Molecules, Vol. 25, Pages 890: Silk Particle Production Based on silk/PVA Phase Separation Using a Microfabricated Co-flow Device

In this study, polydimethylsiloxane-based microfluidic devices were designed, fabricated, and characterized to produce silk particles through self-association of silk when exposed to PVA. Three main variables resulted in differences in particle size and size distribution, or polydispersity index (PDI). Utilizing a co-flow microfluidic device decreased the PDI of the silk particles as compared to an emulsion-based method (0.13 versus 0.65, respectively). With a flow-focusing microfluidics device, lowering the silk flow rate from 0.80 to 0.06 mL/h resulted in a decrease in the median particle size from 6.8 to 3.0 μm and the PDI from 0.12 to 0.05, respectively. Lastly, decreasing the silk concentration from 12% to 2% resulted in a decrease in the median particle size from 5.6 to 2.8 μm and the PDI from 0.81 to 0.25, respectively. Binding and release of doxorubicin, a cytotoxic drug commonly used for cancer treatment, with the fabricated silk particles was evaluated. Doxorubicin loading in the silk particles was approximately 41 µg/mg; sustained doxorubicin release occurred over 23 days. When the cytotoxicity of the released doxorubicin was tested on KELLY neuroblastoma cells, significant cell death was observed. To demonstrate the potential for internalization of the silk particles, both KELLY and THP-1-derived macrophages were exposed to fluorescently labelled silk particles for up to 24 h. With the macrophages, internalization of the silk particles was ...
Source: Molecules - Category: Chemistry Authors: Tags: Article Source Type: research

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Abstract Cytokine-like protein 1 (Cytl1), also named Protein C17 or C4orf4 is located on human chromosome 4p15-p16 and encodes a polypeptide of 126 amino acid residues that displays characteristics of a secretory protein. Cytl1 is expressed by a sub-population of CD34+ human mononuclear cells from bone marrow and cord blood, and by chondrocytes (cartilage-forming cells). In this review, we explore evidence suggesting that Cytl1 may be involved in the regulation of chondrogenesis, cartilage homeostasis and osteoarthritis progression, accompanied by the modulation of Sox9 and insulin-like growth factor 1 expression....
Source: Cellular and Molecular Life Sciences : CMLS - Category: Cytology Authors: Tags: Cell Mol Life Sci Source Type: research
Conclusion MTDH is pro-oncogenic factor playing multifaceted and diverse roles in cancer progression. Its association and central role in regulating signaling pathways such a MAPK, wnt/β-catenin, PI3K/AkT, NF-κβ pathways in various cancers shows that it plays a vital role in metastasis. MTDH contribution to chemo and radiotherapy resistance provides a new direction for the development of anticancer therapeutics. Multiple mechanisms converge to promote expression of MTDH in cancers. Further studies are therefore warranted to determine whether the elevated MTDH expression has prognostic value for development...
Source: Frontiers in Oncology - Category: Cancer & Oncology Source Type: research
In conclusion, potential biological applications of PF-SeNPs were explored by antibacterial, antifungal, antioxidant and biocompatibility assays. Materials and Methods Chemicals and Reagents Sodium selenite (98%), 2,2-diphenyl-1-picrylhydrazyl (DPPH), 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) (MTT), Tween 80, methanol, acetate buffer, tetracycline, nystatin, rhodamine 123, caspase-3 kit, Dulbecco’s modified Eagle media (DMEM), Folin-Ciocalteu reagent, 2,2-azinobis-(3-ethylbenzothiazoline-6-sulfonate) (ABTS), Dulbecco’s phosphate buffered saline pH 7.4 (DPBS) and fetal bovine serum (FBS) w...
Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
Conclusion The expression of the components of the PTN-MK-RPTPβ/ζ axis in immune cells and in inflammatory diseases suggests important roles for this axis in inflammation. Pleiotrophin has been recently identified as a limiting factor of metainflammation, a chronic pathological state that contributes to neuroinflammation and neurodegeneration. Pleiotrophin also seems to potentiate acute neuroinflammation independently of the inflammatory stimulus while MK seems to play different -even opposite- roles in acute neuroinflammation depending on the stimulus. Which are the functions of MK and PTN in chronic neuroinfla...
Source: Frontiers in Pharmacology - Category: Drugs & Pharmacology Source Type: research
Publication date: Available online 14 February 2019Source: NeuroscienceAuthor(s): Bárbara Paranhos Coelho, Mariana Maier Gaelzer, Fernanda dos Santos Petry, Juliana Bender Hoppe, Vera Maria Treis Trindade, Christianne G. Salbego, Fátima T.C.R. GumaAbstractSeveral studies have demonstrated the antitumor effect of doxazosin, an α1-adrenergic blocker, against glioma and breast, bladder and prostate cancers. Doxazosin is also being evaluated as a treatment for posttraumatic stress disorder and alcoholism, and α1-adrenergic blockers have been linked to neuroprotection in neurodegenerative disorders, su...
Source: Neuroscience - Category: Neuroscience Source Type: research
Abstract Transcription factor Nrf1 acts as a unique vital player in maintaining cellular homeostasis and organ integrity during normal development and growth throughout the life process. Loss-of-function of Nrf1 results in severe oxidative stress, genomic instability, embryonic lethality, developmental disorders, and adult diseases such as non-alcoholic steatohepatitis, hepatocellular carcinoma, diabetes and neurogenerative diseases. Thereby, Nrf1 is critically implicated in a variety of important physio-pathological processes by governing robust target genes in order to reinforce antioxidant, detoxification and c...
Source: Toxicology and Applied Pharmacology - Category: Toxicology Authors: Tags: Toxicol Appl Pharmacol Source Type: research
AbstractPurpose of ReviewIn this paper, we summarize prior studies that have used Mendelian randomization (MR) methods to study the effects of exposures, lifestyle factors, physical traits, and/or biomarkers on cancer risk in humans. Many such risk factors have been associated with cancer risk in observational studies, and the MR approach can be used to provide evidence as to whether these associations represent causal relationships. MR methods require a risk factor of interest to have known genetic determinants that can be used as proxies for the risk factor (i.e., “instrumental variables” or IVs), and these c...
Source: Current Epidemiology Reports - Category: Epidemiology Source Type: research
Discussion Flushing is usually thought of as a benign condition such as blushing, but can be quite irritating if it is frequent or persistent (i.e. menopausal hot flashes) or even pathologic (i.e. malignancy). “Flushing is a subjective and sensation of warmth that is accompanied by reddening of the skin anywhere on the body but favors the face, neck, and upper torso…. Flushing can be broadly divided into episodic or persistent. Episodic flashing is mediated by the release of endogenous vasoactive mediators or medications, while persistent flushing result in a fixed facial erythema with telangiectasias and cyan...
Source: PediatricEducation.org - Category: Pediatrics Authors: Tags: Uncategorized Source Type: news
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Source: Science - The Huffington Post - Category: Science Source Type: news
Conclusion: The antimalarial agent OZ513 has promising activity against the chemoresistant neuroblastoma cell-line BE-2c by increasing apoptosis by mechanisms that remain unclear, but increased cell cycle aneuploidy with treatment of cells with 5 mcg/ml of OZ513 indicates defects in mitosis and cytokinesis.Citation Format: Don W. Coulter, Timothy R. McGuire, John G. Sharp, Yuxiang Dong, Xiaofang Wang, Erin McIntyre, Xiaoyu Chen, Jon Vennerstrom. Treatment of a chemoresistant human neuroblastoma cell-line (BE-2c) with experimental ozonide antimalarials. [abstract]. In: Proceedings of the AACR Special Conference on Advances ...
Source: Cancer Research - Category: Cancer & Oncology Authors: Tags: Targeted Therapeutics and Resistance Source Type: research
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