The complexity of biological samples determines that the detection of a single biomolecule is unable to satisfy actual needs. Moreover, the "false positives" results caused by a single biomolecule detections...The complexity of biological samples determines that the detection of a single biomolecule is unable to satisfy actual needs. Moreover, the "false positives" results caused by a single biomolecule detections easily leads to erroneous clinical diagnosis and treatment. Thus, it is important for the homogenous quantification of multiple biomolecules in not only basic research but also practical application. As a consequent, a large number of literatures have been exploited to monitor multiple biomolecules in homogenous solution, enabling facilitating the development of the disease diagnosis, treatment as well as drug discovery. One-dimensional nanomaterials and two-dimensional nanomaterials have special physical and chemical properties, such as good electrochemical properties, stable structure, large specific surface area, and biocompatibility, which are widely used in electrochemical and fluorescent detection of biomolecules. This tutorial review highlights the recent development for the detection of multiple biomolecules by using nanomaterials including one-dimensional materials(1DMs) as well as twodimensional materials(2DMs).展开更多
Functional nucleic acids(FNAs)-based biosensors have shown great potential in heavy metal ions detection due to their low-cost and easy to operate merits. However, in most FNAs based fluorescence probes, the ingenious...Functional nucleic acids(FNAs)-based biosensors have shown great potential in heavy metal ions detection due to their low-cost and easy to operate merits. However, in most FNAs based fluorescence probes, the ingenious designs of double-labeled(fluorophore and quencher group) DNA sequence, not only bring the annoyance of organic synthesis, but also restrict its use as a robust biosensor in practical duties. In this paper, we design a simple AIEgens functional nucleic acids(AFNAs) probe which consists of only fluorogen but no quencher group. With the help of duplex-specific nuclease(DSN) enzyme based target recycling, high fluorescence signal and superior sensitivity towards Hg^(2+) are achieved. This robust assay allows for sensitive and selective detection of Hg^(2+) in real water samples and mapping of intracellular Hg^(2+), without double-labeling of oligonucleotide with a dye-quencher pair, nor the multiple assay steps.展开更多
The fabrication of sensitive sensors with high selectivity is highly desirable for the detection of some important biomarkers,such as nucleic acids,proteins,small molecules and ions.DNA hybridization chain reaction(HC...The fabrication of sensitive sensors with high selectivity is highly desirable for the detection of some important biomarkers,such as nucleic acids,proteins,small molecules and ions.DNA hybridization chain reaction(HCR) and DNA supersandwich self-assembly(SSA) are two prevalent enzyme-free signal amplification strategies to improve sensitivity of the sensors.In this review,we firstly describe the characteristics about DNA HCR and DNA SSA,and then summarize the advances in the one-dimensional DNA nanostructures assisted by HCR and SSA.This review has been divided into three parts according to the two signal amplification methods and highlights recent progress in these two strategies to improve the detection sensitivity of proteins,nucleic acids,small molecules and ions.展开更多
It is important for the determination of biologically and/or environmentally relevant species by utilization of fluorescent probes. Conventional fluorescent probes are subjected to the influence of aggregation-caused ...It is important for the determination of biologically and/or environmentally relevant species by utilization of fluorescent probes. Conventional fluorescent probes are subjected to the influence of aggregation-caused quenching that is limiting their application due to low selectivity as well as photobleaching. Additionally, quencher pairs are usually introduced in the design of these probes, which lead to the complex synthetic procedure. A novel class of fluorogens with aggregation-induced emission (AIE) characteristic provide a solution to address the dilemma. By taking advantage of the unique characteristic of AIE fluorogens, specific turn-on probes have been developed via combination with recognition components, exhibiting low background, good selectivity and outstanding photostability. This review focuses on the development of fluorescent probes with AIE characteristics via the bond cleavage as well as formation strategy.展开更多
Recently,the issue of cancer has attracted extensive attention.Early diagnosis and timely therapy are important for cancer treatment.And lots of advanced fluorescent probes have been applied to cancer theranostics.How...Recently,the issue of cancer has attracted extensive attention.Early diagnosis and timely therapy are important for cancer treatment.And lots of advanced fluorescent probes have been applied to cancer theranostics.However,the further development of these probes is limited by the disadvantages of poor targeting,weak sensitivity and photobleaching.Fortunately,the emergence of biomolecule-conjugated fluorescent probes with aggregationinduced emission properties has taken innovative impetus to the cancer theranostics.This review summarizes the rational fabrication and biomedical applications of biomolecule-conjugated A1E luminogens(AIEgens)based on"click reaction"over the past decade.In the meantime,the challenges of biomolecule-conjugated AIEgens in the field of biomedicine are also discussed.展开更多
Monitoring telomerase activity with high sensitive and reliable is of great importance to cancer analysis. In this paper, we report a sensitive and facile method to detect telomerase activity using AIEgens mod- ified ...Monitoring telomerase activity with high sensitive and reliable is of great importance to cancer analysis. In this paper, we report a sensitive and facile method to detect telomerase activity using AIEgens mod- ified probe （TPE-Py-DNA） as a fluorescence reporter and exonuclease llI （Exo lIl） as a signal amplifier. With the aid of telomerase, repeat units （TrAGGG）n are extended from the end of template substrate oligonucleotides （TS primer） that form duplex DNAs with TPE-Py-DNA. Then, Exo llI catalyzes the diges- tion of duplex DNAs, liberating elongation product and releasing hydrophobic TPE-Py. The released hydrophobic TPE-Py aggregate together and produce a telomerase-activity-related fluorescence signal. The liberated product hybridizes with another TPE-Py-DNA probe, starting the second cycle. Finally, we obtain the target-to-signal amplification ratio of 1 ：N2. This strategy exhibits good performance for detecting clinical urine samples （distinguishing 15 cancer patients＇ samples from 8 healthy ones） and checking intracellular telomerase activity （differentiating cell lines including HeLa, MDA-MB-231, MCF-7, A375, HLF and MRC-5 from the cells pretreated with telomerase-related drug）, which shows its potential in clinical diagnosis as well as therapeutic monitoring of cancer.展开更多
Cancers and chronic diseases have always been global health problems. The occurrence and development of such diseases are closely related to the abnormalities of proteins, nucleic acids, ions or small molecules in the...Cancers and chronic diseases have always been global health problems. The occurrence and development of such diseases are closely related to the abnormalities of proteins, nucleic acids, ions or small molecules in the body. Nowadays, nanopores/nanochannels have emerged as a powerful platform for detecting these biomolecules based on the electrical signal variation caused by biomolecules passing. However, detection relied on the electrical signal easily suffered from the clogging defects, low throughput, and strong background signals. Fortunately, the emergence of designing nanopores/nanochannels based on electrical and optical dual signal response has brought innovative impetus to biological detection, which can also identify the chemical compositions and conformations of the biomolecules. In this review, we summarize the reasonable preparation of nanopores/nanochannels with electrical and optical dual signal response and their application in biological detection. According to different biomolecules, we divide the targets into four types, including nucleic acids, small molecules, ions and proteins. In each section, the design of representative examples and the principle of dual signal generation are introduced and discussed. Finally, the prospects and challenges of nanopores/nanochannels based on electrical and optical dual signal response are also discussed.展开更多
Robust photosensitizers with strong red/NIR fluorescence, efficient reactive oxygen species(ROS) generation and high photostability are highly desired for photodynamic therapy(PDT). Herein, three novel red conjugated ...Robust photosensitizers with strong red/NIR fluorescence, efficient reactive oxygen species(ROS) generation and high photostability are highly desired for photodynamic therapy(PDT). Herein, three novel red conjugated polyelectrolytes(CPEs) with tetraphenylethene and 2,1,3-benzothiadiazole on the main chains and triphenylphosphonium on the side chains are developed.These CPEs display apparent aggregation-induced emission feature and high fluorescence quantum yields in the aggregated state. They can target lysosome in He La cells for fluorescence bioimaging. By virtue of the good retention effect and high photostability, these CPEs show ultralong-term tracing performance of subcutaneous tumors, and the tumor site can still be visualized for 20 days after injection. Owing to their good biocompatibility and strong ROS generation ability, the image-guided PDT based on these CPEs can effectively inhibit the growth of subcutaneous tumor and significantly prolong the survival of tumor bearing mice. The H&E and IHC staining reveal that the PDT of these CPEs depress the proliferation of tumor cells, and promote apoptosis and necrosis process. These new CPEs may be employed both as fluorescent probes for in vitro and in vivo long-term tracing and as photosensitizers for image-guided PDT of tumors.展开更多
Theranostic systems by integrating the tumor imaging and tumor therapeutic capabilities into one platform have attracted numerous attentions from worldwide researchers.Despite the great developments,their clinical app...Theranostic systems by integrating the tumor imaging and tumor therapeutic capabilities into one platform have attracted numerous attentions from worldwide researchers.Despite the great developments,their clinical application is still in the nascent stage,owing to the unsatisfied imaging quality and limited therapeutic efficacy.Fortunately,the emerging of aggregation-induced emission(AIE)molecules with unique fluorescence property offers an opportunity to solve the imaging problem.Besides,further utilizing the tumor microenvironments and external triggers to design the stimuli-responsive imaging-guided therapy could enhance the therapeutic efficacy and reduce the side effects.In this review,the advancements in stimuli-responsive theranostic systems with AIE characteristics are summarized.Theranostic systems are first classified according to their treatment modes,and then subdivided based on various stimuli,including pH,redox,enzyme,and light.In each section,the design strategies and application examples are introduced.At last,the current state of the art,limitations,as well as prospects are also discussed.展开更多
The capability to image, as well as control and manipulate single molecules such as nucleic acids(DNA or RNA) can greatly enrich our knowledge of the roles of individual biomolecules in cellular processes and their be...The capability to image, as well as control and manipulate single molecules such as nucleic acids(DNA or RNA) can greatly enrich our knowledge of the roles of individual biomolecules in cellular processes and their behavior in native environments. Here we summarize the recent advances of single nucleic acid imaging based on optical observation and force manipulation. We start by discussing the superiority of single molecule image, the central roles nucleic acids play in biosystems, and the significance of single molecule image towards nucleic acids. We then list a series of representative examples in brief to illustrate how nucleic acid of various morphologies has been imaged from different aspects, and what can be learned from such characterizations. Finally,concluding remarks on parts of which should be improved and outlook are outlined.展开更多
The cell membrane is a vital barrier that protects the cell from external damage and is involved in many biochemical processes.Thus,it is of great significance to label the cell membrane to explore its function.Howeve...The cell membrane is a vital barrier that protects the cell from external damage and is involved in many biochemical processes.Thus,it is of great significance to label the cell membrane to explore its function.However,due to its complex and dynamic nature,precise and firm cell membrane labeling simultaneously is still a challenge.Herein,we report the fabrication of a peptide-conjugated aggregationinduced emission fluorogen(AIEgen),RTP,consisting of three main components:(1)An integrin-targeting peptide(RGD,R),which could bind specifically to integrinαvβ3 on cell membranes through ligand–receptor interaction.(2)An AIE-active tetraphenylethene derivative(T-MY,T)for fluorescent imaging.(3)Palmitic acid-modified peptide(Pal-RRRR,P),in which Pal isinserted into the lipid on the cellmembrane by hydrophobic interaction,and RRRR interacted with the negatively charged cell membrane components(proteins and lipids)through electrostatic forces.RTP could precisely label tumor cells with high integrinαvβ3 expression andfirmly trace the cellmembrane for up to 4 h;it also has a strong resistance to photobleaching.Moreover,RTP achieved in vivo tumor-specific imaging via cell membrane labeling.Thereby,utilizing multiple weak interactions between the fluorescent probe and the cell membrane provided a new strategy for precise and firm imaging of the cell membrane simultaneously.展开更多
Precisely analyzing the target materials in living cells can reveal the essence and mystery of life at a deeper level,which will provide reliable theoretical basis for the occurrence,development,treatment and prognosi...Precisely analyzing the target materials in living cells can reveal the essence and mystery of life at a deeper level,which will provide reliable theoretical basis for the occurrence,development,treatment and prognosis of major diseases.However,because living cells are in the dynamic process of metabolism,there are several challenges existed in accurate analysis,including subcellular compartment heterogeneity,plasma membrane interface barrier,and cell cycle regulation.In this regard,our group has designed and synthesized a series of multifunctional aggregates by mainly integrating the peptide elements,nucleic acid elements and aggregation elements to overcome the barriers.This article summarizes the latest developments of multifunctional aggregates for precise cell analysis by our group,and systematically introduces them according to different design concepts and targeting dimensions,such as space,efficiency as well as time.We hope this work could contribute to analyzing the biomarkers in cells through constructing the multifunctional aggregates,understanding the operation mechanism of cells,finally inspiring technology breakthroughs in biomedical fields.展开更多
Diseases often come from a cell or even a molecule misperforms its function.Obtaining fluctuation of nucleic acids,proteins,glycans and other biomolecules is helpful to reveal the molecular mechanism of diseases and p...Diseases often come from a cell or even a molecule misperforms its function.Obtaining fluctuation of nucleic acids,proteins,glycans and other biomolecules is helpful to reveal the molecular mechanism of diseases and promote the development of biology and medicine.To date,precise measurement of single molecule and single cell in the life systems has become a significant research topic of analytic chemistry,and also an important way for chemists devoting to“Healthy China Strategy”展开更多
Photochemical reaction is expected to become a promising type of green chemistry with merits of operational flexibility,excellent regioselectivity,high yield,and mild reaction condition.Recently,aggregation-induced em...Photochemical reaction is expected to become a promising type of green chemistry with merits of operational flexibility,excellent regioselectivity,high yield,and mild reaction condition.Recently,aggregation-induced emission(AIE)-based fluorescent molecules with photoresponsivity have been quickly developed and employed in the biomedical field.In this Review,photoresponsive AIE materials based on the inherent photochemical reactions are highlighted according to the photochemical pathways:photoisomerization,photocyclization,photodimerization,and multiple photoreactions.Following this,their biomedical applications are summarized and discussed,including photoactivatable bioimaging,diagnosis,and therapy.Finally,the challenges and future perspectives are presented.展开更多
基金supported by the National Natural Science Foundation of China (Nos. 21525523, 21722507, 21574048, 21874121)the National Basic Research Program of China (973 Program, No. 2015CB932600)+1 种基金the National Key R&D Program of China (Nos. 2017YFA020800, 2016YFF0100800)Natural Science Foundation of Zhejiang Province of China (No. LY18B050002)
文摘The complexity of biological samples determines that the detection of a single biomolecule is unable to satisfy actual needs. Moreover, the "false positives" results caused by a single biomolecule detections easily leads to erroneous clinical diagnosis and treatment. Thus, it is important for the homogenous quantification of multiple biomolecules in not only basic research but also practical application. As a consequent, a large number of literatures have been exploited to monitor multiple biomolecules in homogenous solution, enabling facilitating the development of the disease diagnosis, treatment as well as drug discovery. One-dimensional nanomaterials and two-dimensional nanomaterials have special physical and chemical properties, such as good electrochemical properties, stable structure, large specific surface area, and biocompatibility, which are widely used in electrochemical and fluorescent detection of biomolecules. This tutorial review highlights the recent development for the detection of multiple biomolecules by using nanomaterials including one-dimensional materials(1DMs) as well as twodimensional materials(2DMs).
基金supported by the National Natural Science Foundation of China(21525523,21574048,21375042,21405054)the National Basic Research Program of China(2015CB932600,2013CB933000)+1 种基金the Special Fund for Strategic New Indus-try Development of Shenzhen,China(JCYJ20150616144425376)1000 Young Talent(to Fan Xia)
文摘Functional nucleic acids(FNAs)-based biosensors have shown great potential in heavy metal ions detection due to their low-cost and easy to operate merits. However, in most FNAs based fluorescence probes, the ingenious designs of double-labeled(fluorophore and quencher group) DNA sequence, not only bring the annoyance of organic synthesis, but also restrict its use as a robust biosensor in practical duties. In this paper, we design a simple AIEgens functional nucleic acids(AFNAs) probe which consists of only fluorogen but no quencher group. With the help of duplex-specific nuclease(DSN) enzyme based target recycling, high fluorescence signal and superior sensitivity towards Hg^(2+) are achieved. This robust assay allows for sensitive and selective detection of Hg^(2+) in real water samples and mapping of intracellular Hg^(2+), without double-labeling of oligonucleotide with a dye-quencher pair, nor the multiple assay steps.
基金supported by the National Basic Research Program of China(2015CB932600,2013CB933000)the National Natural Science Foundation of China(21505101,21375042,21405054, 21404097)1000 Young Talent(to Fan Xia) and Zhejiang Provincial Natural Science Foundation of China(LQ16B050003)
文摘The fabrication of sensitive sensors with high selectivity is highly desirable for the detection of some important biomarkers,such as nucleic acids,proteins,small molecules and ions.DNA hybridization chain reaction(HCR) and DNA supersandwich self-assembly(SSA) are two prevalent enzyme-free signal amplification strategies to improve sensitivity of the sensors.In this review,we firstly describe the characteristics about DNA HCR and DNA SSA,and then summarize the advances in the one-dimensional DNA nanostructures assisted by HCR and SSA.This review has been divided into three parts according to the two signal amplification methods and highlights recent progress in these two strategies to improve the detection sensitivity of proteins,nucleic acids,small molecules and ions.
基金supported by the National Natural Science Foundation of China(21525523,21722507,21574048 and21874121)the National Basic Research Program of China(973 Program,2015CB932600)+1 种基金the National Key R&D Program of China(2017YFA0208000 and 2016YFF0100800)the Natural Science Foundation of Zhejiang Province of China(LY18B050002)
文摘It is important for the determination of biologically and/or environmentally relevant species by utilization of fluorescent probes. Conventional fluorescent probes are subjected to the influence of aggregation-caused quenching that is limiting their application due to low selectivity as well as photobleaching. Additionally, quencher pairs are usually introduced in the design of these probes, which lead to the complex synthetic procedure. A novel class of fluorogens with aggregation-induced emission (AIE) characteristic provide a solution to address the dilemma. By taking advantage of the unique characteristic of AIE fluorogens, specific turn-on probes have been developed via combination with recognition components, exhibiting low background, good selectivity and outstanding photostability. This review focuses on the development of fluorescent probes with AIE characteristics via the bond cleavage as well as formation strategy.
基金This work is supported by the National Natural Science Foundation of China(Nos.21525523,21722507,21574048,21874121)the National Basic Research Program of China(973 Program,No.2015CB932600)+1 种基金the National Key R&D Program of China(Nos.2017YFA020800,2016YFF0100800)the Natural Science Foundation of Zhejiang Province of China(No.LY18B050002).
文摘Recently,the issue of cancer has attracted extensive attention.Early diagnosis and timely therapy are important for cancer treatment.And lots of advanced fluorescent probes have been applied to cancer theranostics.However,the further development of these probes is limited by the disadvantages of poor targeting,weak sensitivity and photobleaching.Fortunately,the emergence of biomolecule-conjugated fluorescent probes with aggregationinduced emission properties has taken innovative impetus to the cancer theranostics.This review summarizes the rational fabrication and biomedical applications of biomolecule-conjugated A1E luminogens(AIEgens)based on"click reaction"over the past decade.In the meantime,the challenges of biomolecule-conjugated AIEgens in the field of biomedicine are also discussed.
基金supported by the National Natural Science Foundation of China(21375042,21405054,21525523,21574048,and21404028)the National Basic Research Program of China(2015CB932600,2013CB933000,and 2016YFF0100800)+1 种基金the Special Fund for Strategic New Industry Development of Shenzhen,China(JCYJ20150616144425376)1000 Young Talent Program(to F.Xia)
文摘Monitoring telomerase activity with high sensitive and reliable is of great importance to cancer analysis. In this paper, we report a sensitive and facile method to detect telomerase activity using AIEgens mod- ified probe （TPE-Py-DNA） as a fluorescence reporter and exonuclease llI （Exo lIl） as a signal amplifier. With the aid of telomerase, repeat units （TrAGGG）n are extended from the end of template substrate oligonucleotides （TS primer） that form duplex DNAs with TPE-Py-DNA. Then, Exo llI catalyzes the diges- tion of duplex DNAs, liberating elongation product and releasing hydrophobic TPE-Py. The released hydrophobic TPE-Py aggregate together and produce a telomerase-activity-related fluorescence signal. The liberated product hybridizes with another TPE-Py-DNA probe, starting the second cycle. Finally, we obtain the target-to-signal amplification ratio of 1 ：N2. This strategy exhibits good performance for detecting clinical urine samples （distinguishing 15 cancer patients＇ samples from 8 healthy ones） and checking intracellular telomerase activity （differentiating cell lines including HeLa, MDA-MB-231, MCF-7, A375, HLF and MRC-5 from the cells pretreated with telomerase-related drug）, which shows its potential in clinical diagnosis as well as therapeutic monitoring of cancer.
基金financial support by the National Key R&D Program of China(2021YFA1200403,2020YFA0211200)the National Natural Science Foundation of China(22090050,21974128,21874121,52003257,22104040)+2 种基金the Joint NSFC-ISF Research Grant Program(Grant No:22161142020)the Hubei Provincial Natural Science Foundation of China(2020CFA037)the Zhejiang Provincial Natural Science Foundation of China under Grant No.LD21B050001.
文摘Cancers and chronic diseases have always been global health problems. The occurrence and development of such diseases are closely related to the abnormalities of proteins, nucleic acids, ions or small molecules in the body. Nowadays, nanopores/nanochannels have emerged as a powerful platform for detecting these biomolecules based on the electrical signal variation caused by biomolecules passing. However, detection relied on the electrical signal easily suffered from the clogging defects, low throughput, and strong background signals. Fortunately, the emergence of designing nanopores/nanochannels based on electrical and optical dual signal response has brought innovative impetus to biological detection, which can also identify the chemical compositions and conformations of the biomolecules. In this review, we summarize the reasonable preparation of nanopores/nanochannels with electrical and optical dual signal response and their application in biological detection. According to different biomolecules, we divide the targets into four types, including nucleic acids, small molecules, ions and proteins. In each section, the design of representative examples and the principle of dual signal generation are introduced and discussed. Finally, the prospects and challenges of nanopores/nanochannels based on electrical and optical dual signal response are also discussed.
基金This work was supported by the National Natural Science Foundation of China(21788102,21722507,21974128)the Natural Science Foundation of Guangdong Province(2019B030301003).
文摘Robust photosensitizers with strong red/NIR fluorescence, efficient reactive oxygen species(ROS) generation and high photostability are highly desired for photodynamic therapy(PDT). Herein, three novel red conjugated polyelectrolytes(CPEs) with tetraphenylethene and 2,1,3-benzothiadiazole on the main chains and triphenylphosphonium on the side chains are developed.These CPEs display apparent aggregation-induced emission feature and high fluorescence quantum yields in the aggregated state. They can target lysosome in He La cells for fluorescence bioimaging. By virtue of the good retention effect and high photostability, these CPEs show ultralong-term tracing performance of subcutaneous tumors, and the tumor site can still be visualized for 20 days after injection. Owing to their good biocompatibility and strong ROS generation ability, the image-guided PDT based on these CPEs can effectively inhibit the growth of subcutaneous tumor and significantly prolong the survival of tumor bearing mice. The H&E and IHC staining reveal that the PDT of these CPEs depress the proliferation of tumor cells, and promote apoptosis and necrosis process. These new CPEs may be employed both as fluorescent probes for in vitro and in vivo long-term tracing and as photosensitizers for image-guided PDT of tumors.
基金National Key R&D Program of China,Grant/Award Number:2020YFA0211200)National Natural Science Foundation of China,Grant/Award Numbers:21722507,21525523,21974128,21874121,52003257Natural Science Foundation of Hubei Province,Grant/Award Number:2019CFA043。
文摘Theranostic systems by integrating the tumor imaging and tumor therapeutic capabilities into one platform have attracted numerous attentions from worldwide researchers.Despite the great developments,their clinical application is still in the nascent stage,owing to the unsatisfied imaging quality and limited therapeutic efficacy.Fortunately,the emerging of aggregation-induced emission(AIE)molecules with unique fluorescence property offers an opportunity to solve the imaging problem.Besides,further utilizing the tumor microenvironments and external triggers to design the stimuli-responsive imaging-guided therapy could enhance the therapeutic efficacy and reduce the side effects.In this review,the advancements in stimuli-responsive theranostic systems with AIE characteristics are summarized.Theranostic systems are first classified according to their treatment modes,and then subdivided based on various stimuli,including pH,redox,enzyme,and light.In each section,the design strategies and application examples are introduced.At last,the current state of the art,limitations,as well as prospects are also discussed.
基金supported by the National Natural Science Foundation of China (21525523, 21574048, 21375042, 21405054)the National Basic Research Program of China (2015CB932600, 2013CB933000)+1 种基金the Special Fund for Strategic New Industry Development of Shenzhen, China (JCYJ20150616144425376)1000 Young Talent (to Fan Xia)
文摘The capability to image, as well as control and manipulate single molecules such as nucleic acids(DNA or RNA) can greatly enrich our knowledge of the roles of individual biomolecules in cellular processes and their behavior in native environments. Here we summarize the recent advances of single nucleic acid imaging based on optical observation and force manipulation. We start by discussing the superiority of single molecule image, the central roles nucleic acids play in biosystems, and the significance of single molecule image towards nucleic acids. We then list a series of representative examples in brief to illustrate how nucleic acid of various morphologies has been imaged from different aspects, and what can be learned from such characterizations. Finally,concluding remarks on parts of which should be improved and outlook are outlined.
基金support by the National Key R&D Program of China(no.2020YFA0211200)the National Natural Science Foundation of China(nos.22090050,21974128,21874121,and 52003257)the Hubei Provincial Natural Science Foundation of China(nos.2019CFA043 and 2020CFA037).
文摘The cell membrane is a vital barrier that protects the cell from external damage and is involved in many biochemical processes.Thus,it is of great significance to label the cell membrane to explore its function.However,due to its complex and dynamic nature,precise and firm cell membrane labeling simultaneously is still a challenge.Herein,we report the fabrication of a peptide-conjugated aggregationinduced emission fluorogen(AIEgen),RTP,consisting of three main components:(1)An integrin-targeting peptide(RGD,R),which could bind specifically to integrinαvβ3 on cell membranes through ligand–receptor interaction.(2)An AIE-active tetraphenylethene derivative(T-MY,T)for fluorescent imaging.(3)Palmitic acid-modified peptide(Pal-RRRR,P),in which Pal isinserted into the lipid on the cellmembrane by hydrophobic interaction,and RRRR interacted with the negatively charged cell membrane components(proteins and lipids)through electrostatic forces.RTP could precisely label tumor cells with high integrinαvβ3 expression andfirmly trace the cellmembrane for up to 4 h;it also has a strong resistance to photobleaching.Moreover,RTP achieved in vivo tumor-specific imaging via cell membrane labeling.Thereby,utilizing multiple weak interactions between the fluorescent probe and the cell membrane provided a new strategy for precise and firm imaging of the cell membrane simultaneously.
基金supported by the National Key R&D Program of China(2020YFA0211200)the National Natural Science Foundation of China(22090050,21974128,21874121,52003257)Hubei Provincial Natural Science Foundation of China(2019CFA043,2020CFA037)。
文摘Precisely analyzing the target materials in living cells can reveal the essence and mystery of life at a deeper level,which will provide reliable theoretical basis for the occurrence,development,treatment and prognosis of major diseases.However,because living cells are in the dynamic process of metabolism,there are several challenges existed in accurate analysis,including subcellular compartment heterogeneity,plasma membrane interface barrier,and cell cycle regulation.In this regard,our group has designed and synthesized a series of multifunctional aggregates by mainly integrating the peptide elements,nucleic acid elements and aggregation elements to overcome the barriers.This article summarizes the latest developments of multifunctional aggregates for precise cell analysis by our group,and systematically introduces them according to different design concepts and targeting dimensions,such as space,efficiency as well as time.We hope this work could contribute to analyzing the biomarkers in cells through constructing the multifunctional aggregates,understanding the operation mechanism of cells,finally inspiring technology breakthroughs in biomedical fields.
基金This work was supported by the National Natural Science Foundation of China(22090050,51803194,21874121,21974128)the National Key Research and Development Program of China(2018YFE0206900)+1 种基金Hubei Provincial Natural Science Foundation of China(2020CFA037)Zhejiang Provincial Natural Science Foundation of China(LY20B050002,LD21B050001).
文摘Diseases often come from a cell or even a molecule misperforms its function.Obtaining fluctuation of nucleic acids,proteins,glycans and other biomolecules is helpful to reveal the molecular mechanism of diseases and promote the development of biology and medicine.To date,precise measurement of single molecule and single cell in the life systems has become a significant research topic of analytic chemistry,and also an important way for chemists devoting to“Healthy China Strategy”
基金supported by the National Natural Science Foundation of China(21788102)the GuangDong Basic and Applied Basic Research Foundation(2023B1515040003,2022 A 1515010315 and 2019B030301003)the Fundamental Research Funds for the Central Universities(2022ZYGXZR107).
文摘Photochemical reaction is expected to become a promising type of green chemistry with merits of operational flexibility,excellent regioselectivity,high yield,and mild reaction condition.Recently,aggregation-induced emission(AIE)-based fluorescent molecules with photoresponsivity have been quickly developed and employed in the biomedical field.In this Review,photoresponsive AIE materials based on the inherent photochemical reactions are highlighted according to the photochemical pathways:photoisomerization,photocyclization,photodimerization,and multiple photoreactions.Following this,their biomedical applications are summarized and discussed,including photoactivatable bioimaging,diagnosis,and therapy.Finally,the challenges and future perspectives are presented.
