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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 Integration
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211151342
- ISBN
- 9798382834962
- DDC
- 610
- 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
- Enthesis
- 키워드
- Tendon
- 키워드
- Transgenic mice
- 기타저자
- University of Pennsylvania Bioengineering
- 기본자료저록
- Dissertations Abstracts International. 85-12B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211151342
■006m o d
■007cr#unu||||||||
■020 ▼a9798382834962
■035 ▼a(MiAaPQ)AAI31242344
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a610
■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.


