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Vibrational Imaging for Chemical Biology: From Label-Free to Molecular Probes
Vibrational Imaging for Chemical Biology: From Label-Free to Molecular Probes
Vibrational Imaging for Chemical Biology: From Label-Free to Molecular Probes

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20260209102931
ISBN  
9798290629308
DDC  
616
저자명  
Du, Jiajun.
서명/저자  
Vibrational Imaging for Chemical Biology: From Label-Free to Molecular Probes
발행사항  
[Sl] : California Institute of Technology, 2023
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2023
형태사항  
258 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-01, Section: B.
주기사항  
Advisor: Wei, Lu.
학위논문주기  
Thesis (Ph.D.)--California Institute of Technology, 2023.
초록/해제  
요약Since the invention of stimulated Raman scattering (SRS) microscopy in 2008, vibrational imaging is increasingly recognized as a powerful tool for biological investigation. As the most suitable far field vibrational imaging modality for live biological studies, SRS microscopy is taking the lead role within its vibrational counterparts with desired sensitivity and image quality. The totally different mechanism of generating vibration signals from fluorescence signals determines the special features of vibrational imaging. Bond vibration originating signals provide inherent optical contrast for every molecule and the quantitative manner allows straightforward quantification. Since the inception, SRS microscopy has achieved large success in label-free imaging. Label-free imaging avoids tedious labeling step and has the least perturbation to the biological samples but with limited sensitivity and specificity. The introducing of labeling starting about 10 years ago opens up a new avenue for SRS microscopy to tackle the fundamental limitations of label-free approaches. Whether to use label-free or molecular probes for SRS microscopy depends on the specific studies. This thesis aims to utilize SRS microscopy (both label-free and minimally labeling) for metabolic study and develop new molecular probes for SRS microscopy.We start from comparing different vibrational imaging modality and fluorescence imaging and conclude that SRS is the best vibrational imaging technique for biological samples. Then we discuss the features of label-free, bioorthogonal labeling and super-multiplexed SRS imaging. The minimally perturbative triple bond tagging and isotope labeling makes SRS especially suitable for tracking metabolites and accessing metabolic pathways. Furthermore, we also summarize the design principles for functional Raman imaging probe development based on their spectroscopic signatures. (Chapter Ⅰ)Non-invasively probing metabolites within single live cells is highly desired but challenging. We explored Raman spectro-microscopy towards spatially-resolved single cell metabolomics, with the specific goal of identifying druggable metabolic susceptibilities from a series of patient-derived melanoma cell lines. The chemical composition analysis of single cell and single organelle lipid droplets identified the fatty acid synthesis pathway and lipid mono-unsaturation as druggable susceptibility. More importantly we revealed that inhibiting lipid mono-unsaturation leads to cellular apoptosis accompanied by the formation of phaseseparated intracellular membrane domains. (Chapter Ⅱ)Next, we established a first-in-class design of multi-color photoactivatable Raman probes for subcellular imaging and tracking. The fast photochemically generated alkynes from cyclopropenones enable background-free Raman imaging with desired photocontrollable features. After necessary molecule engineering to improve the biocompatibility and sensitivity, we generated organelle-specific probes for targeting mitochondria, lipid droplets, endoplasmic reticulum, and lysosomes. Multiplexed photoactivated imaging and tracking at both subcellular and single-cell levels was also demonstrated to monitor the dynamic migration and interactions of the cellular contents. (Chapter Ⅲ)Further improvement of the Raman signal with molecular probes is a central topic for Raman imaging. Recently developed electronic preresonance (epr) probes boost Raman signals and pushed SRS sensitivity close to that offered by confocal fluorescence microscopy. To guide the development of even stronger Raman probes and fill the final gap between epr-SRS probes and single molecule imaging, the structure-function relationship of epr-SRS probes is indispensable. We therefore used ab initio approach employing the displaced harmonic oscillator (DHO) model for calculating the epr-SRS signals, which proves to provide a consistent agreement between simulated and experimental SRS intensities of various triplebond bearing epr-SRS probes. The theory also allows us to illustrate how the observed intensity differences between molecular scaffolds stem from the coupling strength between the electronic excitation and the targeted vibrational mode. Utilizing the discovered structure-function relationship of epr-SRS probes, we engineered MARS palette for higher sensitivity. With chemical modification to improve Raman mode displacement or enhance transition dipole moment or adjust detuning, we enhance the signal of alkynyl pyronins and nitrile pyronins, setting the current sensitivity records for small molecule far-field Raman probes. (Chapter Ⅳ&Ⅴ).
일반주제명  
Cancer
일반주제명  
Metastasis
일반주제명  
Carbohydrates
일반주제명  
Fatty acids
일반주제명  
Families & family life
일반주제명  
Amino acids
일반주제명  
Biology
일반주제명  
Energy
일반주제명  
Metabolism
일반주제명  
Lipids
일반주제명  
Apoptosis
일반주제명  
Vibration
일반주제명  
Cells
일반주제명  
Microscopy
일반주제명  
Isotopes
일반주제명  
Glucose
일반주제명  
Engineering
일반주제명  
Chemical bonds
일반주제명  
Melanoma
일반주제명  
Metabolites
기타저자  
California Institute of Technology Chemistry and Chemical Engineering
기본자료저록  
Dissertations Abstracts International. 87-01B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aDu,  Jiajun.
■24510▼aVibrational  Imaging  for  Chemical  Biology:  From  Label-Free  to  Molecular  Probes
■260    ▼a[Sl]▼bCalifornia  Institute  of  Technology▼c2023
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2023
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■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-01,  Section:  B.
■500    ▼aAdvisor:  Wei,  Lu.
■5021  ▼aThesis  (Ph.D.)--California  Institute  of  Technology,  2023.
■520    ▼aSince  the  invention  of  stimulated  Raman  scattering  (SRS)  microscopy  in  2008,  vibrational  imaging  is  increasingly  recognized  as  a  powerful  tool  for  biological  investigation.  As  the  most  suitable  far  field  vibrational  imaging  modality  for  live  biological  studies,  SRS  microscopy  is  taking  the  lead  role  within  its  vibrational  counterparts  with  desired  sensitivity  and  image  quality.  The  totally  different  mechanism  of  generating  vibration  signals  from  fluorescence  signals  determines  the  special  features  of  vibrational  imaging.  Bond  vibration  originating  signals  provide  inherent  optical  contrast  for  every  molecule  and  the  quantitative  manner  allows  straightforward  quantification.  Since  the  inception,  SRS  microscopy  has  achieved  large  success  in  label-free  imaging.  Label-free  imaging  avoids  tedious  labeling  step  and  has  the  least  perturbation  to  the  biological  samples  but  with  limited  sensitivity  and  specificity.  The  introducing  of  labeling  starting  about  10  years  ago  opens  up  a  new  avenue  for  SRS  microscopy  to  tackle  the  fundamental  limitations  of  label-free  approaches.  Whether  to  use  label-free  or  molecular  probes  for  SRS  microscopy  depends  on  the  specific  studies.  This  thesis  aims  to  utilize  SRS  microscopy  (both  label-free  and  minimally  labeling)  for  metabolic  study  and  develop  new  molecular  probes  for  SRS  microscopy.We  start  from  comparing  different  vibrational  imaging  modality  and  fluorescence  imaging  and  conclude  that  SRS  is  the  best  vibrational  imaging  technique  for  biological  samples.  Then  we  discuss  the  features  of  label-free,  bioorthogonal  labeling  and  super-multiplexed  SRS  imaging.  The  minimally  perturbative  triple  bond  tagging  and  isotope  labeling  makes  SRS  especially  suitable  for  tracking  metabolites  and  accessing  metabolic  pathways.  Furthermore,  we  also  summarize  the  design  principles  for  functional  Raman  imaging  probe  development  based  on  their  spectroscopic  signatures.  (Chapter  Ⅰ)Non-invasively  probing  metabolites  within  single  live  cells  is  highly  desired  but  challenging.  We  explored  Raman  spectro-microscopy  towards  spatially-resolved  single  cell  metabolomics,  with  the  specific  goal  of  identifying  druggable  metabolic  susceptibilities  from  a  series  of  patient-derived  melanoma  cell  lines.  The  chemical  composition  analysis  of  single  cell  and  single  organelle  lipid  droplets  identified  the  fatty  acid  synthesis  pathway  and  lipid  mono-unsaturation  as  druggable  susceptibility.  More  importantly  we  revealed  that  inhibiting  lipid  mono-unsaturation  leads  to  cellular  apoptosis  accompanied  by  the  formation  of  phaseseparated  intracellular  membrane  domains.  (Chapter  Ⅱ)Next,  we  established  a  first-in-class  design  of  multi-color  photoactivatable  Raman  probes  for  subcellular  imaging  and  tracking.  The  fast  photochemically  generated  alkynes  from  cyclopropenones  enable  background-free  Raman  imaging  with  desired  photocontrollable  features.  After  necessary  molecule  engineering  to  improve  the  biocompatibility  and  sensitivity,  we  generated  organelle-specific  probes  for  targeting  mitochondria,  lipid  droplets,  endoplasmic  reticulum,  and  lysosomes.  Multiplexed  photoactivated  imaging  and  tracking  at  both  subcellular  and  single-cell  levels  was  also  demonstrated  to  monitor  the  dynamic  migration  and  interactions  of  the  cellular  contents.  (Chapter  Ⅲ)Further  improvement  of  the  Raman  signal  with  molecular  probes  is  a  central  topic  for  Raman  imaging.  Recently  developed  electronic  preresonance  (epr)  probes  boost  Raman  signals  and  pushed  SRS  sensitivity  close  to  that  offered  by  confocal  fluorescence  microscopy.  To  guide  the  development  of  even  stronger  Raman  probes  and  fill  the  final  gap  between  epr-SRS  probes  and  single  molecule  imaging,  the  structure-function  relationship  of  epr-SRS  probes  is  indispensable.  We  therefore  used  ab  initio  approach  employing  the  displaced  harmonic  oscillator  (DHO)  model  for  calculating  the  epr-SRS  signals,  which  proves  to  provide  a  consistent  agreement  between  simulated  and  experimental  SRS  intensities  of  various  triplebond  bearing  epr-SRS  probes.  The  theory  also  allows  us  to  illustrate  how  the  observed  intensity  differences  between  molecular  scaffolds  stem  from  the  coupling  strength  between  the  electronic  excitation  and  the  targeted  vibrational  mode.  Utilizing  the  discovered  structure-function  relationship  of  epr-SRS  probes,  we  engineered  MARS  palette  for  higher  sensitivity.  With  chemical  modification  to  improve  Raman  mode  displacement  or  enhance  transition  dipole  moment  or  adjust  detuning,  we  enhance  the  signal  of  alkynyl  pyronins  and  nitrile  pyronins,  setting  the  current  sensitivity  records  for  small  molecule  far-field  Raman  probes.  (Chapter  Ⅳ&Ⅴ).
■590    ▼aSchool  code:  0037.
■650  4▼aCancer
■650  4▼aMetastasis
■650  4▼aCarbohydrates
■650  4▼aFatty  acids
■650  4▼aFamilies  &  family  life
■650  4▼aAmino  acids
■650  4▼aBiology
■650  4▼aEnergy
■650  4▼aMetabolism
■650  4▼aLipids
■650  4▼aApoptosis
■650  4▼aVibration
■650  4▼aCells
■650  4▼aMicroscopy
■650  4▼aIsotopes
■650  4▼aGlucose
■650  4▼aEngineering
■650  4▼aChemical  bonds
■650  4▼aMelanoma
■650  4▼aMetabolites
■690    ▼a0791
■690    ▼a0306
■690    ▼a0537
■71020▼aCalifornia  Institute  of  Technology▼bChemistry  and  Chemical  Engineering.
■7730  ▼tDissertations  Abstracts  International▼g87-01B.
■790    ▼a0037
■791    ▼aPh.D.
■792    ▼a2023
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17366033▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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