[Show abstract][Hide abstract] ABSTRACT: Lung adenocarcinoma (LAC), the primary histological type of non-small cell lung cancer (NSCLC), has displayed an increasing incidence and mortality worldwide. However, therapeutic approaches were limited. Dysregulation of some lncRNAs has been shown in various types of cancers including LAC. The aim of the present study was to vertify lncRNA DLX6-AS1 expression in LAC.
Microarray assay revealed expression profile of lncRNAs in LAC. qRT-PCR ( quantitative reverse transcription PCR) was performed to identify lncRNA DLX6-AS1 expression level in 72 paired LAC and adjacent normal lung tissues. qRT-PCR and Western blotting were used to verify that down-regulation lncRNA DLX6-AS1 decreased DLX6 (distal-less homeobox 6) mRNA and protein expression.
Microarray analysis identified up-regulation of 272 lncRNAs and down-regulation of 635 lncRNAs in LAC tissues. The expression level of lncRNA DLX6-AS1 in LAC tissues was significantly higher compared to paired adjacent normal lung tissues (P< 0.05). In addition, its expression level was closed correlated with both histological differentiation (P = 0.004) and TNM stage (P = 0.033). qRT-PCR and Western blotting analysis showed that DLX6 mRNA and protein levels were lower in si-LncRNA group than in the NC (negative control) and Blank groups.
Microarray analysis identified that lncRNA DLX6-AS1 was up-regulated in LAC tissues. High DLX6-AS1 expression levels were significantly associated with both histological differentiation and TNM stage. Down-regulation of lncRNA DLX6-AS1 expression decreased the DLX6 mRNA and protein levels.
Cancer Cell International 12/2015; 15(1). DOI:10.1186/s12935-015-0201-5 · 2.77 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: MiR-198 is involved in tumorigenesis, migration, invasion, and metastasis of various malignant cancers. However, the exact expression levels of miR-198 and the molecular mechanism underlying its role in lung adenocarcinoma require further exploration. In this study, quantitative real-time PCR was applied to study miR-198 and serine hydroxymethyltransferase 1 (SHMT1) expression in 47 paired lung adenocarcinoma tissues and adjacent nontumor lung tissues. Clinicopathological characters were analyzed. Pearson's correlation analysis was used to detect the relationship between miR-198 and SHMT1 expression. The function of miR-198 was explored by measuring cell proliferation, cell apoptosis, and the cell-cycle in vitro and in vivo. The target gene of miR-198 was certified using dual luciferase report assay. We found that in lung adenocarcinoma, miR-198 was significantly downregulated and SHMT1 was inversely upregulated. A strong negative correlation was noticed between miR-198 and SHMT1 expression. Further analysis revealed that miR-198 expression was associated with TNM stage and lymph node metastasis. Upregulated miR-198 could inhibit cell proliferation, enhance cell apoptosis, and lead to cell-cycle arrest in lung adenocarcinoma, which showed a more effective alteration than SHMT1 siRNA. Moreover, we identified SHMT1 as a target gene of miR-198. In conclusion, miR-198 suppressed proliferation of lung adenocarcinoma cells both in vitro and in vivo by directly targeting SHMT1. miR-198 may be a potential therapeutic target for lung adenocarcinoma in the near future.
[Show abstract][Hide abstract] ABSTRACT: Eleven new cassane-type diterpenoids (1-11), along with 12 known compounds were isolated from the seeds of Caesalpinia minax Hance. Their structures were determined by extensive spectroscopic methods in combination with X-ray diffraction analysis. All the compounds were evaluated for COX-2 inhibitory activity, and displayed different levels of inhibition except for 14 whose C and D rings were connected through a spiro-atom. Among them, compound 23, a furanoditerpenoid lactone with a hydroxyl group at C-1 displayed the most potent inhibitory activity with an inhibition ratio of 82.0% at 4.0 μM, which was stronger than its analog 16 with an additional hydroxyl group at C-2. Further detailed testing showed that both compounds 23 and 16 dose-dependently inhibited the COX-2 enzyme with IC50 values of 2.4 ± 0.1 and 3.2 ± 0.2 μM, respectively. Molecular docking analysis showed significant hydrogen bonding and π-π interactions with the enzyme, and revealed the docking scores 36.3108 and 28.6678 for 23 and 16, respectively, which are consistent with their IC50 values. Cytotoxic assay showed that all these diterpenoids only exhibit weak activities with IC50 values over 50 μM on normal cells. Thus, these diterpenoids might be potential anti-inflammatory agents targeting the COX-2 enzyme with low toxicity.
[Show abstract][Hide abstract] ABSTRACT: Abstract Nanomaterial-based signal-amplification strategies hold a great promise in realizing sensitive biological detection. A simple label-free electrochemical immunosensor for sensitive detection of carcinoembryonic antigen (CEA) was developed by immobilizing anti-CEA antibodies onto the Au-F127 strawberry-like nanospheres modified glassy carbon electrode (Au-F127/GCE). The Au-F127 strawberry-like nanospheres offered a large surface and multifunctional substrate for the effective immobilization of anti-CEA and the existence of Au could accelerate electron transfer and make the electrochemical signal amplified. The Au-F127 nanocomposites and anti-CEA were characterized by transmission electron microscopy (TEM), polycrystalline electron diffraction ring pattern, ultra-violet visible (UV-vis) spectra and attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectra. Electrochemical impedance spectroscopy (EIS) and differential pulse voltammetry (DPV) were employed to verify the stepwise assembly of the immunosensor and evaluated the analytical performance of the fabricated immunosensor, respectively. The immunosensor showed a wide liner response range between 0.01 and 80 ng mL-1 with a low detection limit of 0.24 pg mL-1 at a signal-to-noise (S/N) ratio of 3. Additionally, the proposed method was successfully applied to determine CEA in human serum samples with satisfactory results.
[Show abstract][Hide abstract] ABSTRACT: The relationships between lncRNAs and tumors have currently become one of the focuses on cancer studies. However, there are a few studies about lncRNAs in non-small cell lung cancer (NSCLC) at present.
Microarray analysis was designed to study the expression patterns of lncRNAs in three pairs of NSCLC tissues. The expression of lncRNA RGMB-AS1 and repulsive guidance molecule b (RGMB) were detected in 72 paired NSCLC tissues and adjacent normal tissues by qRT-PCR assay. The relations of lncRNA RGMB-AS1 and RGMB expression with clinicopathological factors of NSCLC patients were explored. A549 and SPC-A-1 cells were transfected with siRNA of lncRNA RGMB-AS1 and negative control. RGMB expression level was detected by qRT-PCR assay and western blot analysis.
The results of microarray found that 571 lncRNAs were differentially expressed in NSCLC tissues (Fold change cut-off: 5.0, P < 0.05), including 304 upregulated and 267 downregulated lncRNAs. The results of qRT-PCR showed that lncRNA RGMB-AS1 expression was significantly higher in NSCLC tissues than in adjacent normal tissues (P < 0.05), while RGMB mRNA showed an opposite trend (P < 0.05). Correlation analysis indicated that the expression of lncRNA RGMB-AS1and RGMB mRNA were inversely correlated (R(2) = 0.590, P < 0.05). While lncRNA RGMB-AS1 and RGMB expression levels in NSCLC tissues were associated with the occurrence of differentiation status, lymph node metastases and TNM stage (P < 0.05). Transfection with siRNA of lncRNA RGMB-AS1, subsequent results showed that RGMB mRNA and protein expression were upregulated (P < 0.05) in A549 and SPC-A-1 cells compared to the control groups.
We identified lncRNA RGMB-AS1 was upregulated and RGMB was downregulated in NSCLC patients. Both were related to differentiation status, lymph node metastases and TNM stage. Studies also indicated that lncRNA RGMB-AS1and RGMB were inversely correlated.
The virtual slide(s) for this article can be found here: http://www.diagnosticpathology.diagnomx.eu/vs/7911587521528276.
[Show abstract][Hide abstract] ABSTRACT: The present study aimed to identify serum biomarkers for the detection of hepatoblastoma (HB). Serum samples were collected from 71 HB patients (stage I, n = 19; stage II, n = 19, stage III, n = 19; and stage IV, n = 14) and 23 age- and sex-matched healthy children. Differential expression of serum protein markers were screened using surface-enhanced laser desorption/ionization time-of-flight mass spectrometry (SELDI-TOF-MS), and the target proteins were isolated and purified using HPLC and identified using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS), SEQUEST, and bioinformatics analysis. Differential protein expression was confirmed by enzyme-linked immunosorbent analysis (ELISA). SELDI-TOF-MS screening identified a differentially expressed protein with an m/z of 9348 Da, which was subsequently identified as Apo A-I; its expression was significantly lower in the HB group as compared to the normal control group (1546.67 ± 757.81 vs. 3359.21 ± 999.36, respectively; p < 0.01). Although the expression level decreased with increasing disease stage, pair-wise comparison revealed significant differences in Apo A-I expression between the normal group and the HB subgroups (p < 0.01). ELISA verified the reduced expression of Apo A-I in the HB group. Taken together, these results suggest that Apo A-I may represent a serum protein biomarker of HB. Further studies will assess the value of using Apo A-I expression for HB diagnosis and staging.
International Journal of Molecular Sciences 06/2015; 16(6):12669-12685. DOI:10.3390/ijms160612669 · 2.86 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: MicroRNAs (miRNAs) have important roles in the initiation and progression of human cancer, including breast cancer. We evaluated miR‑365 expression in breast cancer tissues, and investigated its effects on cell growth, cell cycle, cell invasion, and expression of its target gene ADAMTS-1. miR‑365 expression levels were analyzed in breast cancer tissues and adjacent normal tissues using qRT-PCR. CCK-8, cell cycle, and invasion assays were used to explore the role of miR‑365 expression in breast cancer cells. We conducted luciferase reporter and western blot assays to test whether ADAMTS-1 is a direct target of miR‑365. We found that miR‑365 expression levels were significantly higher in breast cancer tissues compared with adjacent non-tumor tissues (P<0.05). These relatively high expression levels were significantly associated with advanced clinical stages (P<0.05). In breast cancer cell lines, transfection with miR‑365 inhibitor suppressed proliferation and invasion, and resulted in cell cycle arrest. Subsequent experiments indicated that miR‑365 bound the 3'-UTR of ADAMTS-1 and downregulated its expression. Our findings indicated that the inhibition of miR‑365 reduced cell proliferation and cell invasion. Additionally, miR‑365 may function as a novel oncogene in breast cancer through targeting ADAMTS-1. These findings provide insight into the mechanism of breast cancer pathogenesis.
International Journal of Oncology 05/2015; 47(1). DOI:10.3892/ijo.2015.3015 · 3.03 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The aim of the present study was to identify a child hepatoblastoma serum biomarker that is unaffected by inflammatory factors, with the ultimate aim of finding an effective method for the early diagnosis of hepatoblastoma. The magnetic bead-based weak cation exchange chromatography technique was used to process serum harvested from 30 children with hepatoblastoma, 20 children with systemic inflammatory response syndrome (SIRS) and 20 healthy children. Proteins differentially expressed in SIRS were excluded from consideration as biomarkers for hepatoblastoma. Proteins differentially expressed in hepatoblastoma and healthy controls were screened using surface-enhanced laser desorption/ionization-time of flight-mass spectrometry (SELDI-TOF-MS). Target proteins were purified by SDS-PAGE, and matrix-assisted laser desorption/ionization (MALDI)-TOF-MS was used to determine their amino acid sequences. Protein matches were searched in the SwissProt database. Quantitative polymerase chain reaction (qPCR) and ELISA were employed to confirm the expression of target proteins. Following screening to exclude inflammatory factors, SELDI-TOF-MS revealed a protein with a mass-to-charge ratio of 9,348 Da that was expressed at significantly lower levels in the serum of children with hepatoblastoma compared with healthy controls (P<0.01). Sequence analysis identified this protein as apolipoprotein A-1 (Apo A-I). qPCR and ELISA confirmed that the expression of Apo A-I mRNA and protein were significantly lower in children with hepatoblastoma compared with healthy controls (P<0.05). These results indicate that Apo A-I is a non-inflammatory protein marker for hepatoblastoma with the potential for use in early diagnosis of hepatoblastoma. In addition, the present study demonstrates the feasibility of proteomic screening for the identification of proteins that can serve as markers for a specific tumor.
[Show abstract][Hide abstract] ABSTRACT: The present study investigated the differential expression of cytokine-induced apoptosis inhibitor 1 (CIAPIN1) in human multiple myeloma (MM) bone marrow tissue and adjacent healthy bone marrow tissue. In addition, the effect of a transduced CIAPIN1 gene on the growth of the RPMI‑8226 human MM cell line was investigated. CIAPIN1 protein expression was detected in 32 samples of paraffin‑embedded MM and adjacent healthy bone marrow tissue using immunohistochemistry. The CIAPIN1 gene (Ad‑CIAPIN1, small interfering RNA) was inserted into a lentiviral vector and transfected into the RPMI‑8226 human MM cell line. The expression of target proteins CIAPIN1 and insulin‑like growth factor 1U (IGF‑1), cell cycle‑regulatory proteins and functional proteins was detected using western blotting. MTT and soft agar colony formation assays were conducted, and cellular tumorigenicity in nude mice was assessed, in order to investigate the proliferative capacity of cells in vitro and in vivo. Flow cytometry was applied in order to analyze changes in the cell cycle and cell apoptosis. CIAPIN1 expression was significantly reduced in cells from the 32 MM samples compared with those from healthy bone marrow (P<0.05). Upregulation of CIAPIN1, following transduction by lentiviral vectors, caused cells to arrest in G1/S phase of the cell cycle and significantly inhibited the growth of the RPMI‑8226 MM cell line in vitro and in vivo. CIAPIN1 was shown to inhibit cell growth. Specifically, it inhibited cyclin‑dependent kinase 2, cyclin‑dependent kinase 4 and insulin‑like growth factor‑1. Increased expression of CIAPIN1 also led to an increase in the levels of p27 and Rb, an effect that may have been achieved via regulation of cell cycle proteins and functional proteins. The results of the present study suggest that downregulation of the CIAPIN1 gene in MM cells may be associated with the development of this disease. CIAPIN1 transfection in RPMI‑8226 cells significantly inhibited the growth of tumor cells, suggesting that the CIAPIN1 gene is a potential tumor suppressor.
Molecular Medicine Reports 04/2015; 12(2). DOI:10.3892/mmr.2015.3656 · 1.55 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: To investigate the timing, safety and efficacy of prophylactic antiviral therapy in patients with hepatitis B virus (HBV) infection undergoing allogeneic hematopoietic stem cell transplantation (allo-HSCT).
This prospective study recruited a total of 57 patients diagnosed with malignant hematological diseases and HBV infection at the First Affiliated Hospital of Sun Yat-sen University between 2006 and 2013. The patients were classified as hepatitis B surface antigen (HBsAg)-positive or HBsAg-negative/ antiHBc-positive. Patients were treated with chemotherapy followed by antiviral therapy with nucleoside analogues. Patients underwent allo-HSCT when serum HBV DNA was < 10(3) IU/mL. Following allo-HSCT, antiviral therapy was continued for 1 year after the discontinuation of immunosuppressive therapy. A total of 105 patients who underwent allo-HSCT and had no HBV infection were recruited as controls. The three groups were compared for incidence of graft-vs-host disease (GVHD), drug-induced liver injury, hepatic veno-occlusive disease, death and survival time.
A total of 29 of the 41 subjects with chronic GVHD exhibited extensive involvement and 12 exhibited focal involvement. Ten of the 13 subjects with chronic GVHD in the HBsAg(-)/hepatitis B core antibody(+) group exhibited extensive involvement and 3 exhibited focal involvement. Five of the 10 subjects with chronic GVHD in the HBsAg(+) group exhibited extensive involvement and 5 exhibited focal involvement. The non HBV-infected group did not differ significantly from the HBsAg-negative/antiHBc-positive and the HBsAg-positive groups which were treated with nucleoside analogues in the incidence of graft-vs-host disease (acute GVHD; 37.1%, 46.9% and 40%, respectively; P = 0.614; chronic GVHD; 39%, 40.6% and 40%, respectively; P = 0.98), drug-induced liver injury (25.7%, 18.7% and 28%, respectively; P = 0.7), death (37.1%, 40.6% and 52%, respectively; P = 0.4) and survival times (P = 0.516). One patient developed HBV reactivation (HBsAg-positivity) due to early discontinuation of antiviral therapy.
Suppression of HBV DNA to < 10(3) IU/mL before transplantation, continued antiviral therapy and close monitoring of immune markers and HBV DNA after transplantation may assure the safety of allo-HSCT.
[Show abstract][Hide abstract] ABSTRACT: Dysplastic changes in erythroid precursors occur not only in patients with hematologic diseases, but also those with other diseases. Here, we report on a patient that presented with dysplastic changes in erythroid precursors due to lead poisoning from the intake of Chinese folk remedies.
International journal of clinical and experimental pathology 03/2015; 8(1):818-23. · 1.89 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Caesalpinimin A (1), a novel cassane furanoditerpene with an unprecedented carbon skeleton containing a spiro-A/B ring system was isolated from the seeds of Caesalpinia minax. The complete structure and absolute configuration were elucidated by spectroscopic methods and computational analysis.
[Show abstract][Hide abstract] ABSTRACT: This stud y examined the epidemiology, risk factors, management, and outcome of invasive fungal infection (IFI) in patients receiving chemotherapy for hematological malignancy in China. IFI risk factors were analyzed using univariate analysis and multivariate logistic regression. In total, 4,192 patients receiving 4,889 chemotherapy courses were enrolled [mean age 40.7 years, 58.4 % male, 16.9 % children (<18 years)]. The most common hematological diseases were acute myeloid leukemia (AML, 28.5 %), non-Hodgkin lymphoma (NHL, 26.3 %), and acute lymphoblastic leukemia (ALL, 20.2 %). Severe neutropenia (absolute neutrophil count [ANC] <500/mm(3)) occurred after one third (1,633/4,889, 33.4 %) of chemotherapy courses. Incidence of proven/probable IFI was 2.1 % per chemotherapy course and higher in patients with myelodysplastic syndrome (MDS, 4.94 %), acute hyperleukocytic leukemia (AHL, 4.76 %), AML (3.83 %), or induction chemotherapy. Risk factors included ANC <500/mm(3) [odds ratio (OR) 3.60], AML or MDS (OR 1.97), induction chemotherapy (OR 2.58), previous IFI (OR 3.08), and being male (OR 1.74). Antifungal agents, prescribed in one quarter (1,211/4,889, 24.8 %) of chemotherapy courses, included primary/secondary prophylaxis (n = 827, 16.9 %) and/or treatment (n = 655, 13.4 %; 86.9 % triazoles), which was empirical (84.3 %), pre-emptive (8.6 %), or targeted (7.1 %). Overall mortality following each chemotherapy course (1.5 %) increased in proven/probable (11.7 %) and possible IFI (8.2 %). In summary, IFI was more common in MDS, AHL, AML, or induction chemotherapy, and substantially increased mortality. Neutropenic patients receiving induction chemotherapy for AML or MDS and those with previous IFI were at particular risk. Antifungal prophylaxis showed an independent protective effect but was not commonly used, even in high-risk patients. By contrast, empiric antifungals were widely used.
[Show abstract][Hide abstract] ABSTRACT: MicroRNAs are implicated in the regulation of various cellular processes, including proliferation, differentiation, cell death, and cell mobility, and can function either as oncogenes or tumor suppressors in tumor progression. The effects of the expression of miR-96 in non-small cell lung cancer (NSCLC) remain unclear. In our study, qRT-PCR (quantitative reverse transcription PCR) was performed to identify the miR-96 expression level in 68 paired NSCLC and adjacent normal lung tissues. Trans-well, cell counting kit-8, and apoptosis assays were used to evaluate the effects of miR-96 expression on cell invasion, proliferation, and apoptosis. Dual-luciferase reporter assay and Western blotting were used to verify whether FOXO3 was a potential major target gene of miR-96. Finally, the effect of FOXO3 on miR-96-induced cell survival was determined by transfection of the genes expressing FOXO3 lacking 3'UTR and miR-96. The expression level of miR-96 in NSCLC tissues was higher than that in adjacent normal lung tissues, and this increased expression was significantly associated with lymph node metastasis. In contrast to the cells in the blank and negative control groups, the number of cells migrating through the matrigel was significantly lower and the incidence of apoptosis was significantly higher in cells transfected with a miR-96 inhibitor. Western blotting and dual-luciferase reporter assays demonstrated that miR-96 can bind to the putative seed region in FOXO3 mRNA 3'UTR, and can significantly lower the expression of FOXO3. The introduction of FOXO3 cDNA without 3'UTR restored miR-96 induced cell apoptosis and invasion. MiR-96 is up-regulated in NSCLC tissues. Downregulation of miR-96 inhibits invasion and promotes apoptosis in NSCLC cells A549 and SPC-A-1 by targeting FOXO3. Therefore, our study improves our understanding of the mechanisms underlying NSCLC pathogenesis and may promote the development of novel targeted therapies.
[Show abstract][Hide abstract] ABSTRACT: Spontaneous remission (SR) of leukemia is a rare event in clinic, which possibly correlated with severe infection and sepsis, but its exact mechanism has not been confirmed. Plasmacytoid dendritic cells (pDC) and myeloid dendritic cells (mDC) play a key role in innate and adaptive immunity respectively. A patient with severe infection of staphylococcus aureus acquired completely spontaneous remission (SR), moreover a increased number of pDC were observed, suggesting that bacteria-activated pDC may play an important role in SR. This study was purposed to explore if the bacteria can stimulate pDC successfully and get a functional pDC. Both pDC and mDC were isolated from freshly collected, leukocyte-rich buffy coats from healthy blood donor and leukemic patient with SR by using MACS and FACS. The pDC were cultured in RPMI 1640 medium and were stimulated with different kinds of bacteria and the expression of CD40, CD86 and HLA-DR on the cell surface was analyzed by flow cytometry. The cytokine (IFN-α, IL-12, IFN-γ, IL-2, IL-4, IL-10) production was measured by using ELISA kits. The results showed that the stimulation with staphylococcus aureus and pseudomonas aeruginosa resulted in the maturation of pDC, which secrete a large number of IFN-α and promote the differentiation of naive CD4(+) T cells to Th1 cells. The activated pDC expressed high level of CD40 and CD86 and showed higher T cell stimulatory capacities. It is concluded that staphylococcus aureus and pseudomonas aeruginosa can activate pDC, the activated pDC secrete high quantity of IFN-α. This result suggests that bacteria stimulated pDC may play a key role in SR of leukemia following severe infections.
Zhongguo shi yan xue ye xue za zhi / Zhongguo bing li sheng li xue hui = Journal of experimental hematology / Chinese Association of Pathophysiology 09/2014; 22(5):1286-90.
[Show abstract][Hide abstract] ABSTRACT: Abstract In order to investigate HBV reactivation and survival in MM patients receiving bortezomib-containing regimens, we analyzed 139 MM patients receiving bortezomib-containing regimens in our hospital. 27/139 patients were HBsAg+ with 9 of them having DNA levels > 500IU/ml including 4 > 1000 IU/ml. All but 5 HBsAg+ patients were treated with lamivudine or entecavir before chemotherapy until at least 6 months after chemotherapy or ASCT. HBV reactivation occurred in 6 HBsAg+ patients and 2 HBsAg- patients, including 6 who received an ASCT. OS and PFS of HBsAg- patients were significantly longer than HBsAg+ patients (both P values < 0.01). In view of these results, we confirmed that incidence of HBV reactivation was notable in MM patients receiving bortezomib-containing regimens, especially those underwent ASCT. HBsAg+ MM patients had poorer prognosis than HBsAg- patients. Prophylactic treatment should be prescribed to all HBsAg+ MM patients for a minimal duration of 12 months.
Leukemia and Lymphoma 08/2014; 56(6):1-27. DOI:10.3109/10428194.2014.941833 · 2.89 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The development of novel nanomaterials for the ultra-sensitive detection of biological species has received great attention. Herein we report the design and synthesis of phytic acid functionalized silica nanoparticles (SiO2-PA NPs) and their biomedical sensor application for sensitive detection of dopamine. The SiO2-PA NPs were characterized by transmission electron microscopy (TEM) and Energy dispersive X-ray spectrometer (EDS). The biocompatibility between SiO2-PA NPs and laccase was also investigated by circular dichroism (CD) spectra. Moreover, the novel laccase biosensor based on SiO2-PA NPs for sensitive detection of dopamine (DA) was fabricated, and the electrochemical properties of this laccase biosensor were investigated. The results showed the biosensor had good electrocatalytic activity toward DA with a wide linear range (0.99–103.10 μM) and a low detection limit 0.26 ± 0.003 μM. It can be attributed to the good biocompatibility and nano-effect of SiO2-PA NPs. The biosensor was successfully tested for determination of DA in pharmaceutical and rabbit blood serum samples. The development of biomimetic materials science will offer a novel platform for application to substance detection.
Sensors and Actuators B Chemical 07/2014; 197:292–299. DOI:10.1016/j.snb.2014.03.002 · 4.10 Impact Factor