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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
Defining the Role of Endogenous and Pharmacological Stimulation of NtsR1 on Energy Balance

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202104806
ISBN  
9798290979809
DDC  
615
저자명  
Ramirez Virella, Jariel.
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
키워드  
Neurotensin receptor-1
기타저자  
Michigan State University Neuroscience - Doctor of Philosophy
기본자료저록  
Dissertations Abstracts International. 87-02B.
전자적 위치 및 접속  
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MARC

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■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.
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■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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