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Engineering Poly(Ethylene Glycol) Hydrogels to Facilitate Ovarian Tissue Transplantation
Engineering Poly(Ethylene Glycol) Hydrogels to Facilitate Ovarian Tissue Transplantation
Engineering Poly(Ethylene Glycol) Hydrogels to Facilitate Ovarian Tissue Transplantation

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202103639
ISBN  
9798314873298
DDC  
610
저자명  
Rionda, Monica Anne Wall.
서명/저자  
Engineering Poly(Ethylene Glycol) Hydrogels to Facilitate Ovarian Tissue Transplantation
발행사항  
[Sl] : University of Michigan, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
123 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-11, Section: B.
주기사항  
Advisor: Shikanov, Ariella.
학위논문주기  
Thesis (Ph.D.)--University of Michigan, 2025.
초록/해제  
요약Primary ovarian insufficiency (POI), the premature loss of ovarian function, is a prevalent side effect of common life-saving anti-cancer therapies. POI patients face infertility and insufficient production of ovarian hormones. The premature loss of ovarian hormones places patients at increased risk for a myriad of comorbidities, which, alongside the psychosocial impact of infertility, can significantly impact their quality of life. As cancer survivorship continues to increase, developing treatments that minimize the long-term impact of side effects like POI becomes increasingly important. Currently, separate treatments are required to restore fertility and ovarian hormones. Hormone restoration is achieved through hormone replacement therapy (HRT), and infertility is addressed using assistive reproductive technologies like ovarian stimulation followed by cryopreservation of the retrieved eggs or fertilized embryos. Although effective, these approaches have key limitations. HRT delivers only a fraction of the hormones produced by the native ovary and does not recapitulate the cyclic hormone production seen in vivo. Oocyte retrieval is unfeasible for prepubertal patients as they cannot produce mature oocytes even after ovarian stimulation. This dissertation explores approaches to employ ovarian tissue transplantation (OTT) as an alternative POI treatment capable of restoring fertility and dynamically delivering the complete milieu of ovarian hormones. Patients unable to preserve their ovarian tissue before gonadotoxic treatments would rely on allogenic OTT. This approach is still experimental and lacks exploration of the factors governing endocrine function and immune rejection of ovarian allografts. We investigated the impact of donor age on ovarian allograft function and survival by implanting allogeneic ovarian tissue from pre- and peripubertal mice into ovariectomized recipients. We observed a strong correlation between restoration of ovarian endocrine function and the size of the implanted follicular reserve, consistent with clinical observations. Allospecific antibody production was first observed 10-12 days after transplantation, consistent with the timeline of graft revascularization. Peripubertal transplants elicited higher avidity antibodies than prepubertal, suggesting aging ovaries may be more immunogenic. This work deepens our understanding of the relationship between donor age and allogenic OTT outcomes and can help inform allowable criteria for future ovarian tissue donors. Ovarian tissue cryopreservation and autotransplantation (OTCT) is the most established mode of OTT and only biological fertility preservation option for prepubertal cancer patients with ovaries. Unfortunately, this approach remains contraindicated for up to 40% of prepubertal cancer patients due to the risk of transplanting malignant cells. Transplantation of isolated follicles may significantly reduce the risk of cancer recurrence, while restoring complete ovarian function. However, this approach is challenging because isolated follicles require a supportive scaffold to survive and develop. We report a synthetic, proteolytically degradable poly(ethylene glycol) (PEG) hydrogel that supports the development and hormone production of isolated, human ovarian follicles in vivo. Early-stage, human ovarian follicles encapsulated in biomimetic PEG hydrogels developed to preantral stages over 20 weeks in vivo. Developing follicles produced estradiol and restored estrous activity in ovariectomized mice. This work is the first to leverage a fully synthetic scaffold to support isolated human ovarian follicles and longitudinally monitor restoration of ovarian endocrine function in a mouse model. This work further substantiates OTT as a novel treatment to restore ovarian endocrine function and fertility. Our results corroborate the correlation between ovarian reserve and graft function, broaden our understanding of ovarian allograft rejection, and demonstrate folliculogenesis and hormone production from isolated human ovarian follicles in a synthetic matrix.
일반주제명  
Biomedical engineering
일반주제명  
Medicine
일반주제명  
Biochemistry
키워드  
Tissue engineering
키워드  
Primary ovarian engineering
키워드  
Ovarian transplantation
키워드  
Ovarian endocrine function
키워드  
Hormone replacement therapy
기타저자  
University of Michigan Biomedical Engineering
기본자료저록  
Dissertations Abstracts International. 86-11B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aRionda,  Monica  Anne  Wall.
■24510▼aEngineering  Poly(Ethylene  Glycol)  Hydrogels  to  Facilitate  Ovarian  Tissue  Transplantation
■260    ▼a[Sl]▼bUniversity  of  Michigan▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a123  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-11,  Section:  B.
■500    ▼aAdvisor:  Shikanov,  Ariella.
■5021  ▼aThesis  (Ph.D.)--University  of  Michigan,  2025.
■520    ▼aPrimary  ovarian  insufficiency  (POI),  the  premature  loss  of  ovarian  function,  is  a  prevalent  side  effect  of  common  life-saving  anti-cancer  therapies.  POI  patients  face  infertility  and  insufficient  production  of  ovarian  hormones.  The  premature  loss  of  ovarian  hormones  places  patients  at  increased  risk  for  a  myriad  of  comorbidities,  which,  alongside  the  psychosocial  impact  of  infertility,  can  significantly  impact  their  quality  of  life.  As  cancer  survivorship  continues  to  increase,  developing  treatments  that  minimize  the  long-term  impact  of  side  effects  like  POI  becomes  increasingly  important.    Currently,  separate  treatments  are  required  to  restore  fertility  and  ovarian  hormones.  Hormone  restoration  is  achieved  through  hormone  replacement  therapy  (HRT),  and  infertility  is  addressed  using  assistive  reproductive  technologies  like  ovarian  stimulation  followed  by  cryopreservation  of  the  retrieved  eggs  or  fertilized  embryos.  Although  effective,  these  approaches  have  key  limitations.  HRT  delivers  only  a  fraction  of  the  hormones  produced  by  the  native  ovary  and  does  not  recapitulate  the  cyclic  hormone  production  seen  in  vivo.  Oocyte  retrieval  is  unfeasible  for  prepubertal  patients  as  they  cannot  produce  mature  oocytes  even  after  ovarian  stimulation.  This  dissertation  explores  approaches  to  employ  ovarian  tissue  transplantation  (OTT)  as  an  alternative  POI  treatment  capable  of  restoring  fertility  and  dynamically  delivering  the  complete  milieu  of  ovarian  hormones.  Patients  unable  to  preserve  their  ovarian  tissue  before  gonadotoxic  treatments  would  rely  on  allogenic  OTT.  This  approach  is  still  experimental  and  lacks  exploration  of  the  factors  governing  endocrine  function  and  immune  rejection  of  ovarian  allografts.  We  investigated  the  impact  of  donor  age  on  ovarian  allograft  function  and  survival  by  implanting  allogeneic  ovarian  tissue  from  pre-  and  peripubertal  mice  into  ovariectomized  recipients.  We  observed  a  strong  correlation  between  restoration  of  ovarian  endocrine  function  and  the  size  of  the  implanted  follicular  reserve,  consistent  with  clinical  observations.  Allospecific  antibody  production  was  first  observed  10-12  days  after  transplantation,  consistent  with  the  timeline  of  graft  revascularization.  Peripubertal  transplants  elicited  higher  avidity  antibodies  than  prepubertal,  suggesting  aging  ovaries  may  be  more  immunogenic.  This  work  deepens  our  understanding  of  the  relationship  between  donor  age  and  allogenic  OTT  outcomes  and  can  help  inform  allowable  criteria  for  future  ovarian  tissue  donors.  Ovarian  tissue  cryopreservation  and  autotransplantation  (OTCT)  is  the  most  established  mode  of  OTT  and  only  biological  fertility  preservation  option  for  prepubertal  cancer  patients  with  ovaries.  Unfortunately,  this  approach  remains  contraindicated  for  up  to  40%  of  prepubertal  cancer  patients  due  to  the  risk  of  transplanting  malignant  cells.  Transplantation  of  isolated  follicles  may  significantly  reduce  the  risk  of  cancer  recurrence,  while  restoring  complete  ovarian  function.  However,  this  approach  is  challenging  because  isolated  follicles  require  a  supportive  scaffold  to  survive  and  develop.  We  report  a  synthetic,  proteolytically  degradable  poly(ethylene  glycol)  (PEG)  hydrogel  that  supports  the  development  and  hormone  production  of  isolated,  human  ovarian  follicles  in  vivo.  Early-stage,  human  ovarian  follicles  encapsulated  in  biomimetic  PEG  hydrogels  developed  to  preantral  stages  over  20  weeks  in  vivo.  Developing  follicles  produced  estradiol  and  restored  estrous  activity  in  ovariectomized  mice.  This  work  is  the  first  to  leverage  a  fully  synthetic  scaffold  to  support  isolated  human  ovarian  follicles  and  longitudinally  monitor  restoration  of  ovarian  endocrine  function  in  a  mouse  model.  This  work  further  substantiates  OTT  as  a  novel  treatment  to  restore  ovarian  endocrine  function  and  fertility.  Our  results  corroborate  the  correlation  between  ovarian  reserve  and  graft  function,  broaden  our  understanding  of  ovarian  allograft  rejection,  and  demonstrate  folliculogenesis  and  hormone  production  from  isolated  human  ovarian  follicles  in  a  synthetic  matrix.
■590    ▼aSchool  code:  0127.
■650  4▼aBiomedical  engineering
■650  4▼aMedicine
■650  4▼aBiochemistry
■653    ▼aTissue  engineering
■653    ▼aPrimary  ovarian  engineering
■653    ▼aOvarian  transplantation
■653    ▼aOvarian  endocrine  function
■653    ▼aHormone  replacement  therapy
■690    ▼a0541
■690    ▼a0564
■690    ▼a0487
■71020▼aUniversity  of  Michigan▼bBiomedical  Engineering.
■7730  ▼tDissertations  Abstracts  International▼g86-11B.
■790    ▼a0127
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358066▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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