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https://www.readbyqxmd.com/read/28806660/fluorescent-carbon-dot-gated-hollow-mesoporous-carbon-for-chemo-photothermal-synergistic-therapy
#1
Xiudan Wang, Yuanzhe Lin, Xian Li, Da Wang, Donghua Di, Qinfu Zhao, Siling Wang
An efficient and intelligent nano-carrier that combines cell imaging with near infrared (NIR) light and redox dual-responsive drug delivery was successfully prepared. The hollow mesoporous carbon (HMC) nanoparticles with high photothermal conversion ability were developed to increase the drug loading efficiency and realize chemotherapy and photothermal synergetic therapy. The photo-stable and luminescent carbon dots (CDs) were prepared from branched polyethyleneimine (PEI) by hydrothermal reaction. The PEI CDs (CDPEI) were grafted on the openings of HMC as the "gatekeepers" via disulfide units (HMC-SS-CDPEI) to prevent the premature release of doxorubicin (DOX)...
August 4, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28805422/stakeholder-perspectives-on-a-toolkit-to-enhance-caregiver-participation-in-community-based-child-mental-health-services
#2
Rachel Haine-Schlagel, Molly Mechammil, Lauren Brookman-Frazee
Client engagement in services is a critical element of effective community-based child and family mental health service delivery. Caregiver engagement is particularly important, as caregivers often serve as gatekeepers to child mental health care and typically must consent for services, facilitate service attendance, and are often the target of intervention themselves. Unfortunately, caregiver engagement has been identified as a significant challenge in community-based child mental health services. To address this gap, the Parent And Caregiver Active Participation Toolkit (PACT), which includes therapist training and participation tools for caregivers and therapists, was developed...
August 2017: Psychological Services
https://www.readbyqxmd.com/read/28805158/pp2a-regulatory-subunit-b55%C3%AE-is-a-gatekeeper-of-osteoblast-maturation-and-lineage-maintenance
#3
Anastassia Serguienko, Robert Hanes, Iwona Grad, Meng-Yu Wang, Ola Myklebost, Else Munthe
Bone marrow mesenchymal stem cells (BM MSCs) mediate skeletal remodeling by differentiating into osteoblasts. However, this remodeling is impaired with aging as well as following long-term glucocorticoid treatment, resulting in osteoporosis. Here we report a novel factor of osteoblast differentiation - PP2A regulatory subunit B55γ. We show that B55γ is induced by glucocorticoid receptor (GR) in human primary BM MSCs during differentiation to osteoblast, but not to adipocytes, and is required for osteoblast morphogenesis and mineralization...
August 12, 2017: Stem Cells and Development
https://www.readbyqxmd.com/read/28802747/the-market-for-paid-sick-leave
#4
Simen Markussen, Knut Røed
In many countries, general practitioners (GPs) are assigned the task of controlling the validity of their own patients' insurance claims. At the same time, they operate in a market where patients are customers free to choose their GP. Are these roles compatible? Can we trust that the gatekeeping decisions are untainted by private economic interests? Based on administrative registers from Norway with records on sick pay certification and GP-patient relationships, we present evidence to the contrary: GPs are more lenient gatekeepers the more competitive is the physician market, and a reputation for lenient gatekeeping increases the demand for their services...
August 1, 2017: Journal of Health Economics
https://www.readbyqxmd.com/read/28802300/media-exposure-and-parental-mediation-on-fast-food-consumption-among-children-in-metropolitan-and-suburban-indonesian
#5
May O Lwin, Shelly Malik, Hardinsyah Ridwan, Cyndy Sook Sum Au
BACKGROUND AND OBJECTIVES: Fast-food companies have been reproached for rising obesity levels due to aggressive marketing tactics targeted at children. They have countered that parents should be held responsible considering their critical role as nutritional gatekeepers. This study examined the comparative effects of media exposure and parental mediation on Indonesian children's fast food consumption and how the effects compare in the metropolitan versus suburban areas. METHODS AND STUDY DESIGN: The sample consisted of 394 child-mother pairs comprising grade three and four children and their mothers from two schools each in Jakarta and Bogor representing 40...
2017: Asia Pacific Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28800258/nasopharyngeal-microbiota-gatekeepers-or-fortune-tellers-of-susceptibility-to-respiratory-tract-infections
#6
Yvonne J Huang
No abstract text is available yet for this article.
August 11, 2017: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/28795557/nir-light-temperature-ph-and-redox-responsive-polymer-modified-reduced-graphene-oxide-mesoporous-silica-sandwich-like-nanocomposites-for-controlled-release
#7
Panjun Wang, Shuo Chen, Ziquan Cao, Guojie Wang
Here a novel quadruple-responsive nanocarrier based on reduced graphene oxide/mesoporous silica sandwich-like nanocomposites (rGO@MS) modified by pH- and temperature-responsive poly(dimethylaminoethyl methacrylate) (PDMAEMA) with a linker of disulfide was constructed via surface-initiated atom transfer radical polymerization. The polymer chains would be used as gatekeepers to control the release of the loaded cargo molecules under pH, temperature, NIR light and redox stimuli. The cargo molecules (rhodamine B) were demonstrated to release from the polymer-modified nanocomposites triggered by the quadruple-stimuli...
August 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28782530/chemotherapeutics-resistance-arms-race-an-update-on-mechanisms-involved-in-resistance-limiting-egfr-inhibitors-in-lung-cancer
#8
REVIEW
Pankaj Kumar Singh, Om Silakari
Clinical reports suggest that EGFR-mutated lung cancer usually respond significantly towards small molecule tyrosine kinase inhibitors. Same studies also report the eventual development of acquired resistance within a median time interval of 9 to 14months. One of the major mechanisms involved in this acquired resistance was found to be a secondary point mutation at gate-keeper residue, EGFR T790M. However, there are other recent studies which disclose the role of few other novel key players such as, ZEB1, TOPK etc...
August 4, 2017: Life Sciences
https://www.readbyqxmd.com/read/28777094/in-crystallo-activity-tests-with-latent-apple-tyrosinase-and-two-mutants-reveal-the-importance-of-the-mutated-sites-for-polyphenol-oxidase-activity
#9
Ioannis Kampatsikas, Aleksandar Bijelic, Matthias Pretzler, Annette Rompel
Tyrosinases are type 3 copper enzymes that belong to the polyphenol oxidase (PPO) family and are able to catalyze both the ortho-hydroxylation of monophenols and their subsequent oxidation to o-quinones, which are precursors for the biosynthesis of colouring substances such as melanin. The first plant pro-tyrosinase from Malus domestica (MdPPO1) was recombinantly expressed in its latent form (56.4 kDa) and mutated at four positions around the catalytic pocket which are believed to influence the activity of the enzyme...
August 1, 2017: Acta Crystallographica. Section F, Structural Biology Communications
https://www.readbyqxmd.com/read/28776078/sarna-mediated-activation-of-trpv5-reduces-renal-calcium-oxalate-deposition-in-rat-via-decreasing-urinary-calcium-excretion
#10
Tao Zeng, Xiaolu Duan, Wei Zhu, Yang Liu, Wenqi Wu, Guohua Zeng
Hypercalciuria is a main risk factor for kidney stone  formation. TRPV5 is the gatekeeper protein for mediating calcium transport and reabsorption in the kidney. In the present study, we tested the effect of TRPV5 activation with small activating RNA (saRNA), which could induce gene expression by targeting the promoter of the gene, on ethylene glycol (EG)-induced calcium oxalate (CaOx) crystals formation in rat kidney. Five pairs of RNA activation sequences targeting the promoter of rat TRPV5 were designed and synthesized...
August 3, 2017: Urolithiasis
https://www.readbyqxmd.com/read/28775214/organotypic-vasculature-from-descriptive-heterogeneity-to-functional-pathophysiology
#11
REVIEW
Hellmut G Augustin, Gou Young Koh
Blood vessels form one of the body's largest surfaces serving as critical interface between the circulation and the different organ environments. They thereby exert gatekeeper functions on tissue homeostasis and adaptation to pathologic challenge. Vascular control of the tissue microenvironment is indispensable in development, hemostasis, inflammation, and metabolism as well as cancer and metastasis. This multitude of vascular functions is mediated by organ-specifically differentiated endothelial cells (EC), whose cellular and molecular heterogeneity has long been recognized...
August 3, 2017: Science
https://www.readbyqxmd.com/read/28766474/a-systematic-review-of-interventions-to-prevent-suicidal-behaviors-and-reduce-suicidal-ideation-in-older-people
#12
Chukwudi Okolie, Michael Dennis, Emily Simon Thomas, Ann John
BACKGROUND: Older people have a high risk of suicide but research in this area has been largely neglected. Unlike for younger age groups, it remains unclear what strategies for prevention exist for older adults. This systematic review assesses the effectiveness of interventions to prevent suicidal behavior and reduce suicidal ideation in this age group. METHODS: MEDLINE, EMBASE, PsycINFO, Web of Science, and Cochrane Central Register of Controlled Trials (CENTRAL) were searched for relevant publications from their dates of inception until 1 April 2016...
August 2, 2017: International Psychogeriatrics
https://www.readbyqxmd.com/read/28766338/near-infrared-light-responsive-magnetic-dna-microgels-for-photon-and-magneto-manipulated-cancer-therapy
#13
Yitong Wang, Ling Wang, Miaomiao Yan, Shuli Dong, Jingcheng Hao
Functional DNA molecules have been introduced into polymer-based nanocarrier systems to incorporate chemotherapy drugs for the cancer therapy. Here is the first report the dual-responsive microgels composed of core of Au-nanorods and shell of magnetic ionic liquid and DNA moieties in the crosslinking network simultaneously as effective drug delivery vectors. TEM images indicated a magnetic polymer shell has an analogous "doughnut" shape which is loosely surrounded around the AuNRs core. When irradiated with a near-infrared-light (NIR) laser, Au-nanorods are the motors which convert the light to the heat, leading to the release of the encapsulated payloads with high controllability...
August 2, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28761044/resveratrol-reverses-the-warburg-effect-by-targeting-the-pyruvate-dehydrogenase-complex-in-colon-cancer-cells
#14
Elise Saunier, Samantha Antonio, Anne Regazzetti, Nicolas Auzeil, Olivier Laprévote, Jerry W Shay, Xavier Coumoul, Robert Barouki, Chantal Benelli, Laurence Huc, Sylvie Bortoli
Resveratrol (RES), a polyphenol found in natural foods, displays anti-oxidant, anti-inflammatory and anti-proliferative properties potentially beneficial in cancers, in particular in the prevention of tumor growth. However, the rapid metabolism of resveratrol strongly limits its bioavailability. The molecular mechanisms sustaining the potential biological activity of low doses of resveratrol has not been extensively studied and, thus, needs better characterization. Here, we show that resveratrol (10 µM, 48 hr) induces both a cell growth arrest and a metabolic reprogramming in colon cancer cells...
July 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28754637/the-perilipin-family-of-lipid-droplet-proteins-gatekeepers-of-intracellular-lipolysis
#15
REVIEW
Carole Sztalryd, Dawn L Brasaemle
Lipid droplets in chordates are decorated by two or more members of the perilipin family of lipid droplet surface proteins. The perilipins sequester lipids by protecting lipid droplets from lipase action. Their relative expression and protective nature is adapted to the balance of lipid storage and utilization in specific cells. Most cells of the body have tiny lipid droplets with perilipins 2 and 3 at the surfaces, whereas specialized fat-storing cells with larger lipid droplets also express perilipins 1, 4, and/or 5...
July 25, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28754309/retinoic-acid-cyp26-and-drug-resistance-in-the-stem-cell-niche
#16
REVIEW
Salvador Alonso, Richard J Jones, Gabriel Ghiaur
The bone marrow niche is essential for hematopoietic stem cells to maintain lifelong blood production, by balancing their self-renewal and differentiation. Hematologic malignancies have a similar hierarchical organization to their normal counterparts, with rare populations of cancer stem cells that rely on the microenvironment to survive and propagate their differentiated malignant progenitor cells. Cancer cells alter their microenvironment to create a supportive niche where they endure chemotherapy, survive as minimal residual disease, and eventually prevail at relapse...
July 25, 2017: Experimental Hematology
https://www.readbyqxmd.com/read/28754155/magnetic-resonance-adenosine-perfusion-imaging-as-gatekeeper-of-invasive-coronary-intervention-magnet-study-protocol-for-a-randomized-controlled-trial
#17
Dominik Buckert, Simon Witzel, Maciej Cieslik, Raid Tibi, Wolfgang Rottbauer, Peter Bernhardt
BACKGROUND: Current guidelines for the diagnosis and management of patients with stable coronary artery disease (CAD) recommend functional stress testing for risk stratification prior to revascularization procedures. Cardiac magnetic resonance imaging (CMR) is a modality of choice for stress testing because of its capability to detect myocardial ischemia sensitively and specifically. Nevertheless, evidence from randomized trials evaluating a CMR-based management of stable CAD patients in comparison to a more common angiography-based approach still is limited...
July 28, 2017: Trials
https://www.readbyqxmd.com/read/28750325/cryo-em-maps-reveal-five-fold-channel-structures-and-their-modification-by-gatekeeper-mutations-in-the-parvovirus-minute-virus-of-mice-mvm-capsid
#18
Suriyasri Subramanian, Lindsey J Organtini, Alec Grossman, Phillip P Domeier, Javier O Cifuente, Alexander M Makhov, James F Conway, Anthony D'Abramo, Susan F Cotmore, Peter Tattersall, Susan Hafenstein
In minute virus of mice (MVM) capsids, icosahedral five-fold channels serve as portals mediating genome packaging, genome release, and the phased extrusion of viral peptides. Previous studies suggest that residues L172 and V40 are essential for channel function. The structures of MVMi wildtype, and mutant L172T and V40A virus-like particles (VLPs) were solved from cryo-EM data. Two constriction points, termed the mid-gate and inner-gate, were observed in the channels of wildtype particles, involving residues L172 and V40 respectively...
July 24, 2017: Virology
https://www.readbyqxmd.com/read/28744019/estrogen-regulates-bone-turnover-by-targeting-rankl-expression-in-bone-lining-cells
#19
Carmen Streicher, Alexandra Heyny, Olena Andrukhova, Barbara Haigl, Svetlana Slavic, Christiane Schüler, Karoline Kollmann, Ingrid Kantner, Veronika Sexl, Miriam Kleiter, Lorenz C Hofbauer, Paul J Kostenuik, Reinhold G Erben
Estrogen is critical for skeletal homeostasis and regulates bone remodeling, in part, by modulating the expression of receptor activator of NF-κB ligand (RANKL), an essential cytokine for bone resorption by osteoclasts. RANKL can be produced by a variety of hematopoietic (e.g. T and B-cell) and mesenchymal (osteoblast lineage, chondrocyte) cell types. The cellular mechanisms by which estrogen acts on bone are still a matter of controversy. By using murine reconstitution models that allow for selective deletion of estrogen receptor-alpha (ERα) or selective inhibition of RANKL in hematopoietic vs...
July 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28743859/let-7-microrna-dependent-control-of-leukotriene-signaling-regulates-the-transition-of-hematopoietic-niche-in-mice
#20
Xuan Jiang, John S Hawkins, Jerry Lee, Carlos O Lizama, Frank L Bos, Joan P Zape, Prajakta Ghatpande, Yongbo Peng, Justin Louie, Giorgio Lagna, Ann C Zovein, Akiko Hata
Hematopoietic stem and progenitor cells arise from the vascular endothelium of the dorsal aorta and subsequently switch niche to the fetal liver through unknown mechanisms. Here we report that vascular endothelium-specific deletion of mouse Drosha (Drosha (cKO)), an enzyme essential for microRNA biogenesis, leads to anemia and death. A similar number of hematopoietic stem and progenitor cells emerge from Drosha-deficient and control vascular endothelium, but Drosha (cKO)-derived hematopoietic stem and progenitor cells accumulate in the dorsal aorta and fail to colonize the fetal liver...
July 25, 2017: Nature Communications
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