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https://www.readbyqxmd.com/read/29045142/measuring-intracellular-secondary-structure-of-a-cell-penetrating-peptide-in-situ
#1
Frederik Fleissner, Sabine Pütz, Mischa Schwendy, Mischa Bonn, Sapun H Parekh
Cell penetrating peptides (CPPs) are short peptide sequences that can translocate across cellular plasma membranes and are thus potential delivery vectors for diagnostic and therapeutic applications. Many CPPs exhibit some sort structural polymorphism, where the secondary structure of the peptide is altered strongly by its local environment, which is believed to facilitate membrane translocation. However, the fate and structure of CPPs within cells is much less known due to measurement difficulty. Here we employ isotopic labelling combined with hyperspectral, quantitative coherent-Raman vibrational microscopy to localize a model CPP - deuterated Penetratin (d-Pen) - and determine its secondary structure in different cellular compartments...
October 18, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29043544/icp-versus-laser-doppler-cerebrovascular-reactivity-indices-to-assess-brain-autoregulatory-capacity
#2
F A Zeiler, J Donnelly, D Cardim, D K Menon, P Smielewski, M Czosnyka
BACKGROUND: To explore the relationship between various autoregulatory indices in order to determine which approximate small vessel/microvascular (MV) autoregulatory capacity most accurately. METHODS: Utilizing a retrospective cohort of traumatic brain injury patients (N = 41) with: transcranial Doppler (TCD), intracranial pressure (ICP) and cortical laser Doppler flowmetry (LDF), we calculated various continuous indices of autoregulation and cerebrovascular responsiveness: A...
October 17, 2017: Neurocritical Care
https://www.readbyqxmd.com/read/29039950/calorimetric-and-spectroscopic-studies-of-the-effects-of-the-cell-penetrating-peptide-pep-1-and-the-antimicrobial-peptide-combi-2-on-vesicles-of-mimicking-escherichia-coli-membrane
#3
Nsoki Phambu, Bashiyar Almarwani, Amjad Alwadai, Esther Nzuzi Phambu, Natalie Faciane, Carmel Marion, Anderson Sunda-Meya
The objective of this study is to measure and compare the effects of the cell penetrating peptide (CPP) Pep-1 and the antimicrobial peptide (AMP) combi-2 on vesicles of membranes mimicking Escherichia coli (E. coli). To characterize the effects of Pep-1 and combi-2 on E. coli membrane vesicles, a combination of five biophysical techniques was employed: fluorescence, infrared, scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC) techniques. Upon addition of E...
October 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29037897/overcoming-multiple-gastrointestinal-barriers-by-bilayer-modified-hollow-mesoporous-silica-nanocarriers
#4
Ying Wang, Yating Zhao, Yu Cui, Qinfu Zhao, Qiang Zhang, Sara Musetti, Karina A Kinghorn, Siling Wang
Oral administration of nanocarriers remains a significant challenge in the pharmaceutical sciences. The nanocarriers must efficiently overcome multiple gastrointestinal barriers including the harsh gastrointestinal environment, the mucosal layer, and the epithelium. Neutral hydrophilic surfaces are reportedly necessary for mucus permeation, but hydrophobic and cationic surfaces are important for efficient epithelial absorption. To accommodate these conflicting surface property requirements, we developed a strategy to modify nanocarrier surfaces with cationic cell-penetrating peptides (CPP) concealed by a hydrophilic succinylated casein (SCN) layer...
October 13, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29032350/identifying-characteristics-of-the-most-severely-impaired-chronic-pain-patients-treated-at-a-specialized-inpatient-pain-clinic
#5
Eva-Britt Hysing, Lena Smith, Mans Thulin, Rolf Karlsten, Stephen Butler, Torsten Gordh
BACKGROUND AND AIMS: Patients suffering from chronic nonmalignant pain constitute a heterogeneous population in terms of clinical presentation and treatment results. Few data are available about what distinguishes different groups in this huge population of patients with chronic persistent pain (CPP). A subgroup that is poorly studied, consists of the most severely impaired chronic pain patients. At the Uppsala University Hospital Pain Clinic, there is a specialized department accepting the most complex patients for rehabilitation...
October 12, 2017: Scandinavian Journal of Pain
https://www.readbyqxmd.com/read/29032210/chemical-composition-of-cyclocarya-paliurus-polysaccharide-and-inflammatory-effects-in-lipopolysaccharide-stimulated-raw264-7-macrophage
#6
Lei-Xiong, Ke-Hui Ouyang, Yan-Jiang, Zhan-Wei Yang, Wen-Bing Hu, Hui-Chen, Ning-Wang, Xin-Liu, Wen-Jun Wang
This study was designed to study the chemical composition of Cyclocarya paliurus polysaccharide and inflammatory effects in lipopolysaccharide (LPS)-stimulated RAW264.7 macrophage. A new elution (0.3% NaCl aqueous solution) of Cyclocarya paliurus polysaccharide (CPP-3) was characterized by different methods such as fourier transform infrared spectra (FT-IR), UV-vis, gas chromatography-mass spectrometry (GC-MS), high performance gel chromatography (HPGLC) and scanning electron microscopy (SEM). Cell viability was measured by MTT test, phagocytosis assay was measured by Neutral red uptake assay, nitrite was measured by Griess assay, TNF-α and IL-1β analysis were measured by ELISA, PGE2 was measured by enzyme immunoassay system...
October 12, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29031895/chronic-pelvic-pain-in-an-interdisciplinary-setting-1-year-prospective-cohort
#7
Catherine Allaire, Christina Williams, Sonja Bodmer-Roy, Sean Zhu, Kristina Arion, Kristin Ambacher, Jessica Wu, Ali Yosef, Fontayne Wong, Heather Noga, Susannah Britnell, Holly Yager, Mohamed A Bedaiwy, Arianne Y Albert, Sarka Lisonkova, Paul J Yong
BACKGROUND: Chronic pelvic pain affects ∼15% of women, and presents a challenging problem for gynecologists due to its complex etiology involving multiple comorbidities. Thus an interdisciplinary approach has been proposed for chronic pelvic pain, where these multifactorial comorbidities can be addressed by different interventions at a single integrated center. Moreover, while cross-sectional studies can provide some insight into the association between these comorbidities and chronic pelvic pain severity, prospective longitudinal cohorts can identify comorbidities that are associated with changes in chronic pelvic pain severity over time...
October 11, 2017: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/29031851/constitutive-ret-signaling-leads-to-long-lasting-expression-of-amphetamine-induced-place-conditioning-via-elevation-of-mesolimbic-dopamine
#8
Jaakko Kopra, Marian Villarta-Aguilera, Mari Savolainen, Samo Weingerl, Timo T Myöhänen, Saara Rannanpää, Michael F Salvatore, Jaan-Olle Andressoo, T Petteri Piepponen
Addictive drugs enhance dopamine release in the striatum, which can lead to compulsive drug-seeking after repeated exposure. Glial cell line-derived neurotrophic factor (GDNF) is an important regulator of midbrain dopamine neurons, and may play a mechanistic role in addiction-related behaviors. To elucidate the components of GDNF-signaling that contribute to addiction-related behaviors of place preference and its extinction, we utilized two genetically modified GDNF mouse models in an amphetamine-induced conditioned place preference (CPP) paradigm and evaluated how the behavioral findings correlate with dopamine signaling in the dorsal and ventral striatum...
October 12, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/29026300/noncovalent-interaction-assisted-drug-delivery-system-with-highly-efficient-uptake-and-release-of-paclitaxel-for-anticancer-therapy
#9
Yuping Wei, Liang Ma, Liang Zhang, Xia Xu
An effective drug delivery system requires efficient drug uptake and release inside cancer cells. Here, we report a novel drug delivery system, in which paclitaxel (PTX) interacts with a novel cell penetrating peptide (CPP) through noncovalent interaction designed based on molecular simulations. This CPP/PTX complex confers high efficiency in delivering PTX into cancer cells not by endocytosis but by an energy-independent pathway. Once inside cells, the noncovalent interaction between PTX and the CPP may allow fast release of PTX within cells due to the direct translocation of CPP/PTX...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29025204/insulin-resistance-and-bone-age-advancement-in-girls-with-central-precocious-puberty
#10
Jin Ho Hur, Sora Park, Mo Kyung Jung, Seok Jin Kang, Ahreum Kwon, Hyun Wook Chae, Ho-Seong Kim, Duk Hee Kim
PURPOSE: Precocious puberty has significantly increased recently. While obesity is associated with puberty timing, the relationship between obesity and central precocious puberty (CPP) remains controversial. The purpose of this study was to determine whether insulin resistance is associated with bone age (BA) advancement in girls with CPP. METHODS: We retrospectively analyzed the records of 804 girls referred for puberty evaluation. Anthropometric measurements, BA, sex hormone, sex hormone binding globulin (SHBG), and insulin levels, lipid profiles, and gonadotropin releasing hormone stimulation tests were assessed...
September 2017: Annals of Pediatric Endocrinology & Metabolism
https://www.readbyqxmd.com/read/29025041/trigger-points-pressure-pain-hyperalgesia-and-mechanosensitivity-of-neural-tissue-in-women-with-chronic-pelvic-pain
#11
Pedro Fuentes-Márquez, Marie Carmen Valenza, Irene Cabrera-Martos, Ana Ríos-Sánchez, Olga Ocón-Hernández
Objectives: This study aims to evaluate the presence of myofascial trigger points (TrPs), widespread pressure pain sensitivity, and mechanosensitivity of neural tissue in women with chronic pelvic pain. Design: Case-control study. Setting: Faculty of Health Sciences. Subjects: Forty women with chronic pelvic pain between age 18 and 60 years and 40 matched healthy controls were included in the study. Methods: TrPs were bilaterally explored in gluteus maximus, gluteus medius, gluteus minimus, quadratus lumborum, and adductor magnus muscles...
August 25, 2017: Pain Medicine: the Official Journal of the American Academy of Pain Medicine
https://www.readbyqxmd.com/read/29024680/uridine-attenuates-morphine-induced-conditioned-place-preference-and-regulates-glutamate-gaba-levels-in-mpfc-of-mice
#12
Ping Liu, Xiaohang Che, Lisha Yu, Xiaofeng Yang, Nina An, Wu Song, Chunfu Wu, Jingyu Yang
Several lines of evidence suggest that uridine, as a neuromodulator, plays an important role in drug addiction. We previously found that uridine circumvents morphine-induced behavioral sensitization by decreasing the extracellular dopamine levels in the dorsal striatum. In the present study, the effects of uridine on morphine-induced conditioned place preference (CPP) and the possible roles of glutamate and GABA in the stress-induced reinstatement of CPP were investigated. First, the effects of uridine (1, 10 and 100mg/kg, i...
October 9, 2017: Pharmacology, Biochemistry, and Behavior
https://www.readbyqxmd.com/read/29023621/bond-strength-of-self-adhering-materials-effect-of-dentin-desensitizing-treatment-with-a-cpp-acp-paste
#13
Fereshteh Shafiei, Reza Derafshi, Mahtab Memarpour
This study investigated the effect of dentin-desensitizing treatment with a casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) paste on shear bond strength (SBS) of two types of self-adhering (SA) restorative materials: resin-modified glass-ionomer (Fuji II LC, GC) and self-adhering flowable composite resin (Vertise Flow, Kerr). Flat and smear layer-free dentin surfaces from 48 extracted molars were prepared and divided into four groups (n = 12 per group) according to Fuji II LC or Vertise Flow and CPP-ACP pretreatment or not...
November 2017: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/28994180/a-conjugate-of-an-anti-egfr-vhh-and-a-cell-penetrating-peptide-drives-receptor-internalization-and-blocks-egfr-activation
#14
Sanne van Lith, Dirk van den Brand, Rike Wallbrecher, Sander van Duijnhoven, Roland Brock, William Leenders
Overexpression of (mutated) receptor tyrosine kinases is a characteristic of many aggressive tumors and induction of receptor uptake has long been recognized as a therapeutic modality. A conjugate of a synthetically produced cell penetrating peptide, corresponding to amino acids 38-59 of human lactoferrin, and the recombinant llama single-domain antibody (VHH) 7D12 that binds the human epidermal growth factor receptor (EGFR), was generated via sortase A-mediated transpeptidation. The conjugate blocks EGF-mediated EGFR activation with higher efficacy than both modalities alone, a phenomenon that is caused by both effective receptor blockade and internalization...
October 10, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/28993773/targeting-malignant-brain-tumors-with-antibodies
#15
REVIEW
Rok Razpotnik, Neža Novak, Vladka Čurin Šerbec, Uros Rajcevic
Antibodies have been shown to be a potent therapeutic tool. However, their use for targeting brain diseases, including neurodegenerative diseases and brain cancers, has been limited, particularly because the blood-brain barrier (BBB) makes brain tissue hard to access by conventional antibody-targeting strategies. In this review, we summarize new antibody therapeutic approaches to target brain tumors, especially malignant gliomas, as well as their potential drawbacks. Many different brain delivery platforms for antibodies have been studied such as liposomes, nanoparticle-based systems, cell-penetrating peptides (CPPs), and cell-based approaches...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28993197/increased-cellular-uptake-of-peptide-modified-pegylated-gold-nanoparticles
#16
Bo He, Yuan Zhang, Qiang Zhang, Bing He, Wenbing Dai, Xueqing Wang, Dan Yang, Mengmeng Qin, Hua Zhang, Changcheng Yin
Gold nanoparticles are promising drug delivery vehicles for nucleic acids, small molecules, and proteins, allowing various modifications on the particle surface. However, the instability and low bioavailability of gold nanoparticles compromise their clinical application. Here, we functionalized gold nanoparticles with CPP fragments (CALNNPFVYLI, CALRRRRRRRR) through sulfhydryl PEG to increase their stability and bioavailability. The resulting gold nanoparticles were characterized with transmission electron microscopy (TEM), dynamic light scattering (DLS), UV-visible spectrometry and X-ray photoelectron spectroscopy (XPS), and the stability in biological solutions was evaluated...
October 6, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28991060/hemodynamic-instability-and-cardiovascular-events-after-traumatic-brain-injury-predict-outcome-after-artifact-removal-with-deep-belief-network-analysis
#17
Hakseung Kim, Seung-Bo Lee, Yunsik Son, Marek Czosnyka, Dong-Joo Kim
BACKGROUND: Hemodynamic instability and cardiovascular events heavily affect the prognosis of traumatic brain injury. Physiological signals are monitored to detect these events. However, the signals are often riddled with faulty readings, which jeopardize the reliability of the clinical parameters obtained from the signals. A machine-learning model for the elimination of artifactual events shows promising results for improving signal quality. However, the actual impact of the improvements on the performance of the clinical parameters after the elimination of the artifacts is not well studied...
October 5, 2017: Journal of Neurosurgical Anesthesiology
https://www.readbyqxmd.com/read/28988334/a-systematic-review-of-cerebral-microdialysis-and-outcomes-in-tbi-relationships-to-patient-functional-outcome-neurophysiologic-measures-and-tissue-outcome
#18
REVIEW
Frederick A Zeiler, Eric Peter Thelin, Adel Helmy, Marek Czosnyka, Peter J A Hutchinson, David K Menon
OBJECTIVE: To perform a systematic review on commonly measured cerebral microdialysis (CMD) analytes and their association to: (A) patient functional outcome, (B) neurophysiologic measures, and (C) tissue outcome; after moderate/severe TBI. The aim was to provide a foundation for next-generation CMD studies and build on existing pragmatic expert guidelines for CMD. METHODS: We searched MEDLINE, BIOSIS, EMBASE, Global Health, Scopus, Cochrane Library (inception to October 2016)...
October 7, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28988223/makorin-ring-finger-3-gene-analysis-in-koreans-with-familial-precocious-puberty
#19
Hwal Rim Jeong, Hae Sang Lee, Jin Soon Hwang
BACKGROUND: Precocious puberty is known as an idiopathic, sporadic disease. Recently, specific mutations have been shown to cause familial central precocious puberty (CPP). The makorin ring finger 3 (MKRN3) gene plays a key role in puberty; loss-of-function mutations in the gene trigger familial CPP. To date, most described patients have been Western; few Asians with CPP have been documented. OBJECTIVE: To identify MKRN3 gene mutations or polymorphisms in Korean patients with familial CPP...
October 9, 2017: Journal of Pediatric Endocrinology & Metabolism: JPEM
https://www.readbyqxmd.com/read/28987881/high-density-lipoprotein-mutant-eye-drops-for-the-treatment-of-posterior-eye-diseases
#20
Kenji Suda, Tatsuya Murakami, Norimoto Gotoh, Ryosuke Fukuda, Yasuhiko Hashida, Mitsuru Hashida, Akitaka Tsujikawa, Nagahisa Yoshimura
Age-related macular degeneration (AMD), in which choroidal neovascularization (CNV) affects the center of the retina (macula), leads to the irreversible visual loss. The intravitreal injection of anti-angiogenesis antibodies improved the prognosis of AMD, but relatively less invasive therapies should be explored. In the present study, we show that a high-density lipoprotein (HDL) mutant is a therapeutically active drug carrier capable of treating a posterior eye disease in mice via instillation. Various HDL mutants were prepared with apoA-I proteins fused with different cell-penetrating peptides (CPPs) and phospholipids with different alkyl chain lengths; their sizes were further controlled in the range of 10-25nm...
October 5, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
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