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αB-Crystallin Phosphorylation Induces a Condensatopathy to Worsen Post-Myocardial Infarction Cardiomyopathy.
αB-Crystallin Phosphorylation Induces a Condensatopathy to Worsen Post-Myocardial Infarction Cardiomyopathy.
상세정보
- 자료유형
- 학위논문
- Control Number
- 0017161729
- International Standard Book Number
- 9798382542355
- Dewey Decimal Classification Number
- 574
- Main Entry-Personal Name
- Islam, Md. Moydul.
- Publication, Distribution, etc. (Imprint
- [S.l.] : Washington University in St. Louis., 2024
- Publication, Distribution, etc. (Imprint
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- Physical Description
- 158 p.
- General Note
- Source: Dissertations Abstracts International, Volume: 85-11, Section: B.
- General Note
- Advisor: Moeller, Kevin.
- Dissertation Note
- Thesis (Ph.D.)--Washington University in St. Louis, 2024.
- Summary, Etc.
- 요약Rare genetic mutations in proteins expressed in cardiomyocytes lead to proteotoxic cardiomyopathies which are characterized by widespread protein-aggregate pathology. However, the mechanistic link between proteotoxicity and protein-aggregates in the more common ischemic cardiomyopathy remains unclear. Our study revealed the mis-localization of desmin, actin, and α-actinin to protein-aggregates in the myocardium of patients with ischemic cardiomyopathy and in mice hearts undergoing post-myocardial infarction ventricular remodeling. These findings mimic observations in autosomal-dominant cardiomyopathy resulting from the R120G mutation in the chaperone protein CRYAB where desmin is mis-localized into the aggregates. Importantly, we observed increased phosphorylation of CRYAB at serine-59 (pS59CRYAB) and its accumulation in the NP40-insoluble aggregate-rich fraction. Further investigation showed that CRYAB undergoes phase separation, and mimicking phosphorylation at serine-59 with an aspartate substitution reduced the fluidity of CRYAB condensates, promoting protein-aggregate formation and increased cell death. Conversely, substituting serine-59 with alanine, by preventing phosphorylation, restored the fluidity of CRYAB condensates and reduced protein aggregation. Moreover, introducing a phosphodeficient S59A mutation, but not the phospho-mimetic S59D mutation, at the CRYAB locus in mice rescued adverse left ventricular remodeling after ischemia reperfusion injury. Treatment with 25-Hydroxycholesterol attenuated serine-59 phosphorylation, increasing the fluidity of R120G-CRYAB condensates, and ameliorating post-myocardial infarction cardiac dysfunction. Experimental interventions aimed at preventing aggregate formation or promoting disaggregation exacerbated post-myocardial infarction cardiomyopathy, highlighting the importance of pS59CRYAB sequestration in aggregates to attenuate disease progression. These findings suggest that modulating CRYAB phase separation could offer a promising approach to mitigating ischemic cardiomyopathy.
- Subject Added Entry-Topical Term
- Biochemistry.
- Subject Added Entry-Topical Term
- Cellular biology.
- Subject Added Entry-Topical Term
- Genetics.
- Index Term-Uncontrolled
- Condensatopathy
- Index Term-Uncontrolled
- Cardiomyopathy
- Index Term-Uncontrolled
- Protein aggregates
- Index Term-Uncontrolled
- Mutations
- Index Term-Uncontrolled
- Phosphorylation
- Added Entry-Corporate Name
- Washington University in St. Louis Chemistry
- Host Item Entry
- Dissertations Abstracts International. 85-11B.
- Electronic Location and Access
- 로그인을 한후 보실 수 있는 자료입니다.
- Control Number
- joongbu:656890
MARC
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■020 ▼a9798382542355
■035 ▼a(MiAaPQ)AAI31295760
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a574
■1001 ▼aIslam, Md. Moydul.▼0(orcid)0000-0002-3828-9562
■24510▼aαB-Crystallin Phosphorylation Induces a Condensatopathy to Worsen Post-Myocardial Infarction Cardiomyopathy.
■260 ▼a[S.l.]▼bWashington University in St. Louis. ▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a158 p.
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-11, Section: B.
■500 ▼aAdvisor: Moeller, Kevin.
■5021 ▼aThesis (Ph.D.)--Washington University in St. Louis, 2024.
■520 ▼aRare genetic mutations in proteins expressed in cardiomyocytes lead to proteotoxic cardiomyopathies which are characterized by widespread protein-aggregate pathology. However, the mechanistic link between proteotoxicity and protein-aggregates in the more common ischemic cardiomyopathy remains unclear. Our study revealed the mis-localization of desmin, actin, and α-actinin to protein-aggregates in the myocardium of patients with ischemic cardiomyopathy and in mice hearts undergoing post-myocardial infarction ventricular remodeling. These findings mimic observations in autosomal-dominant cardiomyopathy resulting from the R120G mutation in the chaperone protein CRYAB where desmin is mis-localized into the aggregates. Importantly, we observed increased phosphorylation of CRYAB at serine-59 (pS59CRYAB) and its accumulation in the NP40-insoluble aggregate-rich fraction. Further investigation showed that CRYAB undergoes phase separation, and mimicking phosphorylation at serine-59 with an aspartate substitution reduced the fluidity of CRYAB condensates, promoting protein-aggregate formation and increased cell death. Conversely, substituting serine-59 with alanine, by preventing phosphorylation, restored the fluidity of CRYAB condensates and reduced protein aggregation. Moreover, introducing a phosphodeficient S59A mutation, but not the phospho-mimetic S59D mutation, at the CRYAB locus in mice rescued adverse left ventricular remodeling after ischemia reperfusion injury. Treatment with 25-Hydroxycholesterol attenuated serine-59 phosphorylation, increasing the fluidity of R120G-CRYAB condensates, and ameliorating post-myocardial infarction cardiac dysfunction. Experimental interventions aimed at preventing aggregate formation or promoting disaggregation exacerbated post-myocardial infarction cardiomyopathy, highlighting the importance of pS59CRYAB sequestration in aggregates to attenuate disease progression. These findings suggest that modulating CRYAB phase separation could offer a promising approach to mitigating ischemic cardiomyopathy.
■590 ▼aSchool code: 0252.
■650 4▼aBiochemistry.
■650 4▼aCellular biology.
■650 4▼aGenetics.
■653 ▼aCondensatopathy
■653 ▼aCardiomyopathy
■653 ▼aProtein aggregates
■653 ▼aMutations
■653 ▼aPhosphorylation
■690 ▼a0487
■690 ▼a0379
■690 ▼a0369
■71020▼aWashington University in St. Louis▼bChemistry.
■7730 ▼tDissertations Abstracts International▼g85-11B.
■790 ▼a0252
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17161729▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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