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The Role of Gonadal Hormones on Female Extinction Learning
The Role of Gonadal Hormones on Female Extinction Learning  / Adriana Vasquez
The Role of Gonadal Hormones on Female Extinction Learning

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260311091532.5
ISBN  
9798270231361
DDC  
613.94
저자명  
Vasquez, Adriana
서명/저자  
The Role of Gonadal Hormones on Female Extinction Learning / Adriana Vasquez
발행사항  
[Sl] : The University of Texas at Austin, 2025
형태사항  
1 electronic resource (199 pages)
주기사항  
Source: Dissertations Abstracts International, Volume: 87-06, Section: A.
주기사항  
Advisors: Lee, Hongjoo J. Committee members: Serafine, Katherine M.; Orsini, Caitlin A.; Monfils, Marie-H.
학위논문주기  
- Ph.D. : The University of Texas at Austin, 2025.
초록/해제  
요약Prevailing evidence suggests that women have increased vulnerability for developing substance use disorders (SUD), as compared to men. A wide variety of psychological and environmental factors may influence this sex difference in humans, but similar sex differences are observed in animal models, suggesting a role for biological mechanisms. This results, at least in part, from fluctuating levels of gonadal hormones, such as estradiol (E2) and progesterone (P4), during the menstrual cycle. Rat models of SUD allow us to directly examine the effects of gonadal hormones on behaviors resulting from substance use and show that females display increased behavioral effects to drugs and show higher rates of relapse-like behaviors, as compared to males. A type of treatment for SUD is exposure therapy, which is in part based on extinction, and involves the repeated presentation of a previously learned conditioned stimulus, without subsequent drug intake/administration. Over time, the conditioned response decreases, resulting in "extinction"; yet some individuals still relapse, even after undergoing successful extinction. For females, gonadal hormones may play a role in relapse-like behavior after extinction. Moreover, extinction-based therapies overlook the use of hormonal contraceptives (HCs), which are known to affect the manner and rate of release of E2 and P4, suggesting an important role for HCs in SUD treatments. Previous work investigated the role of HCs on AMPH preference and showed that chronic levonorgestrel (LNG; synthetic progestin) administration, via subdermal LNG implant, led to decreased AMPH preference over the course of extinction. Additional work suggests that hormonal status during extinction and reinstatement influence stimulant-induced responses at reinstatement, but whether the timing of HC administration also influences the response to AMPH is unknown. One caveat, however, is that most models of HC in rodents involve the use of methods that do not reflect the majority of HC use in women (i.e., oral contraception). To address this, a model of oral HC administration was developed by mixing LNG into a vanilla cookie paste that allowed rats to readily consume LNG, without added stress. Then, rats underwent AMPH conditioning and tested for their AMPH-preference over the course of extinction sessions, when oral LNG was administered at three doses (250μg, 500μg, or 2mg). Results showed that LNG at 500μg and 2mg doses decreased AMPH-preference over the course of extinction sessions. Additionally, these doses impacted gonadal function as observed with physiological characteristics of other HC models (e.g., suppression of ovulation via decreased luteinizing hormone, E2 and P4, and decreased uterine horn width). Next, using the same model of oral HC, I tested the timing effects of oral LNG administration on AMPH preference during extinction and/or reinstatement test. LNG's effects on reward and extinction related neural circuits were also investigated after a challenge dose of AMPH during reinstatement. First, I replicated my previous work and showed that LNG during extinction decreased AMPH preference. Further, females that received LNG during extinction, but not during reinstatement, showed AMPH-induced reinstatement. Conversely, females that received LNG during extinction and reinstatement did not show this response, suggesting the importance of HC adherence to prevent relapse. Additionally, neural activity was impacted differently between females that received LNG during extinction versus those that received it during reinstatement. My work highlights the importance of gonadal hormone manipulation and propose a role of HCs in extinction-based treatments to provide targeted treatment for women suffering from SUD.
언어주기  
English
일반주제명  
Pharmacology
일반주제명  
Neurosciences
일반주제명  
Biology
일반주제명  
Womens studies
키워드  
Substance use disorders
키워드  
Menstrual cycle
키워드  
Gonadal hormones
키워드  
Hormonal contraceptives
기타저자  
The University of Texas at Austin Psychology
기본자료저록  
Dissertations Abstracts International. 87-06A.
전자적 위치 및 접속  
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MARC

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■1001  ▼aVasquez,  Adriana▼eauthor.
■24510▼aThe  Role  of  Gonadal  Hormones  on  Female  Extinction  Learning  ▼cAdriana  Vasquez
■260    ▼a[Sl]▼bThe  University  of  Texas  at  Austin▼c2025
■264  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a1  electronic  resource  (199  pages)
■336    ▼atext▼btxt▼2rdacontent
■337    ▼acomputer▼bc▼2rdamedia
■338    ▼aonline  resource▼bcr▼2rdacarrier
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-06,  Section:  A.
■500    ▼aAdvisors:  Lee,  Hongjoo  J.    Committee  members:  Serafine,  Katherine  M.;  Orsini,  Caitlin  A.;  Monfils,  Marie-H.
■5021  ▼bPh.D.▼cThe  University  of  Texas  at  Austin▼d2025.
■520    ▼aPrevailing  evidence  suggests  that  women  have  increased  vulnerability  for  developing  substance  use  disorders  (SUD),  as  compared  to  men.  A  wide  variety  of  psychological  and  environmental  factors  may  influence  this  sex  difference  in  humans,  but  similar  sex  differences  are  observed  in  animal  models,  suggesting  a  role  for  biological  mechanisms.  This  results,  at  least  in  part,  from  fluctuating  levels  of  gonadal  hormones,  such  as  estradiol  (E2)  and  progesterone  (P4),  during  the  menstrual  cycle.  Rat  models  of  SUD  allow  us  to  directly  examine  the  effects  of  gonadal  hormones  on  behaviors  resulting  from  substance  use  and  show  that  females  display  increased  behavioral  effects  to  drugs  and  show  higher  rates  of  relapse-like  behaviors,  as  compared  to  males.  A  type  of  treatment  for  SUD  is  exposure  therapy,  which  is  in  part  based  on  extinction,  and  involves  the  repeated  presentation  of  a  previously  learned  conditioned  stimulus,  without  subsequent  drug  intake/administration.  Over  time,  the  conditioned  response  decreases,  resulting  in  "extinction";  yet  some  individuals  still  relapse,  even  after  undergoing  successful  extinction.  For  females,  gonadal  hormones  may  play  a  role  in  relapse-like  behavior  after  extinction.  Moreover,  extinction-based  therapies  overlook  the  use  of  hormonal  contraceptives  (HCs),  which  are  known  to  affect  the  manner  and  rate  of  release  of  E2  and  P4,  suggesting  an  important  role  for  HCs  in  SUD  treatments.  Previous  work  investigated  the  role  of  HCs  on  AMPH  preference  and  showed  that  chronic  levonorgestrel  (LNG;  synthetic  progestin)  administration,  via  subdermal  LNG  implant,  led  to  decreased  AMPH  preference  over  the  course  of  extinction.  Additional  work  suggests  that  hormonal  status  during  extinction  and  reinstatement  influence  stimulant-induced  responses  at  reinstatement,  but  whether  the  timing  of  HC  administration  also  influences  the  response  to  AMPH  is  unknown.  One  caveat,  however,  is  that  most  models  of  HC  in  rodents  involve  the  use  of  methods  that  do  not  reflect  the  majority  of  HC  use  in  women  (i.e.,  oral  contraception).  To  address  this,  a  model  of  oral  HC  administration  was  developed  by  mixing  LNG  into  a  vanilla  cookie  paste  that  allowed  rats  to  readily  consume  LNG,  without  added  stress.  Then,  rats  underwent  AMPH  conditioning  and  tested  for  their  AMPH-preference  over  the  course  of  extinction  sessions,  when  oral  LNG  was  administered  at  three  doses  (250μg,  500μg,  or  2mg).  Results  showed  that  LNG  at  500μg  and  2mg  doses  decreased  AMPH-preference  over  the  course  of  extinction  sessions.  Additionally,  these  doses  impacted  gonadal  function  as  observed  with  physiological  characteristics  of  other  HC  models  (e.g.,  suppression  of  ovulation  via  decreased  luteinizing  hormone,  E2  and  P4,  and  decreased  uterine  horn  width).  Next,  using  the  same  model  of  oral  HC,  I  tested  the  timing  effects  of  oral  LNG  administration  on  AMPH  preference  during  extinction  and/or  reinstatement  test.  LNG's  effects  on  reward  and  extinction  related  neural  circuits  were  also  investigated  after  a  challenge  dose  of  AMPH  during  reinstatement.  First,  I  replicated  my  previous  work  and  showed  that  LNG  during  extinction  decreased  AMPH  preference.  Further,  females  that  received  LNG  during  extinction,  but  not  during  reinstatement,  showed  AMPH-induced  reinstatement.  Conversely,  females  that  received  LNG  during  extinction  and  reinstatement  did  not  show  this  response,  suggesting  the  importance  of  HC  adherence  to  prevent  relapse.  Additionally,  neural  activity  was  impacted  differently  between  females  that  received  LNG  during  extinction  versus  those  that  received  it  during  reinstatement.  My  work  highlights  the  importance  of  gonadal  hormone  manipulation  and  propose  a  role  of  HCs  in  extinction-based  treatments  to  provide  targeted  treatment  for  women  suffering  from  SUD.
■546    ▼aEnglish
■590    ▼aSchool  code:  0227
■650  4▼aPharmacology
■650  4▼aNeurosciences
■650  4▼aBiology
■650  4▼aWomens  studies
■653    ▼aSubstance  use  disorders
■653    ▼aMenstrual  cycle
■653    ▼aGonadal  hormones
■653    ▼aHormonal  contraceptives
■7102  ▼aThe  University  of  Texas  at  Austin▼bPsychology.▼edegree  granting  institution.
■7201  ▼aLee,  Hongjoo  J.▼edegree  supervisor.
■7730  ▼tDissertations  Abstracts  International▼g87-06A.
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17361193▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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