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Tat peptide

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https://www.readbyqxmd.com/read/28442909/tat-functionalized-liposomes-for-the-treatment-of-meningitis-an-in-vitro-study
#1
Caterina Bartomeu Garcia, Di Shi, Thomas J Webster
Bacterial meningitis has become a global concern, because of the emergence of antibiotic-resistant bacteria. It has been demonstrated that liposomes can enter bacteria, thus providing a possible treatment for numerous infections, including meningitis. Fusogenic liposomes are pH-sensitive with a high capacity to fuse with the bacteria membrane and promote intracellular drug release. Moreover, this ability can be improved by using cell-penetrating peptides (such as Tat47-57, which is a peptide derived from the Tat protein of HIV)...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28437627/tumor-acidity-activatable-tat-targeted-nanomedicine-for-enlarged-fluorescence-magnetic-resonance-imaging-guided-photodynamic-therapy
#2
Meng Gao, Feng Fan, Dongdong Li, Yue Yu, Kuirong Mao, Tianmeng Sun, Haisheng Qian, Wei Tao, Xianzhu Yang
Nanoparticles simultaneously integrated the photosensitizers and diagnostic agents represent an emerging approach for imaging-guided photodynamic therapy (PDT). However, the diagnostic sensitivity and therapeutic efficacy of nanoparticles as well as the heterogeneity of tumors pose tremendous challenges for clinical imaging-guided PDT treatment. Herein, a polymeric nanoparticle with tumor acidity (pHe)-activatable TAT targeting ligand that encapsulates the photosensitizer chlorin e6 (Ce6) and chelates contrast agent Gd(3+) is successfully developed for fluorescence/magnetic resonance (MR) dual-model imaging-guided precision PDT...
April 18, 2017: Biomaterials
https://www.readbyqxmd.com/read/28435837/staphylococcus-aureus-type-i-signal-peptidase-essential-or-not-essential-that-s-the-question
#3
COMMENT
Wouter L Hazenbos, Elizabeth Skippington, Man-Wah Tan
Secretion of proteins into the extracellular environment is crucial for the normal physiology and virulence of pathogenic bacteria. Type I signal peptidase (SPase I) mediates the final step of bacterial secretion, by cleaving proteins at their signal peptide once they are translocated by the Sec or twin-arginine (Tat) translocon. SPase I has long been thought to be essential for viability in multiple bacterial pathogens. Challenging this view, we and others have recently created Staphylococcus aureus bacteria lacking the SPase I SpsB that are viable and able to grow in vitro when over-expressing a native gene cassette encoding for a putative ABC transporter...
March 17, 2017: Microbial Cell
https://www.readbyqxmd.com/read/28430962/ulk1-prevents-cardiac-dysfunction-in-obesity-through-autophagy-meditated-regulation-of-lipid-metabolism
#4
Minae An, Dong-Ryeol Ryu, Jang Won Park, Ji Ha Choi, Eun-Mi Park, Kyung Eun Lee, Minna Woo, Minsuk Kim
Aims: Autophagy is essential to maintain tissue homeostasis, particularly in long-lived cells such as cardiomyocytes. Whereas many studies support the importance of autophagy in the mechanisms underlying obesity-related cardiac dysfunction, the role of autophagy in cardiac lipid metabolism remains unclear. In the heart, lipotoxicity is exacerbated by cardiac lipoprotein lipase (LPL), which mediates accumulation of fatty acids to the heart through intravascular triglyceride (TG) hydrolysis...
April 17, 2017: Cardiovascular Research
https://www.readbyqxmd.com/read/28421460/flow-arrest-intra-arterial-delivery-of-small-tat-decorated-and-neutral-micelles-to-gliomas
#5
Juliane Nguyen, Shaolie S Hossain, Johann R N Cooke, Jason A Ellis, Michael B Deci, Charles W Emala, Jeffrey N Bruce, Irving J Bigio, Robert M Straubinger, Shailendra Joshi
The cell-penetrating trans-activator of transcription (TAT) is a cationic peptide derived from human immunodeficiency virus-1. It has been used to facilitate macromolecule delivery to various cell types. This cationic peptide is capable of crossing the blood-brain barrier and therefore might be useful for enhancing the delivery of drugs that target brain tumors. Here we test the efficiency with which relatively small (20 nm) micelles can be delivered by an intra-arterial route specifically to gliomas. Utilizing the well-established method of flow-arrest intra-arterial injection we compared the degree of brain tumor deposition of cationic TAT-decorated micelles versus neutral micelles...
April 18, 2017: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/28385674/human-derived-fusogenic-peptides-for-the-intracellular-delivery-of-proteins
#6
Kei Sudo, Keisuke Niikura, Kouta Iwaki, Shunshi Kohyama, Kei Fujiwara, Nobuhide Doi
The cytosolic delivery of therapeutic proteins (e.g., antibodies or enzymes) by cell-penetrating peptides (CPPs), such as a human immunodeficiency virus-derived TAT peptide, is facilitated by fusogenic peptides (FPs). For instance, we recently demonstrated that an FP, B18, which is derived from a sea urchin gamete fusion protein, promotes endosomal escape of an enhanced green fluorescent protein (eGFP)-TAT fusion protein directly conjugated to it. However, the potential clinical use of FPs raises concerns because all conventional FPs are non-human-derived...
April 4, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28375632/tumor-acidity-nir-controlled-interaction-of-transformable-nanoparticle-with-biological-systems-for-cancer-therapy
#7
Dong-Dong Li, Yinchu Ma, Jinzhi Du, Wei Tao, Xiao-Jiao Du, Xian-Zhu Yang, Jun Wang
Precisely controlling the interaction of nanoparticles with biological systems (nano-bio interactions) from the injection site to biological targets shows great potential for biomedical applications. Inspired by the ability of nanoparticles to alter their physicochemical properties according to different stimuli, we explored the tumor acidity and near-infrared (NIR) light activated transformable nanoparticle (DA)TAT-NPIR&DOX. This nanoparticle consists of a tumor acidity-activated TAT (the TAT lysine residues' amines was modified with 2,3-dimethylmaleic anhydride (DA)), a flexible chain polyphosphoester core co-encapsulated a NIR dye IR-780 and DOX (doxorubicin)...
April 4, 2017: Nano Letters
https://www.readbyqxmd.com/read/28372987/disrupting-sensitization-of-trpv4
#8
Konrad Mack, Michael J M Fischer
TRPV4 ion channels have a broad expression profile and were shown to contribute to enhanced pain sensation in inflammation. Directly blocking TRPV4 might run the risk of interfering with normal physiology, and has prompted to explore the interaction with the scaffolding protein AKAP79, an approach successfully used for TRPV1 channels. HEK293t cells express AKAP79, additional transfection did not sensitize human TRPV4. Application of trypsin facilitated responses to TRPV4 agonist GSK1016790A. Using a specific protease-activated receptor 2 agonist, involvement of an A-kinase anchoring protein in TRPV4 activation was demonstrated by inhibition with AKAP inhibitor peptide Ht31...
April 1, 2017: Neuroscience
https://www.readbyqxmd.com/read/28369936/the-role-played-by-oxidative-stress-in-evoking-the-exercise-pressor-reflex-in-health-and-simulated-peripheral-artery-disease
#9
Jonathan E Harms, J Matthew Kuczmarski, Joyce Kim, Gail D Thomas, Marc P Kaufman
Contraction of muscle evokes the exercise pressor reflex (EPR), which is expressed partly by increases in heart rate and arterial pressure. Patients with peripheral artery disease (PAD) show an exaggerated EPR, sometimes report pain when walking and are at risk for cardiac arrthymias. Previous research suggested that reactive oxygen species (ROS) mediate the exaggerated EPR associated with PAD. To examine the effects of ROS on the EPR, we infused a superoxide scavenger, tiron, into the superficial epigastric artery of decerebrated rats...
March 28, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28368124/development-of-surface-variable-polymeric-nanoparticles-for-drug-delivery-to-tumors
#10
Ning Han, Liang Pang, Jun Xu, Hyesun Hyun, Jinho Park, Yoon Yeo
To develop nanoparticle drug carriers that interact with cells specifically in the mildly acidic tumor microenvironment, we produced polymeric nanoparticles modified with amidated TAT peptide via a simple surface modification method. Two types of core poly(lactic-co-glycolic acid) nanoparticles (NL and NP) were prepared with a phospholipid shell as an optional feature and covered with polydopamine that enabled the conjugation of TAT peptide on the surface. Subsequent treatment with acid anhydrides such as cis-aconitic anhydride (CA) and succinic anhydride (SA) converted amines of lysine residues in TAT peptide to β-carboxylic amides, introducing carboxylic groups that undergo pH-dependent protonation and deprotonation...
April 11, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28334537/multivalency-effect-of-tat-peptide-functionalized-nanoparticle-in-cellular-endocytosis-and-subcellular-trafficking
#11
Chumki Dalal, Nikhil R Jana
Although trans-activating transcription (TAT) peptide-functionalized nanoparticle/polymer/liposome is widely used for cellular transfection applications, the multivalency (number of attached peptide per particle) effect on cell uptake mechanism and subcellular targeting performance is largely unexplored. Here we show that multivalency of nanoparticle controls the cellular interaction, cellular entry/exit mechanism, and subcellular targeting performance. We have synthesized TAT-peptide functionalized quantum dot (QD) of 30-35 nm hydrodynamic diameter with varied multivalency from 10 to 75 (e...
March 31, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28323576/tat-rasgap317-326-enhances-radiosensitivity-of-human-carcinoma-cell-lines-in-vitro-and-in-vivo-through-promotion-of-delayed-mitotic-cell-death
#12
Pelagia Tsoutsou, Alessandro Annibaldi, David Viertl, Jonathan Ollivier, Franz Buchegger, Marie-Catherine Vozenin, Jean Bourhis, Christian Widmann, Oscar Matzinger
The synthetic peptide TAT-RasGAP317-326 has been shown to potentiate the efficacy of anti-cancer drugs. In this study, we explored the action of TAT-RasGAP317-326 when combined with radiation by investigating its radiosensitizing activity in vitro and in vivo. To investigate the modulation of intrinsic radiosensitivity induced by TAT-RasGAP317-326, clonogenic assays were performed using four human cancer cell lines, HCT116 p53(+/+) (ATCC: CCL-247), HCT116 p53(-/-), PANC-1 (ATCC: CRL-1469) and HeLa (ATCC: CCL-2), as well as one nontumor cell line, HaCaT (CLS: 300493)...
March 21, 2017: Radiation Research
https://www.readbyqxmd.com/read/28322550/multiplex-substrate-profiling-by-mass-spectrometry-for-kinases-as-a-method-for-revealing-quantitative-substrate-motifs
#13
Nicole O Meyer, Anthony J O'Donoghue, Ursula Schulze-Gahmen, Matthew Ravalin, Steven M Moss, Michael B Winter, Giselle M Knudsen, Charles S Craik
The more than 500 protein kinases comprising the human kinome catalyze hundreds of thousands of phosphorylation events to regulate a diversity of cellular functions; however, the extended substrate specificity is still unknown for many of these kinases. We report here a method for quantitatively describing kinase substrate specificity using an unbiased peptide library-based approach with direct measurement of phosphorylation by tandem liquid chromatography-tandem mass spectrometry (LC-MS/MS) peptide sequencing (multiplex substrate profiling by mass spectrometry, MSP-MS)...
April 18, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28314993/comparative-analysis-of-internalisation-haemolytic-cytotoxic-and-antibacterial-effect-of-membrane-active-cationic-peptides-aspects-of-experimental-setup
#14
Kata Horváti, Bernadett Bacsa, Tamás Mlinkó, Nóra Szabó, Ferenc Hudecz, Ferenc Zsila, Szilvia Bősze
Cationic peptides proved fundamental importance as pharmaceutical agents and/or drug carrier moieties functioning in cellular processes. The comparison of the in vitro activity of these peptides is an experimental challenge and a combination of different methods, such as cytotoxicity, internalisation rate, haemolytic and antibacterial effect, is necessary. At the same time, several issues need to be addressed as the assay conditions have a great influence on the measured biological effects and the experimental setup needs to be optimised...
March 17, 2017: Amino Acids
https://www.readbyqxmd.com/read/28286529/a-synthetic-strategy-for-conjugation-of-paromomycin-to-cell-penetrating-tat-48-60-for-delivery-and-visualization-into-leishmania-parasites
#15
Sira Defaus, Maria Gallo, María A Abengózar, Luis Rivas, David Andreu
A successful approach to deliver paromomycin, a poorly absorbed aminoglycoside antibiotic, to parasite cells is reported, based on selective protection of amino and hydroxyl groups followed by conjugation to a fluorolabeled, PEG-functionalized cell-penetrating Tat(48-60) peptide. The resulting construct is efficiently internalized into Leishmania cells, evidencing the fitness of cell-penetrating peptides as vectors for efficiently transporting low-bioavailability drugs into cells.
2017: International Journal of Peptides
https://www.readbyqxmd.com/read/28285195/engineering-intravaginal-vaccines-to-overcome-mucosal-and-epithelial-barriers
#16
Zhonghua Ji, Zhaolu Xie, Zhirong Zhang, Tao Gong, Xun Sun
The mucosal surface of the vagina is a primary human immunodeficiency virus (HIV) entry portal, making it an attractive site for HIV vaccination. However, HIV vaccines based on recombinant adenovirus (rAd) do not efficiently cross the mucus layers or underlying epithelium of the vagina. Here we designed nanocomplexes of rAd particles coated with (1) the polyethylene glycol derivative APS to provide a hydrophilic surface that would prevent entrapment in the hydrophobic mucus, and (2) the cell-penetrating peptide TAT to improve transduction efficiency...
June 2017: Biomaterials
https://www.readbyqxmd.com/read/28282092/nir-emitting-and-photo-thermal-active-nanogold-as-mitochondria-specific-probes
#17
Sabyasachi Chakrabortty, Miguel Sison, Yuzhou Wu, Anita Ladenburger, Goutam Pramanik, Johannes Biskupek, Jerome Extermann, Ute Kaiser, Theo Lasser, Tanja Weil
We report a bioinspired multifunctional albumin derived polypeptide coating comprising grafted poly(ethylene oxide) chains, multiple copies of the HIV TAT derived peptide enabling cellular uptake as well as mitochondria targeting triphenyl-phosphonium (TPP) groups. Exploring these polypeptide copolymers for passivating gold nanoparticles (Au NPs) yielded (i) NIR-emitting markers in confocal microscopy and (ii) photo-thermal active probes in optical coherence microscopy. We demonstrate the great potential of such multifunctional protein-derived biopolymer coatings for efficiently directing Au NP into cells and to subcellular targets to ultimately probe important cellular processes such as mitochondria dynamics and vitality inside living cells...
March 10, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28279738/modifying-plasmid-loaded-hsa-nanoparticles-with-cell-penetrating-peptides-cellular-uptake-and-enhanced-gene-delivery
#18
J Mesken, A Iltzsche, D Mulac, K Langer
Gene therapy bears great potential for the cure of a multitude of human diseases. Research efforts focussed on the use of viral delivery vectors in the past decades, neglecting non-viral gene therapies of physical or chemical origin due to low transfection efficiency. However, side effects such as activation of oncogenes and inflammatory reactions upon immune cell activation are major obstacles impeding the clinical applicability of viral gene therapy vectors. The aim of this study was the development of a non-viral gene delivery system based on plasmid-loaded human serum albumin nanoparticles, which are biocompatible, biodegradable, and non-toxic in relevant concentrations...
March 6, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28263836/optical-barcoding-of-plga-for-multispectral-analysis-of-nanoparticle-fate-in-vivo
#19
David X Medina, Kyle T Householder, Ricki Ceton, Tina Kovalik, John M Heffernan, Rohini V Shankar, Robert P Bowser, Robert J Wechsler-Reya, Rachael W Sirianni
Understanding of the mechanisms by which systemically administered nanoparticles achieve delivery across biological barriers remains incomplete, due in part to the challenge of tracking nanoparticle fate in the body. Here, we develop a new approach for "barcoding" nanoparticles (NPs) composed of poly(lactic-co-glycolic acid) (PLGA) with bright, spectrally defined quantum dots (QDs) to enable direct, fluorescent detection of NP fate with subcellular resolution. We show that QD labeling does not affect major biophysical properties of NPs or their interaction with cells and tissues...
March 2, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28262014/high-efficiency-secretion-of-%C3%AE-mannanase-in-bacillus-subtilis-through-protein-synthesis-and-secretion-optimization
#20
Yafeng Song, Gang Fu, Huina Dong, Jianjun Li, Yuguang Du, Dawei Zhang
The manno endo-1,4-mannosidase (β-mannanase, EC. 3.2.1.78) catalyzes the random hydrolysis of internal (1 → 4)-β-mannosidic linkages in the mannan polymers. A codon optimized β-mannanase gene from Bacillus licheniformis DSM13 was expressed in Bacillus subtilis. When four Sec-dependent and two Tat-dependent signal peptide sequences cloned from B. subtilis were placed upstream of the target gene, the highest activity of β-mannanase was observed using SPlipA as a signal peptide. Then a 1.25-fold activity of β-mannanase was obtained when another copy of groESL operon was inserted into the genome of host strain...
March 29, 2017: Journal of Agricultural and Food Chemistry
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