Click2―another near-perfect click reaction - 대한화학회

1537 Pages·2013·17 MB·English

대한화학회제112회총회및학술발표회(The112thGeneralMeetingoftheKoreanChemicalSociety)
일시:2013년 10월 16~18일(수~금)3일간
장소: 창원CECO
발표코드:PLEN-1
발표분야: 기조강연
발표종류: 특별강연, 발표일시: 목 13:30, 좌장: 김병문
Click2―another near-perfect click reaction
K.BarrySharpless
TheScrippsResearchInstitute
This sulfate-linking reaction depends on unusual acid-base characteristics. Like CuAAC, it is ultra-
reliable within its range of conditions, orthogonal, and a predictably reliable chemical linker.Unlike
CuAAC,Click2ismetalfree,thusinherentlycleanerandbio-friendly;compatible withseveralacid-base
catalysts; better at purifying products; and a natural for engineering thermoplastic polymers. Click2's
linkagedgroupsarelesspolar,butcan'tmatchCuAAC'sconditions.
대한화학회제112회총회및학술발표회(The112thGeneralMeetingoftheKoreanChemicalSociety)
일시:2013년 10월 16~18일(수~금)3일간
장소: 창원CECO
발표코드:AWARD-1
발표분야: 기념강연
발표종류: 기념강연, 발표일시: 금 09:00, 좌장: 미정
Novel Functional Polymer Nanostructure Systems: Synthesis,
Fabrication, Structure and Properties
이문호
포항공과대학교화학과
A series of well-defined brush, star, and block copolymer systems bearing various functional moieties
(biomolecules, mesogens, and charge-trapping molecules, and so on) were newly synthesized. All the
polymer werefoundtobethermallystableuptohightemperatures(200-500℃),providingaprocessand
utilization windows. Theyoftenself-assembled and formed various unique nanostructures, depending on
the chemical architecture and regularity as well as the thermal-annealing, solvent-annealing or their
combinations. Such self-assembly nanostructures and their orientation were successfully analyzed in
detail using synchrotron grazing incidence X-ray scattering and reflectivity; the determined
nanostructures were understood with considering favorable interactions of the polymer backbones and
functional moieties. The phase and surface characteristics in the self-assembled nanostructures can be
well controlled. In particular, biomolecule-containing brush polymer self-assemblies were successfully
controlled to always provide biomolecule rich surface over various processes, which are essential to
demonstrate excellent biocompabilities, anti-adherence of bacteria, anti-adsorption of proteins, and drug
deliveries. Moreover, some other interesting nanostructure systems demonstrated ultra-low dielectric
constant, programmable digital volatile and nonvolatile memories or liquid crystal controllability, which
arehighlydemandedforadvancedmicroelectronicsandflatpaneldisplays.
대한화학회제112회총회및학술발표회(The112thGeneralMeetingoftheKoreanChemicalSociety)
일시:2013년 10월 16~18일(수~금)3일간
장소: 창원CECO
발표코드:POLY1-6
발표분야:CurrentTrendsinBiomedicalPolymers
발표종류: 분과기념강연, 발표일시: 목 11:30, 좌장: 강영종
Photofunctional Nanodevices for BiomedicalApplication
장우동
연세대학교화학과
Photodynamictherapy(PDT)hasattractinginterestsaslessinvasivetreatmentforsolidtumors.Recently,
we have reported ionic dendrimer porphyrin (DP) and dendrimer phthalocyanine (DPc) as an efficient
photosensitizer for PDT. The charged ionic surface can form polyion complex micelles by means of
electrostatic interaction with oppositely charged block copolymer. The large dendritic wedges can
effectively prevent the aggregates formation of core porphyrin or phthalocyanine unit even in highly
concentrated micellar core. In this symposium, I would like to report recent results about the design of
multifunctional nano-devices for the combination cancer therapy and diagnosis. A polymer-metal
complex micelles (PMCMs) were formed by coordination interaction of CDDP with DPc and
poly(ethylene glycol)-block-poly(L-aspartic acid) (PEG-PLAn; molecular weight of PEG segment =
12,000g/mol;polymerizationdegreesofasparticacidsegmentn=68,96).PMCMshavegreatpotentials
as a biomedical nano-device for combination therapy as evidenced by the sustained release of CDDP
from PMCMs under physiological saline conditions and the generation of singlet oxygen under light
irradiation. LbL nano-capsules also have been prepared for the anticancer drug delivery as well as PDT.
Under light irradiation, the LbL nano-capsules exhibited strong photoinduced toxicity and controlled
releaseofanticancerdrug.Thedetailedaspectwillbereportedinthesymposium.
대한화학회제112회총회및학술발표회(The112thGeneralMeetingoftheKoreanChemicalSociety)
일시:2013년 10월 16~18일(수~금)3일간
장소: 창원CECO
발표코드:POLY1-1
발표분야:CurrentTrendsinBiomedicalPolymers
발표종류: 심포지엄, 발표일시: 목 09:15, 좌장: 이연
Multilayer Nano-platforms for BiomedicalApplications
홍진기
중앙대학교화학신소재공학부
Recent developments in biomaterials for tissue engineering, novel cell culture techniques, and newly
discoveredchemicalsasareplacementofthegrowthfactorshaveopenednewareatowardtheengineered
techniqueofbiomedicalapplications,foruseinbothresearchandclinicalapplications.Idealbio-platform
mustbe biocompatible thatis to say, theyshould showboth proper surface stabilityfor the promotionof
cell attachment and functions with drug delivery. However, plenty of challenges are still in progress, as
thereasonforthehighcompatibilityofpolymerfilmincellcultureenvironmentandpreciselycontrolled
functionalreleaseoftheirdrugs.Tofulfillsatisfactoryoftheserequirements,attentionhasturnedrecently
to not only introduce new materials but also developing nano-size controlled film structure of drug-
deliveryplatformsassuchfilmscanenhancethespecificfunctionsincludingstimulicell-differentiation,-
expansion, fightinginfectionand promoting wound-healing. Muchefforthasbeendevoted to controlling
drug release via manipulating the degradation or dissolution of the films. Layer-by-layer (LbL) self-
assembly technic has been developed and used to prepared biocompatible multilayer films and
polyelectrolyte capsules for drug delivery. Certain drug molecules, such as active proteins, cytokine,
growth factors, enzymes, nucleic acids, and DNA, have been immobilized into nano-sized multilayer
films.TheadvantagesofLbLmultilayerfilmsasdrugdeliverysystemsincludethevariationofcandidate
materials, also drug molecules itself can use as either functional drugs or components of the film, and
easy to combine to additional functions due to their evenly distributed structure. Furthermore sustained
drug release is possible through controlling the film physical & chemical properties, in addition
multilayer films have the potential to protect drug molecules from losing their biological functions, and
thefilmpreparationprocessissimpleandcanbeautomated.Thedrugreleasebehaviorofpolyelectrolyte
multilayer films depends on the permeability, the disassemblyor erosion of the multilayer structure, and
other experimental variables. In this presentation, we prepared the cell friendly platform by take full
advantages of LbL assembly with evenly distributed drug loading by nano-sized layer assembly. The
platforms are prepared by various materials including not only synthetic-, natural-polymers but also
functional materials such as growth factors, cytokines which are resulting different film degradation
profiles. In addition, we also introduced the functional objects into multilayer film, such as block
copolymer micelle as a drug container, nanotubes for enhanced mechanical strength. The structures
includingfunctionalobejctscouldbeveryusefulinachievingadditionalfunctionsforvariouscellstudies.
These results lay a cornerstone for future studies to achieve the multi-functional platforms including
programmedloading/releaseofdrugsfortherapeuticpurposes.
대한화학회제112회총회및학술발표회(The112thGeneralMeetingoftheKoreanChemicalSociety)
일시:2013년 10월 16~18일(수~금)3일간
장소: 창원CECO
발표코드:POLY1-2
발표분야:CurrentTrendsinBiomedicalPolymers
발표종류: 심포지엄, 발표일시: 목 09:40, 좌장: 이연
Effect of the Hydrated Viscoelastic Factor of the Polymer Surfaces on
the Cellular Responses
서지훈
TokyoMedicalandDentalUniversity
In this presentation, the effect of the hydrated viscoelastic factor of the polymer surfaces on the cellular
responses such as adhesion morphology, responding time, and differentiation, etc. will be introduced.
Various factors governing cellular responses to artificial materials have been studied in recent decades.
Even though it has been clarified that the magnitude of a cellular response, such as adhering density or
proliferationrate, isstronglydependentonthe proteindensityonthe materialsurface, the criticalfactors
that affect the cell functions are yet to be studied extensively. One of the traditional factors explaining
biologicalresponses,i.e.,surfacefreeenergyrepresentedbysurface wettability, wasprimarilyappliedto
discusstheoneofthecellularresponses,i.e.morphologyofadheringfibroblastsinthisstudy.However,it
wasconfirmedthatthe surfacefreeenergycouldnotexplainthe morphologyofadheringfibroblasts,but
could only be related to the amount of protein adsorption and the extent of cell adhesion, such as
projected cell area. Instead, the hydrated viscoelastic factor of polymer surfaces was confirmed as an
important factor that influences the morphology of adhering fibroblasts on the polymer surfaces. This
result suggests a novel concept, namely that hydrated viscoelastic factor should be considered when
discussing the cellular responses on the polymer surfaces, as distinct from the traditional concept of
surfacefreeenergy.
대한화학회제112회총회및학술발표회(The112thGeneralMeetingoftheKoreanChemicalSociety)
일시:2013년 10월 16~18일(수~금)3일간
장소: 창원CECO
발표코드:POLY1-3
발표분야:CurrentTrendsinBiomedicalPolymers
발표종류: 심포지엄, 발표일시: 목 10:05, 좌장: 이연
New polysaccharide-based thermogelling polymers for biomedical
applications
허강무
충남대학교고분자공학과
Over the past few years, thermogelling polymers that undergo a thermo-responsive sol?gel transition in
aqueous media have been extensively studied for various biomedical applications, especially for drug
delivery and injectable tissue engineering. These polymers have several advantages compared to other
polymerhydrogelsystems,andoffertheopportunitytoperformalessinvasivesurgicalprocedure.These
polymers can be loaded with pharmaceutical agents or cells by a simple mixing procedure in a solution
state, and injected into the target site where they form hydrogel depots and serve as carrier matrices for
localized drug delivery or cell growth. Several synthetic polymers are known to show such
thermoresponsive sol?gel transition behavior. Copolymers of poly(ethylene oxide) and poly(propylene
oxide) (known as poloxamer), and copolymers of N-isopropylacrylamide have been widely studied as
commercially available thermo-sensitive synthetic polymers. They could demonstrate excellent thermo-
sensitiveproperties,buttheirclinicalapplicationshavebeenlimitedduetotheirlackofbiodegradability,
biocompatibility and physical stability. Therefore, there has been a continuing need to develop a new
biodegradable thermogelling system with enhanced biocompatibilityand physical stability. In this study,
new thermo-responsive polymers were synthesized by N-acylation of glycol chitosan and evaluated as
thermogelling systems. Their physico-chemical and thermo-responsive properties were characterized in
terms of degradation, cytotoxicity, rheological properties, and in vitro and in vivo gel formation, and
evaluatedforseveralbiomedicalapplications.
대한화학회제112회총회및학술발표회(The112thGeneralMeetingoftheKoreanChemicalSociety)
일시:2013년 10월 16~18일(수~금)3일간
장소: 창원CECO
발표코드:POLY1-4
발표분야:CurrentTrendsinBiomedicalPolymers
발표종류: 심포지엄, 발표일시: 목 10:40, 좌장: 김태일
Molecularly Self-assembled NucleicAcid Nanoparticles for the
Delivery of RNAi Therapeutics
이혁진
이화여자대학교약학대학
Nanoparticles are useful for delivering therapeutics into cells. However, size, shape, surface chemistry
andthepresentationoftargetingligandsonthesurfaceofnanoparticlescanaffectcirculationhalf-lifeand
biodistribution, cell specific internalization, excretion, toxicity, and efficacy. A varietyof materials have
been explored for delivering small interfering RNAs (siRNAs) - a therapeutic agent that suppresses the
expression of targeted genes. However, conventional delivery nanoparticles such as liposomes and
polymeric systems are heterogeneous in size, composition and surface chemistry, and this can lead to
suboptimal performance, lack of tissue specificity and potential toxicity. Here, we show that self-
assembled DNA tetrahedral nanoparticles with a well-defined size can deliver siRNAs into cells and
silencetargetgenesintumours.
대한화학회제112회총회및학술발표회(The112thGeneralMeetingoftheKoreanChemicalSociety)
일시:2013년 10월 16~18일(수~금)3일간
장소: 창원CECO
발표코드:POLY1-5
발표분야:CurrentTrendsinBiomedicalPolymers
발표종류: 심포지엄, 발표일시: 목 11:05, 좌장: 김태일
Engineered Nanomaterials for EnhancedAntitumor andAntiviral
Effect
임용택
충남대학교분석과학기술대학원분석과학기술학과
The design and chemical synthesis of multifunctional nanomaterials have been providing potential
applications in biomedical fields such as molecular imaging and drug delivery. Recently, bio-derived
and/orsyntheticnanostructuredmaterialscapableofmodulatingtheimmunesystemhavebeenalsoissues
of interest in immunology-related nanomedicine fields. In this talk, the recent research results on the
developmentofnanostructuredmaterialsforenhancedimmunitywouldbepresented.Inthefirstpart, we
have designed and synthesized an immunomodulatory hybrid nanoconjugates (HNC) system based on
polymernanocompositescontainingquantumdots(QDs;asimagingtracers)thataredecoratedwithCpG
ODNs (as a TLR9 ligand) and STAT3 siRNAs (as an immunosuppressive gene silencer). These HNC
efficiently targeted immune cells, induced TLR activation, and silenced immunosuppressive genes.
Simultaneous in vivo delivery of STAT3 siRNA and CpG ODN to dendritic cells (DCs) in the tumor
microenvironment induced both the inhibition of STAT3 and activation of DCs by CpG ODNs, and
synergistically elicited anti-tumor effects. By using NIR-emitting QDs, the migration of in vivo DCs to
lymphnodeswasalsotrackedbyreal-timeNIRfluorescenceimaging.Inthesecondpart,wefocusonthe
developmentofa nanodeliverysystemfor the effective mucusdeliveryofa viralantigen thatcaninduce
strong mucosal immunity without additional immunostimulatory adjuvant materials, such as alum,
emulsion, and cationic lipid. To accomplish this goal, we designed and synthesized a mucosal vaccine
delivery system based on biosynthetic mucoadhesive polymer nanomicelles. We have also tested the
adjuvant function of nanomicelles in the presence of an influenza A viral antigen, that is, the inactivated
virusofinfluenza A/PuertoRico/8/34(PR8;H1N1).IntranasalimmunizationwithPR8inthepresenceof
nanomicelles induced high levels of functional antibodies and IFN-γ producing cells, suggesting that our
nanomicelle system could function as an effective adjuvant for inducing both humoral and cellular
immuneresponses.