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Interleukin-4 receptor-targeted delivery of Bcl-xL siRNA sensitizes tumors to chemotherapy and inhibits tumor growth.
In this study, we exploited IL-4R-targeted delivery of Bcl-xL siRNA to IL-4R-expressing tumor cells in order to sensitize them to chemotherapy. To target IL-4R, an IL-4R-binding peptide, IL4RPep-1, was attached to branched polyethyleneimine-superparamagnetic iron oxide nanoparticles (BPEI-SPION). These nanoparticles were then complexed with Bcl-xL-targeting siRNA. IL-4R-targeted BPEI-SPION/Bcl-xL siRNA more efficiently reduced Bcl-xL gene expression and enhanced cytotoxicity of doxorubicin in MDA-MB231 breast tumor cells compared to untargeted BPEI-SPION/Bcl-xL siRNA. The siRNA was released from the complexes after 15 h o...
Source: Biomaterials - July 15, 2017 Category: Materials Science Authors: Guruprasath P, Kim J, Gunassekaran GR, Chi L, Kim S, Park RW, Kim SH, Baek MC, Bae SM, Kim SY, Kim DK, Park IK, Kim WJ, Lee B Tags: Biomaterials Source Type: research

MRI-Visible Nanovehicle for Efficient siRNA Delivery
Methods Mol Biol. 2021;2282:195-208. doi: 10.1007/978-1-0716-1298-9_13.ABSTRACTVisualizing siRNA delivery through medical imaging methods has drawn much attentions in recent gene therapy studies. Among them, iron oxide-based magnetic resonance imaging (MRI) is regarded as one of the most promising imaging modalities for its high spatial resolution as well as deep penetration and real-time properties. In this chapter, a detailed protocol of an amphiphilic superparamagnetic iron oxide (SPIO) nanovehicle-based siRNA delivery is described, mainly focusing on SPIO/siRNA complexes formation and characterization, in vitro and in ...
Source: Mol Biol Cell - April 30, 2021 Category: Molecular Biology Authors: Rongrong Jin Wencheng Zhu Gan Lin Gang Liu Hua Ai Source Type: research

Superparamagnetic iron oxide nanoparticles target BxPC-3 cells and silence MUC4 for theranostics of pancreatic cancer
CONCLUSION: PEI-SPION-siRNA may be beneficial as a novel theranostic tool for PC.PMID:37236323 | DOI:10.1016/j.bbagen.2023.130383
Source: Biochimica et Biophysica Acta - May 26, 2023 Category: Biochemistry Authors: Yu Pu Helin Ke Changqiang Wu Shaodan Xu Yang Xiao Lina Han Guorong Lyv Shilin Li Source Type: research

Superparamagnetic iron oxide nanoparticles mediated 131I-hVEGF siRNA inhibits hepatocellular carcinoma tumor growth in nude mice
Conclusions: EMF-guided 131I-hVEGF siRNA/SilenceMag exhibited an antitumor effect. The synergic therapy of 131I-hVEGF siRNA/SilenceMag might be a promising future treatment option against HCC with the dual functional properties of tumor therapy and imaging.
Source: BMC Cancer - February 21, 2014 Category: Cancer & Oncology Authors: Jing ChenShu ZhuLiangqian TongJiansha LiFei ChenYunfeng HanMing ZhaoWei Xiong Source Type: research

Pmp22 mutant allele-specific siRNA alleviates demyelinating neuropathic phenotype in vivo.
In this study, we investigated whether regulation of a mutant allele by an allele-specific small interfering RNA (siRNA) can alleviate the demyelinating neuropathic phenotype of CMT. We designed 19 different allele-specific siRNAs for Trembler J (Tr-J) mice harboring a naturally occurring mutation (Leu16Pro) in Pmp22. Using a luciferase assay, we identified an siRNA that specifically and selectively reduced the expression level of the mutant allele and reversed the low viability of Schwann cells caused by mutant Pmp22 over-expression in vitro. The in vivo efficacy of the allele-specific siRNA was assessed by its intraperit...
Source: Neurobiology of Disease - January 16, 2017 Category: Neurology Authors: Lee JS, Chang EH, Koo OJ, Jwa DH, Mo WM, Kwak G, Moon HW, Park HT, Hong YB, Choi BO Tags: Neurobiol Dis Source Type: research

Stealth magnetic nanocarriers of siRNA as platform for breast cancer theranostics
Publication date: 5 November 2017 Source:International Journal of Pharmaceutics, Volume 532, Issue 2 Author(s): J. Bruniaux, S. Ben Djemaa, K. Hervé-Aubert, H. Marchais, I. Chourpa, S. David The endogenous mechanism of RNA interference is more and more used in research to obtain specific down-regulation of gene expression in diseases such as breast cancer. Currently, despite the new fields of study open up by RNA interference, the rapid degradation of siRNA by nucleases and their negative charges prevent them from crossing cell membranes. To overcome these limitations, superparamagnetic iron oxide nanoparticles (SPIONs) ...
Source: International Journal of Pharmaceutics - October 11, 2017 Category: Drugs & Pharmacology Source Type: research

Nanotherapy Silencing the Interleukin-8 Gene Produces Regression of Prostate Cancer by Inhibition of Angiogenesis.
This study examines the role of IL-8 in the pathogenesis of metastatic prostate cancer. We developed a biocompatible, cationic polylactide (CPLA) nanocarrier to complex with and efficiently deliver IL-8 siRNA to CaP cells in vitro and in vivo. CPLA IL-8 siRNA nanocomplexes (nanoplexes) protect siRNA from rapid degradation, are nontoxic, have a prolonged lifetime in circulation, and their net positive charge facilitates penetration of cell membranes and subsequent intracellular trafficking. Administration of CPLA IL-8 siRNA nanoplexes to immunodeficient mice bearing human CaP tumors produced significant antitumor activities...
Source: Immunology - May 8, 2016 Category: Allergy & Immunology Authors: Aalinkeel R, Nair B, Chen CK, Mahajan SD, Reynolds JL, Zhang H, Sun H, Sykes DE, Chadha KC, Turowski SG, Bothwell KD, Seshadri M, Chen C, Schwartz SA Tags: Immunology Source Type: research

MnAl-Layered Double Hydroxide Nanoparticles as a Dual-functional Platform for Magnetic Resonance Imaging and siRNA Delivery.
Abstract Multifunctional nanoparticles for cancer theranosis have been widely explored for effective cancer detection and therapy. In this research, dually functionalised manganese-based layered double hydroxide nanoparticles (Mn-LDHs) have been examined as an effective anticancer drug/gene delivery system and T1-weighted magnetic resonance imaging (MRI) modality for brain cancer theranostics. Such Mn-LDHs have been shown to accommodate dsDNA/siRNAs and efficiently deliver to Neuro-2a cells (N2a). Mn-LDHs have also shown high biocompatibility with low cytotoxicity. Importantly, the cell death-siRNA (CD-siRNA) deli...
Source: Chemistry - August 1, 2017 Category: Chemistry Authors: Zuo H, Chen W, Li B, Xu K, Cooper H, Gu Z, Xu ZP Tags: Chemistry Source Type: research

Modelling the response surface to predict the hydrodynamic diameters of theranostic magnetic siRNA nanovectors
Publication date: 15 January 2015 Source:International Journal of Pharmaceutics, Volume 478, Issue 1 Author(s): Stephanie David , Hervé Marchais , Didier Bedin , Igor Chourpa Short interfering RNAs (siRNAs) appear to be a promising tool to treat various human diseases, such as cancer via the RNA interference (RNAi) mechanism. Since the systemic administration of siRNAs is limited by their capacity to attain the site of action, novel delivery systems are needed. Previously, we reported the formulation of magnetic siRNA nanovectors (MSN) using electrostatic assembly of the following components: (1) functionalized superpar...
Source: International Journal of Pharmaceutics - December 7, 2014 Category: Drugs & Pharmacology Source Type: research

Red flags to screen for vertebral fracture in people presenting with low back pain
CONCLUSIONS: The available evidence suggests that only a few red flags are potentially useful in guiding clinical decisions to further investigate people suspected to have a vertebral fracture. Most red flags were not useful as screening tools to identify vertebral fracture in people with low back pain. In primary care, 'older age' was informative for 'unspecified vertebral fracture', and 'trauma' and 'corticosteroid use' were both informative for 'unspecified vertebral fracture' and 'osteoporotic vertebral fracture'. In secondary care, 'older age' was informative for 'osteoporotic vertebral fracture' and 'trauma' was info...
Source: Cochrane Database of Systematic Reviews - August 24, 2023 Category: General Medicine Authors: Christopher S Han Mark J Hancock Aron Downie Jeffrey G Jarvik Bart W Koes Gustavo C Machado Arianne P Verhagen Christopher M Williams Qiuzhe Chen Christopher G Maher Source Type: research

The dependencies of fronto‐parietal BOLD responses evoked by covert visual search suggest eye‐centred coding
Abstract Visual scenes explored covertly are initially represented in a retinal frame of reference (FOR). On the other hand, ‘later’ stages of the cortical network allocating spatial attention most probably use non‐retinal or non‐eye‐centred representations as they may ease the integration of different sensory modalities for the formation of supramodal representations of space. We tested if the cortical areas involved in shifting covert attention are based on eye‐centred or non‐eye‐centred coding by using functional magnetic resonance imaging. Subjects were scanned while detecting a target item (a regularly...
Source: European Journal of Neuroscience - February 13, 2013 Category: Neuroscience Authors: A. Atabaki, P.W. Dicke, H.‐O. Karnath, P. Thier Tags: Research Report Source Type: research

Real View Radiology—Impact on Search Patterns and Confidence in Radiology Education
Rationale and Objectives: Search patterns are important for radiologists because they enable systematic case review. Because radiology residents are exposed to so many imaging modalities and anatomic regions, and they rotate on-and-off service so frequently, they may have difficulty establishing effective search patterns. We developed Real View Radiology (RVR), an educational system founded on guided magnetic resonance imaging (MRI) case review and evaluated its impact on search patterns and interpretative confidence of junior radiology residents.Materials and Methods: RVR guides learners through unknown examinations by se...
Source: Academic Radiology - May 12, 2014 Category: Radiology Authors: Jared H. Bailey, Trenton D. Roth, Mark D. Kohli, Darel E. Heitkamp Tags: Recipient of the 2014 Memorial Award Source Type: research