Effect of High-Concentration Uric Acid on Nitric Oxide / 中国医学科学院学报

Uric acid (UA) is the final product of purine metabolism in human body,and its metabolic disorder will induce hyperuricemia (HUA).The occurrence and development of HUA are associated with a variety of pathological mechanisms such as oxidative stress injury,activation of inflammatory cytokines,and activation of renin-angiotensin-aldosterone system.These mechanisms directly or indirectly affect the bioavailability of endogenous nitric oxide (NO).The decrease in NO bioavailability is common in the diseases with high concentration of UA as an independent risk factor.In this review,we summarize the mechanisms by which high concentrations of UA affect the endogenous NO bioavailability,with a focus on the mechanisms of high-concentration UA in decreasing the synthesis and/or increasing the consumption of NO.This review aims to provide references for alleviating the multisystem symptoms and improving the prognosis of HUA,and lay a theoretical foundation for in-depth study of the correlations between HUA and other metabolic diseases.

Research progress on genetic model of mouse with glaucoma / 国际眼科杂志(Guoji Yanke Zazhi)

Glaucoma, currently the world's first irreversible blindness, is a complex multifactorial disease with a genetic predisposition, and pathologically elevated intraocular pressure is its risk factor. The pathogenesis of glaucoma is not fully understood, and most existing studies are based on animal models, with mice as the main research object, and the pathological damage process of glaucoma is reconstructed through experimental induction means or transgenic manipulation to further investigate the relevant pathogenesis and pathological changes. The technique of experimentally induced construction of glaucoma mouse models has been studied by many scholars and is gradually becoming mature. And as research in molecular biology and genetics has advanced, more and more studies have focused on the disease genes associated with glaucoma, and transgenic mouse models have become a hot topic in recent years. In contrast to experimental manipulation to control a single factor, gene editing is better able to simulate the complex process of disease pathogenesis. This paper focuses on providing a more complete direction and strategy for model selection in the future research by describing the progress of research on relevant transgenic mouse model of glaucoma.

Effects of Rho-associated coiled-coil-forming kinase inhibitor Y27632 on mouse preantral follicles development in vitro / 解剖学报

Objective To investigate the effects of Rho-associated coiled-coil-forming kinase (ROCK) inhibitor Y27632 on the development of mouse preantral follicles in vitro. Methods The ovaries of 12.5-day-old mice were collected and single preantral follicle was isolated by mechanical method to culture Nunclon Sphera 96-well U-bottom 3D cell culture plate in vitro. Set up a control group and treated group containing Y27632, and evaluate the overall development of the follicles through follicular morphology, follicle diameter, the number of mature follicles, and changes in oocyte spindles. The expression of oocytes [bone morphogenetic protein 15(BMP 15), growth differentiation factor 9(GDF9)], granulosa cells [follicle stimulating hormone receptor (FSHR)] and apoptosis related genes (Bad, Bax and Caspase-3) were also assessed by the Real-time PCR technique. Meanwhile, the follicle viability was detected by follicular activity test during follicular development. Results Rock inhibitor Y27632 had no significant effect on the growth diameter and basic development indicators (follicle survival rate, cavity formation rate and maturation rate) (P>0.05). And abnormal spindle assembly occurred during follicle development in the control group. After 8 days of culture, compared with the control group, the granulosa cell-specific gene FSHR was up-regulated in the experimental group; As well as the oocyte-specific genes BMP 15 and GDF9 were up-regulated, while forkhead box 03(Fox03) was down-regulated; The apoptosis genes Bax, Bad and Caspase-3 were also showed down-regulated. And the granulosa cell apoptosis in the experimental group was significantly less than that in the control group. Conclusion ROCK inhibitor Y27632 can inhibit the apoptosis of granulosa cells and prevents the abnormal assembly of oocyte spindles to improve the quality of follicle development in vitro.

Mosquito density monitoring data by ARIMA model / 上海预防医学

Objective To forecast the trend of mosquito density index in Pudong New Area, Shanghai so as to provide evidence for disease control and risk-control measures for vector-borne diseases. Methods Mosquito monitoring data was collected in Pudong New Area between 2011 and 2015 at the city-level monitoring sites for analysis on the trend of the mosquito density index in Pudong New Area of Shanghai by using the Autoregressive Integrated Moving Average Model (ARIMA). Results From 2011 to 2015, a total of 135 times labor-hour monitoring were carried out at the city-level monitoring points in Pudong New Area.The mosquito density index averaged 6.17/labor-hour with a standard deviation at 4.93, S=[0, 18]/labor-hour.Using ARIMA to analyze the change trend of mosquito density index in Pudong New Area, ARIMA(2, 0, 1)became the final fitting model, with R2=0.808.In the model, the Ljung-Box Q test value was 19.632(AR1=1.866, AR2=-0.907), and MA parameter was 0.999. Conclusion ARIMA model can be used to predict mosquito density monitoring data, but low monitoring frequency and irregular cycle length will affect the prediction results.

Mosquito population composition and density fluctuation in Shanghai Pudong New Area from 2017 to 2019 / 上海预防医学

Objective To learn the density, distribution, population composition, and seasonal fluctuation of mosquitoes in Shanghai Pudong New Area, and to provide evidence for the mosquito-borne diseases control and prevention. Methods From 2017 to 2019, light trap method was used to monitor the mosquito density in farmyard, parks, hospitals, residential areas and the barns, three times a month from April to November. Results A total of 24 times/set light traps were set up and 7 104 mosquitoes were captured.The average density was 3.07 insects per lamp.Culex pipienspallens (81.52%) and Aedes albopictus (12.10%) were the mostly captured, followed by Armigeres subalbatus (3.24%), Culex tritaeniorhynchus (2.78%) and Anopheles sinensis (0.36%).The proportion of Culex pipienspallens was increasing year by year, and that of Aedes albopictus was decreasing year by year.The seasonal variation curve of mosquito density showed a single peak distribution, with the peak from June to July.Among the five habitat types, the mosquito density from high to low was hospital (4.68/set), farmyard (4.38/set), livestock shed (3.25/set), residential household (2.81/set) and park (1.38/set).The mosquito density in urban area, urban-rural junction and rural area was 2.69, 3.32 and 3.36 respectively (i.e., rural area > urban-rural integration > urban area). Conclusion Culex pipienspallens and Aedes albopictus are the dominant species in Pudong New Area.Parks, hospitals and residential areas are the most important mosquitoes infestation areas, therefore more attention must be paid to mosquito control in these areas.

Preparation optimization of extract of Moringa oleifera leaves and its immune regulation effect on immunosuppressed mice / 中国中药杂志

With total flavonoid content and dry extract yield as the observation indexes, the optimal extraction conditions of Moringa oleifera leaves were determined by using single factor test and orthogonal test, and cyclophosphamide modeling method was used to establish immunosuppressed mice models, so as to investigate the effects of M. oleifera leaves extract on immune regulation in mice. The results showed that the optimal preparation conditions were as follows: extraction with 70% ethanol, material-liquid ratio 1:15, extraction temperature 80 °C, three times, 1.5 hours for each time. Under these conditions, the content of total flavonoids from M. oleifera leaves was 15.64 mg·g⁻¹, which can significantly enhance macrophage phagocytosis and immune organ index, promote the synthesis of serum immunoglobulin IgG and hemolysin, and decrease AST activity, with regulation effect on immune dysfunction.

Application of 25-gauge mini-invasive system in cataract surgery after vitrectomy / 吉林大学学报(医学版)

Objective:To observe the curative effect of 25-gauge mini-invasive system in cataract surgery after vitrectomy,and to provide a safe operation method for the patients with cataract induced by vitrectomy. Methods:A total of 29 patients(30 eyes)with cataract after vitrectomy were selected. Phacoemulsification and implantation of artificial lens with 25-gauge mini-invasive irrigation system were performed in the patients.The best corrected visual acuity(BCVA),intraocular pressure(IOP),corneal endothelial cell loss rate,intraoperative and postoperative complications of the patients were observed.Results:All the patients received the operation successfully.One month after operation,BCVA≥0.5 were found in 5 eyes,0.3-0. 5 in 8 eyes,0.1-0.3 in 9 eyes,Fc-0.1 in 8 eyes;the BCVA 1 month after operation had significant differences compared with before operation(P<0.05).The mean IOP before operation and 1 d,7 d,1 month,3 months after operation were (17.13±2.84),(17.20±4.16),(17.43±3.41),(17.36±2.51),and(16.73±2.33)mmHg;the IOP of the patients at 1 d after operation had significant difference compared with before operation(P<0.05).No statistically significant differences of IOP were found between other groups(P>0.05).The number of corneal endothelial cells before operation was(2 467±280)mm-2and the number after operation was(2 033±209)mm-2;the loss rate of corneal endothelial cells was 17.59%.There were no sever complications such as retinal redetachment,detachment of choroid,capsular rupture or suprachoroidal hemorrahage.Conclusion:Phacoemulsification for cataract after vitrectomy with 25G mini-invasive system way can maintain the IOP,reduce the complications and enhance the security in cataract surgery.

Effect of parents accompany comfort anesthesia technique on child anesthesia induction compliance / 重庆医学

Objective To investigate the effect of parents accompany comfort anesthesia technique on child anesthesia induction compliance.Methods Two hundreds and thirteen children cases undergoing elective operation under general anesthesia were selected,aged 2-12 years old,ASA grade Ⅰ-Ⅱ,developmental normal,without mental system and cognitive dysfunction,and randomly divided into the experimental group 1,2 and control group.The children cases in the experimental group 1 conducted the anesthesia induction by their parents accompany on the operation day,while those in the experimental 2 conducted the anesthesia induction on the operation day after conducting the comfort anesthesia technique guidance.The control group was performed the conventional follow up before operation,the anesthesia induction was performed by the operation nurses and anesthesia doctor accompany on the operation day.Results There were statistically significant differences between the cases of slightly large age,with surgical experience,parents non-anxiety and psychological internal control type with the control group(P＜0.05).The difference between conducting the anesthesia induction guidance and non-conducting the anesthesia induction guidance was not statistically significant(P＞0.05).Conclusion The parents accompany comfort anesthesia induction technique can effectively increase the compliance during the anesthesia induction period in the children patients with slightly large age,operation experience,parents non-anxiety and psychological internal control type.

Effect of parents accompany comfort anesthesia technique on child anesthesia induction compliance / 重庆医学

Objective To investigate the effect of parents accompany comfort anesthesia technique on child anesthesia induction compliance.Methods Two hundreds and thirteen children cases undergoing elective operation under general anesthesia were selected,aged 2-12 years old,ASA grade Ⅰ-Ⅱ,developmental normal,without mental system and cognitive dysfunction,and randomly divided into the experimental group 1,2 and control group.The children cases in the experimental group 1 conducted the anesthesia induction by their parents accompany on the operation day,while those in the experimental 2 conducted the anesthesia induction on the operation day after conducting the comfort anesthesia technique guidance.The control group was performed the conventional follow up before operation,the anesthesia induction was performed by the operation nurses and anesthesia doctor accompany on the operation day.Results There were statistically significant differences between the cases of slightly large age,with surgical experience,parents non-anxiety and psychological internal control type with the control group(P＜0.05).The difference between conducting the anesthesia induction guidance and non-conducting the anesthesia induction guidance was not statistically significant(P＞0.05).Conclusion The parents accompany comfort anesthesia induction technique can effectively increase the compliance during the anesthesia induction period in the children patients with slightly large age,operation experience,parents non-anxiety and psychological internal control type.

Preparation of andrographolide-loaded solid dispersions / 中成药

AIM To prepare the andrographolide-loaded solid dispersions.METHODS Differential scanning calorimetry (DSC) and X-ray powder diffraction (XRPD) were used for the analysis of solid dispersions previously prepared from the mixture of andrographolide and PVPK30 (1 ∶ 9) in autoclave.In addition to the evaluation index of in vitro dissolution rate,the influencing factors of pressure,temperature and reaction time were taken into consideration for the preparation optimization by Box-Behnken method.RESULTS Andrographolide was totally dispersed in solid dispersions in an amorphous state,manifesting an inhibited crystal diffraction peaks' formulation.Under the optimal conditions of 21.26 MPa for pressure,40.76 ℃ for temperature,and 1.13 h for reaction time,the in vitro dissolution rate was 85.49％.CONCLUSION After andrographolide is made into solid dispersions,its in vitro dissolution rate is obviously increased.

Effects of single heat stress treatment on spermatogenic cells in mice / 中华男科学杂志

<p><b>OBJECTIVE</b>To investigate the effects of single heat stress treatment on spermatogenic cells in mice.</p><p><b>METHODS</b>We randomly divided 36 C57 male mice into a control and a heat stress treatment group and submerged the lower part of the torso in water at 25 °C and 43 °C, respectively, both for 15 minutes. At 1, 7, and 14 days after treatment, we obtained the testicular organ indexes, observed the changes in testicular morphology by HE staining, and determined the location and expression levels of the promyelocytic leukemia zinc finger (PLZF) and synaptonemal comlex protein-3 (SCP-3) in the testis tissue by immunohistochemistry and Western blot.</p><p><b>RESULTS</b>The testicular organ index was significantly lower in the heat stress treatment than in the control group (P < 0.05). Compared with the controls, the heat shock-treated mice showed loosely arranged spermatogenic cells scattered in the seminiferous tubules at 1 day after heat stress treatment, atrophied, loosely arranged and obviously reduced number of spermatogenic cells at 7 days, and relatively closely arranged seminiferous tubules and increased number and layers of spermatogenic cells at 14 days. The number of SCP-3 labelled spermatocytes obviously decreased in the heat stress-treated animals at 1 and 7 days and began to increase at 14 days. The PLZF protein expression was significantly reduced in the heat stress treatment group at 1 day as compared with that in the control (0.19 ± 0.12 vs 0.64 ± 0.03, P < 0.01), but elevated to 0.77 ± 0.02 at 7 and 14 days, even remarkably higher than in the control animals (P < 0.01).</p><p><b>CONCLUSION</b>Heat stress treatment can induce short-term dyszoospermia in mice, which can be recovered with the prolonged time after treatment.</p>

Dynamic study and screening of new markers of spermatogonial stem cells by iTRAQ protein mass spectrometry / 中华男科学杂志

<p><b>OBJECTIVE</b>To study the dynamic changes in the protein marker expression in the spermatogonial stem cells (SSCs) of mice at different ages by iTRAQ protein mass spectrometry and to screen new markers using the bioinformatic proteome database.</p><p><b>METHODS</b>Based on the postnatal weeks, we divided 80 healthy male C57BL/6 mice into eight age groups of equal number, harvested their testicular tissues, extracted proteins following purification of the SSCs by compound enzyme digestion and magnetic-activated cell sorting. Then we analyzed and identified proteins using two-dimensional electrophoresis, protein mass spectrometry, and protein database information.</p><p><b>RESULTS</b>Totally, 248,510 mass spectra were obtained from the MS experiment and 1132 proteins were identified. By the criteria of >1.2-fold for protein abundance difference and P value <0.05, we identified 298 differentially expressed proteins and 9 currently known makers of SSCs (PCNA, GFRalpha1, CDH1, Annexin A7, UCHL1, VASA, CD49f, CD29, and PLZf). Compara- tive analysis showed different expressions of the proteins in the SSCs of the mice of different ages, and the differences in the expressions of GFRalpha1, CD49f, and CD29 were consistent with the findings in other published literature. Ten proteins (P63, CD71, CD98, K19, ACE, K18, K15, K17, SH2, and SH3) were selected as SSC markers to be further studied.</p><p><b>CONCLUSION</b>The proteins in SSCs are differentially expressed in mice of different ages. The technology of iTRAQ protein mass spectrometry can be used to analyze and compare the proteome information of mouse SSCs, obtain differentially expressed proteins in mice of different ages, and thus offers a new ap- proach to further analysis and study of the function and roles of these differential proteins.</p>

Anti-methicillin-resistant Staphylococcus aureus assay of azalomycin F5a and its derivatives / 中国天然药物

AIM@#To discover anti-methicillin-resistant Staphylococcus aureus (anti-MRSA) microbial natural products or their derivatives.@*METHOD@#Azalomycin F5a (1) was prepared through fermentation of Streptomyces hygroscopicus var. azalomyceticus, and its derivatives were synthesized through hydrocarbylation in hydrocarbyl alcoholic-AcOH (4 : 1) and subsequent demalonylation with 2 mol·L(-1) KOH in MeOH-H2O (7 : 3). Their activities against MRSA ATCC 33592 and three clinical MRSA isolates were evaluated by the agar diffusion and broth microdilution methods.@*RESULTS@#Four demalonylazalomycin F5a derivatives 2 to 5 were synthesized. The anti-MRSA activity assay indicated that compounds 1 to 5 showed remarkable activity against MRSA, and their minimum inhibitory concentrations (MICs) were respectively 3.0-4.0, 0.5-1.0, 0.67-1.0, 0.67-0.83, and 0.5-0.83 μg·mL(-1).@*CONCLUSION@#Azalomycin F5a and the demalonylazalomycin F5a derivatives 2-5 showed remarkable anti-MRSA activity, and the anti-MRSA activities of 2 to 5 were higher than that of 1, while the anti-MRSA activities of 2 to 5 showed no obvious differences. It was also shown that the malonyl monoester group of azalomycin F5a was less important for its anti-MRSA activity.

Clinical and histo-pathological characteristics of 2874 cases with chronic kidney diseases in Southern parts of Hebei province / 中华流行病学杂志

Objective The aim of this study was to analyze the characteristics ot patients with chronic kidney disease (CKD) in Southern parts of Hebei province.Methods Records of 2874 CKD patients during January,2008 to May,2011 were retrospectively reviewed.Demographic,clinical and histo-pathological data were analyzed and compared to ones from the past five years.Results The age distribution of the groups was between 16 and 84 years old,with 62.39％ of them between 20 and 50.All patients underwent renal biopsy that with primary glomerulonephritis occurring in 1966 cases (68.41％),secondary glomerulonephritis in 826 cases (28.74％).The frequently seen pathological patterns were IgA nephropaty ( IgAN ),membranous nephropathy (MN) and minimal change disease (MCD) in proper order in the former group while Henoch-Schonlein purpura nephritis (HSPN) and lupus nephritis (LN) were seen in the latter group.Comparing to data of the past five years,the incidence rates of MN,MCD and HBV-GN increased to 16.84％,15.73％and 4.41％ respectively,but all IgAN,HSPN and LN had respectively decreased to 24.70％,5.50％ and 6.65％.MN,IgAN,MCD were commonly appeared in histo-pathological patterns among patients over 50 years of age.Conclusion IgAN was still the most commonly seen renal disease.Compared to data of the past five years,the incidence rates of MN,MCD and HBV-GN showed an increase at different levels.Epidemiological and pathological pattern of patients with CKD in Southern Hebei province had only mild changes over the last 3 years.

PEGylated polyamidoamine dendrimer/methotrexate complex: pharmacokinetics and anti-tumor activity in normal and tumor-bearing rodents / 药学学报

Generation 4 polyamidoamine (PAMAM) dendrimer was PEGylated with polyethylene glycol (PEG) at an average molecular weight 5 000 via amide bond. PAMAM and PEGylated PAMAM (PAMAM-PEG) dendrimer were used as drug nanocarriers. Methotrexate (MTX), an antineoplastic agent, was selected as a model drug. PAMAM/MTX and PAMAM-PEG/MTX complexes were prepared. The pharmacokinetic characters and anti-tumor activity of the PAMAM-PEG/MTX complex were studied as compared with MTX injection and PAMAM/MTX complex by intravenous injection in rats and S180 tumor bearing mice, separately. The plasma samples from normal rats were analyzed by HPLC method, and concentration-time data were analyzed using a non-compartmental analysis. Their anti-tumor effects in vivo were evaluated against S180 solid tumors in mice by measuring average tumor weight and calculating the inhibitory rate of tumor on day 17 after successive injections. The results showed that both plasma half-life and mean retention time (MRT) of the complexes were longer than that of MTX injection (P<0.01), while the area under the plasma concentration vs time curve (AUC) of PAMAM-PEG/MTX was the largest as compared with that of free drug and PAMAM/MTX complex (P<0.01). The inhibitory rate of tumor of PAMAM-PEG/MTX complex enhanced 2.1 and 1.8 times over that of free drug and PAMAM/MTX complex, respectively, indicating that PAMAM-PEG/MTX exhibited the highest antitumor activity. In summary, PEGylated PAMAM could be useful as a potential drug delivery carrier.

A case-control study on risk factors for tuberculosis in Yinchuan city / 中华预防医学杂志

<p><b>OBJECTIVE</b>To study the risk factors of tuberculosis in Yinchuan city and lay a basis for its prevention and control.</p><p><b>METHODS</b>A matched case-control (119:179) study for the risk factors was carried out. Data were analyzed with single-variable analysis and multiple factor logistic regression analysis.</p><p><b>RESULTS</b>Single-variable analysis showed that the education background (chi2 = 2.363, P = 0.018), family economic income (chi2 = 3.040, P = 0.002), smoking (chi2 = 2.500, P = 0.012), physical activities (chi2 = 2.330, P = 0.020), bacille Calmette-Guerin (BCG) vaccination history (chi2 = 22.151, P = 0.000), history of exposure to tuberculosis (chi2 = 15.740, P = 0.000) and so on had significant effects on tuberculosis. Multiple logistic regression analysis showed that family monthly income, smoking, physical activity, BCG vaccination history, history of exposure to tuberculosis entered the final regression model (chi2 = 5.880, 7.368, 3.891, 21.127, 14.536; OR = 0.529, 1.571, 0.774, 0.264, 3.978; P < 0.05).</p><p><b>CONCLUSION</b>History of exposure to tuberculosis and smoking should be the risk factors of tuberculosis in Yinchuan. Having much income, physical activities, and BCG vaccination history should be the preventive factors.</p>

Current Status of Natural Products from Plants as Anti-herpes Simplex Virus 1 Agents / 中国病毒学·英文版

Nucleoside analogues have been the mainstay of clinical treatment of herpes simplex virus 1 (HSV-1) infections since their development. However, the emergence of drug resistant strains has underlined the urgency of the discovery of novel anti-HSV-1 drugs. Natural products, which provided many novel drug leads, are known to be an important source of anti-HSV-1 agents. Herein, we present an overview of natural products with anti-HSV-1 activities isolated from a variety of plants reported in recent years. Several different compounds, mainly belonging to the three groups of polysaccharides, polyphenols and terpenes, showed antiviral effects against HSV-1, indicating their potential to be promising anti-HSV-1 agents.

Influence of particle size and MePEG molecular weight on in vitro macrophage uptake and in vivo long circulating of stealth nanoparticles in rats / 药学学报

<p><b>AIM</b>To investigate the influence of particle size and methoxypolyethyleneglycol (MePEG) molecular weight on the in vitro macrophage uptake and in vivo long circulating of recombinant human tumor necrosis factor-alpha (rHuTNF-alpha)-loaded stealth nanoparticles in rats.</p><p><b>METHODS</b>Three sizes (approximately 80, 70 and 240 nm) of poly (methoxypolyethyleneglycol cyanoacrylate-co-n-hexadecyl cyanoacrylate) (PEG-PHDCA) nanoparticles loading rHuTNF-alpha were prepared at different MePEG molecular weights (Mr 2,000, 5,000, 10,000) using the double emulsion method. The in vitro macrophage uptake and in vivo long circulating properties in rats were examined and compared.</p><p><b>RESULTS</b>The uptake by macrophages decreased and the half-life of rHuTNF-alpha in rat increased with the increase of MePEG molecular weight or the decrease of particle size. The linear-ships between particle size and MePEG molecular weight and the in vitro macrophage uptake and in vivo long circulating properties were fairly good. Having the highest MePEG surface density (1.32 nm(-2)) , the shortest average distance between neighboring MePEG chain (0.87 nm) and the thicker fixed aqueous layer thickness (FALT, 5.16 nm), PEG5,000-PHDCA nanoparticles (80.0 nm) earned the strongest potency of decreasing uptake by macrophages and prolonging the half-life of rHuTNF-alpha in rat.</p><p><b>CONCLUSION</b>Within the experimental limits, particle size and MePEG molecular weight had dramatic influence on in vitro macrophage uptake and in vivo long circulating properties of rHuTNF-alpha-loaded stealth nanoparticles.</p>

Stealth PEG-PHDCA niosomes: effects of chain length of PEG on niosomes in vitro complement consumption and phagocytic uptake / 药学学报

<p><b>AIM</b>Poly (methoxypolyethyleneglycol cyanoacrylate-co-hexadecyl cyanoacrylate) (PEG-PHDCA) and PHDCA niosomes were prepared and the influence of the PEG chain length on the niosomes physicochemical characteristics, complement consumption and phagocytic uptake were studied.</p><p><b>METHODS</b>The physicochemical parameters of PEG-PHDCA niosomes were characterized in terms of particle size, zeta aqueous layer thickness. The relationship between physicochemical characteristics and in vitro complement consumption and phagocytic uptake was further illustrated.</p><p><b>RESULTS</b>Experimental results showed that PEG10,000-PHDCA had most loose structure and least PEG surface density among three groups. Configuration simulation through fixed aqueous layer thickness confirmed that PEG folding and less flexibility of the PEG chains of PEG10,000-PHDCA niosomes were accountable for its poor stealth effects. Compared with PEG2,000-PHDCA, PEG5,000-PHDCA showed a thicker fixed aqueous layer (FALT) of 4.20 nm, less negative zeta potential of -10.03 mV, and enhanced PEG surface density of 0.49 PEG x nm(-2), leading to the best effects of reduction of complement consumption and phagocytic uptake.</p><p><b>CONCLUSION</b>Excessive chain length of PEG was not necessary for stealth effects of PEG-PHDCA niosomes. PEG5,000-PHDCA niosomes had best effects on evading complement consumption and subsequent phagocytic uptake.</p>

Preparation and stability of recombinant human tumor necrosis factor-alpha-loaded stealth nanoparticles / 药学学报

<p><b>AIM</b>To prepare recombinant human tumor necrosis factor-alpha (rHuTNF-alpha) -loaded stealth nanoparticles with different PEG chain lengths and sizes, and investigate the stability of nanoparticle suspensions.</p><p><b>METHODS</b>The poly( MePEG cyanoacrylate-co-hexadecyl cyanoacrylate) (MePEG-PHDCA) and poly(hexadecyl cyanoacrylate) (PHDCA) were synthesized and characterized with Fourier transform infrared spectrum (FTIR), 1HNMR, 13CNMR and gel permeation chromatography (GPC). Uniform design was used to optimize the entrapment efficiency. The nanoparticle suspensions were stored at 2 - 8 degrees C for 4 weeks, and the particle size evolution was studied.</p><p><b>RESULTS</b>FTIR, 1HNMR and 13CNMR were consistent with the structures of MePEG-PHDCA and PHDCA whose polydispersity indexes were all less than 1.1, indicating narrow distributions. The entrapment efficiency of all nanoparticles was satisfactory. The three different mean diameters of MePEG-PHDCA and PHDCA nanoparticles were about 80 nm, 170 nm and 240 nm, separately. The nanoparticle suspensions maintained their sizes at 2 - 8 degrees C for 4 weeks</p><p><b>CONCLUSION</b>MePEG-PHDCA with three different molecular weight MePEG and PHDCA were synthesized successfully. There are negligible aggregations and bulk or surface erosion as for both stealth MePEG-PHDCA and conventional PHDCA nanoparticles in distilled water.</p>