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Microglia nanoparticles

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https://www.readbyqxmd.com/read/29702566/preferential-and-increased-uptake-of-hydroxyl-terminated-pamam-dendrimers-by-activated-microglia-in-rabbit-brain-mixed-glial-culture
#1
Yossef Alnasser, Siva P Kambhampati, Elizabeth Nance, Labchan Rajbhandari, Shiva Shrestha, Arun Venkatesan, Rangaramanujam M Kannan, Sujatha Kannan
Polyamidoamine (PAMAM) dendrimers are multifunctional nanoparticles with tunable physicochemical features, making them promising candidates for targeted drug delivery in the central nervous system (CNS). Systemically administered dendrimers have been shown to localize in activated glial cells, which mediate neuroinflammation in the CNS. These dendrimers delivered drugs specifically to activated microglia, producing significant neurological improvements in multiple brain injury models, including in a neonatal rabbit model of cerebral palsy...
April 27, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29701613/hydrazone-linked-doxorubicin-pla-prodrug-nanoparticles-with-high-drug-loading
#2
Simone Gatti, Azzurra Agostini, Umberto Capasso Palmiero, Claudio Colombo, Marco Peviani, Alessandra Biffi, Davide Moscatelli
An optimal drug delivery system should be characterized by biocompatibility, biodegradability, high drug loading and favorable drug release profile. To achieve this goal a hydrazone linked doxorubicin-poly(lactic acid) prodrug (PLA-DOX) was synthesized by the functionalization of a short polymer chain produced by ring opening polymerization. The hydrophobic prodrug generated in this way was nanoprecipitated using a block copolymer to form polymeric nanoparticles (NPs) with a quantitative loading efficiency and a high and tunable drug loading...
April 27, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29611482/potential-use-of-nanomedicine-for-the-anti-inflammatory-treatment-of-neurodegenerative-diseases
#3
Maria Dolores Cayero-Otero, Ana M Espinosa-Oliva, Antonio J Herrera, Irene Garcia-Dominguez, Mercedes Fernandez-Arevalo, Lucia Martin-Banderas, Rocio M de Pablos
Neurodegenerative diseases, like Alzheimer´s and Parkinson´s disease, are a group of disorders that have in common their increasingly high prevalence along with the shortage of effective treatments. In addition, the scientific community faces the challenge of getting the drugs used in these treatments to cross the blood-brain barrier (BBB) and reach the brain in sufficient concentration to be able to exert its effect. Hence, researchers across multiple disciplines are working together in order to improve the ability of therapeutics to penetrate the BBB...
April 2, 2018: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/29575461/bespoke-ceria-nanoparticles-show-a-neuroprotective-effect-by-modulating-phenotypic-polarization-of-the-microglia
#4
Feng Zeng, Yingwei Wu, Xinwei Li, Xiaojiao Ge, Qinghua Guo, Xiaobing Lou, Zhonglian Cao, Bingwen Hu, Nicholas J Long, Ying Mao, Cong Li
The neuroprotective effect of ceria nanoparticles to brain disorders has been explained by their antioxidant effect. However, the in-depth mechanism remains unknown. As resident immune cells in the brain, microglia exert a variety of functional reprogramming termed as polarization to respond to stress stimuli. Herein, a bespoke ceria nanoparticle was developed and scavenged multiple reactive oxygen species with extremely high efficiency. This nanoparticle drove microglial polarization from a pro-inflammatory phenotype to an anti-inflammatory phenotype under pathological conditions...
March 25, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29540215/glutaminase-1-regulates-the-release-of-extracellular-vesicles-during-neuroinflammation-through-key-metabolic-intermediate-alpha-ketoglutarate
#5
Beiqing Wu, Jianhui Liu, Runze Zhao, Yuju Li, Justin Peer, Alexander L Braun, Lixia Zhao, Yi Wang, Zenghan Tong, Yunlong Huang, Jialin C Zheng
BACKGROUND: Extracellular vesicles (EVs) are important in the intercellular communication of the central nervous system, and their release is increased during neuroinflammation. Our previous data demonstrated an increased release of EVs during HIV-1 infection and immune activation in glial cells. However, the molecular mechanism by which infection and inflammation increase EV release remains unknown. In the current study, we investigated the role of glutaminase 1 (GLS1)-mediated glutaminolysis and the production of a key metabolic intermediate α-ketoglutarate on EV release...
March 14, 2018: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/29530814/curcumin-loaded-nanoparticles-ameliorate-glial-activation-and-improve-myelin-repair-in-lyolecithin-induced-focal-demyelination-model-of-rat-corpus-callosum
#6
Reza Naeimi, Fatemeh Safarpour, Mona Hashemian, Hamed Tashakorian, Seyed Raheleh Ahmadian, Manouchehr Ashrafpour, Maryam Ghasemi-Kasman
Curcumin has been introduced as effective anti-inflammatory agent in treatment of several inflammatory disorders. Despite the wide range pharmacological activities, clinical application of curcumin is restricted mainly due to the low water solubility of this substance. More recently, we could remarkably improve the aqueous solubility of curcumin by its encapsulation in chitosan-alginate-sodium tripolyphosphate nanoparticles (CS-ALG-STPP NPs). In this study, the anti-inflammatory and myelin protective effects of curcumin-loaded NPs were evaluated in lysolecithin (LPC)-induced focal demyelination model...
May 1, 2018: Neuroscience Letters
https://www.readbyqxmd.com/read/29522448/microglial-immune-response-to-low-concentrations-of-combustion-generated-nanoparticles-an-in-vitro-model-of-brain-health
#7
Cayla M Duffy, Jacob Swanson, William Northrop, Joshua P Nixon, Tammy A Butterick
The brain is the central regulator for integration and control of responses to environmental cues. Previous studies suggest that air pollution may directly impact brain health by triggering the onset of chronic neuroinflammation. We hypothesize that nanoparticle components of combustion-generated air pollution may underlie these effects. To test this association, a microglial in vitro biological sensor model was used for testing neuroinflammatory response caused by low-dose nanoparticle exposure. The model was first validated using 20 nm silver nanoparticles (AgNP)...
March 9, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29518539/intravenous-administration-of-retinoic-acid-loaded-polymeric-nanoparticles-prevents-ischemic-injury-in-the-immature-brain
#8
Marta Machado-Pereira, Tiago Santos, Lino Ferreira, Liliana Bernardino, Raquel Ferreira
Perinatal stroke is often difficult to diagnose and an established treatment has not yet been validated, except for symptomatic measures. Herein, we propose to test the neuroprotective potential of the intravenous injection of retinoic acid-loaded nanoparticles (RA-NP) upon ischemic injury to the immature brain. The role of RA-NP on endothelial cells and organotypic slice cultures exposed to oxygen and glucose deprivation was assessed by evaluating markers pertaining to survival, proliferation, oxidative stress (NO, ROS), neuronal damage (enolase), vascular oxidation (p47phox) and microglia activation (CD68)...
April 23, 2018: Neuroscience Letters
https://www.readbyqxmd.com/read/29433522/ros-responsive-resveratrol-delivery-from-ldlr-peptide-conjugated-pla-coated-mesoporous-silica-nanoparticles-across-the-blood-brain-barrier
#9
Yang Shen, Bin Cao, Noah R Snyder, Kevin M Woeppel, James R Eles, Xinyan Tracy Cui
BACKGROUND: Oxidative stress acts as a trigger in the course of neurodegenerative diseases and neural injuries. An antioxidant-based therapy can be effective to ameliorate the deleterious effects of oxidative stress. Resveratrol (RSV) has been shown to be effective at removing excess reactive oxygen species (ROS) or reactive nitrogen species generation in the central nervous system (CNS), but the delivery of RSV into the brain through systemic administration is inefficient. Here, we have developed a RSV delivery vehicle based on polylactic acid (PLA)-coated mesoporous silica nanoparticles (MSNPs), conjugated with a ligand peptide of low-density lipoprotein receptor (LDLR) to enhance their transcytosis across the blood-brain barrier (BBB)...
February 13, 2018: Journal of Nanobiotechnology
https://www.readbyqxmd.com/read/29421566/protecting-neurons-from-cerebral-ischemia-reperfusion-injury-via-nanoparticle-mediated-delivery-of-an-sirna-to-inhibit-microglial-neurotoxicity
#10
Ye Wang, Shi-Yong Li, Song Shen, Jun Wang
Complement component C3 (C3) plays a central role in microglial neurotoxicity following cerebral ischemia/reperfusion (I/R) injury. In this study, we focused on the role of nanoparticles loaded with C3 siRNA (NPsiC3 ) in inhibiting microglial neurotoxicity after brain (I/R) injury. NPsiC3 inhibited the hypoxia/re-oxygenation-induced increase in C3 expression in microglia in vitro. Importantly, treatment with NPsiC3 decreased C3b deposition on neurons and reduced microglia-mediated neuronal damage under hypoxia/re-oxygen conditions...
April 2018: Biomaterials
https://www.readbyqxmd.com/read/29327816/brain-cortex-microglia-derived-exosomes-nanoparticles-for-glioma-therapy
#11
Adriana-Natalia Murgoci, Dasa Cizkova, Petra Majerova, Eva Petrovova, Lubomir Medvecky, Isabelle Fournier, Michel Salzet
The function and integrity of the nervous system require interactive exchanges among neurons and glial cells. Exosomes and other extracellular vesicles (EVs) are emerging as a key mediator of intercellular communication, capable of transferring nucleic acids, proteins and lipids influencing numerous functional and pathological aspects of both donor and recipient cells. The immune response mediated by microglia-derived exosomes is most prominently involved in the spread of neuroinflammation, neurodegenerative disorders, and brain cancer...
January 12, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/29210401/hybrid-magneto-plasmonic-liposomes-for-multimodal-image-guided-and-brain-targeted-hiv-treatment
#12
Asahi Tomitaka, Hamed Arami, Zaohua Huang, Andrea Raymond, Elizette Rodriguez, Yong Cai, Marcelo Febo, Yasushi Takemura, Madhavan Nair
Image-guided drug delivery is an emerging strategy in the field of nanomedicine. The addition of image guidance to a traditional drug delivery system is expected to achieve highly efficient treatment by tracking the drug carriers in the body and monitoring their effective accumulation in the targeted tissues. In this study, we developed multifunctional magneto-plasmonic liposomes (MPLs), a hybrid system combining liposomes and magneto-plasmonic nanoparticles for a triple-modality image-guided drug delivery...
December 21, 2017: Nanoscale
https://www.readbyqxmd.com/read/29163489/ameliorating-amyloid-%C3%AE-fibrils-triggered-inflammation-via-curcumin-loaded-polymeric-nanoconstructs
#13
Andrea Ameruoso, Roberto Palomba, Anna Lisa Palange, Antonio Cervadoro, Aeju Lee, Daniele Di Mascolo, Paolo Decuzzi
Inflammation is a common hallmark in several diseases, including atherosclerosis, cancer, obesity, and neurodegeneration. In Alzheimer's disease (AD), growing evidence directly correlates neuronal damage with inflammation of myeloid brain cells, such as microglia. Here, polymeric nanoparticles were engineered and characterized for the delivery of anti-inflammatory molecules to macrophages stimulated via direct incubation with amyloid-β fibers. 200 nm spherical polymeric nanoconstructs (SPNs) and 1,000 nm discoidal polymeric nanoconstructs (DPNs) were synthesized using poly(lactic- co -glycolic acid) (PLGA), polyethylene glycol (PEG), and lipid chains as building blocks...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29138531/anti-inflammatory-strategy-for-m2-microglial-polarization-using-retinoic-acid-loaded-nanoparticles
#14
Marta Machado-Pereira, Tiago Santos, Lino Ferreira, Liliana Bernardino, Raquel Ferreira
Inflammatory mechanisms triggered by microglial cells are involved in the pathophysiology of several brain disorders, hindering repair. Herein, we propose the use of retinoic acid-loaded polymeric nanoparticles (RA-NP) as a means to modulate microglia response towards an anti-inflammatory and neuroprotective phenotype (M2). RA-NP were first confirmed to be internalized by N9 microglial cells; nanoparticles did not affect cell survival at concentrations below 100  μ g/mL. Then, immunocytochemical studies were performed to assess the expression of pro- and anti-inflammatory mediators...
2017: Mediators of Inflammation
https://www.readbyqxmd.com/read/29034063/targeting-orthotopic-gliomas-with-renal-clearable-luminescent-gold-nanoparticles
#15
Chuanqi Peng, Xiaofei Gao, Jing Xu, Bujie Du, Xuhui Ning, Shaoheng Tang, Robert M Bachoo, Mengxiao Yu, Woo-Ping Ge, Jie Zheng
A major clinical translational challenge in nanomedicine is the potential of toxicity associated with the uptake and long-term retention of non-degradable nanoparticles (NPs) in major organs. The development of inorganic NPs that undergo renal clearance could potentially resolve this significant biosafety concern. However, it remains unclear whether inorganic NPs that can be excreted by the kidneys remain capable of targeting tumors with poor permeability. Glioblastoma multiforme, the most malignant orthotopic brain tumor, presents a unique challenge for NP delivery because of the blood-brain barrier and robust blood-tumor barrier of reactive microglia and macroglia in the tumor microenvironment...
April 2017: Nano Research
https://www.readbyqxmd.com/read/28903312/gnp-gapdh1-22-nanovaccines-prevent-neonatal-listeriosis-by-blocking-microglial-apoptosis-and-bacterial-dissemination
#16
Ricardo Calderon-Gonzalez, Elisabet Frande-Cabanes, Hector Teran-Navarro, José María Marimon, Javier Freire, David Salcines-Cuevas, M Carmen Fariñas, Claudia Onzalez-Rico, Marco Marradi, Isabel Garcia, Mirian Alkorta-Gurrutxaga, Aida San Nicolas-Gomez, Ana Castañeda-Sampedro, Sonsoles Yañez-Diaz, Soledad Penades, Carmen Punzon, Javier Gomez-Roman, Fernando Rivera, Manuel Fresno, Carmen Alvarez-Dominguez
Clinical cases of neonatal listeriosis are associated with brain disease and fetal loss due to complications in early or late pregnancy, which suggests that microglial function is altered. This is believed to be the first study to link microglial apoptosis with neonatal listeriosis and listeriosis-associated brain disease, and to propose a new nanovaccine formulation that reverses all effects of listeriosis and confers Listeria monocytogenes (LM)-specific immunity. We examined clinical cases of neonatal listeriosis in 2013-2015 and defined two useful prognostic immune biomarkers to design listeriosis vaccines: high anti-GAPDH1-22 titres and tumor necrosis factor (TNF)/interleukin (IL)-6 ratios...
August 15, 2017: Oncotarget
https://www.readbyqxmd.com/read/28866799/intranasal-administration-of-tat-conjugated-lipid-nanocarriers-loading-gdnf-for-parkinson-s-disease
#17
Sara Hernando, Enara Herran, Joana Figueiro-Silva, José Luis Pedraz, Manoli Igartua, Eva Carro, Rosa Maria Hernandez
Parkinson's disease (PD) is the second most common neurodegenerative disorder (ND), characterized by the loss of dopaminergic neurons, microglial activation, and neuroinflammation. Current available treatments in clinical practice cannot halt the progression of the disease. During the last few years, growth factors (GFs) have been raised as a promising therapeutic approach to address the underlying neurodegenerative process. Among others, glial cell-derived neurotrophic factor (GDNF) is a widely studied GF for PD...
January 2018: Molecular Neurobiology
https://www.readbyqxmd.com/read/28762184/nef-is-secreted-in-exosomes-from-nef-gfp-expressing-and-hiv-1-infected-human-astrocytes
#18
Pia Pužar Dominkuš, Jana Ferdin, Ana Plemenitaš, Boris Matija Peterlin, Metka Lenassi
HIV-1 infection of the central nervous system causes HIV-associated neurocognitive disorders, even in aviremic patients. Although astrocyte malfunction was associated to these disorders, their implication is overshadowed by contributions of microglia and macrophages. Astrocytes are infected with HIV-1 in vivo and express a relevant amount of viral protein Nef. Nef was shown to stimulate its own release in exosomes from diverse cell types, which in turn have damaging effects on neighboring cells. Using immunoblotting and electron microscopy, we showed that human astrocytes expressing Nef...
October 2017: Journal of Neurovirology
https://www.readbyqxmd.com/read/28753580/gnp-gapdh1-22-nanovaccines-prevent-neonatal-listeriosis-by-blocking-microglial-apoptosis-and-bacterial-dissemination
#19
Ricardo Calderon-Gonzalez, Elisabet Frande-Cabanes, Hector Teran-Navarro, José María Marimon, Javier Freire, David Salcines-Cuevas, M Carmen Fariñas, Claudia Gonzalez-Rico, Marco Marradi, Isabel Garcia, Mirian Alkorta-Gurrutxaga, Aida San Nicolas-Gomez, Ana Castañeda-San Pedro, Sonsoles Yañez-Diaz, Soledad Penades, Carmen Punzon, Javier Gomez-Roman, Fernando Rivera, Manuel Fresno, Carmen Alvarez-Dominguez
Clinical cases of neonatal listeriosis are associated with brain disease and fetal loss due to complications in early or late pregnancy, which suggests that microglial function is altered. This is believed to be the first study to link microglial apoptosis with neonatal listeriosis and listeriosis-associated brain disease, and to propose a new nanovaccine formulation that reverses all effects of listeriosis and confers Listeria monocytogenes (LM)-specific immunity. We examined clinical cases of neonatal listeriosis in 2013-2015 and defined two useful prognostic immune biomarkers to design listeriosis vaccines: high anti-GAPDH1-22 titres and tumor necrosis factor (TNF)/interleukin (IL)-6 ratios...
July 20, 2017: Oncotarget
https://www.readbyqxmd.com/read/28336376/effect-of-anesthetics-on-microglial-activation-and-nanoparticle-uptake-implications-for-drug-delivery-in-traumatic-brain-injury
#20
Gokul Kannan, Siva P Kambhampati, Sapna R Kudchadkar
Traumatic brain injury (TBI) is a serious public health problem, often with devastating consequences for patients and their families. Affordable and timely therapies can have a substantial impact on outcomes in severe TBI. Despite the common use of sedatives and anesthetics in the acute phase of TBI management, their effect on glial cells is not well understood. We investigated the effect of a commonly used sedative, pentobarbital, on glial cells and their uptake of nanoparticles. First, we studied how pentobarbital affects BV2 mouse microglial cells in culture...
March 21, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
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