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Branches and Biguanides for Breaching Biological Barriers: The Design, Synthesis, and Evaluation of Novel Cationic Amphiphiles for the Delivery of Nucleic Acids and Antibiotics.
Branches and Biguanides for Breaching Biological Barriers: The Design, Synthesis, and Eval...
Branches and Biguanides for Breaching Biological Barriers: The Design, Synthesis, and Evaluation of Novel Cationic Amphiphiles for the Delivery of Nucleic Acids and Antibiotics.

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자료유형  
 학위논문(국외)
기본표목-개인명  
표제와 책임표시사항  
Branches and Biguanides for Breaching Biological Barriers: The Design, Synthesis, and Evaluation of Novel Cationic Amphiphiles for the Delivery of Nucleic Acids and Antibiotics.
발행, 배포, 간사 사항  
[S.l.] : Stanford University. , 2024
    발행, 배포, 간사 사항  
    Ann Arbor : ProQuest Dissertations & Theses , 2024
      형태사항  
      429 p.
      일반주기  
      Source: Dissertations Abstracts International, Volume: 87-01, Section: B.
      일반주기  
      Advisor: Wender, Paul.
      학위논문주기  
      Thesis (Ph.D.)--Stanford University, 2024.
      요약 등 주기  
      요약The delivery of therapeutics to their intended targets represents an omnipresent challenge for clinical advancements. Whether the drug is a small molecule or a polymer, its successful delivery across biological barriers will influence its final impact on the landscape of medicine and its impact on human health. Antibiotics and nucleic acids are in particular need of assistance due to the many biological and physical mechanisms that impede their efficacy. Antibiotics must penetrate the pathogen's thick membranes and extracellular matrices while nucleic acids must evade nucleases and enter the target cell's cytosol against an electrostatic potential. For these potentially lifesaving technologies to engage with their intended mode of action, they sometimes require the assistance of a transporter.Chapter 1 introduces these biological barriers and methods to breach them in greater detail before I describe in Chapter 2 the synthesis and characterization of dendrimeric technologies we originally developed to deliver mRNA but later exapted and elaborated upon for the treatment of ESKAPE pathogens through conjugation to vancomycin. These transporters explore a long standing question in our lab regarding the architecture of cationic displays and the resulting effects on biological efficacy. We uncover conjugation of a polyguanidino dendrimer will impart both improved activity against classical targets and novel and potent activity against canonically resistant pathogens.In Chapter 3, I detail the synthesis and characterization of archaea-inspired charge-altering releasable transporters (CART), representing our first excursion into studying the effects of branched lipid side chains on the efficacy, tolerability, and physical properties of CART-mRNA complexes. Within this chapter we describe the systematic variation of sidechain length and block length and its resulting effects on mRNA uptake and expression. Additionally, we uncover a complex emergent relationship between the primary structure of the lipid block and the intramolecular O-to-N acyl shift, characteristic to the neutralization of CART nanoparticles. After isoprenoid CARTs in vitrodisplayed up to 30-fold improvement over a previous gold-standard, we conclude with evaluating the efficacy of intramuscularly administrated isoprenoid CART nanoparticles and their role in a model OVA vaccination.In Chapter 4, I recount the synthesis and evaluation of bioinspired Glycerol-derived CARTs with degradable lipid chains. These materials are reminiscent of the lipidoids utilized in the lipid nanoparticle-based COVID vaccines due to their degradable ester linkages and branched structures. First, we discuss the triglyceride scaffold and examine the effects of lipid length, block length, and polar linker identity on the mRNA delivery efficacy of the co-oligomers. These are the first CART systems where we incorporate hydrogen bond-donors to the lipid block. Upon identifying a diverse set of structures with systematic variation, we screened their efficacy in PBMCs and optimized their ability to transfect primary NK-cells. These transfected NK-cells were then used in several HIV/AIDs related experiments to display enhanced killing of HIV latent cells.Finally, in Chapter 5, we return to the antimicrobial world to evaluate a novel class of antibiotic conjugates with a biguanide moiety. This relative of the guanidinium functional group hosts additional delocalization of the positive charge and additional hydrogen bond donor and acceptors.
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      주제명부출표목-일반주제명  
      부출표목-단체명  
      기본자료저록  
      Dissertations Abstracts International. 87-01B.
      전자적 위치 및 접속  
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      MARC

       008260219s2024        us  ||||||||||||||c||eng  d
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      ■035    ▼a(MiAaPQ)Stanfordxr716yr5538
      ■040    ▼aMiAaPQ▼cMiAaPQ
      ■0820  ▼a600
      ■1001  ▼aRahn,  Harrison  Patrick.
      ■24510▼aBranches  and  Biguanides  for  Breaching  Biological  Barriers:  The  Design,  Synthesis,  and  Evaluation  of  Novel  Cationic  Amphiphiles  for  the  Delivery  of  Nucleic  Acids  and  Antibiotics.
      ■260    ▼a[S.l.]▼bStanford  University.  ▼c2024
      ■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
      ■300    ▼a429  p.
      ■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-01,  Section:  B.
      ■500    ▼aAdvisor:  Wender,  Paul.
      ■5021  ▼aThesis  (Ph.D.)--Stanford  University,  2024.
      ■520    ▼aThe  delivery  of  therapeutics  to  their  intended  targets  represents  an  omnipresent  challenge  for  clinical  advancements.  Whether  the  drug  is  a  small  molecule  or  a  polymer,  its  successful  delivery  across  biological  barriers  will  influence  its  final  impact  on  the  landscape  of  medicine  and  its  impact  on  human  health.  Antibiotics  and  nucleic  acids  are  in  particular  need  of  assistance  due  to  the  many  biological  and  physical  mechanisms  that  impede  their  efficacy.  Antibiotics  must  penetrate  the  pathogen's  thick  membranes  and  extracellular  matrices  while  nucleic  acids  must  evade  nucleases  and  enter  the  target  cell's  cytosol  against  an  electrostatic  potential.  For  these  potentially  lifesaving  technologies  to  engage  with  their  intended  mode  of  action,  they  sometimes  require  the  assistance  of  a  transporter.Chapter  1  introduces  these  biological  barriers  and  methods  to  breach  them  in  greater  detail  before  I  describe  in  Chapter  2  the  synthesis  and  characterization  of  dendrimeric  technologies  we  originally  developed  to  deliver  mRNA  but  later  exapted  and  elaborated  upon  for  the  treatment  of  ESKAPE  pathogens  through  conjugation  to  vancomycin.  These  transporters  explore  a  long  standing  question  in  our  lab  regarding  the  architecture  of  cationic  displays  and  the  resulting  effects  on  biological  efficacy.  We  uncover  conjugation  of  a  polyguanidino  dendrimer  will  impart  both  improved  activity  against  classical  targets  and  novel  and  potent  activity  against  canonically  resistant  pathogens.In  Chapter  3,  I  detail  the  synthesis  and  characterization  of  archaea-inspired  charge-altering  releasable  transporters  (CART),  representing  our  first  excursion  into  studying  the  effects  of  branched  lipid  side  chains  on  the  efficacy,  tolerability,  and  physical  properties  of  CART-mRNA  complexes.  Within  this  chapter  we  describe  the  systematic  variation  of  sidechain  length  and  block  length  and  its  resulting  effects  on  mRNA  uptake  and  expression.  Additionally,  we  uncover  a  complex  emergent  relationship  between  the  primary  structure  of  the  lipid  block  and  the  intramolecular  O-to-N  acyl  shift,  characteristic  to  the  neutralization  of  CART  nanoparticles.  After  isoprenoid  CARTs  in  vitrodisplayed  up  to  30-fold  improvement  over  a  previous  gold-standard,  we  conclude  with  evaluating  the  efficacy  of  intramuscularly  administrated  isoprenoid  CART  nanoparticles  and  their  role  in  a  model  OVA  vaccination.In  Chapter  4,  I  recount  the  synthesis  and  evaluation  of  bioinspired  Glycerol-derived  CARTs  with  degradable  lipid  chains.  These  materials  are  reminiscent  of  the  lipidoids  utilized  in  the  lipid  nanoparticle-based  COVID  vaccines  due  to  their  degradable  ester  linkages  and  branched  structures.  First,  we  discuss  the  triglyceride  scaffold  and  examine  the  effects  of  lipid  length,  block  length,  and  polar  linker  identity  on  the  mRNA  delivery  efficacy  of  the  co-oligomers.  These  are  the  first  CART  systems  where  we  incorporate  hydrogen  bond-donors  to  the  lipid  block.  Upon  identifying  a  diverse  set  of  structures  with  systematic  variation,  we  screened  their  efficacy  in  PBMCs  and  optimized  their  ability  to  transfect  primary  NK-cells.  These  transfected  NK-cells  were  then  used  in  several  HIV/AIDs  related  experiments  to  display  enhanced  killing  of  HIV  latent  cells.Finally,  in  Chapter  5,  we  return  to  the  antimicrobial  world  to  evaluate  a  novel  class  of  antibiotic  conjugates  with  a  biguanide  moiety.  This  relative  of  the  guanidinium  functional  group  hosts  additional  delocalization  of  the  positive  charge  and  additional  hydrogen  bond  donor  and  acceptors.
      ■590    ▼aSchool  code:  0212.
      ■650  4▼aPathogens.
      ■650  4▼aAcids.
      ■650  4▼aToxicity.
      ■650  4▼aCytotoxicity.
      ■650  4▼aBioluminescence.
      ■650  4▼aE  coli.
      ■650  4▼aFlow  cytometry.
      ■650  4▼aLipids.
      ■650  4▼aImmunization.
      ■650  4▼aOrganic  chemistry.
      ■650  4▼aMass  spectrometry.
      ■650  4▼aCells.
      ■650  4▼aPermeability.
      ■650  4▼aAntibiotics.
      ■650  4▼aDesign.
      ■650  4▼aKinetics.
      ■650  4▼aAlcohol.
      ■650  4▼aHydrogenation.
      ■690    ▼a0490
      ■690    ▼a0389
      ■71020▼aStanford  University.
      ■7730  ▼tDissertations  Abstracts  International▼g87-01B.
      ■790    ▼a0212
      ■791    ▼aPh.D.
      ■792    ▼a2024
      ■793    ▼aEnglish
      ■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358745▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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