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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 and Function
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105250
- ISBN
- 9798291591758
- DDC
- 615
- 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
- 기타저자
- Case Western Reserve University Pharmacology
- 기본자료저록
- Dissertations Abstracts International. 87-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202105250
■006m o d
■007cr#unu||||||||
■020 ▼a9798291591758
■035 ▼a(MiAaPQ)AAI32275986
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a615
■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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