Objective: For stable encapsulation of DOX into liposomes, we prepared triethylamine (TEA)-PGA-liposomes using PGA as an internal trapping agent.
Methods: We prepared TEA-PGA-liposomes by remote loading of DOX with a TEA gradient into preformed liposomes prepared with 1, 2, or 4?mg/mL PGA (molecular weights 4800, 9800, and 20 500), and evaluated their biodistribution and antitumor effects on Lewis lung carcinoma (LLC) tumor-bearing mice.
Results: TEA-PGA-liposomes using the higher the molecular weight or concentration of PGA showed a slower release of DOX from the liposomes. TEA-PGA-liposomes prepared with a high concentration of PGA could enhance DOX accumulation in tumors and prolonged DOX circulation in the serum, indicating that DOX may be retained stably in the liposomal interior by interaction with PGA. Furthermore, injection of TEA-PGA-liposomes prepared with 4?mg/mL of PGA9800 or 2?mg/mL PGA20500 strongly inhibited tumor growth in LLC tumor-bearing mice.
Conclusions: PGA may be a potential trapping agent for liposomal DOX for tumor drug delivery. 相似文献
Materials and Methods: BMSCs from C57BL/6 J mice were isolated and the third passage was used for subsequent experiments. Additionally, a series of in vitro transwell coculture assays were performed to explore the effects of BMSCs on the proliferation of MM cells 5TGM1 and CD4+ T cells. Furthermore, a 5TGM1-induced MM mice model was established. Moreover, PD-L1 shRNA was transfected into BMSCs to investigate whether PD-1/PD-L1 pathway involved in BMSCs-mediated regulation of T cells and MM growth.
Results: Data revealed that BMSCs significantly promoted 5TGM1 proliferation in a dose-dependent manner. Furthermore, BMSCs administration exerted stimulatory effects on MM development in terms of shortening the mouse survival rate, promoting tumor growth, and enhancing inflammatory infiltration in the MM model mice. Moreover, BMSCs decreased the percentage of Th1 and Th17 cells, whereas increased that of Th2 and Treg cells. Their corresponding cytokines of these T cell subsets showed similar alteration in the presence of BMSCs. Additionally, BMSCs significantly suppressed CD4+ T cell proliferation. We also found that PD-L1 shRNA inhibited 5TGM1 proliferation likely through activation of CD4+ T cells. Further in vivo experiments confirmed that PD-L1 inhibition attenuated BMSCs-induced MM growth, inflammation infiltration and imbalance of Th1/Th2 and Th17/Treg.
Conclusion: In summary, our findings demonstrated that BMSCs promoted cell proliferation of MM through inhibiting T cell immune responses via PD-1/PD-L1 pathway. 相似文献
Objective: To develop ortho ester-based, pH-sensitive lipoplexes for efficient gene delivery both in cultured cells and in vivo.
Materials and methods: A novel cationic and acid-labile lipid (DOC) containing a cationic headgroup and a cholesterol-derived lipid tail joined together by an acid-labile ortho ester linker was designed and synthesized. DOC was formulated into liposomes with the conical helper lipid DOPE, and then into lipoplexes with plasmid DNA encoding a luciferase reporter gene. The physicochemical properties of the lipoplexes (size, surface charge and pH-sensitivity) were characterized. Gene delivery by DOC/DOPE/DNA lipoplexes was also evaluated in CV-1 cells and in CD-1 mice following intratracheal injection. Lipoplexes consisting of the acid-stable cationic lipid DC-Chol were characterized as a control.
Results: DOC formed cationic lipoplexes with DOPE and DNA. After incubation at acidic pH 4.6, DOC/DOPE/DNA lipoplexes lost their positive charges and aggregated with one another as a result of DOC hydrolysis. Both in CV-1 cell culture and in CD-1 mice, DOC/DOPE/DNA lipoplexes increased the luciferase gene expression by 5- to 10-fold compared with the analogous but acid-stable DC-Chol/DOPE/DNA lipoplexes.
Discussion and conclusion: Incorporation of an acid-labile ortho ester linker into a cationic lipid is a viable approach to enhance gene delivery by the corresponding lipoplexes both in cultured cells and in vivo. 相似文献
Methods: Data were obtained from Lifelines (n?=?769). Dairy fat intake was determined by FFQ. Fatty acids were measured in fasting plasma triglycerides (TG), phospholipids (PL) and cholesterol esters (CE).
Results: Median (25th–75th percentile) intakes of dairy and dairy fat were 322(209–447) and 12.3(8.4–17.4) g/d respectively. A pilot study showed that trans-C18:1(n-7) and CLA were only detectable in TG and PL. Of the established markers, TG C15:0 was most strongly associated with dairy fat intake (standardized β (std.β)?=?0.286, R2?=?0.111). Of the less established markers, TG trans-C18:1(n-7) was most strongly associated with dairy fat intake (Std.β?=?0.292, R2?=?0.115), followed by PL CLA (Std.β?=?0.272, R2?=?0.103) and PL trans-C18:1(n-7) (Std.β?=?0.269, R2?=?0.099). In TG, a combination of C15:0 and trans-C18:1(n-7) performed best (R2?=?0.128). In PL, a combination of C14:0, C15:0, trans-C18:1(n-7) and CLA performed best (R2?=?0.143).
Conclusion: Trans-C18:1(n-7) and CLA can be used as biomarkers of dairy fat intake. Additionally, combining established with less established markers allowed even stronger predictions for dairy fat intake. 相似文献
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Methods: Blood samples were collected from 140 nickel smelting workers and 140 age-matched office workers to test for H3K4me3, and HP1 levels.
Results: H3K4me3 was statistically significantly different (p?<?0.05) between the two groups and positively correlated with employment length (rs?=?0.267). HP1 was not correlated with employment length (p?=?0.066) but was significantly different between the two groups.
Conclusions: Chronic exposure to nickel can induce oxidative damage, and increase H3K4me3 expression and inhibit HP1 expression. 相似文献
Methods: The efficacy of C-PC was evaluated against the proliferation of ESCC cell lines EC9706 and EC1 by CCK-8 kit and in a mice model of ESCC EC9706. Cell cycle and apoptosis were investigated by flow cytometry, and cell invasion was determined via transwell chamber. Protein expression was examined by Western blots.
Results: We found that C-PC exhibited anti-proliferation ability in a time-dependent manner and a dose-dependent manner in ESCC EC9706 and EC1 cells. Besides, C-PC markedly arrested cell cycle in the G0/G1 phase, induced cell apoptosis and suppressed cell invasion ability in both EC9706 and EC1 cells (p?<?.01). Notably, C-PC evoked the elevations of Bax, PARP, and cleaved-caspase-3 protein, but reduced cyclin D1, CDK4, Bcl-2, MMP-2, and MMP-9 expression levels. Further investigation from in vivo experiment revealed that C-PC displayed significant antitumor efficacy in the xenografted EC9706 model.
Conclusions: Our data presented herein suggest C-PC exerts antitumor efficacy in ESCC. 相似文献
Objective: To evaluate longitudinal expression of tear and tissue CTSS activity relative to other disease indicators in Non-Obese Diabetic (NOD) mice.
Methods: CTSS activity was measured in tears and lacrimal glands (LG) from male 1–6?month (M) NOD and 1 and 6?M BALB/c mice. Lymphocytic infiltration was quantified by histopathology, while disease-related proteins (Rab3D, CTSS, collagen 1) were quantified using q-PCR and immunofluorescence.
Results: In NOD LG, lymphocytic infiltration was noted by 2?M and established by 3?M (p?<?0.01). IFN-?, TNF-α, and MHC II expression were increased by 2?M (p?<?0.01). Tear CTSS activity was significantly elevated at 2?M (p?<?0.001) to a maximum of 10.1-fold by 6?M (p?<?0.001). CTSS activity in LG lysates was significantly elevated by 2?M (p?<?0.001) to a maximum of 14-fold by 3?M (p?<?0.001). CTSS and Rab3D immunofluorescence were significantly increased and decreased maximally in LG acini by 3?M and 2?M, respectively. Comparable changes were not detected between 1 and 6?M BALB/c mouse LG, although Collagen 1 was decreased by 6?M in LG of both strains.
Conclusion: Tear CTSS activity is elevated with other early disease indicators, suggesting potential as an early stage biomarker for SS. 相似文献
Pseudiberus liuae Wu in Wu & Asami, In Press
LSID urn:lsid:zoobank.org:act:3C9299AA-5089-4E43-9B26-85A0D6C23B66
Bradybaena qixiaensis Wu & Asami, In Press
LSID urn:lsid:zoobank.org:act:7991C4D5-5E0B-46DF-8B19-BE26511806CD
Nesiohelix yeni Wu & Asami, In Press
LSID urn:lsid:zoobank.org:act:68CFF173-AACC-4DA8-B347-9ABB5CA569A3 相似文献
Methods: PEGylated docetaxel liposome (PL-DOC) was prepared by thin-film evaporation method and lyophilization. The effect of various components of the lipids and their compatibility with DOC on the entrapment efficiency (EE) of liposome was investigated. The lyophilized PL-DOC was characterized by morphology, particle size, zeta potential, EE, release in vitro and stability. Pharmacokinetics and biodistribution in vivo of lyophilized PL-DOC were also investigated.
Results: The optimal liposome formulation was egg phosphatidylcholine (EPC):cholesterol (CH):DSPE-PEG2000:DOC?=?56:40:4:4 (molar ratio). Sucrose and mannitol were chosen as cryoprotectant in the lyophilization (cryoprotectant-to-lipid (C/L) mass ratio = 8:1). The size of lyophilized PL-DOC was 152.3?±?1.0?nm with negative charge and the EE was 89.75?±?1.79%. Compared with nonlyophilized PL-DOC, the lyophilized PL-DOC was more stable at 4?°C for six months. The lyophilized PL-DOC also showed the good stability after reconstituted by 5% glucose injection. In vitro release study of PL-DOC showed that PL-DOC had a sustained release effect. After i.v. administration at the dose of 10?mg/kg in rats, a significant increase in the AUC0-∞, MRT0-∞ and t1/2 was observed in PL-DOC group compared with conventional docetaxel liposome (CL-DOC) and DOC injection (DOC-I) group. Biodistribution studies in mice showed that PL-DOC significantly decreased the uptake by the organs of mononuclear phagocytic system (MPS), such as liver and spleen, while prolonging the retention time of DOC in the plasma.
Conclusion: Our PEGylated liposome formulation reported in this study could potentially produce viable clinical strategies for improved delivery of DOC for the treatment of human cancer. 相似文献
Methods: We evaluated the protective role of hesperetin in acrolein-induced lung injury using Lewis lung carcinoma (LLC) cells and mice.
Results: Upon exposure of LLC cells and mice to acrolein, hesperetin ameliorated the lung inbjury through attenuation of oxidative stress.
Conclusion: In the present report, we demonstrate that hesperetin exhibits a protective effect against acrolein-induced apoptosis of lung cells in both in vitro and in vivo models. Our study provides a useful model to investigate the potential application of hesperetin for the prevention of lung diseases associated with acrolein toxicity. 相似文献
Methods: Oxidative stress parameters and activities of antioxidant and associated enzymes were analyzed in two-day-old D. melanogaster insects after exposure of larvae and newly eclosed adults to three molybdate levels (0.025, 0.5, or 10 mM) in the food.
Results: Molybdate increased content of low molecular mass thiols and activities of catalase, superoxide dismutase, glutathione-S-transferase, and glucose-6-phosphate dehydrogenase in males. The activities of these enzymes were not affected in females. Males exposed to molybdate demonstrated lower carbonyl protein levels than the control cohort, whereas females at the same conditions had higher carbonyl protein content and catalase activity than ones in the control cohort. The exposure to 10 mM sodium molybdate decreased the content of protein thiols in adult flies of both sexes. Sodium molybdate did not affect the activities of NADP-dependent malate dehydrogenase and thioredoxin reductase in males or NADP-dependent isocitrate dehydrogenase in either sex at any concentration.
Discussion: Enhanced antioxidant capacity in upon Drosophila flies low molybdate levels in the food suggests that molybdate can be potentially useful for the treatment of certain pathologies associated with oxidative stress. 相似文献
Objective: To characterize by in vitro biochemical and in silico studies the NBDHEX analogues named MC2752 and MC2753.
Materials and methods: Synthesis of MC2752 and MC2753, biochemical assays and in silico docking and normal-mode analyses.
Results: The presence of a hydrophobic moiety in the side chain of MC2753 confers unique features to this molecule. Unlike its parent drug NBDHEX, MC2753 does not require GSH to trigger the dissociation of the complex between GSTP1-1 and TRAF2, and displays high stability towards the nucleophilic attack of the tripeptide under physiological conditions.
Discussion and conclusion: MC2753 may represent a lead compound for the development of novel GSTP1-1 inhibitors not affected in their anticancer action by fluctuations of cellular GSH levels, and characterized by an increased half-life in vivo. 相似文献