Articles by Helen Harrington in JoVE
Self-reporting Scaffolds for 3-Dimensional Cell Culture Helen Harrington1, Felicity R.A.J. Rose2, Jonathan W. Aylott3, Amir M. Ghaemmaghami1 1School of Molecular Medical Sciences, University of Nottingham, 2Division of Drug Delivery and Tissue Engineering, University of Nottingham, 3Laboratory of Biophysics and Surface Analysis, University of Nottingham Biocompatible pH responsive sol-gel nanosensors can be incorporated into poly(lactic-co-glycolic acid) (PLGA) electrospun scaffolds. The produced self-reporting scaffolds can be used for in situ monitoring of microenvironmental conditions whilst culturing cells upon the scaffold. This is beneficial as the 3D cellular construct can be monitored in real-time without disturbing the experiment.
Other articles by Helen Harrington on PubMed
Evaluation of a Community-based Model of Rehabilitation Following Traumatic Brain Injury Neuropsychological Rehabilitation. Jun, 2006 | Pubmed ID: 16835154 In recent years there has been a growing trend towards community-based post-acute rehabilitation for individuals with traumatic brain injury (TBI), as opposed to the traditional centre-based model, based on the premise that these individuals will learn more effectively in settings where they usually have to perform. In the present study, outcomes at two years post-injury in 77 individuals with TBI, treated within the community were compared on measures of activities of daily living (ADL), vocational status, and emotional adjustment with those of 77 TBI patients individually matched for gender, age, education, occupation, post-traumatic amnesia (PTA) duration, Glasgow Coma Scale (GCS) score and time in inpatient rehabilitation, who had attended the hospital for outpatient therapy. There were no significant differences between groups in terms of employment outcomes or independence in personal or domestic ADL. However those treated in the community were less likely to be independent in shopping and financial management and reported more changes in communication and social behaviour. Due to constraints of time and resources, these patients had received fewer one-on-one therapy sessions and thus treatment costs were somewhat lower. Attendant care costs were also lower in the community treatment group. Strengths and weaknesses of community-based post-acute rehabilitation are discussed.
Biomimetic Tissues on a Chip for Drug Discovery Drug Discovery Today. Feb, 2012 | Pubmed ID: 22094245 Developing biologically relevant models of human tissues and organs is an important enabling step for disease modeling and drug discovery. Recent advances in tissue engineering, biomaterials and microfluidics have led to the development of microscale functional units of such models also referred to as 'organs on a chip'. In this review, we provide an overview of key enabling technologies and highlight the wealth of recent work regarding on-chip tissue models. In addition, we discuss the current challenges and future directions of organ-on-chip development.
The Glycosylation Pattern of Common Allergens: the Recognition and Uptake of Der P 1 by Epithelial and Dendritic Cells is Carbohydrate Dependent PloS One. 2012 | Pubmed ID: 22479478 Allergens are initiators of both innate and adaptive immune responses. They are recognised at the site of entry by epithelial and dendritic cells (DCs), both of which activate innate inflammatory circuits that can collectively induce Th2 immune responses. In an attempt to have a better understanding of the role of carbohydrates in the recognition and uptake of allergens by the innate immune system, we defined common glycosylation patterns in major allergens. This was done using labelled lectins and showed that allergens like Der p 1 (Dermatophagoides pteronyssinus group 1), Fel d 1 (Felis domisticus), Ara h 1 (Arachis hypogaea), Der p 2 (Dermatophagoides pteronyssinus group 2), Bla g 2 (Blattella germanica) and Can f 1 (Canis familiaris) are glycosylated and that the main dominant sugars on these allergens are 1-2, 1-3 and 1-6 mannose. These observations are in line with recent reports implicating the mannose receptor (MR) in allergen recognition and uptake by DCs and suggesting a major link between glycosylation and allergen recognition. We then looked at TSLP (Thymic Stromal Lymphopoietin) cytokine secretion by lung epithelia upon encountering natural Der p 1 allergen. TSLP is suggested to drive DC maturation in support of allergic hypersensitivity reactions. Our data showed an increase in TSLP secretion by lung epithelia upon stimulation with natural Der p 1 which was carbohydrate dependent. The deglycosylated preparation of Der p 1 exhibited minimal uptake by DCs compared to the natural and hyperglycosylated recombinant counterparts, with the latter being taken up more readily than the other preparations. Collectively, our data indicate that carbohydrate moieties on allergens play a vital role in their recognition by innate immune cells, implicating them in downstream deleterious Th2 cell activation and IgE production.