Adverse effects of fullerenes on endothelial cells: Fullerenol C60(OH)24 induced tissue factor and ICAM-1 membrane expression and apoptosis in vitro

We studied the effects of a C60 water suspension at 4 μg/mL (nC60) and the water soluble fullerenol C60(OH)24 at final concentrations of 1–100 μg/mL on human umbilical vein endothelial cells (HUVECs) in culture. We found that a 24 hr treatment of HUVECs with C60(OH)24 at 100 μg/mL significantly increased cell surface expression of ICAM-1(CD54) (67 ± 4% CD54+ cells vs. 19 ± 2 % CD54+ cells in control; p < 0.001). In addition, this treatment induced the expression of tissue factor (CD142) on HUVECs (54 ± 20% CD142+ cells vs 4 ± 2% CD142+ cells in control; p = 0.008) and increased exposure of phosphatidylserine (PS) (29 ± 2% PS+ cells vs. 12 ± 5% PS+ cells in control; p < 0.001). Analysis of cell cycle and DNA fragmentation (TUNEL) showed that both nC60 and C60(OH)24 caused G1 arrest of HUVECs and C60(OH)24 induced significant apoptosis (21 ± 2% TUNEL+ cells at 100 μg/mL of C60(OH)24 vs. 4 ± 2% TUNEL+ cells in control; p < 0.001). We also demonstrated that both nC60 and C60(OH)24 induced a rapid concentration dependent elevation of intracellular calcium [Ca2+]i. This could be inhibited by EGTA, suggesting that the source of [Ca2+]i in fullerene stimulated calcium flux is predominantly from the extracellular environment. In conclusion, fullerenol C60(OH)24 had both pro-inflammatory and pro-apoptotic effects on HUVECs, indicating possible adverse effects of fullerenes on the endothelium

The Social Life of Time and Methods: Studying London’s Temporal Architectures

This paper contributes to work on the social life of time. It focuses on how time is doubled; produced by and productive of the relations and processes it operates through. In particular, it explores the methodological implications of this conception of time for how social scientists may study the doubledness of time. It draws on an allied move within the social sciences to see methods as themselves doubled; as both emerging from and constitutive of the social worlds that they seek to understand. We detail our own very different methodological experiments with studying the social life of time in London, engaging interactive documentary to elucidate nonlinear imaginaries of space-time in London’s pop-up culture (Ella Harris) and encountering time on a series of walks along a particular stretch of road in south east London (Beckie Coleman). While clearly different projects in terms of their content, ambition and scope, in bringing these projects together we show the ability of our methods to grasp and perform from multiple angles and scales what Sharma calls ‘temporal architectures’. Temporal architectures, composed of elements including the built environment, commodities, services, technologies and labour, are infrastructures that enable social rhythms and temporal logics and that can entail a politicized valuing of the time of certain groups over others. We aim to contribute to an expanded and enriched conceptualisation of methods for exploring time, considering what our studies might offer to work on the doubled social life of time and methods, and highlighting in particular their implications for an engagement with a politics of time and temporality

An academic challenge to the entrepreneurial university: the spatial power of the ‘Slow Swimming Club’

© 2018 Society for Research into Higher Education. The entrepreneurial university is a vague notion that has evolved by applying the concepts of enterprise and entrepreneurship to a university context. The blurring of enterprise with entrepreneurship has allowed the entrepreneurial university to be increasingly underpinned by a managerialist discourse, typified by functionalisation and marketisation; culminating in academic disempowerment, dissatisfaction and subsequent disengagement. In response to such dissatisfaction, this paper reflects on a playful space, called the Slow Swimming Club (SSC), produced by several academics. The research takes a collective auto-ethnographic approach and employs Foucault’s heterotopology, as a conceptual frame, to understand the collective impact of this SSC entrepreneuring space. We relate the disconnection of the SSC to the process of critically connecting academics, back to their universities and consider whether such academic resistance, rooted in play, corporeal sensibility and emancipation, has the potential to enact social change and enhance entrepreneurial potential

Academic Arrhythmia: Disruption, Dissonance and Conflict in the Early-Career Rhythms of CMS Academics

Starting a career on the margins of the neoliberal business school is becoming increasingly challenging. We contribute to the understanding of the problems involved and to potential solutions by developing a theoretically-informed approach to the rhythms of academic life and drawing on interviews with 32 Critical Management Studies (CMS) early-career academics (ECAs) in 14 countries. Bringing together Lefebvre’s rhythmanalysis (and his concepts of polyrhythmia, eurhythmia and arrhythmia), Zerubavel’s sociology of time, and identity construction literature, we examine the rhythm-identity implications of the recent HE changes. We show how the dynamics between the broader pressures, institutional strategies, and our interviewees’ attempts to reassert themselves are creating a vicious circle of arrhythmia – a debilitating condition characterized by rhythmic disruption, dissonance and conflict. Within the circle, identity insecurity and regulation, CMS ECAs’ identity work, and arrhythmia are mutually co-constructive, so that it is hard for individuals to break out. We consider the possibilities and limitations of individual coping strategies and, drawing out lessons for business schools, advocate for more collective and structural solutions. In so doing, we contribute to the reimagining of business schools as more eurhythmically polyrhythmic places where ECAs of all intellectual orientations have the time to learn and develop

Prion protein is expressed on long-term repopulating hematopoietic stem cells and is important for their self-renewal

Although the wild-type prion protein (PrP) is abundant and widely expressed in various types of tissues and cells, its physiological function(s) remain unknown, and PrP knockout mice do not exhibit overt and undisputed phenotypes. Here we showed that PrP is expressed on the surface of several bone marrow cell populations successively enriched in long-term (LT) hematopoietic stem cells (HSCs) using flow cytometry analysis. Affinity purification of the PrP-positive and -negative fractions from these populations, followed by competitive bone marrow reconstitution assays, shows that all LT HSCs express PrP. HSCs from PrP-null bone marrow exhibited impaired self-renewal in serial transplantation of lethally irradiated mouse recipients both in the presence and absence of competitors. When treated with a cell cycle-specific myelotoxic agent, the animals reconstituted with PrP-null HSCs exhibit increased sensitivity to hematopoietic cell depletion. Ectopic expression of PrP in PrP-null bone marrow cells by retroviral infection rescued the defective hematopoietic engraftment during serial transplantation. Therefore, PrP is a marker for HSCs and supports their self-renewal

Hydrodynamic size distribution of fullerene particles in nC and C(OH) preparations

Shown are the volume distributions (each line is the average of at least twelve measurements per sample) of the nC water suspension (), and C(OH) in 10mM Nacl ().<p><b>Copyright information:</b></p><p>Taken from "Adverse effects of fullerenes on endothelial cells: Fullerenol C(OH) induced tissue factor and ICAM-1 membrane expression and apoptosis in vitro"</p><p></p><p>International Journal of Nanomedicine 2008;3(1):59-68.</p><p>Published online Jan 2008</p><p>PMCID:PMC2527653.</p><p>© 2008 Dove Medical Press Limited. All rights reserved</p