Abstract
Scientists have systematically investigated the hereditary bases of behaviors since the 19th century, moved by either evolutionary questions or clinically-motivated purposes. The pioneer studies on the genetic selection of laboratory animals had already indicated, one hundred years ago, the immense complexity of analyzing behaviors that were influenced by a large number of small-effect genes and an incalculable amount of environmental factors. Merging Mendelian, quantitative and molecular approaches in the 1990s made it possible to map specific rodent behaviors to known chromosome regions. From that point on, Quantitative Trait Locus (QTL) analyses coupled with behavioral and molecular techniques, which involved in vivo isolation of relevant blocks of genes, opened new avenues for gene mapping and characterization. This review examines the QTL strategy applied to the behavioral study of emotionality, with a focus on the laboratory rat. We discuss the challenges, advances and limitations of the search for Quantitative Trait Genes (QTG) playing a role in regulating emotionality. For the past 25 years, we have marched the long journey from emotionality-related behaviors to genes. In this context, our experiences are used to illustrate why and how one should move forward in the molecular understanding of complex psychiatric illnesses. The promise of exploring genetic links between immunological and emotional responses are also discussed. New strategies based on humans, rodents and other animals (such as zebrafish) are also acknowledged, as they are likely to allow substantial progress to be made in the near future.
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Affiliation(s)
- André Ramos
- Behavior Genetics Laboratory, Department of Cell Biology, Embryology and Genetics, Center of Biological Sciences, Federal University of Santa Catarina, Florianopolis, Brazil
| | - Natalli Granzotto
- Behavior Genetics Laboratory, Department of Cell Biology, Embryology and Genetics, Center of Biological Sciences, Federal University of Santa Catarina, Florianopolis, Brazil
- Graduate Program of Pharmacology, Center of Biological Sciences, Federal University of Santa Catarina, Florianopolis, Brazil
| | - Rafael Kremer
- Behavior Genetics Laboratory, Department of Cell Biology, Embryology and Genetics, Center of Biological Sciences, Federal University of Santa Catarina, Florianopolis, Brazil
- Graduate Program of Developmental and Cellular Biology, Center of Biological Sciences, Federal University of Santa Catarina, Florianopolis, Brazil
| | - Ariela Maína Boeder
- Behavior Genetics Laboratory, Department of Cell Biology, Embryology and Genetics, Center of Biological Sciences, Federal University of Santa Catarina, Florianopolis, Brazil
- Graduate Program of Pharmacology, Center of Biological Sciences, Federal University of Santa Catarina, Florianopolis, Brazil
| | - Julia Fernandez Puñal de Araújo
- Behavior Genetics Laboratory, Department of Cell Biology, Embryology and Genetics, Center of Biological Sciences, Federal University of Santa Catarina, Florianopolis, Brazil
- Graduate Program of Developmental and Cellular Biology, Center of Biological Sciences, Federal University of Santa Catarina, Florianopolis, Brazil
| | - Aline Guimarães Pereira
- Behavior Genetics Laboratory, Department of Cell Biology, Embryology and Genetics, Center of Biological Sciences, Federal University of Santa Catarina, Florianopolis, Brazil
- Graduate Program of Developmental and Cellular Biology, Center of Biological Sciences, Federal University of Santa Catarina, Florianopolis, Brazil
| | - Geison Souza Izídio
- Behavior Genetics Laboratory, Department of Cell Biology, Embryology and Genetics, Center of Biological Sciences, Federal University of Santa Catarina, Florianopolis, Brazil
- Graduate Program of Pharmacology, Center of Biological Sciences, Federal University of Santa Catarina, Florianopolis, Brazil
- Graduate Program of Developmental and Cellular Biology, Center of Biological Sciences, Federal University of Santa Catarina, Florianopolis, Brazil
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Sex-Related Differences in Voluntary Alcohol Intake and mRNA Coding for Synucleins in the Brain of Adult Rats Prenatally Exposed to Alcohol. Biomedicines 2022; 10:biomedicines10092163. [PMID: 36140264 PMCID: PMC9496239 DOI: 10.3390/biomedicines10092163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2022] [Revised: 08/17/2022] [Accepted: 08/29/2022] [Indexed: 11/24/2022] Open
Abstract
Maternal alcohol consumption is one of the strong predictive factors of alcohol use and consequent abuse; however, investigations of sex differences in response to prenatal alcohol exposure (PAE) are limited. Here we compared the effects of PAE throughout gestation on alcohol preference, state anxiety and mRNA expression of presynaptic proteins α-, β- and γ-synucleins in the brain of adult (PND60) male and female Wistar rats. Total RNA was isolated from the hippocampus, midbrain and hypothalamus and mRNA levels were assessed with quantitative RT-PCR. Compared with naïve males, naïve female rats consumed more alcohol in “free choice” paradigm (10% ethanol vs. water). At the same time, PAE produced significant increase in alcohol consumption and preference in males but not in females compared to male and female naïve groups, correspondingly. We found significantly lower α-synuclein mRNA levels in the hippocampus and midbrain of females compared to males and significant decrease in α-synuclein mRNA in these brain areas in PAE males, but not in females compared to the same sex controls. These findings indicate that the impact of PAE on transcriptional regulation of synucleins may be sex-dependent, and in males’ disruption in α-synuclein mRNA expression may contribute to increased vulnerability to alcohol-associated behavior.
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Anjos PAR, Marchette RCN, Kremer R, Granzotto N, Alves TM, Fadanni GP, Mazur FG, Anton EL, da Silva-Santos JE, Linder ÁE, Izídio GS. The influence of chromosome 4 on high ethanol consumption and blood pressure. Alcohol 2022; 102:1-10. [PMID: 35500756 DOI: 10.1016/j.alcohol.2022.04.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Revised: 04/06/2022] [Accepted: 04/18/2022] [Indexed: 11/16/2022]
Abstract
The Spontaneously Hypertensive Rats (SHR) strain was developed through selective breeding for high systolic blood pressure. In our laboratory, we established a congenic rat strain named SHR.Lewis-Anxrr16 (SLA16). The SLA16 rat strain is genetically identical to the SHR except for the inserted Anxrr16 region in chromosome 4. Our objective was to evaluate the influence of this genomic region on ethanol consumption and blood pressure. First, we exposed SHR and SLA16 male and female rats to ethanol consumption. Results showed that, regardless of strain, females consumed more ethanol than males during forced (10% v/v) and spontaneous ethanol consumption (SEC; 2.5-20% v/v). Then, females from both strains were used to evaluate sensitivity to ethanol. No strain differences in the loss of righting reflex were observed after ethanol treatment (3 g/kg, 20% w/v, intraperitoneal [i.p.]). But, in the triple test, female SHR rats presented lower sensitivity to the ethanol (1.2 g/kg, 14% w/v, i.p.). Surprisingly, female SHR rats also presented higher blood pressure after SEC (10% v/v). Finally, losartan treatment was effective in decreasing the blood pressure of female rats of both strains, but had specific effects on SHR ethanol consumption. Our data suggest that SLA16 female rats consume less ethanol (10%), are more sensitive to its effects, and present lower blood pressure than SHR female rats. We demonstrated that the Anxrr16 locus in chromosome 4 is a genetic candidate to explain high ethanol consumption and blood pressure, at least in females.
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Affiliation(s)
| | - Renata Cristina Nunes Marchette
- Department of Pharmacology - Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil; Neurobiology of Addiction Section, Integrative Neuroscience Branch, National Institute on Drug Abuse Intramural Program, Baltimore, MD, United States
| | - Rafael Kremer
- Department of Cellular Biology, Embryology, and Genetics - Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil; Department of Medicine - Federal University of Fronteira Sul, Passo Fundo, Rio Grande do Sul, Brazil
| | - Natalli Granzotto
- Department of Pharmacology - Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil
| | - Thalita Mello Alves
- Department of Cellular Biology, Embryology, and Genetics - Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil
| | - Guilherme Pasetto Fadanni
- Department of Pharmacology - Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil; Department of Cellular Biology, Embryology, and Genetics - Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil
| | - Fernando Gabriel Mazur
- Department of Cellular Biology, Embryology, and Genetics - Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil
| | - Elaine Leocádia Anton
- Department of Pharmacology - Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil
| | | | - Áurea Elizabeth Linder
- Department of Pharmacology - Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil
| | - Geison Souza Izídio
- Department of Pharmacology - Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil; Department of Cellular Biology, Embryology, and Genetics - Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil.
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Orihuel J, Capellán R, Roura-Martínez D, Ucha M, Ambrosio E, Higuera-Matas A. Δ 9-Tetrahydrocannabinol During Adolescence Reprograms the Nucleus Accumbens Transcriptome, Affecting Reward Processing, Impulsivity, and Specific Aspects of Cocaine Addiction-Like Behavior in a Sex-Dependent Manner. Int J Neuropsychopharmacol 2021; 24:920-933. [PMID: 34436576 PMCID: PMC8598305 DOI: 10.1093/ijnp/pyab058] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2021] [Revised: 08/13/2021] [Accepted: 08/24/2021] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Cannabis exposure during adolescence is associated with emotional and motivational alterations that may entail an enhanced risk of developing psychiatric disorders. In rodent models, exposure to cannabinoids during adolescence leads to increased self-administration of opiates and cocaine, however, the psychological and neural mechanisms and the sex-specificity of this phenomenon are largely unknown. METHODS We exposed male and female adolescent rats to Δ9-tetrahydrocannabinol (THC) and studied at adulthood the effects of such treatment on psychological processes related to reward, such as Pavlovian conditioned approach, Pavlovian to instrumental transfer, habit formation and waiting impulsivity. In the light of these data and given the involvement of the nucleus accumbens in the processes examined, we performed an RNASeq transcriptomic study and assessed cocaine addiction-like behavior. RESULTS THC exposure increased goal-tracking (in males and females) and enhanced Pavlovian to instrumental transfer (especially in males) but did not affect habit formation. THC-exposed rats exhibited subtle, state-dependent changes in premature responding in the 2-CSRTT task. RNASeq data showed gene expression alterations in a marked sex-specific manner. While no effects were found on the acquisition of cocaine self-administration or punished drug-seeking, rats exposed to THC self-administered more cocaine under a progressive ratio schedule (males), had a higher rebound upon returning to continuous access to the drug (females) and showed reduced drug-seeking after 30 days of withdrawal (females). CONCLUSIONS Adolescent THC affects specific aspects of reward- (and cocaine-) guided behavior and the function of a key brain region mediating these effects, in a remarkable sex-specific manner.
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Affiliation(s)
- Javier Orihuel
- Department of Psychobiology, School of Psychology, National University for Distance Learning (UNED), Madrid, Spain
| | - Roberto Capellán
- Department of Psychobiology, School of Psychology, National University for Distance Learning (UNED), Madrid, Spain
| | - David Roura-Martínez
- Department of Psychobiology, School of Psychology, National University for Distance Learning (UNED), Madrid, Spain
- Institut de Neurosciences de la Timone, Marseille, France
| | - Marcos Ucha
- Department of Psychobiology, School of Psychology, National University for Distance Learning (UNED), Madrid, Spain
| | - Emilio Ambrosio
- Department of Psychobiology, School of Psychology, National University for Distance Learning (UNED), Madrid, Spain
| | - Alejandro Higuera-Matas
- Department of Psychobiology, School of Psychology, National University for Distance Learning (UNED), Madrid, Spain
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Gargiulo AT, Pirino BE, Curtis GR, Barson JR. Effects of pituitary adenylate cyclase-activating polypeptide isoforms in nucleus accumbens subregions on ethanol drinking. Addict Biol 2021; 26:e12972. [PMID: 33020973 DOI: 10.1111/adb.12972] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 09/12/2020] [Accepted: 09/17/2020] [Indexed: 12/11/2022]
Abstract
While limited research has implicated the neuropeptide, pituitary adenylate cyclase-activating polypeptide (PACAP), in problematic alcohol use, the brain regions and isoforms involved in this effect remain to be determined. One region that has been found both to exhibit PACAP binding and, separately, to be involved in ethanol drinking is the nucleus accumbens (NAc). Thus, this study sought to characterize the effect of the PACAP isoforms in the NAc on ethanol drinking under the intermittent-access two-bottle-choice paradigm, in male and female Long-Evans rats. With microinjection into the medial NAc shell, PACAP-27 but not PACAP-38 was found to dose-dependently reduce binge-like ethanol drinking. In contrast, the PACAP receptor antagonist, PACAP (6-27), but not PACAP (6-38), enhanced ethanol drinking. This effect of PACAP was substance specific, as neither isoform in the NAc shell affected binge-like sucrose drinking. It was also anatomically specific, as PACAP-38 rather than PACAP-27 suppressed ethanol drinking when injected into the NAc core, and PACAP-27 instead enhanced drinking when injected into the caudal third of the medial NAc shell. Finally, while PACAP-38 in the NAc shell affected stress-related exploratory behavior, reducing time spent in the light chamber of a light-dark box, PACAP-27 did not significantly affect behavior in a light-dark box or open field. Together, these results, showing that PACAP-27 in the NAc shell attenuates binge-like ethanol drinking without affecting select stress-related behaviors, suggest that compounds related to this PACAP isoform should be investigated as potential novel therapeutics for the treatment of alcohol use disorder.
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Affiliation(s)
- Andrew T. Gargiulo
- Department of Neurobiology and Anatomy Drexel University College of Medicine Philadelphia Pennsylvania USA
| | - Breanne E. Pirino
- Department of Neurobiology and Anatomy Drexel University College of Medicine Philadelphia Pennsylvania USA
| | - Genevieve R. Curtis
- Department of Neurobiology and Anatomy Drexel University College of Medicine Philadelphia Pennsylvania USA
| | - Jessica R. Barson
- Department of Neurobiology and Anatomy Drexel University College of Medicine Philadelphia Pennsylvania USA
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Chang R, Hernandez J, Gastelum C, Guadagno K, Perez L, Wagner EJ. Pituitary Adenylate Cyclase-Activating Polypeptide Excites Proopiomelanocortin Neurons: Implications for the Regulation of Energy Homeostasis. Neuroendocrinology 2021; 111:45-69. [PMID: 32028278 DOI: 10.1159/000506367] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Accepted: 01/30/2020] [Indexed: 11/19/2022]
Abstract
OBJECTIVE We examined whether pituitary adenylate cyclase-activating polypeptide (PACAP) excites proopiomelanocortin (POMC) neurons via PAC1 receptor mediation and transient receptor potential cation (TRPC) channel activation. METHODS Electrophysiological recordings were done in slices from both intact male and ovariectomized (OVX) female PACAP-Cre mice and eGFP-POMC mice. RESULTS In recordings from POMC neurons in eGFP-POMC mice, PACAP induced a robust inward current and increase in conductance in voltage clamp, and a depolarization and increase in firing in current clamp. These postsynaptic actions were abolished by inhibitors of the PAC1 receptor, TRPC channels, phospholipase C, phosphatidylinositol-3-kinase, and protein kinase C. Estradiol augmented the PACAP-induced inward current, depolarization, and increased firing, which was abrogated by estrogen receptor (ER) antagonists. In optogenetic recordings from POMC neurons in PACAP-Cre mice, high-frequency photostimulation induced inward currents, depolarizations, and increased firing that were significantly enhanced by Gq-coupled membrane ER signaling in an ER antagonist-sensitive manner. Importantly, the PACAP-induced excitation of POMC neurons was notably reduced in obese, high-fat (HFD)-fed males. In vivo experiments revealed that intra-arcuate nucleus (ARC) PACAP as well as chemogenetic and optogenetic stimulation of ventromedial nucleus (VMN) PACAP neurons produced a significant decrease in energy intake accompanied by an increase in energy expenditure, effects blunted by HFD in males and partially potentiated by estradiol in OVX females. CONCLUSIONS These findings reveal that the PACAP-induced activation of PAC1 receptor and TRPC5 channels at VMN PACAP/ARC POMC synapses is potentiated by estradiol and attenuated under conditions of diet-induced obesity/insulin resistance. As such, they advance our understanding of how PACAP regulates the homeostatic energy balance circuitry under normal and pathophysiological circumstances.
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Affiliation(s)
- Rachel Chang
- Graduate College of Biomedical Sciences, Western University of Health Sciences, Pomona, California, USA
| | - Jennifer Hernandez
- College of Osteopathic Medicine of the Pacific, Western University of Health Sciences, Pomona, California, USA
| | - Cassandra Gastelum
- Graduate College of Biomedical Sciences, Western University of Health Sciences, Pomona, California, USA
| | - Kaitlyn Guadagno
- College of Osteopathic Medicine of the Pacific, Western University of Health Sciences, Pomona, California, USA
| | - Lynnea Perez
- Graduate College of Biomedical Sciences, Western University of Health Sciences, Pomona, California, USA
| | - Edward J Wagner
- Graduate College of Biomedical Sciences, Western University of Health Sciences, Pomona, California, USA,
- College of Osteopathic Medicine of the Pacific, Western University of Health Sciences, Pomona, California, USA,
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Szpirer C. Rat models of human diseases and related phenotypes: a systematic inventory of the causative genes. J Biomed Sci 2020; 27:84. [PMID: 32741357 PMCID: PMC7395987 DOI: 10.1186/s12929-020-00673-8] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Accepted: 07/09/2020] [Indexed: 12/13/2022] Open
Abstract
The laboratory rat has been used for a long time as the model of choice in several biomedical disciplines. Numerous inbred strains have been isolated, displaying a wide range of phenotypes and providing many models of human traits and diseases. Rat genome mapping and genomics was considerably developed in the last decades. The availability of these resources has stimulated numerous studies aimed at discovering causal disease genes by positional identification. Numerous rat genes have now been identified that underlie monogenic or complex diseases and remarkably, these results have been translated to the human in a significant proportion of cases, leading to the identification of novel human disease susceptibility genes, helping in studying the mechanisms underlying the pathological abnormalities and also suggesting new therapeutic approaches. In addition, reverse genetic tools have been developed. Several genome-editing methods were introduced to generate targeted mutations in genes the function of which could be clarified in this manner [generally these are knockout mutations]. Furthermore, even when the human gene causing a disease had been identified without resorting to a rat model, mutated rat strains (in particular KO strains) were created to analyze the gene function and the disease pathogenesis. Today, over 350 rat genes have been identified as underlying diseases or playing a key role in critical biological processes that are altered in diseases, thereby providing a rich resource of disease models. This article is an update of the progress made in this research and provides the reader with an inventory of these disease genes, a significant number of which have similar effects in rat and humans.
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Affiliation(s)
- Claude Szpirer
- Université Libre de Bruxelles, B-6041, Gosselies, Belgium.
- , Waterloo, Belgium.
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LaRese TP, Rheaume BA, Abraham R, Eipper BA, Mains RE. Sex-Specific Gene Expression in the Mouse Nucleus Accumbens Before and After Cocaine Exposure. J Endocr Soc 2019; 3:468-487. [PMID: 30746506 PMCID: PMC6364626 DOI: 10.1210/js.2018-00313] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Accepted: 01/09/2019] [Indexed: 12/18/2022] Open
Abstract
The nucleus accumbens plays a major role in the response of mammals to cocaine. In animal models and human studies, the addictive effects of cocaine and relapse probability have been shown to be greater in females. Sex-specific differential expression of key transcripts at baseline and after prolonged withdrawal could underlie these differences. To distinguish between these possibilities, gene expression was analyzed in four groups of mice (cycling females, ovariectomized females treated with estradiol or placebo, and males) 28 days after they had received seven daily injections of saline or cocaine. As expected, sensitization to the locomotor effects of cocaine was most pronounced in the ovariectomized mice receiving estradiol, was greater in cycling females than in males, and failed to occur in ovariectomized/placebo mice. After the 28-day withdrawal period, RNA prepared from the nucleus accumbens of the individual cocaine- or saline-injected mice was subjected to RNA sequencing analysis. Baseline expression of 3% of the nucleus accumbens transcripts differed in the cycling female mice compared with the male mice. Expression of a similar number of transcripts was altered by ovariectomy or was responsive to estradiol treatment. Nucleus accumbens transcripts differentially expressed in cycling female mice withdrawn from cocaine exhibited substantial overlap with those differentially expressed in cocaine-withdrawn male mice. A small set of transcripts were similarly affected by cocaine in the placebo- or estradiol-treated ovariectomized mice. Sex and hormonal status have profound effects on RNA expression in the nucleus accumbens of naive mice. Prolonged withdrawal from cocaine alters the expression of a much smaller number of common and sex hormone-specific transcripts.
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Affiliation(s)
- Taylor P LaRese
- Department of Neuroscience, University of Connecticut Health Center, Farmington, Connecticut
| | - Bruce A Rheaume
- Department of Neuroscience, University of Connecticut Health Center, Farmington, Connecticut
| | - Ron Abraham
- Department of Neuroscience, University of Connecticut Health Center, Farmington, Connecticut
| | - Betty A Eipper
- Department of Neuroscience, University of Connecticut Health Center, Farmington, Connecticut
| | - Richard E Mains
- Department of Neuroscience, University of Connecticut Health Center, Farmington, Connecticut
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