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The Origin and Factors Affecting Differentiation of Progenitor Cells in Tendon-to-Bone Integration
The Origin and Factors Affecting Differentiation of Progenitor Cells in Tendon-to-Bone Int...
The Origin and Factors Affecting Differentiation of Progenitor Cells in Tendon-to-Bone Integration

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자료유형  
 학위논문 서양
최종처리일시  
20250211151342
ISBN  
9798382834962
DDC  
610
저자명  
Kamalitdinov, Timur B.
서명/저자  
The Origin and Factors Affecting Differentiation of Progenitor Cells in Tendon-to-Bone Integration
발행사항  
[Sl] : University of Pennsylvania, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
135 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
주기사항  
Advisor: Dyment, Nathaniel A.
학위논문주기  
Thesis (Ph.D.)--University of Pennsylvania, 2024.
초록/해제  
요약Tendons and ligaments connect to bone through a highly specialized interface called the enthesis. Each component of the enthesis enables the smooth transition of forces from a relatively compliant tendon or ligament to the dense bone. However, tendon and ligament injuries frequently occur at the enthesis due to stress concentrations and current repair strategies do not result in the re-formation of the graded tissue structure, leading to high re-tear rates. There is a critical need to develop strategies to re-create the native zonal enthesis architecture. To address this need, we used insights from enthesis development to guide our studies in adults. Since traditional tendon-to-bone reattachment surgeries do not lead to enthesis re-formation, we used anterior cruciate ligament (ACL) reconstructions, which give rise to zonal attachments when tendons are passed through bone tunnels that resemble the four-zone enthesis architecture, as our test platform. We began by optimizing attachment formation in a murine ACL reconstruction (ACLR) model by investigating the effect of graft fit in the tunnel. We found that creating a press-fit of the graft against the tunnel walls promoted mineralized fibrocartilage (MFC) formation during the repair process. Next, to establish the key regulators that lead to zonal attachment formation after ACLR, we performed surgeries in SMACreERT2 mice, which labeled a mesenchymal progenitor population in the bone marrow that expanded in response to the tunnel drilling and ultimately created the attachments in the tunnels. We demonstrated that this mouse model could efficiently target cells that go on to form the attachments, allowing us to study signaling pathways that regulate attachment formation in these cells. We modulated the Hh signaling pathway, which is critical for enthesis development and maturation, in our ACLR model both genetically and pharmacologically. We found that Hh signaling played a biphasic role in promoting attachment formation after ACLR, both by increasing the early expansion of the progenitor pool that goes on to make the attachments and by increasing fibrocartilage differentiation in the later stages of healing. Together, this work establishes key mechanical and molecular factors that regulate attachment formation in the adult.
일반주제명  
Bioengineering
일반주제명  
Biology
일반주제명  
Medicine
일반주제명  
Surgery
키워드  
ACL reconstruction
키워드  
Enthesis
키워드  
Hedgehog signaling
키워드  
Tendon
키워드  
Tendon-to-bone repair
키워드  
Transgenic mice
기타저자  
University of Pennsylvania Bioengineering
기본자료저록  
Dissertations Abstracts International. 85-12B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aKamalitdinov,  Timur  B.
■24510▼aThe  Origin  and  Factors  Affecting  Differentiation  of  Progenitor  Cells  in  Tendon-to-Bone  Integration
■260    ▼a[Sl]▼bUniversity  of  Pennsylvania▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a135  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-12,  Section:  B.
■500    ▼aAdvisor:  Dyment,  Nathaniel  A.
■5021  ▼aThesis  (Ph.D.)--University  of  Pennsylvania,  2024.
■520    ▼aTendons  and  ligaments  connect  to  bone  through  a  highly  specialized  interface  called  the  enthesis.  Each  component  of  the  enthesis  enables  the  smooth  transition  of  forces  from  a  relatively  compliant  tendon  or  ligament  to  the  dense  bone.  However,  tendon  and  ligament  injuries  frequently  occur  at  the  enthesis  due  to  stress  concentrations  and  current  repair  strategies  do  not  result  in  the  re-formation  of  the  graded  tissue  structure,  leading  to  high  re-tear  rates.  There  is  a  critical  need  to  develop  strategies  to  re-create  the  native  zonal  enthesis  architecture.  To  address  this  need,  we  used  insights  from  enthesis  development  to  guide  our  studies  in  adults.  Since  traditional  tendon-to-bone  reattachment  surgeries  do  not  lead  to  enthesis  re-formation,  we  used  anterior  cruciate  ligament  (ACL)  reconstructions,  which  give  rise  to  zonal  attachments  when  tendons  are  passed  through  bone  tunnels  that  resemble  the  four-zone  enthesis  architecture,  as  our  test  platform.  We  began  by  optimizing  attachment  formation  in  a  murine  ACL  reconstruction  (ACLR)  model  by  investigating  the  effect  of  graft  fit  in  the  tunnel.  We  found  that  creating  a  press-fit  of  the  graft  against  the  tunnel  walls  promoted  mineralized  fibrocartilage  (MFC)  formation  during  the  repair  process.  Next,  to  establish  the  key  regulators  that  lead  to  zonal  attachment  formation  after  ACLR,  we  performed  surgeries  in  SMACreERT2  mice,  which  labeled  a  mesenchymal  progenitor  population  in  the  bone  marrow  that  expanded  in  response  to  the  tunnel  drilling  and  ultimately  created  the  attachments  in  the  tunnels.  We  demonstrated  that  this  mouse  model  could  efficiently  target  cells  that  go  on  to  form  the  attachments,  allowing  us  to  study  signaling  pathways  that  regulate  attachment  formation  in  these  cells.  We  modulated  the  Hh  signaling  pathway,  which  is  critical  for  enthesis  development  and  maturation,  in  our  ACLR  model  both  genetically  and  pharmacologically.  We  found  that  Hh  signaling  played  a  biphasic  role  in  promoting  attachment  formation  after  ACLR,  both  by  increasing  the  early  expansion  of  the  progenitor  pool  that  goes  on  to  make  the  attachments  and  by  increasing  fibrocartilage  differentiation  in  the  later  stages  of  healing.  Together,  this  work  establishes  key  mechanical  and  molecular  factors  that  regulate  attachment  formation  in  the  adult.
■590    ▼aSchool  code:  0175.
■650  4▼aBioengineering
■650  4▼aBiology
■650  4▼aMedicine
■650  4▼aSurgery
■653    ▼aACL  reconstruction
■653    ▼aEnthesis
■653    ▼aHedgehog  signaling
■653    ▼aTendon
■653    ▼aTendon-to-bone  repair
■653    ▼aTransgenic  mice
■690    ▼a0202
■690    ▼a0306
■690    ▼a0564
■690    ▼a0576
■71020▼aUniversity  of  Pennsylvania▼bBioengineering.
■7730  ▼tDissertations  Abstracts  International▼g85-12B.
■790    ▼a0175
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17161343▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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