Calcium sulfate(CaSO_(4))has been verified as a promising oxygen carrier(OC)in the chemical looping combustion(CLC)for its high oxygen capacity,abundant reserve and low cost,but its low reactivity and deleterious sulf...Calcium sulfate(CaSO_(4))has been verified as a promising oxygen carrier(OC)in the chemical looping combustion(CLC)for its high oxygen capacity,abundant reserve and low cost,but its low reactivity and deleterious sulfur species emission from the side reactions of CaSO_(4) should be well considered for its wide application in CLC.In order to promote the reactivity of CaSO_(4) and increase its potential to inhibit the gaseous sulfur emission,a CeO_(2)-enhanced CaSO_(4) OC mixed OC of core–shell structure was prepared using the combined template synthesis method.Reaction characteristics of the prepared CaSO_(4)-CeO_(2) mixed OC with a typical lignite was first conducted and systematically investigated,and an improved reactivity of the prepared CaSO_(4)-CeO_(2) mixed OC was demonstrated than its single component CaSO_(4) or CeO_(2) due to the fast transfer and exchange of oxygen from the CaSO_(4) substrate to coal via the doped CeO_(2).Furthermore,the solid products formed from the mixed CaSO_(4)-CeO_(2) OC with the selected coal were collected and analyzed.Especially,evolution and redistribution of the sulfur species of different forms were focused.At the latter reaction stage of YN reaction with the CaSO_(4)-CeO_(2) mixed OC,the SO_(2) emitted from the side reactions of CaSO_(4) was greatly diminished and the doped CeO_(2) was proven effective to directionally fix the SO_(2) released to turn into different solid sulfur compounds,which were determined as Ce_(2)O_(2)S,Ce_(2)S_(3) and Ce_(2)(SO_(4))_(3)·5H_(2)O and formed through the different pathways.In addition,good regeneration of the reduced CaSO_(4)-CeO_(2) mixed OC could be reached in spite of the unavoidable interaction between the included minerals in coal and the reduced mixed OC.Overall,the combined template method-made CaSO_(4)-CeO_(2) mixed OC reported herein was not only endowed with enhanced reactivity for coal conversion,but also owned the potential to directionally fix the gaseous sulfur emission,which is quite applicable as OC for simultaneous decarbonatization and desulfurization in the real CLC process.展开更多
Early diagnosis of osteoarthritis(OA)is critical for effective cartilage repair.However,lack of blood vessels in articular cartilage poses a barrier to contrast agent delivery and subsequent diagnostic imaging.To addr...Early diagnosis of osteoarthritis(OA)is critical for effective cartilage repair.However,lack of blood vessels in articular cartilage poses a barrier to contrast agent delivery and subsequent diagnostic imaging.To address this challenge,we proposed to develop ultra-small superparamagnetic iron oxide nanoparticles(SPIONs,4 nm)that can penetrate into the matrix of articular cartilage,and further modified with the peptide ligand WYRGRL(particle size,5.9 nm),which allows SPIONs to bind to type II collagen in the cartilage matrix and increase the retention of probes.Type II collagen in the cartilage matrix is gradually lost with the progression of OA,consequently,the binding of peptide-modified ultra-small SPIONs to type II collagen in the OA cartilage matrix is less,thus presenting different magnetic resonance(MR)signals in OA group from the normal ones.By introducing the AND logical operation,damaged cartilage can be differentiated from the surrounding normal tissue on T1 and T2 AND logical map of MR images,and this was also verified in histology studies.Overall,this work provides an effective strategy for delivering nanosized imaging agents to articular cartilage,which could potentially be used to diagnosis joint-related diseases such as osteoarthritis.展开更多
Precise diagnosis of lymph node metastasis is important for therapeutic regimen planning,prognosis analysis and probably better outcomes for cancer patients.In this work,^(68)Ga-labeled amphiphilic alternating copolym...Precise diagnosis of lymph node metastasis is important for therapeutic regimen planning,prognosis analysis and probably better outcomes for cancer patients.In this work,^(68)Ga-labeled amphiphilic alternating copolymers nanoparticles with different rigid ligands were synthesized as positron emission tomography(PET)probes for lymph node metastasis imaging.The labeling efficiency and stability of nanoparticles was improved with increased rigidity of coordination unit.PU(^(68)Ga-L-MDI-PEG)nanoparticles(PU(^(68)Ga-L-MDI-PEG)NPs)with the strongest rigidity of coordination unit exhibited the lowest critical micelle concentration,the best^(68)Ga labeling efficiency and stability.During in vivo lymph node metastasis imaging,PU(^(68)Ga-L-MDI-PEG)NPs led to different accumulations in normal lymph nodes(N-LN)and tumor metastasized sentinel lymph nodes(T-SLN),which resulted in different PET signal presentation,making it feasible to differentiate N-LN from T-SLN.In comparison,small molecule probe^(68)GaL had poor lymph node accumulation,not only making it difficult to find lymph nodes on PET/computed tomography scan,but also tough to distinguish N-LN from metastatic ones.Overall,this work provides a reference for design of^(68)Ga labeled polymeric nanoparticles with high chelation efficiency and stability,as sensitive PET probes for lymph node imaging.展开更多
The localization and differential diagnosis of the sentinel lymph nodes(SLNs)are particularly important for tumor staging,surgical planning and prognosis.In this work,kinetically inert manganese(II)-based hybrid micel...The localization and differential diagnosis of the sentinel lymph nodes(SLNs)are particularly important for tumor staging,surgical planning and prognosis.In this work,kinetically inert manganese(II)-based hybrid micellar complexes(MnCs)for magnetic resonance imaging(MRI)were developed using an amphiphilic manganese-based chelate(C18-PhDTA-Mn)with reliable kinetic stability and self-assembled with a series of amphiphilic PEG-C18 polymers of different molecular weights(C18En,n=10,20,50).Among them,the probes composed by 1:10 mass ratio of manganese chelate/C18En had slightly different hydrodynamic particle sizes with similar surface charges as well as considerable relaxivities(∼13 mM^(−1)s^(−1)at 1.5 T).In vivo lymph node imaging in mice revealed that the MnC MnC-20 formed by C18E20 with C18-PhDTA-Mn at a hydrodynamic particle size of 5.5 nm had significant signal intensity brightening effect and shortened T1 relaxation time.At an imaging probe dosage of 125μg Mn/kg,lymph nodes still had significant signal enhancement in 2 h,while there is no obvious signal intensity alteration in non-lymphoid regions.In 4T1 tumor metastatic mice model,SLNs showed less signal enhancement and smaller T1 relaxation time variation at 30 min post-injection,when compared with normal lymph nodes.This was favorable to differentiate normal lymph nodes from SLN under a 3.0-T clinical MRI scanner.In conclusion,the strategy of developing manganese-based MR nanoprobes was useful in lymph node imaging.展开更多
Osteoporosis is a skeletal disorder resulted in significant structural and functional changes,arousing a wide concern for the high prevalence and cost.Imbalance between osteoclastogenesis and osteogenesis have been ve...Osteoporosis is a skeletal disorder resulted in significant structural and functional changes,arousing a wide concern for the high prevalence and cost.Imbalance between osteoclastogenesis and osteogenesis have been verified as a main pathology etiology and considered an efficient therapy target in both clinical and pre-clinical studies.In recent years,inorganic nanomaterials have shown provable activities on osteoclastogenesis inhibition and osteogenesis promotion,respectively.Hence,in this study,a class of hydroxyapatite coated superparamagnetic iron oxide nanoparticles(SPIO@HA)were developed with a coreshell structure for targeting both osteoclastogenesis and osteogenesis.The optimal ratio of SPIO@15HA(Fe/Ca¼1:15,mol/mol)was screened to obtain dual function for inducing both bone formation and preventing bone resorption.The obtained nanocomposites significantly prevented the bone loss of ovariectomized(OVX)mice and increased bone mineral density(BMD)by 9.4%,exhibiting high bone accumulation in magnetic resonance imaging evaluation and reasonable biosafety profile.The mechanism study revealed that SPIO@15HA can suppress bone marrow monocyte derived osteoclast differentiation through TRAF6p62CYLD signaling complex regulation.Meanwhile,it could activate MSC osteogenic differentiation by TGF-b,PI3K-AKT and calcium signaling pathway regulation.Moreover,incubation of SPIO@15HA with MSC resulted in several cytokines overexpression such as osteoprotegerin(OPG),CSF2,CCL2 etc.,which are responsible for maintaining the bone remodeling balance.The dual function of as-prepared SPIO@15HA may find a new way for designing of inorganic components containing core/shell nanomaterials for osteoporosis treatment.展开更多
The T_(1)-T_(2) dual-mode probes for magnetic resonance imaging(MRI)can non-invasively acquire comprehensive information of different tissues or generate self-complementary information of the same tissue at the same t...The T_(1)-T_(2) dual-mode probes for magnetic resonance imaging(MRI)can non-invasively acquire comprehensive information of different tissues or generate self-complementary information of the same tissue at the same time,making MRI a more flexible imaging modality for complicated applications.In this work,three Gadolinium-diethylene-triaminepentaaceticacid(Gd-DTPA)complex conjugated superparamagnetic iron oxide(SPIO)nanoparticles with different Gd/Fe molar ratio(0.94,1.28 and 1.67)were prepared as T_(1)-T_(2) dual-mode MRI probes,named as SPIO@PEG-GdDTPA0.94,SPIO@PEGGdDTPA1.28 and SPIO@PEG-GdDTPA1.67,respectively.All SPIO@PEG-GdDTPA nanocomposites with 8 nm spherical SPIO nanocrystals showed good Gd3þchelate stability.SPIO@PEG-GdDTPA0.94 nanocomposites with lowest Gd/Fe molar ratio show no cytotoxicity to Raw 264.7 cells as compared to SPIO@PEG-GdDTPA1.28 and SPIO@PEG-GdDTPA1.67.SPIO@PEG-GdDTPA0.94 nanocomposites with r1(8.4mM^(-1)s^(-1)),r2(83.2mM^(-1)s^(-1))and relatively ideal r2/r1 ratio(9.9)were selected for T_(1)-T_(2) dual-mode MRI of blood vessels and liver tissue in vivo.Good contrast images were obtained for both cardiovascular system and liver in animal studies under a clinical 3 T scanner.Importantly,one can get high-quality contrast-enhanced blood vessel images within the first 2 h after contrast agent administration and acquire liver tissue anatomy information up to 24 h.Overall,the strategy of one shot of the dual mode MRI agent could bring numerous benefits not only for patients but also to the radiologists and clinicians,e.g.saving time,lowering side effects and collecting data of different organs sequentially.展开更多
Magnetic resonance(MR)/optical dual-mode imaging with high sensitivity and high tissue resolution have attracted many attentions in biomedical applications.To avert aggregation-caused quenching of conventional fluores...Magnetic resonance(MR)/optical dual-mode imaging with high sensitivity and high tissue resolution have attracted many attentions in biomedical applications.To avert aggregation-caused quenching of conventional fluorescence chromophores,an aggregation-induced emission molecule tetraphenylethylene(TPE)-conjugated amphiphilic polyethylenimine(PEI)covered superparamagnetic iron oxide(Alkyl-PEI-LAC-TPE/SPIO nanocomposites)was prepared as an MR/optical dual-mode probe.Alkyl-PEI-LAC-TPE/SPIO nanocomposites exhibited good fluorescence property and presented higher T2 relaxivity(352 Fe mM1s1)than a commercial contrast agent Feridex(120 Fe mM1s1)at 1.5 T.The alkylation degree of Alkyl-PEI-LAC-TPE effects the restriction of intramolecular rotation process of TPE.Reducing alkane chain grafting ratio aggravated the stack of TPE,increasing the fluorescence lifetime of Alkyl-PEI-LAC-TPE/SPIO nanocomposites.Alkyl-PEI-LAC-TPE/SPIO nanocomposites can effectively labelled HeLa cells and resulted in high fluorescence intensity and excellent MR imaging sensitivity.As an MR/optical imaging probe,Alkyl-PEI-LAC-TPE/SPIO nanocomposites may be used in biomedical imaging for certain applications.展开更多
Macrophage autophagy is a common biological response triggered by nanomaterials,which is closely related to the regulation of inflammation.Superparamagnetic iron oxide(SPIO)nanoparticles have been used for study of au...Macrophage autophagy is a common biological response triggered by nanomaterials,which is closely related to the regulation of inflammation.Superparamagnetic iron oxide(SPIO)nanoparticles have been used for study of autophagy response due to their broad biomedical applications.However,few reports have focused on how to regulate the macrophage autophagy response induced by SPIO nanoparticles.In this study,SPIO nanoparticles grafted with carboxyl groups were synthesized and for the comparison of macrophage autophagy with unmodified nanoparticles.The study on the correlation between autophagy and inflammation induced by the two kinds of SPIO nanoparticles was also included,and the one that grafted with carboxyl groups shows a reduction of autophagy and thereby caused a milder inflammatory response.We proposed that the increased amount of albumin adsorption on the surface of carboxylated SPIO nanoparticles,a protein previously proven to attenuate autophagy,can be considered an important reason for reducing autophagy and inflammation.In general,the carboxyl modification of SPIO nanoparticles has been demonstrated to reduce inflammation by inhibiting macrophage autophagy,which may provide some insights for the design of nanomaterials in the future.展开更多
基金supported by the National Natural Science Founda-tion of China(Nos.51776073,51906083)Key Research&Develop-ment program of Henan Province(No.162102210233)+1 种基金North China University of Water Resources and Electric Power Innovative Project(Nos.2019XA014,2019XB058)Scientific Research&Development Project of Ji-Yan Energy Science and Technology Research Institute(NKY2020-05).
文摘Calcium sulfate(CaSO_(4))has been verified as a promising oxygen carrier(OC)in the chemical looping combustion(CLC)for its high oxygen capacity,abundant reserve and low cost,but its low reactivity and deleterious sulfur species emission from the side reactions of CaSO_(4) should be well considered for its wide application in CLC.In order to promote the reactivity of CaSO_(4) and increase its potential to inhibit the gaseous sulfur emission,a CeO_(2)-enhanced CaSO_(4) OC mixed OC of core–shell structure was prepared using the combined template synthesis method.Reaction characteristics of the prepared CaSO_(4)-CeO_(2) mixed OC with a typical lignite was first conducted and systematically investigated,and an improved reactivity of the prepared CaSO_(4)-CeO_(2) mixed OC was demonstrated than its single component CaSO_(4) or CeO_(2) due to the fast transfer and exchange of oxygen from the CaSO_(4) substrate to coal via the doped CeO_(2).Furthermore,the solid products formed from the mixed CaSO_(4)-CeO_(2) OC with the selected coal were collected and analyzed.Especially,evolution and redistribution of the sulfur species of different forms were focused.At the latter reaction stage of YN reaction with the CaSO_(4)-CeO_(2) mixed OC,the SO_(2) emitted from the side reactions of CaSO_(4) was greatly diminished and the doped CeO_(2) was proven effective to directionally fix the SO_(2) released to turn into different solid sulfur compounds,which were determined as Ce_(2)O_(2)S,Ce_(2)S_(3) and Ce_(2)(SO_(4))_(3)·5H_(2)O and formed through the different pathways.In addition,good regeneration of the reduced CaSO_(4)-CeO_(2) mixed OC could be reached in spite of the unavoidable interaction between the included minerals in coal and the reduced mixed OC.Overall,the combined template method-made CaSO_(4)-CeO_(2) mixed OC reported herein was not only endowed with enhanced reactivity for coal conversion,but also owned the potential to directionally fix the gaseous sulfur emission,which is quite applicable as OC for simultaneous decarbonatization and desulfurization in the real CLC process.
基金supported by the National Natural Science Foundation of China(NSFC,No.52073192,81601490)the Innovative Research Groups of the National Natural Science Foundation of China(81621003).
文摘Early diagnosis of osteoarthritis(OA)is critical for effective cartilage repair.However,lack of blood vessels in articular cartilage poses a barrier to contrast agent delivery and subsequent diagnostic imaging.To address this challenge,we proposed to develop ultra-small superparamagnetic iron oxide nanoparticles(SPIONs,4 nm)that can penetrate into the matrix of articular cartilage,and further modified with the peptide ligand WYRGRL(particle size,5.9 nm),which allows SPIONs to bind to type II collagen in the cartilage matrix and increase the retention of probes.Type II collagen in the cartilage matrix is gradually lost with the progression of OA,consequently,the binding of peptide-modified ultra-small SPIONs to type II collagen in the OA cartilage matrix is less,thus presenting different magnetic resonance(MR)signals in OA group from the normal ones.By introducing the AND logical operation,damaged cartilage can be differentiated from the surrounding normal tissue on T1 and T2 AND logical map of MR images,and this was also verified in histology studies.Overall,this work provides an effective strategy for delivering nanosized imaging agents to articular cartilage,which could potentially be used to diagnosis joint-related diseases such as osteoarthritis.
基金supported by National Natural Science Foundation of China(NSFC,Nos.51903174 and 52073192)Innovative Research Groups of the National Natural Science Foundation of China(81621003).
文摘Precise diagnosis of lymph node metastasis is important for therapeutic regimen planning,prognosis analysis and probably better outcomes for cancer patients.In this work,^(68)Ga-labeled amphiphilic alternating copolymers nanoparticles with different rigid ligands were synthesized as positron emission tomography(PET)probes for lymph node metastasis imaging.The labeling efficiency and stability of nanoparticles was improved with increased rigidity of coordination unit.PU(^(68)Ga-L-MDI-PEG)nanoparticles(PU(^(68)Ga-L-MDI-PEG)NPs)with the strongest rigidity of coordination unit exhibited the lowest critical micelle concentration,the best^(68)Ga labeling efficiency and stability.During in vivo lymph node metastasis imaging,PU(^(68)Ga-L-MDI-PEG)NPs led to different accumulations in normal lymph nodes(N-LN)and tumor metastasized sentinel lymph nodes(T-SLN),which resulted in different PET signal presentation,making it feasible to differentiate N-LN from T-SLN.In comparison,small molecule probe^(68)GaL had poor lymph node accumulation,not only making it difficult to find lymph nodes on PET/computed tomography scan,but also tough to distinguish N-LN from metastatic ones.Overall,this work provides a reference for design of^(68)Ga labeled polymeric nanoparticles with high chelation efficiency and stability,as sensitive PET probes for lymph node imaging.
基金supported by the National Natural Science Foundation of China(NSFC,52073192)the Innovative Research Groups of the National Natural Science Foundation of China(81621003).
文摘The localization and differential diagnosis of the sentinel lymph nodes(SLNs)are particularly important for tumor staging,surgical planning and prognosis.In this work,kinetically inert manganese(II)-based hybrid micellar complexes(MnCs)for magnetic resonance imaging(MRI)were developed using an amphiphilic manganese-based chelate(C18-PhDTA-Mn)with reliable kinetic stability and self-assembled with a series of amphiphilic PEG-C18 polymers of different molecular weights(C18En,n=10,20,50).Among them,the probes composed by 1:10 mass ratio of manganese chelate/C18En had slightly different hydrodynamic particle sizes with similar surface charges as well as considerable relaxivities(∼13 mM^(−1)s^(−1)at 1.5 T).In vivo lymph node imaging in mice revealed that the MnC MnC-20 formed by C18E20 with C18-PhDTA-Mn at a hydrodynamic particle size of 5.5 nm had significant signal intensity brightening effect and shortened T1 relaxation time.At an imaging probe dosage of 125μg Mn/kg,lymph nodes still had significant signal enhancement in 2 h,while there is no obvious signal intensity alteration in non-lymphoid regions.In 4T1 tumor metastatic mice model,SLNs showed less signal enhancement and smaller T1 relaxation time variation at 30 min post-injection,when compared with normal lymph nodes.This was favorable to differentiate normal lymph nodes from SLN under a 3.0-T clinical MRI scanner.In conclusion,the strategy of developing manganese-based MR nanoprobes was useful in lymph node imaging.
基金supported by National Natural Science Foundation of China(NSFC,Nos 51903174 and 52073192)Innovative Research Groups of the National Natural Science Foundation of China(81621003)+1 种基金Chengdu Science and Technology Program(2019-YF05-00318-SN)the Sichuan University Postdoctoral Interdisciplinary Innovation Startup Foundation and the Fundamental Research Funds for Central Universities(2021SCU12070).
文摘Osteoporosis is a skeletal disorder resulted in significant structural and functional changes,arousing a wide concern for the high prevalence and cost.Imbalance between osteoclastogenesis and osteogenesis have been verified as a main pathology etiology and considered an efficient therapy target in both clinical and pre-clinical studies.In recent years,inorganic nanomaterials have shown provable activities on osteoclastogenesis inhibition and osteogenesis promotion,respectively.Hence,in this study,a class of hydroxyapatite coated superparamagnetic iron oxide nanoparticles(SPIO@HA)were developed with a coreshell structure for targeting both osteoclastogenesis and osteogenesis.The optimal ratio of SPIO@15HA(Fe/Ca¼1:15,mol/mol)was screened to obtain dual function for inducing both bone formation and preventing bone resorption.The obtained nanocomposites significantly prevented the bone loss of ovariectomized(OVX)mice and increased bone mineral density(BMD)by 9.4%,exhibiting high bone accumulation in magnetic resonance imaging evaluation and reasonable biosafety profile.The mechanism study revealed that SPIO@15HA can suppress bone marrow monocyte derived osteoclast differentiation through TRAF6p62CYLD signaling complex regulation.Meanwhile,it could activate MSC osteogenic differentiation by TGF-b,PI3K-AKT and calcium signaling pathway regulation.Moreover,incubation of SPIO@15HA with MSC resulted in several cytokines overexpression such as osteoprotegerin(OPG),CSF2,CCL2 etc.,which are responsible for maintaining the bone remodeling balance.The dual function of as-prepared SPIO@15HA may find a new way for designing of inorganic components containing core/shell nanomaterials for osteoporosis treatment.
基金supported by National Natural Science Foundation of China(NSFC,No.51903174 and 52073192)Innovative Research Groups of the National Natural Science Foundation of China(81621003).
文摘The T_(1)-T_(2) dual-mode probes for magnetic resonance imaging(MRI)can non-invasively acquire comprehensive information of different tissues or generate self-complementary information of the same tissue at the same time,making MRI a more flexible imaging modality for complicated applications.In this work,three Gadolinium-diethylene-triaminepentaaceticacid(Gd-DTPA)complex conjugated superparamagnetic iron oxide(SPIO)nanoparticles with different Gd/Fe molar ratio(0.94,1.28 and 1.67)were prepared as T_(1)-T_(2) dual-mode MRI probes,named as SPIO@PEG-GdDTPA0.94,SPIO@PEGGdDTPA1.28 and SPIO@PEG-GdDTPA1.67,respectively.All SPIO@PEG-GdDTPA nanocomposites with 8 nm spherical SPIO nanocrystals showed good Gd3þchelate stability.SPIO@PEG-GdDTPA0.94 nanocomposites with lowest Gd/Fe molar ratio show no cytotoxicity to Raw 264.7 cells as compared to SPIO@PEG-GdDTPA1.28 and SPIO@PEG-GdDTPA1.67.SPIO@PEG-GdDTPA0.94 nanocomposites with r1(8.4mM^(-1)s^(-1)),r2(83.2mM^(-1)s^(-1))and relatively ideal r2/r1 ratio(9.9)were selected for T_(1)-T_(2) dual-mode MRI of blood vessels and liver tissue in vivo.Good contrast images were obtained for both cardiovascular system and liver in animal studies under a clinical 3 T scanner.Importantly,one can get high-quality contrast-enhanced blood vessel images within the first 2 h after contrast agent administration and acquire liver tissue anatomy information up to 24 h.Overall,the strategy of one shot of the dual mode MRI agent could bring numerous benefits not only for patients but also to the radiologists and clinicians,e.g.saving time,lowering side effects and collecting data of different organs sequentially.
基金This work was financially supported by the National Natural Science Foundation of China(NSFC,No.51903174 and 52073192)Innovative Research Groups of the National Natural Science Foundation of China(81621003)+1 种基金Chengdu Science and Technology Program(2019-YF05-00318-SN)the Fundamental Research Funds for Central Universities(2021SCU12070).
文摘Magnetic resonance(MR)/optical dual-mode imaging with high sensitivity and high tissue resolution have attracted many attentions in biomedical applications.To avert aggregation-caused quenching of conventional fluorescence chromophores,an aggregation-induced emission molecule tetraphenylethylene(TPE)-conjugated amphiphilic polyethylenimine(PEI)covered superparamagnetic iron oxide(Alkyl-PEI-LAC-TPE/SPIO nanocomposites)was prepared as an MR/optical dual-mode probe.Alkyl-PEI-LAC-TPE/SPIO nanocomposites exhibited good fluorescence property and presented higher T2 relaxivity(352 Fe mM1s1)than a commercial contrast agent Feridex(120 Fe mM1s1)at 1.5 T.The alkylation degree of Alkyl-PEI-LAC-TPE effects the restriction of intramolecular rotation process of TPE.Reducing alkane chain grafting ratio aggravated the stack of TPE,increasing the fluorescence lifetime of Alkyl-PEI-LAC-TPE/SPIO nanocomposites.Alkyl-PEI-LAC-TPE/SPIO nanocomposites can effectively labelled HeLa cells and resulted in high fluorescence intensity and excellent MR imaging sensitivity.As an MR/optical imaging probe,Alkyl-PEI-LAC-TPE/SPIO nanocomposites may be used in biomedical imaging for certain applications.
基金supported by the National Natural Science Foundation of China(NSFC,No.51903174,52073192)the Innovative Research Groups of the National Natural Science Foundation of China(81621003).
文摘Macrophage autophagy is a common biological response triggered by nanomaterials,which is closely related to the regulation of inflammation.Superparamagnetic iron oxide(SPIO)nanoparticles have been used for study of autophagy response due to their broad biomedical applications.However,few reports have focused on how to regulate the macrophage autophagy response induced by SPIO nanoparticles.In this study,SPIO nanoparticles grafted with carboxyl groups were synthesized and for the comparison of macrophage autophagy with unmodified nanoparticles.The study on the correlation between autophagy and inflammation induced by the two kinds of SPIO nanoparticles was also included,and the one that grafted with carboxyl groups shows a reduction of autophagy and thereby caused a milder inflammatory response.We proposed that the increased amount of albumin adsorption on the surface of carboxylated SPIO nanoparticles,a protein previously proven to attenuate autophagy,can be considered an important reason for reducing autophagy and inflammation.In general,the carboxyl modification of SPIO nanoparticles has been demonstrated to reduce inflammation by inhibiting macrophage autophagy,which may provide some insights for the design of nanomaterials in the future.
