Lipid nanoparticles (LNPs) have shown promise as delivery vehicles for therapeutic oligonucleotides, including antisense oligos (ONs), siRNA, and microRNA mimics and inhibitors. In addition to a ...cationic lipid, LNPs are typically composed of helper lipids that contribute to their stability and delivery efficiency. Helper lipids with cone-shape geometry favoring the formation hexagonal II phase, such as dioleoylphosphatidylethanolamine (DOPE), can promote endosomal release of ONs. Meanwhile, cylindrical-shaped lipid phosphatidylcholine can provide greater bilayer stability, which is important for in vivo application of LNPs. Cholesterol is often included as a helper that improves intracellular delivery as well as LNP stability in vivo. Inclusion of a PEGylating lipid can enhance LNP colloidal stability in vitro and circulation time in vivo but may reduce uptake and inhibit endosomal release at the cellular level. This problem can be addressed by choosing reversible PEGylation in which the PEG moiety is gradually released in blood circulation. pH-sensitive anionic helper lipids, such as fatty acids and cholesteryl hemisuccinate (CHEMS), can trigger low-pH-induced changes in LNP surface charge and destabilization that can facilitate endosomal release of ONs. Generally speaking, there is no correlation between LNP activity in vitro and in vivo because of differences in factors limiting the efficiency of delivery. Designing LNPs requires the striking of a proper balance between the need for particle stability, long systemic circulation time, and the need for LNP destabilization inside the target cell to release the oligonucleotide cargo, which requires the proper selection of both the cationic and helper lipids. Customized design and empirical optimization is needed for specific applications.
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Respiratory cilia are the driving force of the mucociliary escalator, working in conjunction with secreted airway mucus to clear inhaled debris and pathogens from the conducting airways. Respiratory ...cilia are also one of the first contact points between host and inhaled pathogens. Impaired ciliary function is a common pathological feature in patients with chronic airway diseases, increasing susceptibility to respiratory infections. Common respiratory pathogens, including viruses, bacteria, and fungi, have been shown to target cilia and/or ciliated airway epithelial cells, resulting in a disruption of mucociliary clearance that may facilitate host infection. Despite being an integral component of airway innate immunity, the role of respiratory cilia and their clinical significance during airway infections are still poorly understood. This review examines the expression, structure, and function of respiratory cilia during pathogenic infection of the airways. This review also discusses specific known points of interaction of bacteria, fungi, and viruses with respiratory cilia function. The emerging biological functions of motile cilia relating to intracellular signaling and their potential immunoregulatory roles during infection will also be discussed.
Curcumin (CUR) is a yellow polyphenolic compound derived from the plant turmeric. It is widely used to treat many types of diseases, including cancers such as those of lung, cervices, prostate, ...breast, bone and liver. However, its effectiveness has been limited due to poor aqueous solubility, low bioavailability and rapid metabolism and systemic elimination. To solve these problems, researchers have tried to explore novel drug delivery systems such as liposomes, solid dispersion, microemulsion, micelles, nanogels and dendrimers. Among these, liposomes have been the most extensively studied. Liposomal CUR formulation has greater growth inhibitory and pro-apoptotic effects on cancer cells. This review mainly focuses on the preparation of liposomes containing CUR and its use in cancer therapy.
This study examines the impact of board diversity on firms' corporate social responsibility (CSR) performance. Using seven different measures of board diversity across 1,489 U.S. firms from 1999 to ...2011, the study finds that board diversity is positively associated with CSR performance. Board diversity is associated with a greater number of areas in which CSR is strong and a fewer number of areas in which CSR is a concern. These findings support the stakeholder theory and are consistent with the view that board diversity enhances firms' ability to satisfy the needs of their broader groups of stakeholders. We find that gender, tenure, and expertise diversities seem to be the driving factors of firms' CSR activities. Furthermore, we find that board diversity significantly increases CSR performance by increasing CSR strengths and reducing CSR concerns for firms producing consumer-oriented products and firms operating in more competitive industries. Our results remain robust using different measures of CSR performance, different estimation methods, and different samples.
Literary value – in the sense of the worth, usefulness or importance of the literary – has been a topic of debate from no later than Plato’s impugning of poetry. But from the so-called canon wars of ...the last century to the present, literary value has also become a perplexing source of distress. With its complicities thoroughly unmasked, it no longer axiomatically serves as literary study’s central justification. Yet no consensus alternative has taken its place. This book, unlike other approaches to the topic, neither pursues an apologetic thesis about the most defining values of literature nor conversely provides a demystifying account of the ideological uses of specific ascribed values. Instead, arguing that the category of literary value is ultimately inescapable, it focuses pragmatically on everyday scholarly and pedagogical activities, proposing how we may reconcile that category’s inevitability with our understandable wariness of its intractable uncertainties and complicities. Toward these ends, it offers a preliminary theory of literary valuing and explores the problem of literary value and possible responses in respect to the literary edition, canonicity and interpretation. Much of this exploration occurs within Chaucer studies, which, because of Chaucer’s simultaneous canonicity and marginality, provides fertile ground for thinking through the problem’s challenges. The book thereby also supplies an extended reflection on the state of Chaucer studies. In using this subfield as a kind of synecdoche for the field as a whole, the book seeks to forge a viable rationale for literary studies within and without the academy.
Hepatocellular carcinoma (HCC) remains one of the major causes of cancer related deaths. Although ultrasonography (US), computed tomography (CT) and/or high-cost magnetic resonance imaging (MRI) have ...been shown to improve early detection of liver cancer and mortality rates in high-risk individuals, such imaging based methods are limited by high rates of false positivity leading to unnecessary patient anxiety and invasive procedures. Complementary blood biomarkers could increase the accuracy of early detection. Although Alpha-fetoprotein (AFP) in blood is widely used in HCC screening and diagnosis, the false-negative rate as high as 30% and 40% is found in advanced HCC and early stage HCC respectively. We detected AFP messenger RNA (mRNA) in extracellular vesicles (EVs) in patient plasma using designed molecular beacons and a novel tethered lipoplex nanoparticle (TLN) biochip. Together with glypican-3 (GPC-3) mRNA, another well-known HCC marker, we observed much improved performance of AFP protein-based HCC detection. Comparing normal donors (N = 38) and HCC patients (N = 40), our TLN biochip using EV AFP and GPC-3 mRNAs provided an AUC (area under the ROC curve) of 0.995, better than that of a single marker. This 2-mRNA combination also provided a perfect positive predictive value (PPV = 1) at a negative predictive value (NPV) of 0.95 and 20% prevalence, while the blood AFP protein or plasma EV GPC3 mRNA alone could only provide a PPV of 0.61 and 0.79 respectively at the same conditions. Thus, this facile new method may complement current models for risk stratification in liver cancer screening, therapeutic monitoring, and after-treatment surveillance. However, large scale validation will need to be conducted to confirm its clinical potential.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
We aimed to update a previously published, multi-institutional nomogram of outcomes for salvage radiotherapy (SRT) following radical prostatectomy (RP) for prostate cancer, including patients treated ...in the contemporary era.
Individual data from node-negative patients with a detectable post-RP prostate-specific antigen (PSA) treated with SRT with or without concurrent androgen-deprivation therapy (ADT) were obtained from 10 academic institutions. Freedom from biochemical failure (FFBF) and distant metastases (DM) rates were estimated, and predictive nomograms were generated.
Overall, 2,460 patients with a median follow-up of 5 years were included; 599 patients (24%) had a Gleason score (GS) ≤ 6, 1,387 (56%) had a GS of 7, 244 (10%) had a GS of 8, and 230 (9%) had a GS of 9 to 10. There were 1,370 patients (56%) with extraprostatic extension (EPE), 452 (18%) with seminal vesicle invasion (SVI), 1,434 (58%) with positive surgical margins, and 390 (16%) who received ADT (median, 6 months). The median pre-SRT PSA was 0.5 ng/mL (interquartile range, 0.3 to 1.1). The 5-yr FFBF rate was 56% overall, 71% for those with a pre-SRT PSA level of 0.01 to 0.2 ng/mL (n = 441), 63% for those with a PSA of 0.21 to 0.50 ng/mL (n = 822), 54% for those with a PSA of 0.51 to 1.0 ng/mL (n = 533), 43% for those with a PSA of 1.01 to 2.0 ng/mL (n = 341), and 37% for those with a PSA > 2.0 ng/mL (n = 323); P < .001. On multivariable analysis, pre-SRT PSA, GS, EPE, SVI, surgical margins, ADT use, and SRT dose were associated with FFBF. Pre-SRT PSA, GS, SVI, surgical margins, and ADT use were associated with DM, whereas EPE and SRT dose were not. The nomogram concordance indices were 0.68 (FFBF) and 0.74 (DM).
Early SRT at low PSA levels after RP is associated with improved FFBF and DM rates. Contemporary nomograms can estimate individual patient outcomes after SRT in the modern era.
Nanomedicine is an emerging therapeutic modality. Nanoparticles (NPs) are potential vehicles for delivery of anticancer therapeutics. NPs can be designed to facilitate tumor drug delivery both by ...passive and active targeting mechanisms. Passive targeting of NPs to tumors can be achieved through the enhanced permeability and retention (EPR) effect. Meanwhile, actively targeted NPs can be designed based on two different targeting mechanisms, ligand-directed targeting to the tumor cells and tumor microenvironment (TME)-directed targeting.
We searched for and reviewed recently published literature on actively targeted NPs. Progress in this field was summarized in several focus areas, including methods for targeting of tumor cells and for targeting TME. Advantages and limitations of each approach were discussed.
This article covers data from 240 recent publications and provided numerous examples of ligand-directed NPs targeting tumor cell-selective surface receptors. Targeting ligands discussed include proteins such as transferrin and antibodies, as well as low molecular weight agents, such as peptides, aptamers, carbohydrates, and folate. In addition, extensive discussions of TME targeting NPs, designed to release drug in response to TME-specific stimuli, such as low pH, tumor-selective enzymes, and unique characteristics of tumor neovasculature, are also included in this review. In general, many novel actively targeting strategies have been developed and encouraging data have been reported in numerous settings, both in vitro and in animal studies.
Active targeting of NPs has experienced rapid growth as a field of research and is continuously expanding. There are now some early examples of efforts on clinical translation and reported clinical trials on these NPs. Future development of actively targeted NPs depends on better understanding of the many factors affecting the behavior of NPs in vivo and likely involves combining the approaches of targeting the tumor cells and of targeting components of the TME.
Cell-penetrating peptides (CPPs) are short peptides (fewer than 30 amino acids) that have been predominantly used in basic and preclinical research during the last 30 years. Since they are not only ...capable of translocating themselves into cells but also facilitate drug or CPP/cargo complexes to translocate across the plasma membrane, they have potential applications in the disease diagnosis and therapy, including cancer, inflammation, central nervous system disorders, otologic and ocular disorders, and diabetes. However, no CPPs or CPP/cargo complexes have been approved by the US Food and Drug Administration (FDA). Many issues should be addressed before translating CPPs into clinics. In this review, we summarize recent developments and innovations in preclinical studies and clinical trials based on using CPP for improved delivery, which have revealed that CPPs or CPP-based delivery systems present outstanding diagnostic therapeutic delivery potential.
Chronic rhinosinusitis pathogenesis Stevens, Whitney W., MD, PhD; Lee, Robert J., PhD; Schleimer, Robert P., PhD ...
Journal of allergy and clinical immunology,
12/2015, Letnik:
136, Številka:
6
Journal Article
Recenzirano
Odprti dostop
There are a variety of medical conditions associated with chronic sinonasal inflammation, including chronic rhinosinusitis (CRS) and cystic fibrosis. In particular, CRS can be divided into 2 major ...subgroups based on whether nasal polyps are present or absent. Unfortunately, clinical treatment strategies for patients with chronic sinonasal inflammation are limited, in part because the underlying mechanisms contributing to disease pathology are heterogeneous and not entirely known. It is hypothesized that alterations in mucociliary clearance, abnormalities in the sinonasal epithelial cell barrier, and tissue remodeling all contribute to the chronic inflammatory and tissue-deforming processes characteristic of CRS. Additionally, the host innate and adaptive immune responses are also significantly activated and might be involved in pathogenesis. Recent advancements in the understanding of CRS pathogenesis are highlighted in this review, with special focus placed on the roles of epithelial cells and the host immune response in patients with cystic fibrosis, CRS without nasal polyps, or CRS with nasal polyps.
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