Small-molecule prodrug nanoassemblies have emerged as efficient antitumor drug delivery systems.However,in the case of camptothecins-based prodrug nanoassemblies,linear aliphatic side chain modification often results ...Small-molecule prodrug nanoassemblies have emerged as efficient antitumor drug delivery systems.However,in the case of camptothecins-based prodrug nanoassemblies,linear aliphatic side chain modification often results in rod-shaped or irregularly shaped nanoassemblies,which are highly unfavorable for sterilization through filtration,and may cause capillary blockage upon intravenous injection.The rational design of camptothecins-based prodrug nanoassemblies remains a challenge.Herein,we propose that branched aliphatic alcohol(BAA)functionalization could fine-tune the structure-tolerance-antitumor efficacy axis of prodrug nanoassemblies.Correspondingly,four SN38-BAA prodrugs were synthesized by conjugating 7-ethyl-10-hydroxycamptothecin(SN38)with BAAs of varying lengths via a tumor redox-responsive disulfide bond,which self-assemble into uniform spherical nanoparticles.The length of BAA was found to significant impact the multiple drug delivery process,including colloidal stability,drug release profiles and pharmacokinetics.Overall,SN38-C21 NPs(SN38-11-heneicosanol nanoparticles),featuring the longest BAA,showcased multiple therapeutic advantages,ultimately culminating the optimal antitumor efficacy and tolerance.The findings underscore the potential of BAA functionalization in strengthening the therapeutic outcomes of prodrug nanoassemblies,and provide valuable insights for developing translational camptothecins-based nanomedicines.展开更多
The reduction-responsive disulfide bonds have been widely used as bioactive linkages to facilitate a rapid release of anticancer drugs into tumor cells.However,the activation can be hindered by the kinetics of the thi...The reduction-responsive disulfide bonds have been widely used as bioactive linkages to facilitate a rapid release of anticancer drugs into tumor cells.However,the activation can be hindered by the kinetics of the thiol-disulfide exchange reactions.Supplementing with an additional reductant is a promising strategy to further boost drug release.Herein,inspired by the specific absorption mechanism of triglyceride fat,structured lipid-mimetic oral prodrugs of 7-ethyl-10-hydroxycamptothecin(SN38)were designed to improve intestinal permeability and bypass the first-pass effect.SN38 prodrugs were prepared into lipid formulations that could self-emulsify into nano-sized particles after entering the gastrointestinal tract.Surprisingly,we found that the oral bioavailability of the prodrug lipid formulation could be up to 2.69-fold higher than that of the parent SN38,indicating an effective oral delivery.In addition,the reduction-responsive disulfide bond was used as a linker,and ascorbic acid(ASC)was coadministrated to further promote the efficient release of SN38 from the prodrug.ASC enhanced the oral antitumor effect of the reduction-responsive oral prodrug and exhibited good safety.In summary,the combination of a structured lipid-mimetic prodrug and ASC was firstly demonstrated to boost the oral chemotherapy effect of the difficult-for-oral chemotherapeutics.展开更多
Nanotheranostics with comprehensive diagnostic and therapeutic capabilities show exciting cancer treatment potentials.Here,we develop an excipient-free drug delivery system for cancer diagnosis as well as therapy,in w...Nanotheranostics with comprehensive diagnostic and therapeutic capabilities show exciting cancer treatment potentials.Here,we develop an excipient-free drug delivery system for cancer diagnosis as well as therapy,in which a near infra-red photosensitizer and a chemotherapeutic drug can be self-delivered without any carriers.The building block of the drug delivery system was synthesized by covalently conjugating four anticancer drugs(7-ethyl-10-hydroxy-camptothecin,SN-38)with a photosensitizer(porphyrin)via hydrolyzable ester linkage,which endows the drug delivery system with 100%active pharmaceutical ingredients,excellent imaging,and therapeutic functionalities.The conjugates can readily self-assemble into nanosheets(PS NSs)and remain stable for at least 20 days in aqueous solution.In PS NSs,fluorescence resonance energy transfer(FRET)dominates the fluorescence of SN-38 and enables to monitor the drug release fluorescentiy.The PS NSs also show excellent anticancer activity in vitro,due to the increased cell uptake with the synergistic effect of photodynamic therapy and chemotherapy.展开更多
基金supported by National Natural Science Foundation of China(Nos.82272151,82204318 and 82173766)Doctoral Scientific Research Staring Foundation of Liaoning Province(No.2021-BS-130)+1 种基金General Program of Department of Education of Liaoning Province(No.LJKZ0953)Shenyang Young and Middle-aged Science and Technology Innovation Talent Support Program(No.RC220389).
文摘Small-molecule prodrug nanoassemblies have emerged as efficient antitumor drug delivery systems.However,in the case of camptothecins-based prodrug nanoassemblies,linear aliphatic side chain modification often results in rod-shaped or irregularly shaped nanoassemblies,which are highly unfavorable for sterilization through filtration,and may cause capillary blockage upon intravenous injection.The rational design of camptothecins-based prodrug nanoassemblies remains a challenge.Herein,we propose that branched aliphatic alcohol(BAA)functionalization could fine-tune the structure-tolerance-antitumor efficacy axis of prodrug nanoassemblies.Correspondingly,four SN38-BAA prodrugs were synthesized by conjugating 7-ethyl-10-hydroxycamptothecin(SN38)with BAAs of varying lengths via a tumor redox-responsive disulfide bond,which self-assemble into uniform spherical nanoparticles.The length of BAA was found to significant impact the multiple drug delivery process,including colloidal stability,drug release profiles and pharmacokinetics.Overall,SN38-C21 NPs(SN38-11-heneicosanol nanoparticles),featuring the longest BAA,showcased multiple therapeutic advantages,ultimately culminating the optimal antitumor efficacy and tolerance.The findings underscore the potential of BAA functionalization in strengthening the therapeutic outcomes of prodrug nanoassemblies,and provide valuable insights for developing translational camptothecins-based nanomedicines.
基金supported by the National Key Research and Development Program of China(No.2021YFA0909900)the National Natural Science Foundation of China(Nos.82073777,82104109,and 82173766).
文摘The reduction-responsive disulfide bonds have been widely used as bioactive linkages to facilitate a rapid release of anticancer drugs into tumor cells.However,the activation can be hindered by the kinetics of the thiol-disulfide exchange reactions.Supplementing with an additional reductant is a promising strategy to further boost drug release.Herein,inspired by the specific absorption mechanism of triglyceride fat,structured lipid-mimetic oral prodrugs of 7-ethyl-10-hydroxycamptothecin(SN38)were designed to improve intestinal permeability and bypass the first-pass effect.SN38 prodrugs were prepared into lipid formulations that could self-emulsify into nano-sized particles after entering the gastrointestinal tract.Surprisingly,we found that the oral bioavailability of the prodrug lipid formulation could be up to 2.69-fold higher than that of the parent SN38,indicating an effective oral delivery.In addition,the reduction-responsive disulfide bond was used as a linker,and ascorbic acid(ASC)was coadministrated to further promote the efficient release of SN38 from the prodrug.ASC enhanced the oral antitumor effect of the reduction-responsive oral prodrug and exhibited good safety.In summary,the combination of a structured lipid-mimetic prodrug and ASC was firstly demonstrated to boost the oral chemotherapy effect of the difficult-for-oral chemotherapeutics.
基金The authors gratefully acknowledge the support from Dr.Lis faculty startup funds at UC Davis and Dr.Xues National Natural Science Foundation of China(NSFC)(No.81803002).
文摘Nanotheranostics with comprehensive diagnostic and therapeutic capabilities show exciting cancer treatment potentials.Here,we develop an excipient-free drug delivery system for cancer diagnosis as well as therapy,in which a near infra-red photosensitizer and a chemotherapeutic drug can be self-delivered without any carriers.The building block of the drug delivery system was synthesized by covalently conjugating four anticancer drugs(7-ethyl-10-hydroxy-camptothecin,SN-38)with a photosensitizer(porphyrin)via hydrolyzable ester linkage,which endows the drug delivery system with 100%active pharmaceutical ingredients,excellent imaging,and therapeutic functionalities.The conjugates can readily self-assemble into nanosheets(PS NSs)and remain stable for at least 20 days in aqueous solution.In PS NSs,fluorescence resonance energy transfer(FRET)dominates the fluorescence of SN-38 and enables to monitor the drug release fluorescentiy.The PS NSs also show excellent anticancer activity in vitro,due to the increased cell uptake with the synergistic effect of photodynamic therapy and chemotherapy.
