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The Role of Regulator of G Protein Signaling 2 and 5 (RGS2 and 5) in Ventricular Structure and Function
The Role of Regulator of G Protein Signaling 2 and 5 (RGS2 and 5) in Ventricular Structure...
The Role of Regulator of G Protein Signaling 2 and 5 (RGS2 and 5) in Ventricular Structure and Function

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20260202105250
ISBN  
9798291591758
DDC  
615
저자명  
Dahlen, Shelby A.
서명/저자  
The Role of Regulator of G Protein Signaling 2 and 5 (RGS2 and 5) in Ventricular Structure and Function
발행사항  
[Sl] : Case Western Reserve University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
268 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
주기사항  
Advisor: Osei-Owusu, Patrick.
학위논문주기  
Thesis (Ph.D.)--Case Western Reserve University, 2024.
초록/해제  
요약Cardiac contractility, essential to maintaining proper cardiac output and circulation, is regulated by G protein-coupled receptor (GPCR) signaling. Previously, the absence of regulator of G protein signaling (RGS) 2 and 5, separately, was shown to cause G protein dysregulation, contributing to modest blood pressure elevation and exaggerated cardiac hypertrophic response to pressure-overload. Whether RGS2 and 5 redundantly control G protein signaling to maintain cardiovascular homeostasis is unknown. Here we examined how the dual absence of RGS2 and 5 (Rgs2/5 dbKO) affects cardiac structure and function. Rgs2/5 dbKO male mice display left ventricular dilatation and impairment at baseline as measured by echocardiography, as well as reduced contractile response to acute dobutamine infusion. Loss of RGS2 increases disorganization of the sarcomeric protein titin in isolated left ventricular cardiomyocytes (LVCM), potentially contributing to contractile impairment. Male Rgs2/5 dbKO mice are vulnerable to stress induced arrhythmias. Surgery-induced stress in male Rgs2/5 dbKO mice led to 75% mortality within 72-96 h. LVCM from Rgs2/5 dbKO male mice showed augmented Ca2+ transients and increased incidence of arrhythmia to electrical field stimulation (EFS) and activation of β-adrenergic receptors (βAR) with isoproterenol (ISO). Dual loss of RGS2 and 5 suppressed forskolin-induced cAMP production, which was restored by Gi/o inactivation with pertussis toxin which also reduced arrhythmogenesis during EFS or βAR stimulation.We hypothesized that left ventricular dilation in Rgs2/5 dbKO male mice was due to disruption of the coordinated activity of RGS2 and 5 resulting in increased sensitivity to βAR stimulation. To test this hypothesis, we challenged wild type (WT), Rgs2 KO, Rgs5 KO, and Rgs2/5 dbKO male mice with 3 days of ISO infusion. Left ventricular dilation induced by the loss of RGS2 and/or RGS5 was unaffected by ISO administration. ISO infusion induced concentric hypertrophy in WT mice (increased heart weight/tibia length (HW/TL) and cardiomyocyte cross sectional area), while in Rgs2/5 dbKO mice it increased HW/TL and induced expression of the cardiac fetal gene Nppa and proteins associated with pathologic hypertrophy. Altogether, these studies provide new insights into the role of RGS2 and RGS5 in cardiac function both at baseline and under stressful conditions.
일반주제명  
Pharmacology
일반주제명  
Physiology
일반주제명  
Molecular biology
일반주제명  
Biochemistry
키워드  
Cardiac physiology
키워드  
Regulator of G protein signaling
키워드  
G protein signaling
키워드  
G protein-coupled receptor
키워드  
β-adrenergic receptors
기타저자  
Case Western Reserve University Pharmacology
기본자료저록  
Dissertations Abstracts International. 87-03B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aDahlen,  Shelby  A.
■24510▼aThe  Role  of  Regulator  of  G  Protein  Signaling  2  and  5  (RGS2  and  5)  in  Ventricular  Structure  and  Function
■260    ▼a[Sl]▼bCase  Western  Reserve  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a268  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-03,  Section:  B.
■500    ▼aAdvisor:  Osei-Owusu,  Patrick.
■5021  ▼aThesis  (Ph.D.)--Case  Western  Reserve  University,  2024.
■520    ▼aCardiac  contractility,  essential  to  maintaining  proper  cardiac  output  and  circulation,  is  regulated  by  G  protein-coupled  receptor  (GPCR)  signaling.  Previously,  the  absence  of  regulator  of  G  protein  signaling  (RGS)  2  and  5,  separately,  was  shown  to  cause  G  protein  dysregulation,  contributing  to  modest  blood  pressure  elevation  and  exaggerated  cardiac  hypertrophic  response  to  pressure-overload.  Whether  RGS2  and  5  redundantly  control  G  protein  signaling  to  maintain  cardiovascular  homeostasis  is  unknown.  Here  we  examined  how  the  dual  absence  of  RGS2  and  5  (Rgs2/5  dbKO)  affects  cardiac  structure  and  function.  Rgs2/5  dbKO  male  mice  display  left  ventricular  dilatation  and  impairment  at  baseline  as  measured  by  echocardiography,  as  well  as  reduced  contractile  response  to  acute  dobutamine  infusion.  Loss  of  RGS2  increases  disorganization  of  the  sarcomeric  protein  titin  in  isolated  left  ventricular  cardiomyocytes  (LVCM),  potentially  contributing  to  contractile  impairment.  Male  Rgs2/5  dbKO  mice  are  vulnerable  to  stress  induced  arrhythmias.  Surgery-induced  stress  in  male  Rgs2/5  dbKO  mice  led  to  75%  mortality  within  72-96  h.  LVCM  from  Rgs2/5  dbKO  male  mice  showed  augmented  Ca2+  transients  and  increased  incidence  of  arrhythmia  to  electrical  field  stimulation  (EFS)  and  activation  of  β-adrenergic  receptors  (βAR)  with  isoproterenol  (ISO).  Dual  loss  of  RGS2  and  5  suppressed  forskolin-induced  cAMP  production,  which  was  restored  by  Gi/o  inactivation  with  pertussis  toxin  which  also  reduced  arrhythmogenesis  during  EFS  or  βAR  stimulation.We  hypothesized  that  left  ventricular  dilation  in  Rgs2/5  dbKO  male  mice  was  due  to  disruption  of  the  coordinated  activity  of  RGS2  and  5  resulting  in  increased  sensitivity  to  βAR  stimulation.  To  test  this  hypothesis,  we  challenged  wild  type  (WT),  Rgs2  KO,  Rgs5  KO,  and  Rgs2/5  dbKO  male  mice  with  3  days  of  ISO  infusion.  Left  ventricular  dilation  induced  by  the  loss  of  RGS2  and/or  RGS5  was  unaffected  by  ISO  administration.  ISO  infusion  induced  concentric  hypertrophy  in  WT  mice  (increased  heart  weight/tibia  length  (HW/TL)  and  cardiomyocyte  cross  sectional  area),  while  in  Rgs2/5  dbKO  mice  it  increased  HW/TL  and  induced  expression  of  the  cardiac  fetal  gene  Nppa  and  proteins  associated  with  pathologic  hypertrophy.  Altogether,  these  studies  provide  new  insights  into  the  role  of  RGS2  and  RGS5  in  cardiac  function  both  at  baseline  and  under  stressful  conditions.
■590    ▼aSchool  code:  0042.
■650  4▼aPharmacology
■650  4▼aPhysiology
■650  4▼aMolecular  biology
■650  4▼aBiochemistry
■653    ▼aCardiac  physiology
■653    ▼aRegulator  of  G  protein  signaling
■653    ▼aG  protein  signaling
■653    ▼aG  protein-coupled  receptor
■653    ▼aβ-adrenergic  receptors
■690    ▼a0419
■690    ▼a0487
■690    ▼a0307
■690    ▼a0719
■71020▼aCase  Western  Reserve  University▼bPharmacology.
■7730  ▼tDissertations  Abstracts  International▼g87-03B.
■790    ▼a0042
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360005▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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