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Meng N, Lv Y, Liu Q, Liu R, Zhao X, Wei W. Visible-light-induced three-component reaction of quinoxalin-2(1H)-ones, alkenes and CF3SO2Na leading to 3-trifluoroalkylated quinoxalin-2(1H)-ones. CHINESE CHEM LETT 2021. [DOI: 10.1016/j.cclet.2020.11.034] [Citation(s) in RCA: 65] [Impact Index Per Article: 21.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Zhao F, Meng N, Sun T, Wen J, Zhao X, Wei W. Metal-free electrochemical synthesis of α-ketoamides via decarboxylative coupling of α-keto acids with isocyanides and water. Org Chem Front 2021. [DOI: 10.1039/d1qo01351c] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
A mild and convenient electrochemical protocol has been developed for the preparation of α-ketoamides via a decarboxylative coupling reaction of α-keto acids with isocyanides and water.
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Zhu S, Meng N, Chen S, Li Y. Study of acetylated EGCG synthesis by enzymatic transesterification in organic media. ARAB J CHEM 2020. [DOI: 10.1016/j.arabjc.2020.10.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
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Wang Z, Wang Q, Xu G, Meng N, Huang X, Jiang Z, Chen C, Zhang Y, Chen J, Li A, Li N, Zou X, Zhou J, Ding Q, Wang S. The long noncoding RNA CRAL reverses cisplatin resistance via the miR-505/CYLD/AKT axis in human gastric cancer cells. RNA Biol 2020; 17:1576-1589. [PMID: 31885317 PMCID: PMC7567514 DOI: 10.1080/15476286.2019.1709296] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 12/10/2019] [Accepted: 12/12/2019] [Indexed: 12/24/2022] Open
Abstract
Emerging evidence has suggested that long noncoding RNAs (lncRNAs) play an essential role in the tumorigenesis of multiple types of cancer including gastric cancer (GC). However, the potential biological roles and regulatory mechanisms of lncRNA in response to cisplatin, which may be involved in cisplatin resistance, have not been fully elucidated. In this study, we identified a novel lncRNA, cisplatin resistance-associated lncRNA (CRAL), that was downregulated in cisplatin-resistant GC cells, impaired cisplatin-induced DNA damage and cell apoptosis and thus contributed to cisplatin resistance in GC cells. Furthermore, the results indicated that CRAL mainly resided in the cytoplasm and could sponge endogenous miR-505 to upregulate cylindromatosis (CYLD) expression, which further suppressed AKT activation and led to an increase in the sensitivity of gastric cancer cells to cisplatin in vitro and in preclinical models. Moreover, a specific small molecule inhibitor of AKT activation, MK2206, effectively reversed the cisplatin resistance in GC caused by CRAL deficiency. In conclusion, we provide the first evidence that a novel lncRNA, CRAL, could function as a competing endogenous RNA (ceRNA) to reverse GC cisplatin resistance via the miR-505/CYLD/AKT axis, which suggests that CRAL could be considered a potential predictive biomarker and therapeutic target for cisplatin resistance in gastric cancer.
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Zou J, Li W, Meng N, Jiang J, Wu C, Lei TC, Sroka R, Huang Z. Evaluation of lensed fibers used in photodynamic therapy (PDT). Photodiagnosis Photodyn Ther 2020; 31:101924. [DOI: 10.1016/j.pdpdt.2020.101924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Revised: 07/10/2020] [Accepted: 07/13/2020] [Indexed: 10/23/2022]
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Guo Q, Duan Y, Meng N, Liu Y, Luo G. The N-terminus of Sec3 is required for cell wall integrity in yeast. Biochimie 2020; 177:30-39. [PMID: 32800898 DOI: 10.1016/j.biochi.2020.07.023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 07/28/2020] [Accepted: 07/31/2020] [Indexed: 10/23/2022]
Abstract
The cell wall is essential for cell viability and pathogenesis of fungi. It was previously shown that the exocytosis landmark Sec3 is an effector of the cell wall integrity (CWI) master regulator Rho1 GTPase. However, disruption of the interaction between Sec3 and Rho1 did not inhibit exocytic secretion and cell growth. The physiological role of Sec3 in fungi is unclear. We have examined the growth, cell wall sensitivity, exocyst localization, and exocytic secretion of Sec3-binding deficient rho1 mutants and Rho1-binding deficient sec3 mutants. We found that the Sec3 N-terminal deletion mutant was defective in cell wall integrity. The cells harboring binding mutation between Rho1 and Sec3 N-terminus were sensitive to cell wall antagonists. We also found that the polarized localization of exocyst subunits was disrupted in these mutants. Our study demonstrates that the N-terminus of Sec3 mediates cell wall integrity in yeast. Pathogenic fungi may use similar regulatory mechanisms because components of the exocytic signaling pathways are conserved.
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Liu W, Wang J, Meng N, Wang X, Ge D. MiR-195 inhibits proliferation of oral squamous cell carcinoma cells through regulating Smad7. Panminerva Med 2020:S0031-0808.20.04009-4. [PMID: 32759899 DOI: 10.23736/s0031-0808.20.04009-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Meng N, Liu R, Wong M, Liao J, Feng C, Li X. The association between patient-reported readiness for hospital discharge and outcomes in patients diagnosed with anxiety disorders: A prospective and observational study. J Psychiatr Ment Health Nurs 2020; 27:380-392. [PMID: 31943521 DOI: 10.1111/jpm.12592] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 01/08/2020] [Accepted: 01/10/2020] [Indexed: 02/05/2023]
Abstract
WHAT IS KNOWN ON THE SUBJECT?: Readiness for hospital discharge (RHD) has been an important topic for nurses. RHD can be measured by the Readiness for Hospital Discharge Scale (RHDS), including 4 subscales: personal status, knowledge, coping ability and expected support. There are few studies that focus on RHD in patients diagnosed with mental disorders. WHAT DOES THE PAPER ADD TO EXISTING KNOWLEDGE?: Improving patient-reported RHD can decrease the risks of unscheduled post-discharge clinic visits, readmission and poor quality of life (QOL) in patients diagnosed with anxiety disorders. Improving patient-reported personal status can decrease the risk of poor QOL in patients diagnosed with anxiety disorders. Improving patient-reported knowledge can decrease the risks of unscheduled post-discharge clinic visits and readmission in patients diagnosed with anxiety disorders. Improving patient-reported expected support can decrease the risk of unscheduled post-discharge clinic visits in patients diagnosed with anxiety disorders. Improving the methods of discharge teaching and anxiety severity can enhance RHD in patients diagnosed with anxiety disorders. WHAT ARE THE IMPLICATIONS FOR PRACTICE?: Nurses could enhance patient-reported RHD to reduce unscheduled post-discharge medical resource utilization or improve QOL by facilitating knowledge acquisition and skill development and improving social support systems. Nurse managers could add RHD assessment to patients' discharge process and train nurses in the methods of discharge education. Nurses could advance their methods of discharge education, such as listening to and answering patients' questions, choosing a convenient time and engaging in online education. ABSTRACT: Introduction The association between readiness for hospital discharge (RHD) and post-discharge outcomes remains unclear in individuals with anxiety disorders. Aim To explore the factors of RHD and the effect of patient-reported RHD on post-discharge outcomes. Method In the observational study, 373 patients diagnosed with anxiety disorders completed the self-administered Readiness for Hospital Discharge Scale (RHDS) on discharge. After 30 days, phone interviews were conducted to collect data on post-discharge outcomes, including self-reported unscheduled medical service utilization, symptom severity and quality of life (QOL). Multiple logistic regression models were built to explore the relationships among sociodemographic characteristics, the RHDS and its subscales, and post-discharge outcomes. Results The unscheduled clinic visits were significantly associated with low RHD, knowledge and expected support. Readmission was significantly associated with low RHD and knowledge. Poor QOL was significantly associated with low RHD and personal status. Delivery, received content and anxiety severity were the predictors of RHD. Discussion Improved RHD is associated with fewer unscheduled clinic visits and readmissions and better QOL. Enhancing discharge education can improve RHD. Implications for practice Nurses should enhance patient-reported RHD to improve post-discharge outcomes by advancing the quality of discharge education in patients diagnosed with anxiety disorders.
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Jiang P, Zhang X, Jiang W, Meng N, Aili A, Wang J. Analysis of long-term outcome of image-guided volumetric modulated arc therapy (VMAT) for primary malignant tumor of the cervical spine. Cancer Biol Ther 2020; 21:623-628. [PMID: 32298199 DOI: 10.1080/15384047.2020.1743149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
Abstract
OBJECTIVE Retrospective analysis of the long-term clinical outcome and acute toxicity of the primary malignant tumor of cervical spine receiving CBCT image-guided VMAT. METHODS Thirty patients with primary malignant tumor of the cervical spine included in our center, from December 2013 to January 2016, 28 patients were retrospectively studied. The prescription dosage 95% PTV volume dose was 44 Gy, 2.0 Gy/fraction, and a total of 22 times. The median PGTV synchronized volume dose was 60 Gy (45-62.1 Gy), median 2.5 Gy (2-2.7 Gy)/fraction. In volumetric modulated, two arc volumetric modulated arc therapy (VMAT) was used, with spinal cord dosage DMAX< 45 Gy. Early response rate and acute toxicities were analyzed. RESULT The follow-up duration was 6-76 months (median 53 months). At the end of follow-up of June 1, 2019, 78.6% (22/28) patients were still alive. 3 and 5-y local control rates were 67.3% and 56.5% while 3 and 5-y OS were both 78.6% in the whole group of patients, respectively. Fourteen patients with chordoma 5-y local control rates and OS were 57.1% and 85.7%, respectively. Nine patients with giant-cell tumor of bone had a 5-y local control rate and OS were 77.8% and 85.7%, respectively. The response rate for moderate pain or above was 80% (8/10). Eleven patients (39.3%) suffered from grade 1 acute skin toxicity. Twenty-four patients (85.7%) had grade 1/2 mucositis. No radiation-induced spinal cord injury was found. CONCLUSION The image-guided VMAT for primary malignant tumor of the cervical spine provided a satisfactory long-term local control rate.
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Liu S, Chen M, Cao X, Li G, Zhang D, Li M, Meng N, Yin J, Yan B. Chromium (VI) removal from water using cetylpyridinium chloride (CPC)-modified montmorillonite. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2020.116732] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Liao W, Lin S, Meng N, Tin H, Tsai S, Huang Y. 1134 Light Exposure At Daytime On Sleep Quality In Stroke Patient During Rehabilitation. Sleep 2020. [DOI: 10.1093/sleep/zsaa056.1128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Introduction
Lights maintain the day and night rhythm to set patients’ “wake-up cycle” and to stabilize their physiological functions, which may be expected to improve sleep. This study was aimed to investigate the relations between sleep quality and daytime light exposure in stroke patient during rehabilitation.
Methods
A cross-sectional study design was adopted and 120 stroke patients were recruited from rehabilitation wards of two medical centers and 116 patients completed this study. Research instruments including the Pittsburgh Sleep Quality Index, Epworth Sleepiness Scale, Sleep Log, and Somnowatch (Germany) for actigaphy sleep and light were used to collect data and urinary melatonin concentration were measured.
Results
47.4% of the patients had poor sleep quality (PSQI>5), 74.1% had actigraphic sleep efficiency less than 85%, and 90.5% waked more than 30 minutes after sleep onset. The average exposure time at lower level light (≤149 lux) were 288.8 minutes, accounting for 48% of the day (8:00-18:00). Compared to lower light exposure group (less than 319.5 min at >150 lux), those who exposed to higher level light (more than 319.5 min at >150 lux) had increased 52.1 minutes in actigraphic total sleep time (TST, t=-2.134, p=0.035), increased 8% in actigraphic sleep efficiency (SE, t=-2.053, p=0.042), and decreased 41.1 minutes in actigraphic wake-after-sleep-onset (WASO, t=2.209, p=0.029). Urinary melatonin concentration increased 52.7 pg/ml, but not statistically significant (t=-1.277, p=0.205). Result of multiple regression analysis showed that after controlling for age, gender, post-stroke complications, and environmental interference, time of bright light exposure significantly affected subjective sleep satisfaction (p=0.014), TST (p=0.04), SE (p=0.041), and WASO (p=0.026).
Conclusion
Increasing time of bright illumination (≥150 lux) during daytime may improve sleep quality. Results of this study provide empirical references for non-drug intervention to improve sleep quality in patients with stroke.
Support
This study was supported by the Ministry of Science and Technology, MOST 105-2628-B-040 -005 -MY2.
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Meng N, Wang L, Liu Q, Li Q, Lv Y, Yue H, Wang X, Wei W. Metal-Free Trifluoroalkylation of Quinoxalin-2(1H)-ones with Unactivated Alkenes and Langlois’ Reagent. J Org Chem 2020; 85:6888-6896. [DOI: 10.1021/acs.joc.9b03505] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Hu JX, Gong YN, Jiang XD, Jiang L, Zhuang HQ, Meng N, Liu XG, Wei F, Liu ZJ. Local Tumor Control for Metastatic Epidural Spinal Cord Compression Following Separation Surgery with Adjuvant CyberKnife Stereotactic Radiotherapy or Image-Guided Intensity-Modulated Radiotherapy. World Neurosurg 2020; 141:e76-e85. [PMID: 32360927 DOI: 10.1016/j.wneu.2020.04.183] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 04/22/2020] [Accepted: 04/23/2020] [Indexed: 11/19/2022]
Abstract
BACKGROUND We sought to compare local tumor control after conventionally fractionated image-guided intensity-modulated radiotherapy (IMRT) versus adjuvant CyberKnife stereotactic body radiotherapy (SBRT) in patients who underwent separation surgery for metastatic epidural spinal cord compression (MESCC). METHODS We retrospectively reviewed patients with MESCC who were treated at our hospital. The Kaplan-Meier method was used to estimate local progression and overall survival. RESULTS Fifty-six patients with MESCC underwent separation surgery between 2013 and 2018, among whom 6 were lost to follow-up, 24 received conventionally fractionated image-guided IMRT, and 26 were treated with CyberKnife SBRT. The median follow-up was 16.5 months (range, 2.1-47.5 months). Eleven patients experienced local failure including 9 and 2 from the IMRT and SBRT groups, respectively. The local progression-free survival rates were significantly higher in the SBRT group than IMRT group at 6 months (95.5% vs. 82.0%), 1 year (90.9% vs. 71.8%), and 2 years (90.9% vs. 57.6%) (P = 0.035). Multivariate Cox proportional hazards regression analysis identified radiotherapy method (P = 0.034) and receipt of preoperative radiotherapy (P = 0.047) as significant predictors of local control, while visceral metastasis (P = 0.048) and high-malignancy primary tumor type (P = 0.002) were negative predictors of overall survival. Moreover, postoperative SBRT was noninferior to IMRT in terms of pain control, adverse effects, and performance in treating irradiated spinal metastases. CONCLUSIONS Hybrid surgery-radiosurgery therapy is a safe and effective treatment option for patients with MESCC. SBRT provided higher local control rates compared with IMRT. Thus postoperative SBRT should be considered for patients expected to have relatively long survival.
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Meng N, Shi ZM. [Effect of herb-partitioned moxibustion at fanwei point on plasma motilin and serum gastrin in patients of diabetic gastroparesis]. ZHONGGUO ZHEN JIU = CHINESE ACUPUNCTURE & MOXIBUSTION 2020; 40:361-4. [PMID: 32275362 DOI: 10.13703/j.0255-2930.20190415-0001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECTIVE To explore the clinical therapeutic effect of herb-partitioned moxibustion at fanwei point in patients of diabetic gastroparesis differentiated as spleen and stomach deficiency and retention of turbid dampness as well as its effect mechanism. METHODS A total of 134 patients with diabetic gastroparesis were randomized into an observation group and a control group, 67 cases in each one. In the observation group, herb-partitioned moxibustion at fanwei point was adopted, 40 min each time, once a day for 5 times a week. In the control group, itopride hydrochloride tablets were prescribed for oral administration, 50 mg each time, three times a day. A total of 6 weeks of treatment was required in the two groups. Before and after treatment, the gastroparesis cardinal symptom index (GCSI) scores, 4-hour gastric emptying rate, TCM symptom score, as well as the levels of plasma motilin and serum gastrin were observed in the patients of the two groups. Additionally, the clinical therapeutic effect was evaluated in the two groups. RESULTS After treatment, the score of every item of GCSI, TCM symptom scores and the levels of plasma motilin and serum gastrin were all reduced as compared with those before treatment in the patients of the two groups (P<0.05), and those in the observation group were lower than the control group (P<0.05). Regarding 4-hour gastric emptying rates, which were increased as compared with those before treatment in the two group (P<0.05), and the rate in the observation group was higher remarkably than that in the control group (P<0.05). The total effective rate was 92.5% (62/67) in the observation group, higher than 74.6% (50/67) in the control group (P<0.05). CONCLUSION Herb-partitioned moxibustion at fanwei point relieves the clinical symptoms in the patients with diabetic gastroparesis and increases the gastric emptying rate, which is probably related to the regulation of the levels of plasma motilin and serum gastrin.
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Guo Q, Zhang T, Meng N, Duan Y, Meng Y, Sun D, Liu Y, Luo G. Sphingolipids are required for exocyst polarity and exocytic secretion in Saccharomyces cerevisiae. Cell Biosci 2020; 10:53. [PMID: 32257111 PMCID: PMC7106735 DOI: 10.1186/s13578-020-00406-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2020] [Accepted: 03/10/2020] [Indexed: 11/13/2022] Open
Abstract
Background Exocytosis is a process by which vesicles are transported to and fused with specific areas of the plasma membrane. Although several studies have shown that sphingolipids are the main components of exocytic compartments, whether they control exocytosis process is unclear. Results Here, we have investigated the role of sphingolipids in exocytosis by reducing the activity of the serine palmitoyl-transferase (SPT), which catalyzes the first step in sphingolipid synthesis in endoplasmic reticulum. We found that the exocyst polarity and exocytic secretion were impaired in lcb1-100 mutant cells and in wild type cells treated with myriocin, a chemical which can specifically inhibit SPT enzyme activity, suggesting that sphingolipids controls exocytic secretion. This speculation was further confirmed by immuno-fluorescence and electron microscopy results that small secretory vesicles were accumulated in lcb1-100 mutant cells. Conclusions Taken together, our results suggest that sphingolipids are required for exocytosis. Mammals may use similar regulatory mechanisms because components of the exocytic secretion apparatus and signaling pathways are conserved.
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Meng N, Ji NN, Zhou Z, Qian Y, Tang Y, Yang K, Chen B, Zhang YM. The role of SOCS3 in the hypothalamic paraventricular nucleus in rat model of inflammatory pain. J Inflamm (Lond) 2020; 17:12. [PMID: 32127783 PMCID: PMC7047413 DOI: 10.1186/s12950-020-00241-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Accepted: 02/18/2020] [Indexed: 11/10/2022] Open
Abstract
Background Inflammatory molecular signals are modulated by a variety of intracellular transduction pathways, the activation of which may induce and amplify the spread of inflammatory response. Suppresser of cytokine signaling 3 (SOCS3) is an established negative feedback regulation transcription factor associated with tumor, diabetes mellitus, inflammation and anaphylaxis. Herein, we investigated whether SOCS3 in the paraventricular nucleus (PVN) can attenuate pro-inflammatory responses, and thereby relieve the inflammatory pain. Methods Adeno-associated virus (AAV) overexpressing SOCS3 was pre-injected into the PVN. Three weeks later, rat model of chronic inflammatory pain was established via subcutaneous injection of complete Freund's adjuvant (CFA) into the plantar center of hind paws. The therapeutic effect of SOCS3 was tested by the measurement of thermal and mechanical allodynia. In mechanistic study, the protein level of SOCS3 was evaluated by Western blotting, and the expression of c-fos and Iba-1 were assessed by immunofluorescent staining. Results Inflammatory pain was associated with upregulated interleukin 6 (IL-6) and SOCS3 in PVN in the acute phase. Thermal hyperalgesia can be relieved by intra-PVN injection of IL-6 neutralizing antibody (NA). Meanwhile, the upregulated c-fos and microglial activation was reversed. Furthermore, SOCS3 expression in PVN was downregulated in the chronic phase. Intra-PVN injection of AAV overexpressing SOCS3 suppressed the activation of neurons and attenuated thermal hyperalgesia and mechanical allodynia. Conclusion Inhibition of IL-6 signaling attenuated inflammatory hyperalgesia in the acute phase. SOCS3 overexpression in the PVN attenuated inflammatory pain in the chronic phase via suppression of neuronal activation.
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Sun B, Xi Z, Wu F, Song S, Huang X, Chu X, Wang Z, Wang Y, Zhang Q, Meng N, Zhou N, Shen J. Quaternized Chitosan-Coated Montmorillonite Interior Antimicrobial Metal-Antibiotic in Situ Coordination Complexation for Mixed Infections of Wounds. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:15275-15286. [PMID: 31665888 DOI: 10.1021/acs.langmuir.9b02821] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Conventional drug delivery systems for natural clay materials still face critical challenges in their practical application, including multiple bacterial infections, combined infection of bacteria and fungi, and low sterilization efficiency. In this work, we address these challenges using the multifunctional montmorillonite nanosheet-based (MMT-based) drug nanoplatform, which involves the antibiotic 5-fluorocytosine (5-FC), antibacterial metal copper ions, and quaternized chitosan (QCS). Composite material QCS/MMT/5-FCCu can can strongly inhibit Staphylococcus aureus (a typical Gram-positive bacterium), Escherichia coli (a typical Gram-negative bacterium), and Candida albicans (a fungus) because 5-FC coordinates with copper ions in situ and due to the deposition of QCS. The subsequent drug release behavior of 5-FCCu was studied, and the results show an initial high concentration kills microorganisms and long-acting sustained release inhibition. Moreover, in vivo wound experiments and toxicity experiments show the promotion of wound healing and excellent biocompatibility. As a demonstration of the utility of the latter, we have shown that the MMT-based smart platform can be used for the treatment of mixed infections of wounds.
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Meng Y, Wang Y, Lou H, Wang K, Meng N, Zhang L, Wang C. Specific immunoglobulin E in nasal secretions for the diagnosis of local allergic rhinitis. Rhinology 2019; 57:313-320. [PMID: 31129685 DOI: 10.4193/rhin18.292] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND The diagnostic value of serum specific Immunoglobulin E (sIgE) and nasal allergen provocation test (NAPT) has been well investigated in local allergic rhinitis (LAR). We hypothesized that nasal local sIgE could be used for the diagnosis of LAR instead of NAPT. METHODS This was a prospective single center study. Overall, 212 chronic rhinitis patients were screened, of whom 73 were recruited based on negative findings for serum IgE and positive findings for local eosinophils. Ten healthy subjects were also recruited as controls. All participants completed questionnaires at recruitment to record their demographic data, nasal symptom severity, and physician-diagnosed comorbid asthma. Symptom severity was recorded using a visual analogue scale (VAS) of 10 cm and allergic status was assessed by serum sIgE. Nasal secretions were collected for analysis of local sIgE and eosinophils, and NAPT was performed for confirmation of LAR. RESULTS Overall, 14 patients demonstrated positive local sIgE results. Twelve of these patients had significantly higher local sIgE levels compared to controls, and also demonstrated positive NAPT results. The VAS scores, nasal airway resistance measured by active rhinomanometry, and the levels of local sIgE, ECP, histamine and leukotriene C4 were significantly increased from baseline values following NAPT. Sensitivity, specificity, and diagnostic accuracy of local sIgE for diagnosis of LAR were 91.7% respectively. CONCLUSIONS The measurement of local sIgE levels in nasal secretion is a reliable and effective diagnostic method for LAR.
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Bao P, Yue H, Meng N, Zhao X, Li J, Wei W. Copper-Catalyzed Three-Component Reaction of Alkynes, TMSN3, and Ethers: Regiocontrollable Synthesis of N1- and N2-Oxyalkylated 1,2,3-Triazoles. Org Lett 2019; 21:7218-7222. [DOI: 10.1021/acs.orglett.9b02295] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Bao P, Meng N, Lv Y, Yue H, Li JS, Wei W. Selective assembly of N1- and N2-alkylated 1,2,3-triazoles via copper-catalyzed decarboxylative cycloaddition of alkynyl carboxylic acids with ethers and azidotrimethylsilane. Org Chem Front 2019. [DOI: 10.1039/c9qo01277j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
An efficient and regiocontrolled method for the synthesis of various N1- and N2 alkylated 1,2,3-triazoles via copper-catalyzed decarboxylative cycloaddition of alkynyl carboxylic acids with ethers and azidotrimethylsilane.
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Zhao W, Liu H, Meng N, Jian M, Wang H, Zhang X. Graphene oxide incorporated thin film nanocomposite membrane at low concentration monomers. J Memb Sci 2018. [DOI: 10.1016/j.memsci.2018.08.047] [Citation(s) in RCA: 83] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Wang B, Meng N, Zhuang H, Han S, Yang S, Jiang L, Wei F, Liu X, Liu Z. The Role of Radiotherapy and Surgery in the Management of Aggressive Vertebral Hemangioma: A Retrospective Study of 20 Patients. Med Sci Monit 2018; 24:6840-6850. [PMID: 30259906 PMCID: PMC6180950 DOI: 10.12659/msm.910439] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Background Vertebral hemangioma is usually a benign and asymptomatic tumor of blood vessels, but can be aggressive (symptomatic) with expansion, pain, and spinal cord compression. The aim of this study was to review the effects of radiotherapy, surgery, and other treatment approaches in patients with aggressive vertebral hemangioma. Material/Methods Retrospective clinical review included 20 patients who underwent radiotherapy as their first-line treatment for aggressive vertebral hemangioma with mild or slowly developing neurological deficit. External radiation was divided into 20–25 fractions with a total dose of 40–50 Gy. Minimum clinical follow-up after treatment was 20 months. Results The 20 patients included eight men and 12 women (mean age, 46.6 years), with aggressive vertebral hemangioma located in the cervical, thoracic, and lumbar vertebrae in four, 14, and two patients, respectively. Following radiotherapy treatment, 65.0% of patients (13/20) were symptom-free, without recurrence or malignant transformation at the time of last clinical follow-up (average, 75.2 months). Due to minor post-radiation vertebral re-ossification, two of the 13 patients who were initially symptom-free after radiotherapy requested percutaneous vertebroplasty. A further seven patients required surgery after radiotherapy, due to increasing neurological deficit in three patients, and persistent neurological deficit in four patients. At the last follow-up (average, 63.6 months), six patients were symptom-free, and one patient still had slight residual symptoms. Conclusions Radiotherapy was a safe and effective treatment choice for aggressive vertebral hemangioma, but in case with severe spinal cord compression and neurological deficit, surgical intervention was required.
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Wang B, Han SB, Jiang L, Liu XG, Yang SM, Meng N, Wei F, Liu ZJ. Intraoperative vertebroplasty during surgical decompression and instrumentation for aggressive vertebral hemangiomas: a retrospective study of 39 patients and review of the literature. Spine J 2018; 18:1128-1135. [PMID: 29154998 DOI: 10.1016/j.spinee.2017.11.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/23/2017] [Revised: 10/10/2017] [Accepted: 11/02/2017] [Indexed: 02/09/2023]
Abstract
BACKGROUND CONTEXT Aggressive (Enneking stage 3, S3) vertebral hemangiomas (VHs) are rare, which might require surgery. However, the choice of surgery for S3 VHs remains controversial because of the rarity of these lesions. PURPOSE We reported our experience of treating S3 VHs, and evaluated the effectiveness and safety of intraoperative vertebroplasty during decompression surgery for S3 VHs. STUDY DESIGN This is a retrospective study. PATIENT SAMPLE Thirty-nine patients with a definitive pathologic diagnosis of aggressive VHs who underwent primary decompression surgery in our department were included in this study. OUTCOME MEASURES Basic data such as surgical procedure, surgical duration, estimated blood loss during surgery, and pathology were collected. The modified Frankel grade was used to evaluate neurologic function. Enneking staging was based on radiological findings. METHODS We retrospectively examined aggressive VHs with neurologic deficits. Surgery was indicated if the neurologic deficit was severe or developed quickly or if radiotherapy was ineffective. Decompression surgery was performed. Intraoperative vertebroplasty during posterior decompression has been used since 2009. If contrast-enhanced computed tomography (CT) revealed a residual lesion, we recommended adjuvant radiotherapy with 40-50 Gy to prevent recurrence. Patients' basic and surgical information was collected. The minimum follow-up duration was 18 months. This study was partially funded by Peking University Third Hospital, Grant no. Y71508-01. RESULTS Average age of the 39 patients with S3 VHs who underwent primary decompression surgery was 46.2 (range, 10-69) years. All patients had neurologic deficits caused by aggressive VHs. Aggressive VH lesions were located in the cervical, thoracic, and lumbar spine in 2, 32, and 5 patients, respectively. The decompression-alone group had 17 patients, and the decompression plus intraoperative vertebroplasty group had 22. There were no statistically significant intergroup differences in preoperative information (p>.05). The average estimated blood losses were 1,764.7 mL (range, 500-4,000 mL) and 1,068.2 mL (range, 300-3,000 mL) in the decompression-alone group and decompression plus vertebroplasty group, respectively (p=.017). One patient who underwent primary decompression alone without adjuvant radiotherapy experienced recurrence after the first decompression. The average follow-up was 50.2 (range, 18-134) months, and no cases of recurrence were observed at the last follow-up. CONCLUSIONS Our results suggest that posterior decompression effectively provides symptom relief in patients with aggressive (S3) VHs with severe spinal cord compression. Intraoperative vertebroplasty is a safe and effective method for minimizing blood loss during surgery, whereas adjuvant radiotherapy or vertebroplasty helps in minimizing recurrence after decompression.
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Ouyang HQ, Jiang L, Liu XG, Wei F, Yang SM, Meng N, Jiang P, Yu M, Wu FL, Dang L, Zhou H, Zhang H, Liu ZJ. Recurrence Factors in Giant Cell Tumors of the Spine. Chin Med J (Engl) 2018. [PMID: 28639571 PMCID: PMC5494919 DOI: 10.4103/0366-6999.208239] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Background: Giant cell tumors (GCTs) are benign, locally aggressive tumors. We examined the rate of local recurrence of spinal GCTs and sought to identify recurrence factors in patients who underwent surgery. Methods: Between 1995 and 2014, 94 mobile spine GCT patients were treated at our hospital, comprising 43 male and 51 female patients with an average age of 33.4 years. Piecemeal intralesional spondylectomy and total en bloc spondylectomy (TES) were performed. Radiotherapy was suggested for recurrent or residual GCT cases. Since denosumab was not available before 2014 in our country, only interferon and/or zoledronic acid was suggested. Results: Of the 94 patients, four underwent conservative treatment and 90 underwent operations. Seventy-five patients (79.8%) were followed up for a minimum of 24 months or until death. The median follow-up duration was 75.3 months. The overall recurrence rate was 37.3%. Ten patients (13.3%) died before the last follow-up (median: 18.5 months). Two patients (2.6%) developed osteogenic sarcoma. The local recurrence rate was 80.0% (24/30) in patients who underwent intralesional curettage, 8.8% (3/34) in patients who underwent extracapsular piecemeal spondylectomy, and 0 (0/9) in patients who underwent TES. The risk factors for local recurrence were lesions located in the cervical spine (P = 0.049), intralesional curettage (P < 0.001), repeated surgeries (P = 0.014), and malignancy (P < 0.001). Malignant transformation was a significant risk factor for death (P < 0.001). Conclusions: Cervical spinal tumors, curettage, and nonintact tumors were risk factors for local recurrence. Intralesional curettage and malignancy were the most important significant factors for local recurrence and death, respectively.
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Sun HT, Yang RJ, Jiang P, Jiang WJ, Li JN, Meng N, Wang JJ. [Dosimetric analysis of volumetric modulated arc therapy and intensity modulated radiotherapy for patients undergone breast-conserving operation]. BEIJING DA XUE XUE BAO. YI XUE BAN = JOURNAL OF PEKING UNIVERSITY. HEALTH SCIENCES 2018; 50:188-192. [PMID: 29483745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
OBJECTIVE To compare the dosimetric differences between volumetric modulated arc therapy and intensity modulated radiotherapy for breast cancer patients after breast-conserving surgery. METHODS Ten patients who received radiotherapy after breast-conserving surgery were selected. Eclipse planning system was used to design volumetric rotating intensity-modulated (2F-RapidArc) and two field intensity-modulated radiation therapy (2F-IMRT) planning for each patient. 2F-RapidArc plans were made using two partial arcs with gantry rotation from 287°-293° to 152°-162°, and 0° to 90 ° was avoidance sector. The gantry angle of 2F-IMRT were 301°-311° and 125°-135°. The prescription dose was 46 Gy/23 fractions. All plans required 95% of the target volume receiving the prescription dose. The dose distribution of the target, organs at risk, machine unit (MU) and treatment time were compared. RESULTS 2F-RapidArc and 2F-IMRT plans' uniformity index was 1.12±0.02 and 1.11±0.03 (P=0.282), respectively; conformal index was 0.80±0.03 and 0.65±0.04 (P<0.001), respectively. V110 of plan target volume was 20.98%±14.47% and 10.43%±10.49% (P=0.030), respectively. Compared with the 2F-IMRT, 2F-RapidArc plans had a higher dosimetric parameters for left lung: V5 (48.06%±17.32% vs. 24.23%±6.56%,P=0.001), V10 (28.89±9.28 vs.17.07±4.78%,P=0.004), Dmean [(9.70±2.14) Gy vs. (6.86±1.77) Gy, P=0.002], increased the double lung: V5 (22.85%±7.55% vs. 11.01%± 2.95%,P=0.001), V10 (13.16%±4.33% vs. 7.76%± 2.16%, P=0.006), Dmean [(4.66±0.95) Gy vs. (3.17±0.82) Gy, P=0.001], reduced the left lung: V40 (3.58%±1.46% vs. 6.19%±3.04%, P=0.006), reduced the double lung: V40 (1.61%±0.64% vs. 2.81%± 1.39%,P=0.005), increased cardiac: V5 (39.3%±17.19% vs. 8.79%±4.24%, P<0.001), V10 (21.31%±13.8% vs. 5.73%±3.42%, P=0.002), V20 (7.80%±6.08% vs. 4.05%±2.85%,P=0.018), Dmean [(0.64±0.25) Gy vs. (0.29±1.39) Gy,P<0.001],reduced the heart: V40(0.50%±0.40% vs. 1.86%±1.94%,P=0.037),increased the contralateral breast Dmean [(1.63±1.26) Gy vs. (0.09±0.05) Gy, P=0.004]. Compared with 2F-IMRTplan, 2F-RapidArc increased the treatment time [(132.9±7.2) s vs. (140.3±11.6) s, P=0.030]. Both the machine units were almost the same [(467.0±30.4) MU vs. (494.7±44.9) MU, P=0.094]. CONCLUSION Both 2F-RapidArc and 2F-IMRT plans could reach the clinical requirements. 2F-RapidArc had a better conformal index, reduced the high dose area, but increased the low dose regions of the lung, heart, body area, and increased the average dose of the contralateral breast. The treatment time of 2F-RapidArc was longer than that of 2F-IMRT, and the MU of 2F-RapidArc and 2F-IMRT plans were almost the same.
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