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Full-Text Articles in Life Sciences

Melittin: A Natural Component Of Honeybee Venom As A Potential Anti-Cancer Therapy, Niamh Donnellan, Anne M. Friel Dec 2023

Melittin: A Natural Component Of Honeybee Venom As A Potential Anti-Cancer Therapy, Niamh Donnellan, Anne M. Friel

SURE Journal: Science Undergraduate Research Experience Journal

Cancer is a major cause of death worldwide and while chemotherapy is the main approach there are many negative associations in current treatment procedures. These include lack of selectivity, side effects and drug resistance. The hallmarks of cancer are a fundamental concept which aids the development of new means to treat human cancers through the understanding of the acquisition of these hallmarks from cells.

Melittin is a major peptide component of bee venom which has shown to be efficacious as an anticancer agent in preclinical and animal models. Melittin has many biological functions including pore formation in the phospholipid bilayer …


Therapies For Mitochondrial Disorders, Kayli Sousa Smyth, Anne Mulvihill Dec 2022

Therapies For Mitochondrial Disorders, Kayli Sousa Smyth, Anne Mulvihill

SURE Journal: Science Undergraduate Research Experience Journal

Mitochondria are cytoplasmic, double-membrane organelles that synthesise adenosine triphosphate (ATP). Mitochondria contain their own genome, mitochondrial DNA (mtDNA), which is maternally inherited from the oocyte. Mitochondrial proteins are encoded by either nuclear DNA (nDNA) or mtDNA, and both code for proteins forming the mitochondrial oxidative phosphorylation (OXPHOS) complexes of the respiratory chain. These complexes form a chain that allows the passage of electrons down the electron transport chain (ETC) through a proton motive force, creating ATP from adenosine diphosphate (ADP). This study aims to explore current and prospective therapies for mitochondrial disorders (MTDS). MTDS are clinical syndromes coupled with abnormalities …


Advances In 3d Culture Systems For Therapeutic Discovery And Development In Brain Cancer, Janith Wanigasekara, Patrick J. Cullen, Paula Bourke, Brijesh Tiwari, James F. Curtin Nov 2022

Advances In 3d Culture Systems For Therapeutic Discovery And Development In Brain Cancer, Janith Wanigasekara, Patrick J. Cullen, Paula Bourke, Brijesh Tiwari, James F. Curtin

Articles

This review focuses on recent advances in 3D culture systems that promise more accurate therapeutic models of the glioblastoma multiforme (GBM) tumor microenvironment (TME), such as the unique anatomical, cellular, and molecular features evident in human GBM. The key components of a GBM TME are outlined, including microbiomes, vasculature, extracellular matrix (ECM), infiltrating parenchymal and peripheral immune cells and molecules, and chemical gradients. 3D culture systems are evaluated against 2D culture systems and in vivo animal models. The main 3D culture techniques available are compared, with an emphasis on identifying key gaps in knowledge for the development of suitable platforms …


Ultrasound 96 Probe Device Protocol For Cancer Cell Treatment, Aisling Field, Brijesh K. Tiwari, James F. Curtin, Julie R M Mondala, Janith Wanigasekara Jan 2022

Ultrasound 96 Probe Device Protocol For Cancer Cell Treatment, Aisling Field, Brijesh K. Tiwari, James F. Curtin, Julie R M Mondala, Janith Wanigasekara

Articles

Ultrasound is a sound wave with frequencies ranging between 20 kHz and 20 MHz. Ultrasound is able to temporarily and repeatedly open the BBB safely and enhance chemotherapeutic delivery without adverse effects. This novel technique in drug delivery benefits from the powerful ability of ultrasound to produce cavitation activity. Cavitation is the generation and activity of gas-filled bubbles in a medium exposed to ultrasound. As the pressure wave passes through the media, gas bubbles expand at low pressure and contract at high pressure. This leads to oscillation which produces a circulating fluid flow known as microstreaming around the bubble with …


Plasma Induced Reactive Oxygen Species-Dependent Cytotoxicity In Glioblastoma 3d Tumourspheres, Janith Wanigasekara, Carlos Barcia, Patrick J. Cullen, Brijesh Tiwari, James F. Curtin Jan 2022

Plasma Induced Reactive Oxygen Species-Dependent Cytotoxicity In Glioblastoma 3d Tumourspheres, Janith Wanigasekara, Carlos Barcia, Patrick J. Cullen, Brijesh Tiwari, James F. Curtin

Articles

The aim of this study was to determine the effects of a pin‐to‐plate cold atmospheric plasma (CAP) on U‐251 MG three‐dimensional (3D) glioblastoma spheroids under different conditions. 3D tumorspheres showed higher resistance to the CAP treatment compared to 2D monolayer cells. A single CAP treatment was able to induce cytotoxicity, while multiple CAP treatments augmented this effect. CAP was also able to induce cytotoxicity throughout the tumoursphere, and we identified that reactive oxygen species(ROS) plays a major role, while H2O2plays a partial role in CAP‐induced cytotoxicity in tumour-spheres. We conclude that ROS‐dependent cytotoxicity is induced uniformly throughout glioblastoma and epidermoid …


U-251mg Spheroid Generation Using A Scaffold Based Method Protocol, Lara J. Carroll, Brijesh K. Tiwari, James F. Curtin, Janith Wanigasekara May 2021

U-251mg Spheroid Generation Using A Scaffold Based Method Protocol, Lara J. Carroll, Brijesh K. Tiwari, James F. Curtin, Janith Wanigasekara

Articles

3D cell culture is a technique that is used to grow cells in vitro that will mimic an in vivo environment. 3D cell models are a helpful learning tool for researchers to better understand disease mechanisms and to explore different therapeutic properties of drugs. 3D cell cultures can be developed using patient derived cancer cells. Once they have been grown, these 3D cells can be used to screen for small molecule drugs or for genetic modification in for analysis of disease pathways or to predict drug treatments toxicity or efficacy. 3D cell cultures are a big step towards the more …


U-251mg Spheroid Generation Using Low Attachment Plate Method Protocol, Lara J. Carroll, Brijesh K. Tiwari, James F. Curtin, Janith Wanigasekara May 2021

U-251mg Spheroid Generation Using Low Attachment Plate Method Protocol, Lara J. Carroll, Brijesh K. Tiwari, James F. Curtin, Janith Wanigasekara

Articles

3D cell culture is a process used to grow cells in vitro to mimic an in vivo environment. 3D cell models are very useful for understanding disease mechanisms and exploring drug therapeutics. 3D cultures can be grown from cells taken from cancer organoids in patients. Once grown, they can be used to screen for small molecule drugs or they can be genetically modified in order to analyse disease pathways or predict the toxicity or efficacy of a drug treatment. These cultures decrease the need to use animals in research and provides more reliable results as it uses human physiology. This …


U-251mg Spheroid Generation Using Hanging Drop Method Protocol, Lara J. Carroll, Brijesh K. Tiwari, James F. Curtin, Janith Wanigasekara May 2021

U-251mg Spheroid Generation Using Hanging Drop Method Protocol, Lara J. Carroll, Brijesh K. Tiwari, James F. Curtin, Janith Wanigasekara

Articles

The use of 3D cell culture has been a major step in developing cellular models that can mimic physiological tissues. Traditional 2D cell cultures are often unable to accurately represent the cellular functions and responses that are present in tissues, as a result, research findings based on 2D cultures tend to be skewed with limited predictive capability. 3D cell cultures can be grown from cells obtained from cancer organoids in patients. These models are useful for understanding disease mechanisms and exploring drug therapeutics in areas such as toxicity and efficacy. In order to gather more physiologically relevant data, a variety …


Monitoring Stem Cell Differentiation Using Raman Microspectroscopy: Chondrogenic Differentiation, Towards Cartilage Formation, Francesca Ravera, Esen Efeoglu, Hugh Byrne Jan 2021

Monitoring Stem Cell Differentiation Using Raman Microspectroscopy: Chondrogenic Differentiation, Towards Cartilage Formation, Francesca Ravera, Esen Efeoglu, Hugh Byrne

Articles

Mesenchymal Stem Cells (MSCs) have the ability to differentiate into chondrocytes, the only cellular components of cartilage and are therefore ideal candidates for cartilage and tissue repair technologies. Chondrocytes are surrounded by cartilage-like extracellular matrix (ECM), a complex network rich in glycosaminoglycans, proteoglycans, and collagen, which, together with a multitude of intracellular signalling molecules, trigger the chondrogenesis and allow the chondroprogenitor to acquire the spherical morphology of the chondrocytes. However, although the mechanisms of the differentiation of MSCs have been extensively explored, it has been difficult to provide a holistic picture of the process, in situ. Raman Micro Spectroscopy (RMS) …


A Mechanistic Study On The Non-Genotoxic Carcinogenicity Of The Food Contaminant Semicarbazide, Daniel P. Fitzpatrick Oct 2020

A Mechanistic Study On The Non-Genotoxic Carcinogenicity Of The Food Contaminant Semicarbazide, Daniel P. Fitzpatrick

SURE Journal: Science Undergraduate Research Experience Journal

Semicarbazide was brought to the forefront of scientific discussions by the scientific community in the early 2000’s as the substance was discovered in several food products from both synthetic and natural sources. Although semicarbazide was processed through several toxicological assays and classified as a non-genotoxic carcinogen, underwhelming amounts of toxicological data exists for the compound. The present study is one of the first in-vitro studies to examine the relationship between sub-pathophysiological concentrations of reactive oxygen species and the anomalous non-genotoxic carcinogenicity induced by semicarbazide through the upregulation of intracellular signalling pathways. A novel finding of the present study was where …


Bioavailability And Modes Of Action Of Novel Metal Based Phenanthroline Drugs, Tadhg O’Leary Jul 2020

Bioavailability And Modes Of Action Of Novel Metal Based Phenanthroline Drugs, Tadhg O’Leary

Doctoral

Metal-basedcompounds have been utilised as chemotherapeutic agents for the last four decades due to their well-documented and clinically relevant anti-tumour properties.Acquired resistance is a challenge for the clinical use of these compounds and there is a continuing need to search for potential new therapeutic agents. Herein, the potential of two metal-basedcompounds containing chelated1,10-phenanthroline (1,10-Phen), one manganese-based (CMPD 73)andonecopper-based (CMPD 74), to act as novel therapeutic agents is explored.CMPD 73 displayed high micromolar (IC50>100μM) cytotoxic properties againstvarious cell systems but interestingly displayed increased cytotoxicity against ovarian (A2780), lung (A549) and cisplatin resistant mesothelioma cells(IC5040-50μM). CMPD 74 was equally cytotoxic against …


3d Mammalian Cell Culture Models In Toxicology Testing, Janith Wanigasekara, Brijesh K. Tiwari, James Curtin Apr 2020

3d Mammalian Cell Culture Models In Toxicology Testing, Janith Wanigasekara, Brijesh K. Tiwari, James Curtin

Articles

3D cell culture can be successfully used as an alternative to laboratory animals, and as a cost effective and time-saving tissue culture technique, which also reduces the trial period for drug testing.


Cold Atmospheric Plasma Induces Silver Nanoparticle Uptake, Oxidative Dissolution And Enhanced Cytotoxicity In Glioblastoma Multiforme Cells, Eline Manaloto, Aoife Gowen, Anna Lesniak, Zhonglei He, Alan Casey, Patrick J. Cullen, James Curtin Jan 2020

Cold Atmospheric Plasma Induces Silver Nanoparticle Uptake, Oxidative Dissolution And Enhanced Cytotoxicity In Glioblastoma Multiforme Cells, Eline Manaloto, Aoife Gowen, Anna Lesniak, Zhonglei He, Alan Casey, Patrick J. Cullen, James Curtin

Articles

Silver nanoparticles (AgNP) emerged as a promising reagent for cancer therapy with oxidative stress implicated in the toxicity. Meanwhile, studies reported cold atmospheric plasma (CAP) generation of reactive oxygen and nitrogen species has selectivity towards cancer cells. Gold nanoparticles display synergistic cytotoxicity when combined with CAP against cancer cells but there is a paucity of information using AgNP, prompting to investigate the combined effects of CAP using dielectric barrier discharge system (voltage of 75 kV, current is 62.5 mA, duty cycle of 7.5kVA and input frequency of 50–60Hz) and 10 nm PVA-coated AgNP using U373MG Glioblastoma Multiforme cells. Cytotoxicity in …


Optimisation Of Estrogen Receptor Subtype-Selectivity Of A 4-Aryl-4h-Chromene Scaffold Previously Identified By Virtual Screening, Miriam Carr, Andrew Knox, Daniel Nevin, Niamh O'Boyle, Shu Wang, Billy Egan, Thomas Mccabe, Brendan Twamley, Daniela Zisterer, David Lloyd, Mary Meegan Jan 2020

Optimisation Of Estrogen Receptor Subtype-Selectivity Of A 4-Aryl-4h-Chromene Scaffold Previously Identified By Virtual Screening, Miriam Carr, Andrew Knox, Daniel Nevin, Niamh O'Boyle, Shu Wang, Billy Egan, Thomas Mccabe, Brendan Twamley, Daniela Zisterer, David Lloyd, Mary Meegan

Articles

4-Aryl-4H-Chromene derivatives have been previously shown to exhibit anti-proliferative, apoptotic and anti-angiogenic activity in a variety of tumor models in vitro and in vivo generally via activation of caspases through inhibition of tubulin polymerisation. We have previously identified by Virtual Screening (VS) a 4-aryl-4H-chromene scaffold, of which two examples were shown to bind Estrogen Receptor α and β with low nanomolar affinity and <20-fold selectivity for α over β and low micromolar anti-proliferative activity in the MCF-7 cell line. Thus, using the 4-aryl-4H-chromene scaffold as a starting point, a series of compounds with a range of basic arylethers at C-4 and modifications at the C3-ester substituent of the benzopyran ring were synthesised, producing some potent ER antagonists in the MCF-7 cell line which were highly selective for ERα (compound 35; 350-fold selectivity) or ERβ (compound 42; 170-fold selectivity).


Development Of Methodologies For Raman Spectral Analysis Of Human Saliva For Detection Of Oral Cancer, Genecy Calado Jan 2020

Development Of Methodologies For Raman Spectral Analysis Of Human Saliva For Detection Of Oral Cancer, Genecy Calado

Doctoral

Oral cancer is one of the most common malignancies worldwide, with over 350,000 to 400,000 new cases reported each year. Early detection, followed by appropriate treatment, can increase cure rates to 80 or 90%, and greatly improve the quality of life by minimising extensive, debilitating treatments. Usually, the clinical diagnosis of most head and neck neoplasms, including oral cancer, is performed through time-consuming and invasive biopsies followed by histological examination of the excised tissue and may present psychological trauma and risk of infection to patients. In addition, histological grading can be subjective, as it is based on subtle morphological changes. …


Forscells: 40-Days Fixed Prepared Reagent For Detection Of Anti-Forssman Inhumans, Sofia Ferreira, Cristiana Mourato, Alyssa Corpuz, Sofia Galvão, Camilla Hesse, Clara Rocha, Carlos Jesus, Fernando Mendes Jan 2020

Forscells: 40-Days Fixed Prepared Reagent For Detection Of Anti-Forssman Inhumans, Sofia Ferreira, Cristiana Mourato, Alyssa Corpuz, Sofia Galvão, Camilla Hesse, Clara Rocha, Carlos Jesus, Fernando Mendes

Articles

In 2012, the FORS system was accepted by the International Society of Blood Transfusion as the 31st blood group system. Forssman (Fs) antigen (Ag) expression is most commonly found on sheep red blood cells (RBC) but rare in human RBC. Anti-Fs antibodies (Ab) are naturally occurring in human sera and are predominantly IgM but they can also be IgG. To this day, the global prevalence of the FORS system is unknown. Currently, there is a lack of natural FORS1-positive RBC available to use for anti-Fs screening in large populations. This study was designed to produce FORS1-positive cells viable for …


Immediate-Early Genes And Delayed Primary Response Genes Regulated By Nmu In Skbr3 Her-2 Positive Breast Cancer Cell Line, Jessica Murphy, Sweta Rani Sep 2019

Immediate-Early Genes And Delayed Primary Response Genes Regulated By Nmu In Skbr3 Her-2 Positive Breast Cancer Cell Line, Jessica Murphy, Sweta Rani

SURE Journal: Science Undergraduate Research Experience Journal

Background
Breast cancer is a heterogeneous disease that consists of varying genetic, cellular and molecular subtypes with unique characteristics. Due to the multiple subtypes and molecular markers of breast cancer, successful clinical treatment is hampered by the lack of reliable biomarkers. HER2-positive breast cancer is an aggressive subtype associated with poor patient prognosis. Although survival rates have dramatically increased due to the development of Trastuzumab in 1997, many patients develop a resistance to this therapeutic treatment and relapse over time. Rani et al. (2014), have associated the acquirement of resistance to HER2-treatment with Neuromedin U, but the mechanisms by …


Cold Atmospheric Plasma Induces Accumulation Of Lysosomes And Caspase-Independent Cell Death In U373mg Glioblastoma Multiforme Cells, Gillian Conway, Zhonglei He, Ana L. Hutanu, George P. Cribaro, Eline Manaloto, Alan Casey, Damien Traynor, Vladimir Milosavljevic, Orla Howe, Carlos Barcia, James T. Murray, Patrick Cullen, James Curtin Sep 2019

Cold Atmospheric Plasma Induces Accumulation Of Lysosomes And Caspase-Independent Cell Death In U373mg Glioblastoma Multiforme Cells, Gillian Conway, Zhonglei He, Ana L. Hutanu, George P. Cribaro, Eline Manaloto, Alan Casey, Damien Traynor, Vladimir Milosavljevic, Orla Howe, Carlos Barcia, James T. Murray, Patrick Cullen, James Curtin

Articles

Room temperature Cold Atmospheric Plasma (CAP) has shown promising efficacy for the treatment of cancer but the exact mechanisms of action remain unclear. Both apoptosis and necrosis have been implicated as the mode of cell death in various cancer cells. We have previously demonstrated a caspase-independent mechanism of cell death in p53-mutated glioblastoma multiforme (GBM) cells exposed to plasma. The purpose of this study was to elucidate the molecular mechanisms involved in caspase-independent cell death induced by plasma treatment. We demonstrate that plasma induces rapid cell death in GBM cells, independent of caspases. Accumulation of vesicles was observed in plasma …


Visceral Adipose Tissue Modulates Radiosensitivity In Oesophageal Adenocarcinoma, Ann Marie Mongan, Niamh Lynam-Lennon, Suzanne Doyle, Rory Casey, Eibhlin Carr, Aoife Cannon, Melissa J Conroy, Graham P Pidgeon, Lorraine Brennan, Joanne Lysaght, John V. Reynolds, Jacintha O’Sullivan Jan 2019

Visceral Adipose Tissue Modulates Radiosensitivity In Oesophageal Adenocarcinoma, Ann Marie Mongan, Niamh Lynam-Lennon, Suzanne Doyle, Rory Casey, Eibhlin Carr, Aoife Cannon, Melissa J Conroy, Graham P Pidgeon, Lorraine Brennan, Joanne Lysaght, John V. Reynolds, Jacintha O’Sullivan

Articles

Oesophageal adenocarcinoma (OAC) is an exemplar model of obesity-associated cancer. Response to neoadjuvant chemoradiotherapy (NA CRT) is a clinical challenge. We examined if visceral adipose tissue and obesity status alter radiosensitivity in OAC. The radioresistant (OE33R) and radioresponsive (OE33P) OAC isogenic model was cultured with adipose tissue conditioned media from three patient cohorts: non-cancer patients, surgery only OAC patients and NA CRT OAC patients. Cell survival was characterised by clonogenic assay, metabolomic profiling by nuclear magnetic resonance spectroscopy and adipokine receptor gene expression by qPCR. A retrospective in vivo study compared tumour response to NA CRT in normal weight (n=53) …


Ultrasound/Elastography Techniques, Lipidomic And Blood Markers Compared To Magnetic Resonance Imaging In Non-Alcoholic Fatty Liver Disease Adults, Irene Cantero, Mariana Elorz, Itziar Abete, Bertha Araceli Marin, Jose Ignacio Herrero, Jose Ignacio Monreal, Alberto Benito, Jorge Quiroga, Ana Martínez, Pilar Huarte, Juan Isidro Uriz-Otano, Josep Antoni Tur, John Kearney, J. Alfredo Martinez, M. Angeles Zulet Jan 2019

Ultrasound/Elastography Techniques, Lipidomic And Blood Markers Compared To Magnetic Resonance Imaging In Non-Alcoholic Fatty Liver Disease Adults, Irene Cantero, Mariana Elorz, Itziar Abete, Bertha Araceli Marin, Jose Ignacio Herrero, Jose Ignacio Monreal, Alberto Benito, Jorge Quiroga, Ana Martínez, Pilar Huarte, Juan Isidro Uriz-Otano, Josep Antoni Tur, John Kearney, J. Alfredo Martinez, M. Angeles Zulet

Articles

Introduction: Non-alcoholic fatty liver disease (NAFLD) may progress to steatohepatitis, cirrhosis and complicated hepatocellular carcinoma with defined differential symptoms and manifestations. Objective: To evaluate the fatty liver status by several validated approaches and to compare imaging techniques, lipidomic and routine blood markers with magnetic resonance imaging in adults subjects with non-alcoholic fatty liver disease. Materials and methods: A total of 127 overweight/obese with NAFLD, were parallelly assessed by Magnetic Resonance Imaging (MRI), ultrasonography, transient elastography and a validated metabolomic designed test to diagnose NAFLD in this cross-sectional study. Body composition (DXA), hepatic related biochemical measurements as well as the Fatty …


Cold Atmospheric Plasma Induces Atp-Dependent Endocytosis Of Nanoparticles And Synergistic U373mg Cancer Cell Death, Zhonglei He, Kangze Liu, Eline Manaloto, Alan Casey, George P. Cribaro, Hugh Byrne, Furong Tian, Carlos Barcia, Gillian Conway, Patrick Cullen, James Curtin Mar 2018

Cold Atmospheric Plasma Induces Atp-Dependent Endocytosis Of Nanoparticles And Synergistic U373mg Cancer Cell Death, Zhonglei He, Kangze Liu, Eline Manaloto, Alan Casey, George P. Cribaro, Hugh Byrne, Furong Tian, Carlos Barcia, Gillian Conway, Patrick Cullen, James Curtin

Articles

Gold nanoparticles (AuNP) have potential as both diagnostic and therapeutic vehicles. However, selective targeting and uptake in cancer cells remains challenging. Cold atmospheric plasma (CAP) can be combined with AuNP to achieve synergistic anti-cancer cytotoxicity. To explore synergistic mechanisms, we demonstrate both rate of AuNP uptake and total amount accumulated in U373MG Glioblastoma multiforme (GBM) cells are signifcantly increased when exposed to 75kV CAP generated by dielectric barrier discharge. No signifcant changes in the physical parameters of AuNP were caused by CAP but active transport mechanisms were stimulated in cells. Unlike many other biological efects of CAP, long-lived reactive species …


A Physical Biology, The Electron Neutrino Mass, And The Role Of Quantum Mechanics In Nature, Maurice Goodman Jan 2018

A Physical Biology, The Electron Neutrino Mass, And The Role Of Quantum Mechanics In Nature, Maurice Goodman

Articles

In science we need to remove physics and earth science from the fundamental sciences and treat Biology as a fundamental natural (physical) science. Attempts to keep Biology autonomous because it is holistic, from the physical sciences, are just disguised anthropocentrism. Physical sciences have holistic features also. The autonomy of Biology is at odds with a holistic, integrated, science and is preventing progress in science. For example, every cell needs a 'global' communication system to keep order and stability with rapid information transfer across cellular scales. We have yet to figure out how this is achieved. Over the last 30 years, …


Comparative Studies Of Cellular Viability Levels On 2d And 3d In Vitro Culture Matrices, Alan Casey, Hugh Byrne, Mahmoud Gargotti, Ulises Lopez Gonzalez Sep 2017

Comparative Studies Of Cellular Viability Levels On 2d And 3d In Vitro Culture Matrices, Alan Casey, Hugh Byrne, Mahmoud Gargotti, Ulises Lopez Gonzalez

Articles

In this study, the cellular viability and function of immortalized human cervical and dermal cells are monitored and compared in conventional 2D and two commercial 3D membranes, Collagen and Geltrex, of varying working concentration and volume. Viability was monitored with the aid of the Alamar Blue assay, cellular morphology was monitored with confocal microscopy, and cell cycle studies and cell death mechanism studies were performed with flow cytometry. The viability studies showed apparent differences between the 2D and 3D culture systems, the differences attributed in part to the physical transition from 2D to 3D environment causing alterations to effective resazurin …


Non-Thermal Atmospheric Plasma Induces Ros-Independent Cell Death In U373mg Glioma Cells And Augments The Cytotoxicity Of Temozolomide, Gillian Conway, Alan Casey, Vladimir Milosavljevic, Yupeng Liu, Orla L. Howe, Patrick Cullen, James Curtin Feb 2016

Non-Thermal Atmospheric Plasma Induces Ros-Independent Cell Death In U373mg Glioma Cells And Augments The Cytotoxicity Of Temozolomide, Gillian Conway, Alan Casey, Vladimir Milosavljevic, Yupeng Liu, Orla L. Howe, Patrick Cullen, James Curtin

Articles

Non-thermal atmospheric plasma (NTAP) is an ionised gas produced under high voltage that can generate short-lived chemically active species and induce a cytotoxic insult in cancer cells. Cell-specific resistance to NTAP-mediated cytotoxicity has been reported in the literature. The aim of this study was to determine whether resistance against NTAP could be overcome using the human glioma cell line U373MG.

Methods:

Non-thermal atmospheric plasma was generated using a Dielectric Barrier Device (DBD) system with a maximum voltage output of 120 kV at 50 Hz. The viability of U373MG GBM cells and HeLa cervical carcinoma cells was determined using morphology, flow …


Cell Viability Assessment Using The Alamar Blue Assay: A Comparison Of 2d And 3d Cell Culture Models, Franck Bonnier, Mark Keating, Tomasz P. Wrobel, Katarsyna Majzner, Malgorzata Baranska, Amaya Garcia, Alfonso Blanco, Hugh Byrne Feb 2015

Cell Viability Assessment Using The Alamar Blue Assay: A Comparison Of 2d And 3d Cell Culture Models, Franck Bonnier, Mark Keating, Tomasz P. Wrobel, Katarsyna Majzner, Malgorzata Baranska, Amaya Garcia, Alfonso Blanco, Hugh Byrne

Articles

Comparisons of 2D and 3D cell culture models in literature have indicated differences in cellular morphology and metabolism, commonly attributed the better representation of in vivo conditions of the latter cell culture environment. Thus, interest in the use of 3D collagen gels for in vitro analysis has been growing. Although comparative studies to date have indicated an enhanced resistance of cells on collagen matrices against different toxicants, in the present study it is demonstrated that non-adapted protocols can lead to misinterpretation of results obtained from classical colorometric dye-based cytotoxic assays. Using the well established Alamar Blue assay, the …


Divergent Mechanisms Of Interaction Of Helicobacter Pylori And Campylobacter Jejuni With Mucus And Mucins, Julie Ann Naughton, Karina Mariño, Brendan Dolan, Colm Reid, Ronan Gough, Mary Gallagher, Michelle Kilcoyne, Jared Gerlachscience,, Lokesh Joshi, Pauline Rudd, Stephen Carrington, Billy Bourke, Marguerite Clyne Aug 2013

Divergent Mechanisms Of Interaction Of Helicobacter Pylori And Campylobacter Jejuni With Mucus And Mucins, Julie Ann Naughton, Karina Mariño, Brendan Dolan, Colm Reid, Ronan Gough, Mary Gallagher, Michelle Kilcoyne, Jared Gerlachscience,, Lokesh Joshi, Pauline Rudd, Stephen Carrington, Billy Bourke, Marguerite Clyne

Articles

Helicobacter pylori and Campylobacter jejuni colonize the stomach and intestinal mucus, respectively. Using a combination of mucus-secreting cells, purified mucins, and a novel mucin microarray platform, we examined the interactions of these two organisms with mucus and mucins. H. pylori and C. jejuni bound to distinctly different mucins. C. jejuni displayed a striking tropism for chicken gastrointestinal mucins compared to mucins from other animals and preferentially bound mucins from specific avian intestinal sites (in order of descending preference: the large intestine, proximal small intestine, and cecum). H. pylori bound to a number of animal mucins, including porcine stomach mucin, but …


The Bio-Nano-Interface In Predicting Nanoparticle Fate And Behaviour In Living Organisms: Towards Grouping And Categorising Nanomaterials And Ensuring Nanosafety By Design, Hugh Byrne, Arti Ahluwalia, Diana Boraschi,, Bengt Fadeel, Peter Gehr, Arno C. Gutleb, Michaela Kendall, Manthos Papadopoulos, Iseult Lynch Jan 2013

The Bio-Nano-Interface In Predicting Nanoparticle Fate And Behaviour In Living Organisms: Towards Grouping And Categorising Nanomaterials And Ensuring Nanosafety By Design, Hugh Byrne, Arti Ahluwalia, Diana Boraschi,, Bengt Fadeel, Peter Gehr, Arno C. Gutleb, Michaela Kendall, Manthos Papadopoulos, Iseult Lynch

Articles

In biological media, nanoparticles acquire a coating of biomolecules (proteins, lipids, polysaccharides) from their surroundings, which reduces their surface energy and confers a biological identity to the particles. This adsorbed layer is the interface between the nanomaterial and living systems and therefore plays a significant role in determining the fate and behaviour of the nanoparticles. This review summarises the state of the art in terms of understanding the bio-nano interface and provides direction for potential future research directions and some recommendations for future priorities and strategies to support the safe implementation of nanotechnologies. The central premise is that nanomaterials must …


Reactive Oxygen Species Mediated Dna Damage In Human Lung Alveolar Epithelial (A549) Cells From Exposure To Non-Cytotoxic Mfi-Type Zeolite Nanoparticles, Kunal Bhattacharya, Pratap Naha, Izabela Naydenova, Svetlana Mintova, Hugh Byrne Dec 2012

Reactive Oxygen Species Mediated Dna Damage In Human Lung Alveolar Epithelial (A549) Cells From Exposure To Non-Cytotoxic Mfi-Type Zeolite Nanoparticles, Kunal Bhattacharya, Pratap Naha, Izabela Naydenova, Svetlana Mintova, Hugh Byrne

Articles

Increasing utilization of engineered nanoparticles in the field of electronics and biomedical applications demands an assessment of risk associated with deliberate or accidental exposure. Metal based nanoparticles are potentially most important of all the nanoparticles in terms of health risks. Microporousalumino-silicates and pure silicates named as zeolites and zeo-type materials with variety of structures, chemical compositions, particle sizes and morphologies have a significant number of industrial uses such as in catalysis, sorption and ion-exchange processes. In particular, the nanosized particles due to their unique properties are used in hybrid organic-inorganic materials for photography, photonics, electronics, labeling, imaging, and sensing. The …


Spectral Cross Correlation As A Supervised Approach For The Analysis Of Complex Raman Datasets: The Case Of Nanoparticles In Biological Cells, Mark Keating, Franck Bonnier, Hugh Byrne Oct 2012

Spectral Cross Correlation As A Supervised Approach For The Analysis Of Complex Raman Datasets: The Case Of Nanoparticles In Biological Cells, Mark Keating, Franck Bonnier, Hugh Byrne

Articles

Spectral Cross-correlation is introduced as a methodology to identify the presence and subcellular distribution of nanoparticles in cells. Raman microscopy is employed to spectroscopically image biological cells previously exposed to polystyrene nanoparticles, as a model for the study of nano-bio interactions. The limitations of previously deployed strategies of K-means clustering analysis and principal component analysis are discussed and a novel methodology of Spectral Cross Correlation Analysis is introduced and compared with the performance of Classical Least Squares Analysis, in both unsupervised and supervised modes. The previous study demonstrated the feasibility of using Raman spectroscopy to map cells and identify polystyrene …


Inhibition Of Burkholderia Multivorans Adhesion To Lung Epithelial Cells By Bivalent Lactosides, Ciara Wight, Rosaria Leyden, Paul V. Murphy, Máire Callaghan, Trinidad Velasco-Torrijos, Siobhan Mcclean Aug 2012

Inhibition Of Burkholderia Multivorans Adhesion To Lung Epithelial Cells By Bivalent Lactosides, Ciara Wight, Rosaria Leyden, Paul V. Murphy, Máire Callaghan, Trinidad Velasco-Torrijos, Siobhan Mcclean

Articles

Burkholderia cepacia complex (Bcc) is an opportunistic pathogen in cystic fibrosis patients which is inherently resistant to antimicrobial agents. The mechanisms of attachment and pathogenesis of Bcc, a group of 17 species, are poorly understood. The most commonly identified Bcc species in newly colonised patients, Burkholderia multivorans, continues to be acquired from the environment. Development of therapies which can prevent or reduce the risk of colonization on exposure to Bcc in the environment would be a better alternative to antimicrobial agents. Previously, it has been shown that Bcc strains bound to many glycolipid receptors on lung epithelia. Using a …