Alzheimer’s disease is a neurodegenerative disease induced by multiple interconnected mechanisms.Peptide drug candidates with multi-modal efficacy generated from fusion strategy are suitable for addressing multi-face...Alzheimer’s disease is a neurodegenerative disease induced by multiple interconnected mechanisms.Peptide drug candidates with multi-modal efficacy generated from fusion strategy are suitable for addressing multi-facet pathology.However,clinical translation of peptide drugs is greatly hampered by their low permeability into brain.Herein,a hybrid peptide HNSS is generated by merging two therapeutic peptides(SS31 and S-14 G Humanin(HNG)),using a different approach from the classical shuttle-therapeutic peptide conjugate design.HNSS demonstrated increased bio-permeability,with a 2-fold improvement in brain distribution over HNG,thanks to its structure mimicking the design of signal peptide-derived cell-penetrating peptides.HNSS efficiently alleviated mitochondrial dysfunction through the combined effects of mitochondrial targeting,ROS scavenging and p-STAT3 activation.Meanwhile,HNSS with increased Aβaffinity greatly inhibited Aβoligomerization/fibrillation,and interrupted Aβinteraction with neuron/microglia by reducing neuronal mitochondrial Aβdeposition and promoting microglial phagocytosis of Aβ.In3×Tg-AD transgenic mice,HNSS treatment efficiently inhibited brain neuron loss and improved the cognitive performance.This work validates the rational fusion design-based strategy for bio-permeability improvement and efficacy amplification,providing a paradigm for developing therapeutic peptide candidates against neurodegenerative disease.展开更多
Diabetic wound healing has become a serious healthcare challenge.The high-glucose environment leads to persistent bacterial infection and mitochondrial dysfunction,resulting in chronic inflammation,abnormal vascular f...Diabetic wound healing has become a serious healthcare challenge.The high-glucose environment leads to persistent bacterial infection and mitochondrial dysfunction,resulting in chronic inflammation,abnormal vascular function,and tissue necrosis.To solve these issues,we developed a double-network hydrogel,constructed with pluronic F127 diacrylate(F127DA)and hyaluronic acid methacrylate(HAMA),and enhanced by SS31-loaded mesoporous polydopamine nanoparticles(MPDA NPs).As components,SS31,a mitochondria-targeted peptide,maintains mitochondrial function,reduces mitochondrial reactive oxygen species(ROS)and thus regulates macrophage polarization,as well as promoting cell proliferation and migration,while MPDA NPs not only scavenge ROS and exert an anti-bacterial effect by photothermal treatment under near-infrared light irradiation,but also control release of SS31 in response to ROS.This F127DA/HAMA-MPDA@SS31(FH-M@S)hydrogel has characteristics of adhesion,superior biocompatibility and mechanical properties which can adapt to irregular wounds at different body sites and provide sustained release of MPDA@SS31(M@S)NPs.In addition,in a diabetic rat full thickness skin defect model,the FH-M@S hydrogel promoted macrophage M2 polarization,collagen deposition,neovascularization and wound healing.Therefore,the FH-M@S hydrogel exhibits promising therapeutic potential for skin regeneration.展开更多
基金supported by National Natural Science Foundation of China(82273868 and 82073780)Shanghai Municipal Natural Science Foundation(19ZR1406200).
文摘Alzheimer’s disease is a neurodegenerative disease induced by multiple interconnected mechanisms.Peptide drug candidates with multi-modal efficacy generated from fusion strategy are suitable for addressing multi-facet pathology.However,clinical translation of peptide drugs is greatly hampered by their low permeability into brain.Herein,a hybrid peptide HNSS is generated by merging two therapeutic peptides(SS31 and S-14 G Humanin(HNG)),using a different approach from the classical shuttle-therapeutic peptide conjugate design.HNSS demonstrated increased bio-permeability,with a 2-fold improvement in brain distribution over HNG,thanks to its structure mimicking the design of signal peptide-derived cell-penetrating peptides.HNSS efficiently alleviated mitochondrial dysfunction through the combined effects of mitochondrial targeting,ROS scavenging and p-STAT3 activation.Meanwhile,HNSS with increased Aβaffinity greatly inhibited Aβoligomerization/fibrillation,and interrupted Aβinteraction with neuron/microglia by reducing neuronal mitochondrial Aβdeposition and promoting microglial phagocytosis of Aβ.In3×Tg-AD transgenic mice,HNSS treatment efficiently inhibited brain neuron loss and improved the cognitive performance.This work validates the rational fusion design-based strategy for bio-permeability improvement and efficacy amplification,providing a paradigm for developing therapeutic peptide candidates against neurodegenerative disease.
文摘Diabetic wound healing has become a serious healthcare challenge.The high-glucose environment leads to persistent bacterial infection and mitochondrial dysfunction,resulting in chronic inflammation,abnormal vascular function,and tissue necrosis.To solve these issues,we developed a double-network hydrogel,constructed with pluronic F127 diacrylate(F127DA)and hyaluronic acid methacrylate(HAMA),and enhanced by SS31-loaded mesoporous polydopamine nanoparticles(MPDA NPs).As components,SS31,a mitochondria-targeted peptide,maintains mitochondrial function,reduces mitochondrial reactive oxygen species(ROS)and thus regulates macrophage polarization,as well as promoting cell proliferation and migration,while MPDA NPs not only scavenge ROS and exert an anti-bacterial effect by photothermal treatment under near-infrared light irradiation,but also control release of SS31 in response to ROS.This F127DA/HAMA-MPDA@SS31(FH-M@S)hydrogel has characteristics of adhesion,superior biocompatibility and mechanical properties which can adapt to irregular wounds at different body sites and provide sustained release of MPDA@SS31(M@S)NPs.In addition,in a diabetic rat full thickness skin defect model,the FH-M@S hydrogel promoted macrophage M2 polarization,collagen deposition,neovascularization and wound healing.Therefore,the FH-M@S hydrogel exhibits promising therapeutic potential for skin regeneration.
