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Engineering the Immune Response to Improve Muscle Regeneration
Engineering the Immune Response to Improve Muscle Regeneration
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105216
- ISBN
- 9798291565629
- DDC
- 610
- 서명/저자
- Engineering the Immune Response to Improve Muscle Regeneration
- 발행사항
- [Sl] : University of Michigan, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 134 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
- 주기사항
- Advisor: Aguilar, Carlos Andres.
- 학위논문주기
- Thesis (Ph.D.)--University of Michigan, 2025.
- 초록/해제
- 요약The traumatic or surgical loss of a critical mass of skeletal muscle, or volumetric muscle loss (VML), is responsible for greater than 90% of muscle conditions that lead to long-term disability. VML injured tissue typically results in supplantation of muscle with fibrotic scarring and decreased muscle function. The fibrotic scarring induced from VML injury is the result of a dysregulated immune response, but the cellular and molecular drivers that recruit and program different immune cells after VML remain understudied. Moreover, how this sequela overwhelms the regenerative capacity of muscle resulting in aberrant muscle regeneration is unknown. This dissertation characterizes two approaches to alleviate the dysregulated immune response that develops after VML injuries and builds new insights into the VML etiology. In our first aim, we use metabolomics to profile how a new class of bioactive factors including eicosanoids and specialized pro-resolving mediators respond to VML injuries that heal or exacerbate fibrosis. We first administered regenerative and degenerative VML injuries in murine models and characterized fibrosis, immune cell infiltration, and muscle function. Degenerative VML injuries showed increased fibrosis, higher immune cell infiltration, and reduced muscle function. Lipidomic profiling revealed a higher proportion of pro-inflammatory eicosanoids compared to pro-resolving mediators for degenerative VML injuries. Repletion of Maresin 1, a pro-resolving lipid mediator into degenerative VML injuries reduced fibrosis, immune cell infiltration and partially ameliorated the loss of muscle function. To understand mechanisms of action from Maresin 1 on muscle stem cells and muscle regeneration, we quantified receptor changes in different muscle stem cell states and detected that Maresin 1 induces proliferation via cyclic AMP and not through the canonical WNT pathway. Finally, we utilized single cell transcriptomics to understand how other cell types respond to Maresin 1 treatment after VML. Maresin 1 treatment reduced expression of inflammatory signaling and genes associated with fibrosis in macrophages and neutrophils while increasing expression of genes associated with myogenesis in muscle stem cells and myoblasts. These findings demonstrate how targeting pro-resolving lipid mediators can alter cell dynamics towards muscle regeneration. The second aim focused on the use of synthetic protein nanoparticles (SPNPs) to manipulate the activation of myeloid cells recruited in VML injuries. We first analyzed the monocyte and macrophage response of degenerative and regenerative VML injuries and observed increased numbers of total immune cells, pro-inflammatory monocytes and macrophages and scar-associated macrophages for degenerative VML injuries. In vivo delivery of the AMPK agonist AICAR reduced neutrophils and macrophages post-injury. Since AICAR possesses poor bioavailability, SPNPs containing AICAR were created, characterized and delivered into degenerative VML defects. Flow cytometric analysis showed strong SPNPs uptake by immune cells after injury and minimal trafficking to other sites in the body. We profiled the responses of single cells after VML injury and treatment with AICAR or blank SPNPs with single-cell RNA sequencing. We found increased macrophage phagocytosis gene expression signatures and decreases in pro-inflammatory signaling when compared to blank nanoparticle treatment and validated these results with flow cytometry. These results establish a paradigm through which immune dysfunction can be targeted and controlled after VML. This dissertation expands our knowledge of the pathological immune response after VML, and how different immunomodulation strategies impact these circuits. This understanding can facilitate the development of new therapeutic modalities as well as improve existing therapies to promote recovery of neuromuscular strength.
- 일반주제명
- Biomedical engineering
- 일반주제명
- Biology
- 일반주제명
- Molecular biology
- 일반주제명
- Immunology
- 키워드
- Skeletal muscle
- 키워드
- Regeneration
- 기타저자
- University of Michigan Biomedical Engineering
- 기본자료저록
- Dissertations Abstracts International. 87-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798291565629
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■035 ▼a(MiAaPQ)umichrackham006334
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a610
■1001 ▼aCastor-Macias, Jesus Alonso.
■24510▼aEngineering the Immune Response to Improve Muscle Regeneration
■260 ▼a[Sl]▼bUniversity of Michigan▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a134 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-03, Section: B.
■500 ▼aAdvisor: Aguilar, Carlos Andres.
■5021 ▼aThesis (Ph.D.)--University of Michigan, 2025.
■520 ▼aThe traumatic or surgical loss of a critical mass of skeletal muscle, or volumetric muscle loss (VML), is responsible for greater than 90% of muscle conditions that lead to long-term disability. VML injured tissue typically results in supplantation of muscle with fibrotic scarring and decreased muscle function. The fibrotic scarring induced from VML injury is the result of a dysregulated immune response, but the cellular and molecular drivers that recruit and program different immune cells after VML remain understudied. Moreover, how this sequela overwhelms the regenerative capacity of muscle resulting in aberrant muscle regeneration is unknown. This dissertation characterizes two approaches to alleviate the dysregulated immune response that develops after VML injuries and builds new insights into the VML etiology. In our first aim, we use metabolomics to profile how a new class of bioactive factors including eicosanoids and specialized pro-resolving mediators respond to VML injuries that heal or exacerbate fibrosis. We first administered regenerative and degenerative VML injuries in murine models and characterized fibrosis, immune cell infiltration, and muscle function. Degenerative VML injuries showed increased fibrosis, higher immune cell infiltration, and reduced muscle function. Lipidomic profiling revealed a higher proportion of pro-inflammatory eicosanoids compared to pro-resolving mediators for degenerative VML injuries. Repletion of Maresin 1, a pro-resolving lipid mediator into degenerative VML injuries reduced fibrosis, immune cell infiltration and partially ameliorated the loss of muscle function. To understand mechanisms of action from Maresin 1 on muscle stem cells and muscle regeneration, we quantified receptor changes in different muscle stem cell states and detected that Maresin 1 induces proliferation via cyclic AMP and not through the canonical WNT pathway. Finally, we utilized single cell transcriptomics to understand how other cell types respond to Maresin 1 treatment after VML. Maresin 1 treatment reduced expression of inflammatory signaling and genes associated with fibrosis in macrophages and neutrophils while increasing expression of genes associated with myogenesis in muscle stem cells and myoblasts. These findings demonstrate how targeting pro-resolving lipid mediators can alter cell dynamics towards muscle regeneration. The second aim focused on the use of synthetic protein nanoparticles (SPNPs) to manipulate the activation of myeloid cells recruited in VML injuries. We first analyzed the monocyte and macrophage response of degenerative and regenerative VML injuries and observed increased numbers of total immune cells, pro-inflammatory monocytes and macrophages and scar-associated macrophages for degenerative VML injuries. In vivo delivery of the AMPK agonist AICAR reduced neutrophils and macrophages post-injury. Since AICAR possesses poor bioavailability, SPNPs containing AICAR were created, characterized and delivered into degenerative VML defects. Flow cytometric analysis showed strong SPNPs uptake by immune cells after injury and minimal trafficking to other sites in the body. We profiled the responses of single cells after VML injury and treatment with AICAR or blank SPNPs with single-cell RNA sequencing. We found increased macrophage phagocytosis gene expression signatures and decreases in pro-inflammatory signaling when compared to blank nanoparticle treatment and validated these results with flow cytometry. These results establish a paradigm through which immune dysfunction can be targeted and controlled after VML. This dissertation expands our knowledge of the pathological immune response after VML, and how different immunomodulation strategies impact these circuits. This understanding can facilitate the development of new therapeutic modalities as well as improve existing therapies to promote recovery of neuromuscular strength.
■590 ▼aSchool code: 0127.
■650 4▼aBiomedical engineering
■650 4▼aBiology
■650 4▼aMolecular biology
■650 4▼aImmunology
■653 ▼aVolumetric muscle loss
■653 ▼aSkeletal muscle
■653 ▼aTraumatic injuries
■653 ▼aRegeneration
■690 ▼a0541
■690 ▼a0307
■690 ▼a0306
■690 ▼a0982
■71020▼aUniversity of Michigan▼bBiomedical Engineering.
■7730 ▼tDissertations Abstracts International▼g87-03B.
■790 ▼a0127
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359798▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


