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Defining the Role of Endogenous and Pharmacological Stimulation of NtsR1 on Energy Balance
Defining the Role of Endogenous and Pharmacological Stimulation of NtsR1 on Energy Balance
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104806
- ISBN
- 9798290979809
- DDC
- 615
- 서명/저자
- Defining the Role of Endogenous and Pharmacological Stimulation of NtsR1 on Energy Balance
- 발행사항
- [Sl] : Michigan State University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 141 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-02, Section: B.
- 주기사항
- Advisor: Leinninger, Gina M.
- 학위논문주기
- Thesis (Ph.D.)--Michigan State University, 2025.
- 초록/해제
- 요약Obesity results from an imbalance between excessive food intake and insufficient physical activity and energy expenditure. Yet, an incomplete understanding of how the brain modifies feeding and physical activity has hindered the development of pharmacological strategies to support weight loss. The neurotensin (Nts) system is a promising therapeutic target that may be leveraged to promote weight loss in obesity, particularly through the activation of the G-protein-coupled receptor neurotensin receptor-1 (NtsR1). However, it is necessary to determine whether the endogenous systems are sufficient to activate NtsR1 for weight loss and identify which signals from NtsR1 promote anorectic behaviors. The ventral tegmental area (VTA) is well known for containing a large portion of dopamine neurons, most of which express NtsR1 and have been implicated in ingestive behaviors and weight modulation. Subsequently, the central hypothesis of this work is that endogenous and pharmacological stimulation of VTANtsR1 will promote weight-loss behaviors. To further determine whether NtsR1 β-arrestin signals are responsible for weight loss, we used wild-type mice to deliver systemic or central SBI-553, a β-arrestin-positive allosteric and G-protein-negative allosteric modulator, and assessed ingestive behavior and metabolic assays. We found that SBI-553 did not affect ingestive behaviors or body weight. By tapping into the lateral hypothalamus (LHA), a brain region rich in Nts, we applied optogenetics in NtsCre to activate the subset of LHANts neurons or their VTA projections. A pharmacological blocker for NtsR1 was administered to determine whether the effects observed were attributable to this Nts-NtsR1 circuit. We found that activating the LHANts-VTANtsR1 circuit can promote locomotion, one of the weight-losing behaviors. Intriguingly, we observed that optogenetic activation of all LHANts neurons or their VTA projections promote physical activity, even in obesity, but had no effects on ingestive behaviors or body weight. Intriguingly, our data also indicates that obesity changes the Nts system via Nts-NtsR1 signal disruption. Altogether, this data supports targeting the NtsR1 in the VTA for weight-loss and will guide the development of therapies to manage obesity.
- 일반주제명
- Pharmacology
- 일반주제명
- Neurosciences
- 일반주제명
- Molecular biology
- 일반주제명
- Biochemistry
- 일반주제명
- Genetics
- 키워드
- Locomotion
- 키워드
- Neurotensin
- 키워드
- Obesity
- 키워드
- Optogenetics
- 키워드
- Weight loss
- 기타저자
- Michigan State University Neuroscience - Doctor of Philosophy
- 기본자료저록
- Dissertations Abstracts International. 87-02B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202104806
■006m o d
■007cr#unu||||||||
■020 ▼a9798290979809
■035 ▼a(MiAaPQ)AAI32165790
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a615
■1001 ▼aRamirez Virella, Jariel.▼0(orcid)0000-0003-1391-1869
■24510▼aDefining the Role of Endogenous and Pharmacological Stimulation of NtsR1 on Energy Balance
■260 ▼a[Sl]▼bMichigan State University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a141 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-02, Section: B.
■500 ▼aAdvisor: Leinninger, Gina M.
■5021 ▼aThesis (Ph.D.)--Michigan State University, 2025.
■520 ▼aObesity results from an imbalance between excessive food intake and insufficient physical activity and energy expenditure. Yet, an incomplete understanding of how the brain modifies feeding and physical activity has hindered the development of pharmacological strategies to support weight loss. The neurotensin (Nts) system is a promising therapeutic target that may be leveraged to promote weight loss in obesity, particularly through the activation of the G-protein-coupled receptor neurotensin receptor-1 (NtsR1). However, it is necessary to determine whether the endogenous systems are sufficient to activate NtsR1 for weight loss and identify which signals from NtsR1 promote anorectic behaviors. The ventral tegmental area (VTA) is well known for containing a large portion of dopamine neurons, most of which express NtsR1 and have been implicated in ingestive behaviors and weight modulation. Subsequently, the central hypothesis of this work is that endogenous and pharmacological stimulation of VTANtsR1 will promote weight-loss behaviors. To further determine whether NtsR1 β-arrestin signals are responsible for weight loss, we used wild-type mice to deliver systemic or central SBI-553, a β-arrestin-positive allosteric and G-protein-negative allosteric modulator, and assessed ingestive behavior and metabolic assays. We found that SBI-553 did not affect ingestive behaviors or body weight. By tapping into the lateral hypothalamus (LHA), a brain region rich in Nts, we applied optogenetics in NtsCre to activate the subset of LHANts neurons or their VTA projections. A pharmacological blocker for NtsR1 was administered to determine whether the effects observed were attributable to this Nts-NtsR1 circuit. We found that activating the LHANts-VTANtsR1 circuit can promote locomotion, one of the weight-losing behaviors. Intriguingly, we observed that optogenetic activation of all LHANts neurons or their VTA projections promote physical activity, even in obesity, but had no effects on ingestive behaviors or body weight. Intriguingly, our data also indicates that obesity changes the Nts system via Nts-NtsR1 signal disruption. Altogether, this data supports targeting the NtsR1 in the VTA for weight-loss and will guide the development of therapies to manage obesity.
■590 ▼aSchool code: 0128.
■650 4▼aPharmacology
■650 4▼aNeurosciences
■650 4▼aMolecular biology
■650 4▼aBiochemistry
■650 4▼aGenetics
■653 ▼aLocomotion
■653 ▼aNeurotensin
■653 ▼aObesity
■653 ▼aOptogenetics
■653 ▼aWeight loss
■653 ▼aNeurotensin receptor-1
■690 ▼a0419
■690 ▼a0317
■690 ▼a0487
■690 ▼a0369
■690 ▼a0307
■71020▼aMichigan State University▼bNeuroscience - Doctor of Philosophy.
■7730 ▼tDissertations Abstracts International▼g87-02B.
■790 ▼a0128
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358894▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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