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Responsive Dual Nanoparticle 19F Magnetic Resonance Molecular Imaging Probes
Responsive Dual Nanoparticle 19F Magnetic Resonance Molecular Imaging Probes
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211153109
- ISBN
- 9798384441250
- DDC
- 616
- 저자명
- Cooke, Daniel J.
- 서명/저자
- Responsive Dual Nanoparticle 19F Magnetic Resonance Molecular Imaging Probes
- 발행사항
- [Sl] : The University of Texas at Austin, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 169 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-04, Section: B.
- 주기사항
- Advisor: Que, Emily L.
- 학위논문주기
- Thesis (Ph.D.)--The University of Texas at Austin, 2024.
- 초록/해제
- 요약Noninvasive molecular imaging is a powerful tool for the diagnosis of disease. Magnetic resonance imaging (MRI) is an excellent candidate for molecular imaging due to a lack of ionizing radiation, high spatial resolution and unlimited penetration depth. 19F MRI benefits from a very low biological background signal and can provide complementary information to the more commonly used 1H MRI. This dissertation reports the study of responsive dual nanoparticle molecular imaging probes for 19F MRI. We use perfluorocarbon-encapsulated mesoporous silica nanoparticles (19F-MSNs) bound to a magnetic quencher nanoparticle to modulate the 19F MR signal. The nature of the linkage between the nanoparticles allows for signal "turn-on" in response to an external stimulus, facilitating specific detection of biological analytes or environments.We have developed a dual nanoparticle conjugate probe using superparamagnetic iron oxide nanoparticles (SPIONs) to quench the 19F MR signal of 19F-MSNs. Using DNA aptamers as linkers, a robust 19F MRI response is observed in live mice in the presence of thrombin. The use of DNA aptamers allows for versatility of analyte sensing. Improvements can be made to this probe using two main strategies: 1) Incorporating T1 shortening agents to increase the conspicuity of the probe; 2) Varying the size of the SPION and its distance to 19FMSNs. We propose that paramagnetic MnO nanoparticles incorporated into the perfluorocarbon phase of 19F-MSNs can enhance the 19F T1 relaxation time. The solubilization of MnO in perfluorocarbons necessitates ligand exchange with fluorinated ligands. The size of SPIONs affects their quenching strength and can be easily tuned by changing the synthetic parameters. The distance between SPIONs and 19F-MSNs is tunable by varying the length of the DNA linkers. We discuss methods to enhance the sensitivity of DNC by varying these parameters.Lastly, we are adapting the DNC platform to be a theranostic probe by replacing SPIONs with superparamagnetic FePt nanoparticles. We demonstrate that FePt nanoparticles are cytotoxic due to the release of Fe2+ and Pt2+ at low pH upon cellular uptake. FePt nanoparticles are bound to 19F-MSNs by a pHsensitive linker such that FePt is released from 19F-MSNs in the low pH extracellular tumor microenvironment.
- 일반주제명
- Medical imaging
- 일반주제명
- Molecular biology
- 일반주제명
- Nanoscience
- 키워드
- Nanoparticles
- 기타저자
- The University of Texas at Austin Chemistry
- 기본자료저록
- Dissertations Abstracts International. 86-04B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798384441250
■035 ▼a(MiAaPQ)AAI31690564
■035 ▼a(MiAaPQ)123vireo24688Cooke
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a616
■1001 ▼aCooke, Daniel J.
■24510▼aResponsive Dual Nanoparticle 19F Magnetic Resonance Molecular Imaging Probes
■260 ▼a[Sl]▼bThe University of Texas at Austin▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a169 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-04, Section: B.
■500 ▼aAdvisor: Que, Emily L.
■5021 ▼aThesis (Ph.D.)--The University of Texas at Austin, 2024.
■520 ▼aNoninvasive molecular imaging is a powerful tool for the diagnosis of disease. Magnetic resonance imaging (MRI) is an excellent candidate for molecular imaging due to a lack of ionizing radiation, high spatial resolution and unlimited penetration depth. 19F MRI benefits from a very low biological background signal and can provide complementary information to the more commonly used 1H MRI. This dissertation reports the study of responsive dual nanoparticle molecular imaging probes for 19F MRI. We use perfluorocarbon-encapsulated mesoporous silica nanoparticles (19F-MSNs) bound to a magnetic quencher nanoparticle to modulate the 19F MR signal. The nature of the linkage between the nanoparticles allows for signal "turn-on" in response to an external stimulus, facilitating specific detection of biological analytes or environments.We have developed a dual nanoparticle conjugate probe using superparamagnetic iron oxide nanoparticles (SPIONs) to quench the 19F MR signal of 19F-MSNs. Using DNA aptamers as linkers, a robust 19F MRI response is observed in live mice in the presence of thrombin. The use of DNA aptamers allows for versatility of analyte sensing. Improvements can be made to this probe using two main strategies: 1) Incorporating T1 shortening agents to increase the conspicuity of the probe; 2) Varying the size of the SPION and its distance to 19FMSNs. We propose that paramagnetic MnO nanoparticles incorporated into the perfluorocarbon phase of 19F-MSNs can enhance the 19F T1 relaxation time. The solubilization of MnO in perfluorocarbons necessitates ligand exchange with fluorinated ligands. The size of SPIONs affects their quenching strength and can be easily tuned by changing the synthetic parameters. The distance between SPIONs and 19F-MSNs is tunable by varying the length of the DNA linkers. We discuss methods to enhance the sensitivity of DNC by varying these parameters.Lastly, we are adapting the DNC platform to be a theranostic probe by replacing SPIONs with superparamagnetic FePt nanoparticles. We demonstrate that FePt nanoparticles are cytotoxic due to the release of Fe2+ and Pt2+ at low pH upon cellular uptake. FePt nanoparticles are bound to 19F-MSNs by a pHsensitive linker such that FePt is released from 19F-MSNs in the low pH extracellular tumor microenvironment.
■590 ▼aSchool code: 0227.
■650 4▼aMedical imaging
■650 4▼aMolecular biology
■650 4▼aNanoscience
■653 ▼aNoninvasive molecular imaging
■653 ▼aMagnetic resonance imaging
■653 ▼aNanoparticles
■653 ▼aBiological analytes
■690 ▼a0565
■690 ▼a0574
■690 ▼a0307
■71020▼aThe University of Texas at Austin▼bChemistry.
■7730 ▼tDissertations Abstracts International▼g86-04B.
■790 ▼a0227
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164976▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


