Modern medicine is increasingly interested in advanced sensors to detect and analyze biochemical indicators.Ion sensors based on potentiometric methods are a promising platform for monitoring physiological ions in bio...Modern medicine is increasingly interested in advanced sensors to detect and analyze biochemical indicators.Ion sensors based on potentiometric methods are a promising platform for monitoring physiological ions in biological subjects.Current semi-implantable devices are mainly based on single-parameter detection.Miniaturized semi-implantable electrodes for multiparameter sensing have more restrictions on the electrode size due to biocompatibility considerations,but reducing the electrode surface area could potentially limit electrode sensitivity.This study developed a semi-implantable device system comprising a multiplexed microfilament electrode cluster(MMEC)and a printed circuit board for real-time monitoring of intra-tissue K^(+),Ca^(2+),and Na^(+)concentrations.The electrode surface area was less important for the potentiometric sensing mechanism,suggesting the feasibility of using a tiny fiber-like electrode for potentiometric sensing.The MMEC device exhibited a broad linear response(K^(+):2–32 mmol/L;Ca^(2+):0.5–4 mmol/L;Na^(+):10–160 mmol/L),high sensitivity(about 20–45 mV/decade),temporal stability(>2weeks),and good selectivity(>80%)for the above ions.In vitro detection and in vivo subcutaneous and brain experiment results showed that the MMEC system exhibits good multi-ion monitoring performance in several complex environments.This work provides a platform for the continuous real-time monitoring of ion fluctuations in different situations and has implications for developing smart sensors to monitor human health.展开更多
Objective: To investigate the infection of human embryo fibroblast cell line HF cells by CMV as well as the effects of CMV on β-actin mRNA and microfilaments. Methods: HF cells shape was observed after the infection ...Objective: To investigate the infection of human embryo fibroblast cell line HF cells by CMV as well as the effects of CMV on β-actin mRNA and microfilaments. Methods: HF cells shape was observed after the infection of CMV.RT-PCR assay was used to detect the mRNA expression of CMV immediate early (IE) gene, β-actin and GAPDH genes of HF cells infected by CMV. CMV particles and cell microfilaments were detected with electron microscope. Results: Shape of HF cell changed after the infection by CMV. HF cells infected by CMV could express IE mRNA and the expression of β-actin mRNA decreased in a time-and titer-dependent manner compared with the uninfected HF cells whose expression of GAPDH mRNA did not change much. CMV particles were found with electron microscope in the cells. Microfilaments were ruptured and shortened after the infection of CMV. Conclusion: CMV can not only infect human embryo fibroblast cells line HF cells and replicate in the cells, but can also affect the expression of β-actin mRNA and the microfilaments.展开更多
The distribution and morphology alterations of microfilaments and microtubules in the mesophyll cells and root-tip cells of wheat seedlings, which had been radiated by enhanced ultraviolet-B (10.08 KJ·m-2·d-...The distribution and morphology alterations of microfilaments and microtubules in the mesophyll cells and root-tip cells of wheat seedlings, which had been radiated by enhanced ultraviolet-B (10.08 KJ·m-2·d-1), were examined through the confocal laser scanning microscope (Model FV1000, Olympus, Japan). Microtubule was labeled with an indirect immunofluorescence staining method, and microfilament was labeled with fluorescein isothiocyanate-phalloidin (FITC-Ph) as probes. The results indicated that microtubules in mesophyll cells, compared with the controls, would be depolymerized significantly, and dispersed randomly showing some spots or short rods in the cytoplasm, under the enhanced UV-B radiation condition. The microtubule bundles tended to be diffused, and the fluorescence intensity of that significantly decreased. The distribution pattern of microfilaments, which usually arranged parallelly in control cells, was broken up by enhanced UV-B radiation. We further investigated the distribution and morphology of microtubules in root-tip cells during every stage of cell division, and found that these aberrant phenomena of microtubules were often associated with abnormal cell division. Our findings suggested that the distribution, morphology and structure of cytoskeleton in mesophyll cells and root-tip cells of wheat seedlings would be affected by enhanced UV-B radiation, which might be related to abnormal cell division caused by enhanced UV-B radiation as an extracellular signal.展开更多
The polyester microfilament was prepared by means ofnormal fully drawn yarn(FDY)equipment.The effectof water content in chips,the molecular weight of thechips,the jet stretch ratio and the lateral blow on thespinnabil...The polyester microfilament was prepared by means ofnormal fully drawn yarn(FDY)equipment.The effectof water content in chips,the molecular weight of thechips,the jet stretch ratio and the lateral blow on thespinnability and the finest titre of filament that could bereach were discussed.Under convenient conditions,thefiber with linear density of about 1.4 dtex could be ob-tained.By means of wide angle X-ray diffractometer(WAXD),differential scanning calorimeter(DSC)andInstrontester,the structure and properties of the mi-crofilament were discussed.展开更多
Objective:To explore the influence of EBP50(ezrin-radixin-moesin-binding phospho-protein-50) on microfilament cytoskeleton content and distribution in cultured Hela cells, and to investigate the relationship between t...Objective:To explore the influence of EBP50(ezrin-radixin-moesin-binding phospho-protein-50) on microfilament cytoskeleton content and distribution in cultured Hela cells, and to investigate the relationship between the changes in microfilament cytoskeleton localization and EBP50 after PDGF(platelet-derived growth factor) stimulation, and to further clarify the molecular mechanism by which EBP50 suppresses tumor cell proliferation and migration.Methods:pBK-CMV-HAEBP50 wild type recombinant plasmid and pBK-CMV-HA empty vector were transfected into Hela cells.G418 at 350 mg/L was used to screen for cell clones stably expressing EBP50.Western blot was carried out to detect EBP50 expression.Similarities and differences in microfilament cytoskeleton content and distribution in Hela cells transfected with pBK-CMV-HA-EBP50 wild type recombinant plasmid and pBK-CMV-HA empty vector were also treated with PDGF(10 ng/mL and 20 ng/mL, 37 ℃, 15 min) and stained by rhodamine-labeled phalloidin to observe the distribution of microfilament cytoskeleton in the two groups.EBP50 protein distribution in PDGF-stimulated Hela cells was detected by immunofluorescence.Results:Western blot results confirmed that the EBP50 cDNA fragment could express EBP50 in cultured Hela cell lines and that cell lines stably expressing EBP50 were successfully obtained.Western blot and fluorescence results showed that in the cell line transfected with empty vector, the microfilament cytoskeleton was thick, loose, multidirectional and displayed crossing arrangements.The content of microfilament cytoskeleton in the cell line transfected with pBK-CMV-HA-EBP50 was different from that found in the cell line transfected with empty vector.EBP50 expression enhanced microfilament cytoskeleton polymerization into compact thin filaments.Under the stimulation of PDGF, EBP50 migrated to the cell membrane from the cytosol together with microfilament cytoskeleton and co-localized there.Conclusion:EBP50 can change the distribution of microfilament cytoskeleton in cultured Hela cells and can also bind the microfilament cytoskeleton to the cell membrane under the stimulation of PDGF.EBP50 may play a role in the proliferation and migration of tumor cells by influencing the distribution and localization of microfilament cytoskeleton.展开更多
基金The authors would like to acknowledge financial support from the National Key R&D Program of China(Nos.2021YFF1200700 and 2021YFA0911100)the National Natural Science Foundation of China(Nos.T2225010,32171399,and 32171456)+4 种基金the Fundamental Research Funds for the Central Universities,Sun Yat-Sen University(No.22dfx02)Pazhou Lab,Guangzhou(No.PZL2021KF0003)The authors also would like to thank the funding support from the Opening Project of Key Laboratory of Microelectronic Devices&Integrated Technology,Institute of Microelectronics,Chinese Academy of Sciences,and State Key Laboratory of Precision Measuring Technology and Instruments(No.pilab2211)QQOY would like to thank the China Postdoctoral Science Foundation(No.2022M713645)JL would like to thank the National Natural Science Foundation of China(No.62105380)and the China Postdoctoral Science Foundation(No.2021M693686).
文摘Modern medicine is increasingly interested in advanced sensors to detect and analyze biochemical indicators.Ion sensors based on potentiometric methods are a promising platform for monitoring physiological ions in biological subjects.Current semi-implantable devices are mainly based on single-parameter detection.Miniaturized semi-implantable electrodes for multiparameter sensing have more restrictions on the electrode size due to biocompatibility considerations,but reducing the electrode surface area could potentially limit electrode sensitivity.This study developed a semi-implantable device system comprising a multiplexed microfilament electrode cluster(MMEC)and a printed circuit board for real-time monitoring of intra-tissue K^(+),Ca^(2+),and Na^(+)concentrations.The electrode surface area was less important for the potentiometric sensing mechanism,suggesting the feasibility of using a tiny fiber-like electrode for potentiometric sensing.The MMEC device exhibited a broad linear response(K^(+):2–32 mmol/L;Ca^(2+):0.5–4 mmol/L;Na^(+):10–160 mmol/L),high sensitivity(about 20–45 mV/decade),temporal stability(>2weeks),and good selectivity(>80%)for the above ions.In vitro detection and in vivo subcutaneous and brain experiment results showed that the MMEC system exhibits good multi-ion monitoring performance in several complex environments.This work provides a platform for the continuous real-time monitoring of ion fluctuations in different situations and has implications for developing smart sensors to monitor human health.
文摘Objective: To investigate the infection of human embryo fibroblast cell line HF cells by CMV as well as the effects of CMV on β-actin mRNA and microfilaments. Methods: HF cells shape was observed after the infection of CMV.RT-PCR assay was used to detect the mRNA expression of CMV immediate early (IE) gene, β-actin and GAPDH genes of HF cells infected by CMV. CMV particles and cell microfilaments were detected with electron microscope. Results: Shape of HF cell changed after the infection by CMV. HF cells infected by CMV could express IE mRNA and the expression of β-actin mRNA decreased in a time-and titer-dependent manner compared with the uninfected HF cells whose expression of GAPDH mRNA did not change much. CMV particles were found with electron microscope in the cells. Microfilaments were ruptured and shortened after the infection of CMV. Conclusion: CMV can not only infect human embryo fibroblast cells line HF cells and replicate in the cells, but can also affect the expression of β-actin mRNA and the microfilaments.
文摘The distribution and morphology alterations of microfilaments and microtubules in the mesophyll cells and root-tip cells of wheat seedlings, which had been radiated by enhanced ultraviolet-B (10.08 KJ·m-2·d-1), were examined through the confocal laser scanning microscope (Model FV1000, Olympus, Japan). Microtubule was labeled with an indirect immunofluorescence staining method, and microfilament was labeled with fluorescein isothiocyanate-phalloidin (FITC-Ph) as probes. The results indicated that microtubules in mesophyll cells, compared with the controls, would be depolymerized significantly, and dispersed randomly showing some spots or short rods in the cytoplasm, under the enhanced UV-B radiation condition. The microtubule bundles tended to be diffused, and the fluorescence intensity of that significantly decreased. The distribution pattern of microfilaments, which usually arranged parallelly in control cells, was broken up by enhanced UV-B radiation. We further investigated the distribution and morphology of microtubules in root-tip cells during every stage of cell division, and found that these aberrant phenomena of microtubules were often associated with abnormal cell division. Our findings suggested that the distribution, morphology and structure of cytoskeleton in mesophyll cells and root-tip cells of wheat seedlings would be affected by enhanced UV-B radiation, which might be related to abnormal cell division caused by enhanced UV-B radiation as an extracellular signal.
文摘The polyester microfilament was prepared by means ofnormal fully drawn yarn(FDY)equipment.The effectof water content in chips,the molecular weight of thechips,the jet stretch ratio and the lateral blow on thespinnability and the finest titre of filament that could bereach were discussed.Under convenient conditions,thefiber with linear density of about 1.4 dtex could be ob-tained.By means of wide angle X-ray diffractometer(WAXD),differential scanning calorimeter(DSC)andInstrontester,the structure and properties of the mi-crofilament were discussed.
基金Supported by grants from the National Natural Science Foundation ofChina (No. 30572183 and 30772573)Beijing Educational Committee Foundation (No. KZ200610025013)+2 种基金the New Century Excellent Talentsin University of China (No. NCEF-06-0184)Excellent Talents Foundation in Beijing (No. 20071D0501800253)Beijing Novagramme Foundation (No. 2008B58 [MS1]).
文摘Objective:To explore the influence of EBP50(ezrin-radixin-moesin-binding phospho-protein-50) on microfilament cytoskeleton content and distribution in cultured Hela cells, and to investigate the relationship between the changes in microfilament cytoskeleton localization and EBP50 after PDGF(platelet-derived growth factor) stimulation, and to further clarify the molecular mechanism by which EBP50 suppresses tumor cell proliferation and migration.Methods:pBK-CMV-HAEBP50 wild type recombinant plasmid and pBK-CMV-HA empty vector were transfected into Hela cells.G418 at 350 mg/L was used to screen for cell clones stably expressing EBP50.Western blot was carried out to detect EBP50 expression.Similarities and differences in microfilament cytoskeleton content and distribution in Hela cells transfected with pBK-CMV-HA-EBP50 wild type recombinant plasmid and pBK-CMV-HA empty vector were also treated with PDGF(10 ng/mL and 20 ng/mL, 37 ℃, 15 min) and stained by rhodamine-labeled phalloidin to observe the distribution of microfilament cytoskeleton in the two groups.EBP50 protein distribution in PDGF-stimulated Hela cells was detected by immunofluorescence.Results:Western blot results confirmed that the EBP50 cDNA fragment could express EBP50 in cultured Hela cell lines and that cell lines stably expressing EBP50 were successfully obtained.Western blot and fluorescence results showed that in the cell line transfected with empty vector, the microfilament cytoskeleton was thick, loose, multidirectional and displayed crossing arrangements.The content of microfilament cytoskeleton in the cell line transfected with pBK-CMV-HA-EBP50 was different from that found in the cell line transfected with empty vector.EBP50 expression enhanced microfilament cytoskeleton polymerization into compact thin filaments.Under the stimulation of PDGF, EBP50 migrated to the cell membrane from the cytosol together with microfilament cytoskeleton and co-localized there.Conclusion:EBP50 can change the distribution of microfilament cytoskeleton in cultured Hela cells and can also bind the microfilament cytoskeleton to the cell membrane under the stimulation of PDGF.EBP50 may play a role in the proliferation and migration of tumor cells by influencing the distribution and localization of microfilament cytoskeleton.
