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https://www.readbyqxmd.com/read/29792807/micelles-protect-intact-metallo-supramolecular-block-copolymer-complexes-from-solution-to-gas-phase-during-electrospray-ionization
#1
Kai Hung Huang, Tsung-Han Tu, Shi-Cheng Wang, Yi-Tsu Chan, Cheng-Chih Hsu
Supramolecular diblock copolymers using metal-ligand coordination can be synthesized under ambient conditions by delicate design of the end groups of the homopolymer chains. However, mass spectrometric analysis of such metallo-supramolecular copolymers is challenging. One of the reasons is the nonpolarity of the polymer chains, making it hard to disperse the complexes in electrospray ionization (ESI)-friendly environments. The other difficulty is the noncovalent nature of such copolymers, which is easily disrupted during the ionization...
May 24, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29792799/in-vivo-evaluation-of-reduction-responsive-alendronate-hyaluronan-curcumin-polymer-drug-conjugates-for-targeted-therapy-of-bone-metastatic-breast-cancer
#2
Kaili Wang, Chunjing Guo, Xue Dong, Yueming Yu, Bingjie Wang, Wanhui Liu, Daquan Chen
Many cancers such as human breast cancer and lung cancer easily metastasize to bones, leading to the formation of secondary tumors in advanced stage. Based on the CD44-targeted effect of oHA and bone-targeted effect of ALN, we prepared a reduction-responsive, CD44 receptor-targeting and bone-targeting nano-micelle, called CUR-loaded ALN-oHA-S-S-CUR micelles. In this study, we aimed to evaluate the antitumor activity and bone-targeting ability of CUR-loaded ALN-oHA-S-S-CUR micelles. The in vivo experiment results showed that a larger number of micelles was gathered in the bone metastatic tumor tissue and reduced the bone destruction...
May 24, 2018: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/29790372/folate-receptor-targeted-mixed-polysialic-acid-micelles-for-combating-rheumatoid-arthritis-in-vitro-and-in-vivo-evaluation
#3
Nan Zhang, Chunyu Xu, Na Li, Shasha Zhang, Lingling Fu, Xiao Chu, Haiying Hua, Xianghui Zeng, Yongxing Zhao
OBJECTIVE: Rheumatoid arthritis (RA) is associated with chronic inflammation. The suppression of inflammation is key to the treatment of RA. Glucocorticoids (GCs) are classical anti-inflammatory drugs with several disadvantages such as poor water solubility and low specificity in the body. These disadvantages are the reasons for the quick elimination and side effects of GCs in vivo. Micelles are ideal carriers for GCs delivery to inflamed synovium. We set out to improve the targeting and pharmacokinetic profiles of GCs by preparing a targeting micelle system...
November 2018: Drug Delivery
https://www.readbyqxmd.com/read/29787951/glutathione-triggered-dual-release-of-doxorubicin-and-camptothecin-for-highly-efficient-synergistic-anticancer-therapy
#4
Yiwen Li, Huailin Yang, Jiuxu Yao, Haiyang Yu, Xin Chen, Peng Zhang, Chunsheng Xiao
An amphiphilic biodegradable prodrug (PLG-g-mPEG/CPT) was synthesized by conjugating disulfide-containing camptothecin (CPT) to poly(L-glutamic acid)-graft-methoxy poly(ethylene glycol) (PLG-g-mPEG) through esterification reaction. The amphiphilic prodrugs could self-assemble into micellar nanoparticles and encapsulate doxorubicin (DOX) in aqueous solution at pH 7.4. The treatment of the nanoparticles with reducing glutathione (GSH) at cytosolic concentration (10 mM) significantly promoted the in vitro dual release of DOX and CPT from the micelles...
May 17, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29787814/lipid-modified-cell-penetrating-peptide-based-self-assembly-micelles-for-co-delivery-of-narciclasine-and-siulk1-in-hepatocellular-carcinoma-therapy
#5
Xiaoyun Wang, Fengbo Wu, Guoyou Li, Nan Zhang, Xiangrong Song, Yu Zheng, Changyang Gong, Bo Han, Gu He
Hepatocellular carcinoma (HCC) is the most frequent type of primary liver cancer, and one therapeutic approach is to target both the AMPK and autophagy pathways in order to synergistically promote programmed cell death. Here, a series of amphiphilic, lipid-modified cell-penetrating peptides were synthesized and allowed to self-assemble into micelles loaded with the AMPK activator narciclasine (Narc) and short interfering RNA targeting the unc-51-like kinase 1 (siULK1). The size of these micelles, their efficiency of transfection into cells, and their ability to release drug or siRNA cargo in vitro were pH-sensitive, such that drug release was facilitated in the acidic microenvironment of the tumor...
May 19, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29787303/where-do-nanometric-micelles-stand-for-biomedical-applications
#6
Edmond Gravel, Eric Doris
No abstract text is available yet for this article.
May 22, 2018: Future Medicinal Chemistry
https://www.readbyqxmd.com/read/29786730/dimensional-control-of-supramolecular-assemblies-of-diacetylene-derived-peptide-gemini-amphiphile-from-spherical-micelles-to-foamlike-networks
#7
Hao Jiang, Martin Ehlers, Xiao-Yu Hu, Elio Zellermann, Carsten Schmuck
Peptide amphiphiles capable of assembling into multidimensional nanostructures have attracted much attention over the past decade due to their potential applications in materials science. Herein, a novel diacetylene-derived peptide gemini amphiphile with a fluorenylmethyloxycarbonyl (Fmoc) group at the N-terminus is reported to hierarchically assemble into spherical micelles, one-dimensional nanorods, two-dimensional foamlike networks and lamellae. Solvent polarity shows a remarkable effect on the self-assembled structures by changing the balance of four weak noncovalent interactions (hydrogen-bonding, π-π stacking, hydrophobic interaction, and electrostatic repulsion)...
May 22, 2018: Soft Matter
https://www.readbyqxmd.com/read/29785688/the-influence-of-nonionic-surfactant-adsorption-on-enzymatic-hydrolysis-of-oil-palm-fruit-bunch
#8
Jatuporn Parnthong, Suratsawadee Kungsanant, Sumaeth Chavadej
Nonionic surfactants have been utilized to improve the enzymatic hydrolysis of lignocellulosic materials. However, the role of surfactant adsorption affecting enzymatic hydrolysis has not been elaborated well. In this work, nonionic surfactants differing in their molecular structures, namely the polyoxyethylene sorbitan monooleate (Tween 80), the secondary alcohol ethoxylate (Tergitol 15-S-9), and the branched alcohol ethoxylate (Tergitol TMN-6), were studied for their effects on the enzymatic hydrolysis of palm fruit bunch (PFB)...
May 22, 2018: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/29782948/dendritic-peg-outer-shells-enhance-serum-stability-of-polymeric-micelles
#9
Hao-Jui Hsu, Yanxiao Han, Michael Cheong, Petr Král, Seungpyo Hong
A higher surface density of poly(ethylene glycol) (PEG) on polymeric micelles enhances their stability in serum, leading to improved plasma circulation. To obtain fundamental, mechanistic understanding of the PEG effect associated with polymeric architecture/configuration, we have synthesized PEGylated dendron-based copolymers (PDCs) and linear block copolymers (LBCs) with similar molecular weights. These copolymers formed dendron (hyperbranched) and linear micelles, respectively, which were compared in terms of their stabilities in serum, micelle-serum protein interactions, and in vivo biodistributions...
May 18, 2018: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/29782698/morphology-regulation-in-redox-destructible-amphiphilic-block-copolymers-and-impact-on-intracellular-drug-delivery
#10
Raju Bej, Jayita Sarkar, Debes Ray, Vinod K Aswal, Suhrit Ghosh
In two ABA type amphiphilic block copolymers (P1, P2), the hydrophobic B block consists of a bioreducible segmented poly(disulfide) (PDS), while poly-N-isopropylacrylamide (PNIPAM) or poly(triethyleneglycol)methylether-methacrylate (PTEGMA) serve as the hydrophilic A blocks in P1 and P2, respectively, leading to the formation of polymersome and micelle, owing to the difference in the packing parameters. Both exhibit comparable doxorubicin (Dox) encapsulation efficiency, but glutathione (GSH) triggered release appears much faster from the polymersome than micelle owing to the complete degradation of the PDS segment in polymersome morphology unlike in micelle...
May 21, 2018: Macromolecular Bioscience
https://www.readbyqxmd.com/read/29781607/preparation-of-pga-pae-micelles-for-enhanced-anti-tumor-efficacy-of-cisplatin
#11
Yazhou Chen, Li Zhang, Yingjie Liu, Shiming Tan, Ruidan Qu, Zirong Wu, Yue Zhou, Jing Huang
Poly-γ-L-glutamic acid (PGA) is an outstanding drug carrier candidate owning to its excellent biodegradability and biocompatibility. PGA carrier may shield toxic drugs from the body and enable the delivery of poorly soluble or unstable drugs thereby minimize the side effects and improve drug efficacy. However, the limitation of PGA as a drug carrier is low drug loading efficiency (DLE), which is usually below 30%. In this study, we reported a chemical modification method using L-phenylalanine ethyl ester (PAE)...
May 21, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29780787/non-convulsive-seizure-related-to-cremophor-el%C3%A2-free-polymeric-micelle-formulation-of-paclitaxel-a-case-report
#12
Yoon Sun Shin, Kyung Jin Min, Seung Young Choi, Nak Woo Lee
Paclitaxel is a chemotherapeutic agent that is effective against ovarian, breast, lung, and other cancers. Although peripheral neurotoxicity is among the most common side effects of paclitaxel treatment, central neurotoxicity is rarely reported. When centrally mediated side effects are observed, they are attributed to Cremophor EL™ (CrEL), a surfactant-containing vehicle used for paclitaxel administration. In the present report, we discuss the case of a 72-year-old woman with ovarian carcinoma who experienced a non-convulsive seizure following administration of a CrEL-free, polymeric micelle formulation of paclitaxel...
May 2018: Obstetrics & Gynecology Science
https://www.readbyqxmd.com/read/29777987/phthalocyanine-sulfonamide-conjugates-synthesis-and-photodynamic-inactivation-of-gram-negative-and-gram-positive-bacteria
#13
Raquel Nunes da Silva, Ângela Cunha, Augusto C Tomé
Phthalocyanines bearing four or eight sulfonamide units were synthesized and their efficiency in the photodynamic inactivation of Gram-negative (Escherichia coli) and Gram-positive (Staphylococcus aureus) bacteria was evaluated. Conjugates with simpler sulfonamide units (N,N-diethylbenzenesulfonamide, N-isopropylbenzenesulfonamide and N-(4-methoxyphenyl)benzenesulfonamide) caused stronger inactivation than those with heterocyclic groups (N-(thiazol-2-yl)benzenesulfonamide) or long alkyl chains (N-dodecylbenzenesulfonamide) in both bacteria...
May 9, 2018: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29777958/sssupramolecular-poly-acrylic-acid-f127-hydrogel-with-hydration-controlled-nitric-oxide-release-for-enhancing-wound-healing
#14
Mathilde Champeau, Valéria Póvoa, Lucas Militão, Flávia Cabrini, Guilherme F Picheth, Florian Meneau, Carlos P Jara, Eliana P de Araujo, Marcelo G de Oliveira
Topical nitric oxide (NO) delivery has been shown to accelerate wound healing. However, delivering NO to wounds at appropriate rates and doses requires new biomaterial-based strategies. Here, we describe the development of supramolecular interpolymer complex hydrogels comprising PEO-PPO-PEO (F127) micelles embedded in a poly(acrylic acid) (PAA) matrix, with S-nitrosoglutathione (GSNO) molecules dissolved in the hydrophilic domain. We show that PAA:F127/GSNO hydrogels start releasing NO upon hydration at rates controlled by their rates of water absorption...
May 16, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29777957/dual-ph-reduction-responsive-hybrid-polymeric-micelles-for-targeted-chemo-photothermal-combination-therapy
#15
Linhua Zhang, Yu Qin, Zhiming Zhang, Fan Fan, Chenlu Huang, Li Lu, Hai Wang, Xu Jin, Hanxue Zhao, Deling Kong, Chun Wang, Hongfan Sun, Xigang Leng, Dunwan Zhu
The combination of chemotherapy and photothermal therapy in multifunctional nanovesicles has emerged as a promising strategy to improve cancer therapeutic efficacy. Herein, we designed new pH/reduction dual-responsive and folate decorated polymeric micelles (FA Co-PMs) as theranostic nanocarrier to co-encapsulate doxorubicin (DOX) and indocyanine green (ICG) for targeted NIR imaging and chemo-photothermal combination therapy. The Co-PMs exhibited nano-sized structure (∼100 nm) with good monodispersity, high encapsulation efficiency of both ICG and DOX, triggered DOX release in response to acid pH and reduction environment, and excellent temperature conversion with laser irradiation...
May 16, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29776184/engineering-single-polymer-micelle-shape-using-nonuniform-spontaneous-surface-curvature
#16
Brian Moths, T A Witten
Conventional micelles, composed of simple amphiphiles, exhibit only a few standard morphologies, each characterized by its mean surface curvature set by the amphiphiles. Here we demonstrate a rational design scheme to construct micelles of more general shape from polymeric amphiphiles. We replace the many amphiphiles of a conventional micelle by a single flexible, linear, block copolymer chain containing two incompatible species arranged in multiple alternating segments. With suitable segment lengths, the chain exhibits a condensed spherical configuration in solution, similar to conventional micelles...
March 2018: Physical Review. E
https://www.readbyqxmd.com/read/29775710/dual-ph-sensitive-supramolecular-micelles-from-star-shaped-pdmaema-based-on-%C3%AE-cyclodextrin-for-drug-release
#17
Zaishuai Zhou, Feng Guo, Nairong Wang, Meng Meng, Guiying Li
Star-shaped poly(2-(dimethylamino)ethyl methacrylate) based on β-cyclodextrin (β-CD-(PDMAEMA)7 ) was synthesized by means of atomic transfer radical polymerization (ATRP). Dual pH-sensitive supramolecular micelles were formed from β-CD-(PDMAEMA)7 and benzimidazole modified poly(ε-caprolactone) (BM-PCL) through the host-guest interactions between β-CD and benzimidazole. The supramolecular micelles have regular spherical structure with hydrophobic β-CD/BM-PCL as the core and pH-sensitive PDMAEMA as the shell...
May 15, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29775311/large-pamam-dendron-induces-formation-of-unusual-p4332-mesophase-in-monoolein-water-system
#18
Manoj Kumar, Naganath G Patil, Ashootosh V Ambade, Guruswamy Kumaraswamy
Compact macromolecular dendrons have been shown to induce the formation of discontinuous inverse micellar assemblies with Fd3m symmetry in monoolein/water systems. Here, we demonstrate that a large PAMAM dendron (G5: fifth generation) induces the formation a very unusual mesophase with P4332 symmetry. This mesophase had previously been observed in monoolein/water systems only on addition of cytochrome C. The P4332 mesophase can be considered an intermediate phase between the bicontinuous Ia3d and discontinuous micellar mesophases...
May 18, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29774332/tuning-the-molecular-weight-of-polymeric-amphiphiles-as-a-tool-to-access-micelles-with-a-wide-range-of-enzymatic-degradation-rates
#19
Gadi Slor, Nitsan Papo, Uri Hananel, Roey J Amir
Enyzme-responsive polymeric assemblies hold great potential for biomedical applications due to the over-expression of disease-associated enzymes, which can be utilized to activate such systems only in afflicted tissues. Herein we demonstrate that the overall molecular weight of polymeric amphiphiles, which have the same hydrophilic/hydrophobic ratio, can be tuned to create polymeric micelles with an extreme range of degradation rates. This approach expands the available set of molecular parameters that can be adjusted to tune the degradation rate of polymeric assemblies, paving new possibilities for rational design of polymeric systems with controlled degradation rates...
May 18, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29773367/reduction-active-polymeric-prodrug-micelles-based-on-%C3%AE-cyclodextrin-polyrotaxanes-for-triggered-drug-release-and-enhanced-cancer-therapy
#20
Shuang Bai, Meili Hou, Xiaoxiao Shi, Jiucun Chen, Xiaoqian Ma, Yong-E Gao, Yajun Wang, Peng Xue, Yuejun Kang, Zhigang Xu
As one of the medical polymers approved by US Food and Drug Administration (FDA), poly(ethylene glycol) has low toxicity, high stability, good biocompatibility, unique physical and chemical properties. Cyclodextrin is an ideal candidate as a drug carrier due to its special structures and characteristics. These two materials were successfully assembled through chemosynthesis in combination with the hydrophilic poly(ethylene glycol) methyl ether methacrylate (OEGMA) chain and hydrophobic polymeric camptothecin (CPT) chain by atom transfer radical polymerization (ATRP)...
August 1, 2018: Carbohydrate Polymers
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