The Effect of Heat Aging on the Microstructure and Properties of Spray-Deposited AlZnMgCu Alloy Extruded Plates.

The heat-aging process, a practical aging technology that not only improves the comprehensive performance of Al alloys but also reflects the requirements of short processes, has an extremely practical significance. The effects of the heating rate and termination temperature on the "heat-aging" behavior of a spray-deposited AlZnMgCu alloy hot-extruded plate were investigated using hardness, electrical conductivity, room-temperature tensile strength, exfoliation corrosion experiments, and transmission electron microscopy microstructure (TEM) observation. The results show that as the termination temperature increases, the hardness of the spray-deposited AlZnMgCu alloy first increases to a peak and then rapidly decreases, while the electrical conductivity continues to increase. The increase in the heating rate improves the peak hardness corresponding to the termination temperature. The heat treatment process of heating at a speed of 20 °C/h to 200 °C after the spray deposition has similar mechanical and corrosion resistance properties to the RRA process and can effectively reduce the heating time from 40 h to 8 h, thus establishing a heat treatment process for spray-deposited AlZnMgCu alloy extruded plate with high aging efficiency.

Cost-effectiveness analysis of robot-assisted laparoscopic surgery for complex pediatric surgical conditions.

BACKGROUND: Robotics has been used safely and successfully in a variety of adult surgeries and is gradually gaining ground in pediatrics. While the benefits of robotic-assisted surgery in disease treatment are well recognized, its high cost has led to questions. To investigate whether robotic-assisted laparoscopic surgery (RALS) is cost-effective compared to conventional laparoscopic surgery (LS) in pediatric surgery, we attempted to construct a model to perform an analysis of these two surgical approaches using Python statistical analysis software. METHODS: We selected four common complex pediatric surgical conditions (choledochal cyst, Hirschsprung's disease, vesicoureteral reflux, and congenital hydronephrosis) from three systems (pediatric hepatobiliary, gastroenterology, and urology). Models were constructed using Python statistical software to compare hospital costs and surgical outcomes for RALS and LS. In addition, we performed a preferred strategy analysis for both surgical modalities while assessing model uncertainty using one-way sensitivity analysis. RESULTS: For the four diseases, the operative time decreased sequentially. The total inpatient costs of RALS were 10,816.72, 9145.44, 8414.29, 7973.58 dollars, respectively, yielding 1.789, 1.712, 1.749, 1.792 quality adjustment life years (QALYs) over two years post-operatively. The incremental cost of RALS relative to LS for each disease was 3523.44, 3200.20, 3049.79, 3043.66 dollars, respectively, with an incremental utility of 0.060, 0.054, 0.051, 0.050 QALYs. The incremental cost-effectiveness ratios (ICERs) for RALS for each of the four diseases were 58,724.01, 59,262.95, 59,799.79, 60,873.20 dollars/QALY, all less than 100,000 dollars/QALY. The cost of robot consumables was the main incremental cost of RALS and had the most significant impact on the model. CONCLUSION: For the four pediatric surgical conditions described above, RALS has higher inpatient costs than LS, but it has better postoperative outcomes, and all four RALS treatments are cost-effective. Children with complex diseases and long operative times appear to benefit more from RALS.

TSA-PACT: a method for tissue clearing and immunofluorescence staining on zebrafish brain with improved sensitivity, specificity and stability.

For comprehensive studies of the brain structure and function, fluorescence imaging of the whole brain is essential. It requires large-scale volumetric imaging in cellular or molecular resolution, which could be quite challenging. Recent advances in tissue clearing technology (e.g. CLARITY, PACT) provide new solutions by homogenizing the refractive index of the samples to create transparency. However, it has been difficult to acquire high quality results through immunofluorescence (IF) staining on the cleared samples. To address this issue, we developed TSA-PACT, a method combining tyramide signal amplification (TSA) and PACT, to transform samples into hydrogel polymerization frameworks with covalent fluorescent biomarkers assembled. We show that TSA-PACT is able to reduce the opacity of the zebrafish brain by more than 90% with well-preserved structure. Compared to traditional method, TSA-PACT achieves approximately tenfold signal amplification and twofold improvement in signal-to-noise ratio (SNR). Moreover, both the structure and the fluorescent signal persist for at least 16 months with excellent signal retention ratio. Overall, this method improves immunofluorescence signal sensitivity, specificity and stability in the whole brain of juvenile and adult zebrafish, which is applicable for fine structural analysis, neural circuit mapping and three-dimensional cell counting.

Effects of the NF-κB Pathway Agonist IL-1ß on Non-Small Cell Lung Cancer Cell Lines.

OBJECTIVE: Canakinumab is an interleukin (IL)-1ß inhibitory antibody. Recently, a large trial of canakinumab in cardiac patients described lower lung cancer incidence in patients treated with canakinumab compared to controls. This finding is the basis for ongoing clinical trials of canakinumab in lung cancer. To address the underlying mechanism, we established lung cancer co-cultures to investigate the interactions between lung cancer cells and immunocyte macrophages as related to the expression of IL-1ß and the effect of IL-1ß on the NF-κB pathway on lung cancer cells. METHODS: Lung cancer cell lines H838 and H1975 and macrophages were mono-cultured separately as control groups. Lung cancer cell lines and macrophages were co-cultured respectively in a ratio of 5:1 under the conditions of 37°C in a humidified atmosphere of 5% CO2 for seven days. Cell culture supernatants were collected at predetermined time points, and cell morphology was observed and photographed by microscopy. IL-1ß was detected by ELISA. H838 and H1975 cells were treated with PBS or IL-1ß for 24 hours. Cells were harvested and lysed, then analyzed in a proteome profiler array. RESULTS: Cells in co-cultures initially grew well. IL-1ß was almost undetectable in lung cancer cell lines and macrophage monoculture groups but was highly expressed in co-cultures after 24h and declined at the 7th day. In the H838 and H1975 co-culture group, the lung cancer cells occupied a great majority. IL-1ß activates the NF-κB pathway on H838 and H1975 cells. CONCLUSION: Our data showed that in a lung cancer co-culture incorporating lung cancer cells and macrophages lead to a higher expression of IL-1ß than monoculture. It is possible that such dynamic changes in IL-1ß expression may also occur in vivo in response to changes in the tumor microenvironment and interactions with immune cell populations. These interactions are likely important components to be considered when studying and modeling the expression of IL-1ß as a potential therapeutic target in lung cancer.

A Bibliometric Insight of Genetic Factors in ASD: Emerging Trends and New Developments.

Autism spectrum disorder (ASD) cases have increased rapidly in recent decades, which is associated with various genetic abnormalities. To provide a better understanding of the genetic factors in ASD, we assessed the global scientific output of the related studies. A total of 2944 studies published between 1997 and 2018 were included by systematic retrieval from the Web of Science (WoS) database, whose scientific landscapes were drawn and the tendencies and research frontiers were explored through bibliometric methods. The United States has been acting as a leading explorer of the field worldwide in recent years. The rapid development of high-throughput technologies and bioinformatics transferred the research method from the traditional classic method to a big data-based pipeline. As a consequence, the focused research area and tendency were also changed, as the contribution of de novo mutations in ASD has been a research hotspot in the past several years and probably will remain one into the near future, which is consistent with the current opinions of the major etiology of ASD. Therefore, more attention and financial support should be paid to the deciphering of the de novo mutations in ASD. Meanwhile, the effective cooperation of multi-research centers and scientists in different fields should be advocated in the next step of scientific research undertaken.

Clinical analysis of prenatal ultrasound diagnosis of fetal cardiovascular malformations in the first and second trimesters of pregnancy: A CARE-compliant article.

Fetal cardiovascular malformations is widely focused and screened, but the accuracy of screening is not satisfactory. In this study, we compared the types of congenital heart malformation, accompanying diseases and fetal outcomes in the first and second trimesters of pregnancy to clarify the advantage of early screening.From January 2013 to June 2018, 230 fetuses were diagnosed with congenital heart malformations using ultrasound method in Qilu Hospital of Shandong University, and divided into 2 groups:the first trimester fetuses (group A) and the second trimester fetuses (group B). In addition, we collected and organized medical data of 347 cases diagnosed with congenital heart disease during 1998 to 2005 (group C). We compared the spectrum of congenital heart disease, associated comorbidities and outcome of fetuses diagnosed with congenital heart disease.There were differences in the types and incidence of cardiac malformations between the first and second trimesters of pregnancy. The number of cases of non-cardiac malformation, congenital heart disease with single ventricular circulation, fetal intrauterine death and premature pregnancy termination was significantly lower in the late stage (group A and group B) than that in the early stage (group C). More patients were screened for trisomy 21, 18, 13 syndromes and Turner syndrome in group A than group B (P <.001). More fetuses with a 22q11 deletion were screened in group B than group C.Early pregnancy screening using ultrasound diagnosis is very important for fetuses with congenital heart disease.

HIF-2α-ILK Is Involved in Mesenchymal Stromal Cell Angiogenesis in Multiple Myeloma Under Hypoxic Conditions.

Mesenchymal stromal cells are proven to be likely induce the angiogenic response in multiple myeloma and thus represent an enticing target for antiangiogenesis therapies for multiple myeloma. Substantial evidence indicates that angiogenesis in multiple myeloma is complex and involves direct production of angiogenic cytokines by abnormal plasma cells and these B-cell neoplasia generated pathophysiology change within the microenvironment. In this study, we demonstrated that mesenchymal stromal cells cultured with U266/Lp-1 under hypoxic conditions resulted in an increased α-smooth muscle actin expression and high productive levels of both hypoxia-inducible factor-2α and integrin-linked kinase proteins. Moreover, inhibition of hypoxia-inducible factor-2α by Small interfering RNA (siRNA) in mesenchymal stromal cells decreased the protein levels of both α-smooth muscle actin and integrin-linked kinase after mesenchymal stromal cells cultured with U266 under hypoxic conditions. We further demonstrated that transfection of integrin-linked kinase-siRNA reduced the protein level of α-smooth muscle actin and attenuated angiogenesis in vitro by decreasing the attachment of Q-dot labeled cells and secretion of angiogenic factors. In conclusion, our research showed that mesenchymal stromal cells cultured with myeloma cells under hypoxia participated in the angiogenesis of multiple myeloma, which is regulated by the hypoxia-inducible factor-2α-integrin-linked kinase pathway. Thus, targeting integrin-linked kinase may represent an effective strategy to block hypoxia-inducible factor-2α-induced angiogenesis in the treatment of multiple myeloma.

Decitibine improve the efficiency of anti-PD-1 therapy via activating the response to IFN/PD-L1 signal of lung cancer cells.

IFN-γ-induced PD-L1 expression represents the existence of tumor-specific T cells, which predicts high-response rate to anti-PD-1/L1 therapy, but loss-of-function of IFN signals (e.g., JAK mutation) induces adaptive immune resistance in patients with low-response rate. Interferon regulatory factors (IRF) are frequently epigenetic silenced in carcinogenesis, while the role of methylation in anti-PD-1/L1 therapy remains unclear. We here investigated the methylation status of IFN-γ related genes IRF1/8 and IFN-α/ß-related genes IRF3/7 in lung cancer tissues and found that only highly methylated IRF1 and 7 negatively correlated to cd274 (coding PD-L1) expression, similar to JAK mutation. Interestingly, decitibine (DAC) as methylation inhibitor could hypomethylate IRF1/7 to restore PD-L1 level. Meanwhile, IRF7 enhanced constitutive PD-L1 expression, which was independent of IFN-γ though directly promote transcription of PD-L1, leading to abrogating cytotoxic T lymphocytes (CTLs) generation which could be restored by anti-PD-L1 antibody, or siRNA-IRF7. The supplement of DAC to anti-PD-1 therapy in vivo improve the efficiency of anti-tumor with less methylated IRF1/7, more interferon-related genes expression (e.g., CXCL9) and IFN-γ/CD8+ T-cells infiltrations, suggesting that additional treatment of DAC could rescue the ability to response to IFN in lung cancer patients with anti-PD-1/L1 therapy resistance.

The loss-of-function of DNA methyltransferase 1 by siRNA impairs the growth of non-small cell lung cancer with alleviated side effects via reactivation of RASSF1A and APC in vitro and vivo.

Hypermethylation of tumor suppressor genes (TSGs) promoters by DNA methyltransferase (DNMT) can be observed in almost all cancers which represent a hallmark of carcinogenesis, including lung cancer. DNMT inhibitors (e.g.5-Aza-CR/CdR) reactivate TSGs to exert anti-cancer activity and have been applied into the clinical. However, it is cytotoxic even at low concentrations, which might be not directly related to DNA methylation. We here investigated an alternative strategy in the lung cancer therapy and aimed to estimate and compare its efficiency and side effects of knockdown of DNMT1 in vitro and in vivo. Lung cancer tissues (n=20) showed enhanced expression of DNMT1 than corresponding non-neoplastic tissues. Similar results were found in lung cancer cell lines A549 and H538. The treatment of 5-Aza-CR or knockdown of DNMT1 in vitro could inhibit the expressions of DNMT1 but restore the TSGs expressions including the Ras association domain family 1A (RASSF1A) and the adenomatous polyposis coli (APC) via the demethylation of its promoter region, which results in the decreased proliferation, increased apoptosis and impaired ability of migration. Importantly, knockdown of DNMT1 by siRNA in vivo also effectively demethylated the RASSF1A and APC promoter, elevated their expressions and limited tumor growth, which functioned like 5-Aza-CR but with alleviated side effects, suggesting that knockdown of DNMT1 might be potential strategy for the treatment of lung cancer with better tolerability.

Mesenchymal stromal cells enhance the suppressive effects ofmyeloid-derived suppressor cells of multiple myeloma.

Both mesenchymal stromal cells (MSCs) and myeloid-derived suppressor cells (MDSCs) have immunosuppressive properties, and their presence may confer a worse prognosis upon cancer patients. However, whether MSCs can enhance the immunosuppressive effects of MDSCs in MM remains unknown. We evaluated the influence of MSCs on MDSCs growth, apoptosis, and functions. Our results show that MSCs promote proliferation and inhibit apoptosis in MDSCs. Additionally, MSCs enhance the ability of MDSCs by inhibiting T-cell proliferation and IFN-γ production. Furthermore, both the mRNA and protein levels of Arg1 and NOS2 were upregulated in MDSCs. These results suggest that MSCs may exert immunomodulatory effects on MDSCs by upregulating Arg1 and NOS2.

Hypermethylation of ATP-binding cassette B1 (ABCB1) multidrug resistance 1 (MDR1) is associated with cisplatin resistance in the A549 lung adenocarcinoma cell line.

Development of multiple drug resistance has been attributed to the overexpression of the ATP-binding cassette B1 (ABCB1) gene. In this study, the major purpose was to assess the expression and methylation levels of ABCB1 in human lung adenocarcinoma and to reveal the relationship between these processes and acquisition of cisplatin (DDP) resistance in the human cancer cell line A549. Methylation and expression levels of the ABCB1 gene ABCB1 in clinical human lung tissue were assessed using bisulphite sequencing, reverse transcription real-time PCR (RT2 -PCR) and Western blot methods. Cell viability, DDP resistance and apoptosis of A549 cells were evaluated using the Cell Counting Kit-8 and fluorescence-activated cell sorter analysis. Our results showed that the onset of resistance to the cisplatin analogue, DDP, was associated with hypermethylation of the ABCB1 gene. Expression of the ABCB1 gene was enhanced at both mRNA and protein levels. Treatment with 5-Aza-C contributed to the hypomethylation of the ABCB1 gene and decreased ABCB1 protein expression in A549 cells. In conclusion, this in vitro and human tissue study of lung adenocarcinoma cells demonstrated that hypermethylation of the ABCB1 gene correlated with increased gene expression and was associated with the acquisition of resistance to the cisplatin analogue, DDP in human lung adenocarcinoma cells. Taken together, our study highlighted the connection between increased ABCB1 methylation level and upregulated expression of the gene in lung cancer. Moreover, the abnormally high expression of ABCB1 in A549 cells contributed to the development of the DDP resistance.

Reductive immobilization of chromate in water and soil using stabilized iron nanoparticles.

Laboratory batch and column experiments were conducted to investigate the feasibility of using a new class of stabilized zero-valent iron (ZVI) nanoparticles for in situ reductive immobilization of Cr(VI) in water and in a sandy loam soil. Batch kinetic tests indicated that 0.08g/L of the ZVI nanoparticles were able to rapidly reduce 34mg/L of Cr(VI) in water at an initial pseudo first-order rate constant of 0.08h(-1). The extent of Cr(VI) reduction was increased from 24% to 90% as the ZVI dosage was increased from 0.04 to 0.12g/L. The leachability of Cr preloaded in a Cr-loaded sandy soil was reduced by nearly 50% when the soil was amended with 0.08g/L of the ZVI nanoparticles in batch tests at a soil-to-solution ratio of 1g: 10mL. Column experiments indicated that the stabilized ZVI nanoparticles are highly deliverable in the soil column. When the soil column was treated with 5.7 bed volumes of 0.06g/L of the nanoparticles at pH 5.60, only 4.9% of the total Cr was eluted compared to 12% for untreated soil under otherwise identical conditions. The ZVI treatment reduced the TCLP leachability of Cr in the soil by 90%, and the California WET (Waste Extraction Test) leachability by 76%. The stabilized ZVI nanoparticles may serve as a highly soil-dispersible and effective agent for in situ reductive immobilization of chromium in soils, groundwater, or industrial wastes.

Removal of copper from contaminated soil by use of poly(amidoamine) dendrimers.

This study characterizes poly(amidoamine) (PAMAM) dendrimers of various generations and terminal functional groups for removal of copper(II) in a sandy soil. Effects of dendrimer dose, generation number, pH, terminal functional groups, and ionic strength on the removal efficiency were investigated through a series of column tests. Over 90% of copper initially sorbed in the soil was removed by use of approximately 66 bed volumes of 0.10% (w/w) of a generation 4.5 dendrimer with carboxylate terminal groups at pH 6.0. On the basis of equal equivalent dose, dendrimers of lower generation removed more copper. Lowering pH enhanced copper removal for all dendrimers tested. In contrast, types of terminal groups (carboxylate, amine, or hydroxyl) showed a modest effect on the removal efficiency. Results from a sequential extraction procedure suggested that dendrimers removed primarily exchangeable and carbonate-bound copper. The residual copper in treated soil is predominantly bound with soil organic matter (SOM), which is much less available physical-chemically or biologically. Spent dendrimers were recovered through nanofiltration with a commercially available nanofilter. Upon acid regeneration, recovered dendrimers were reused and performed as well as the virgin dendrimers. The dendrimers may be used as reusable, high-capacity extracting agents for in situ removal of heavy metals from contaminated soils.