Selectivity of the photosensitiser Tookad® for photodynamic therapy evaluated in the Syrian golden hamster cheek pouch tumour model

The response to photodynamic therapy (PDT) with the photosensitiser (PS) Tookad was measured in the Syrian hamster cheek pouch model on normal mucosae and chemically induced squamous cell carcinoma. This PS is a palladium-bacteriopheophorbide presenting absorption peaks at 538 and 762 nm. The light dose, drug dose and drug injection-light irradiation times (DLI), ranging between 100 and 300 J cm(-2), 1-5 mg kg(-1) and 10-240 min respectively, were varied and the response to PDT was analysed by staging the macroscopic response and by the histological examination of the sections of the irradiated cheek pouch. A fast time decay of the tissular response with drug dose of 1-5 mg kg(-1) was observed for DLI ranging from 10 to 240 min and for light doses of 100-300 J cm(-2) delivered at a light dose rate of 150 mW cm(-2). A significantly higher level of tissular response was observed for squamous cell carcinoma compared to normal tissue. Nevertheless, the threshold level of the drug-light dose for a detectable response was not significantly different in the tumoral vs normal tissue. The highest response at the shortest DLIs and the absence of measurable response at DLI larger than 240 min at light dose of 300 J cm(-2) and drug dose of 5 mg kg(-1) reveals the predominantly vascular effect of Tookad. This observation suggests that Tookad could be effective in PDT of vascularised lesions

Uptake and localisation of mTHPC (Foscan®) and its14C-labelled form in normal and tumour tissues of the hamster squamous cell carcinoma model: a comparative study

The aim of this study was to evaluate the pharmacokinetics of meta(tetrahydroxyphenyl)chlorin (mTHPC) on different tissues of interest in a hamster tumour model and to confirm our earlier animal studies on semi-quantitative fluorescence microscopy. The results obtained by three different evaluation methods were compared: in vivo spectrofluorometry, ex vivo fluorescence microscopy and chemical extraction of 14C-labelled mTHPC. Following intracardiac injection of 0.5 mg kg−1 mTHPC, groups of five tumour-bearing animals were used for in situ light-induced fluorescence spectroscopy. Afterwards, the biopsies were taken and snap frozen for fluorescence microscopy. The presence of radioactivity in serum and tissues was determined after chemical digestion in scintillation fluid using a scintillation counter. For each analysed tissue, a good correlation was observed between the three evaluation methods. The highest fluorescence intensity and quantities of mTHPC were observed between 12 and 24 h in liver, kidney, serum, vascular endothelium and advanced neoplasia. The majority of mTHPC was found at around 48 h in smooth muscle and at 96 h in healthy cheek pouch mucosa and early malignant lesions. The lowest level of mTHPC was noted in striated muscle at all times. No selectivity in dye localisation was observed between early squamous cell carcinoma and healthy mucosa. Soon after the injection, a significant selectivity was noted for advanced squamous cell carcinoma as compared to healthy cheek pouch mucosa or striated muscle. A significant difference in mTHPC localisation and quantity was also observed between striated and smooth muscle during the first 48 h following the injection. Finally, this study demonstrated the usefulness of non-invasive in situ spectroscopic measurements to be performed systematically prior to photodynamic therapy as a real-time monitoring for each treated patient in order to individualise and adapt the light dosimetry and avoid over or under treatments

Little angels: The mediation of parenting

This Article does not have an abstract

A song and dance: branded entertainment and mobile promotion

This article considers the rise of branded entertainment within the contemporary marketing and media environment. Specifically, it examines how mobile phone marketing in the UK has sought to engage consumers and perform the social use of mobile technology through multimedia ad campaigns with an inscribed entertainment value. Focusing on brand campaigns for 3G mobile services that borrow explicitly from reality television (T-Mobile) and Hollywood film (Orange), the article explores the concept of branded entertainment in relation to the ‘popular imagination’ of mobile communication in the late 2000s. In doing so, it examines the particular relation of flash mobs to the production of brand community

Cloaked Facebook pages: Exploring fake Islamist propaganda in social media

This research analyses cloaked Facebook pages that are created to spread political propaganda by cloaking a user profile and imitating the identity of a political opponent in order to spark hateful and aggressive reactions. This inquiry is pursued through a multi-sited online ethnographic case study of Danish Facebook pages disguised as radical Islamist pages, which provoked racist and anti-Muslim reactions as well as negative sentiments towards refugees and immigrants in Denmark in general. Drawing on Jessie Daniels’ critical insights into cloaked websites, this research furthermore analyses the epistemological, methodological and conceptual challenges of online propaganda. It enhances our understanding of disinformation and propaganda in an increasingly interactive social media environment and contributes to a critical inquiry into social media and subversive politics

Contested Visions: Digital Discourses as Empty Signifiers from the ‘Network’ to ‘Big Data’

This paper engages with two key concepts that define our digital cultures: the ‘network’ and ‘big data’. It critically considers how these concepts are often framed by techno-utopian or techno-dystopian political understandings of historical transformation. In the last years, the relationship between technological discourses and political visions, has lead to the emergence of critical research in the field (Mosco, 2004; Hindeman, 2010; Morozov, 2011, 2013). This research has shown that we cannot fully understand digital discourses without considering the very Western belief that technological innovation necessarily leads to new political possibilities. By drawing on the findings of a cross-cultural ethnographic research amongst three different political groups in Europe, this paper argues that current research in the field has focused too long on how digital discourse is shaped by Western meta-narratives of technological progress. This is to detriment to a careful consideration of the fact that different political actors discorsively construct digital technologies with reference to different political visions. Understanding these contested visions, the paper will show, is of central importance as it could enable us to appreciate that digital discourses have become today ‘empty signifiers’ (Laclau, 1996), which define the basis of contemporary hegemonic struggles

History and Class Consciousness 2.0: Georg Lukács in the age of digital capitalism and big data

This paper discusses the relevance of Georg Lukács’ 1923 book History and Class Consciousness in the context of digital capitalism. It does so by analysing how Lukács’ concepts of the dialectic of subject and object, ideology, reification, reified consciousness matter today in the context of big data and digital capitalism. The essay shows that History and Class Consciousness’ critique of reification, ideology, and reified consciousness remains highly topical in the age of digital capitalism and big data. Lukács’ analysis allows us to critically analyse how social media, big data, and various other Internet technologies are used as tools of reification. At the same time, Lukács reminds us that only human praxis can establish alternatives

I feel your pain: Celebrity do-gooding, cosmopolitan caring and the globalised soul

Offering support for global charities has become practically part of the contemporary celebrity job description and a hallmark of the established star. Locating the expansion of this phenomenon within the post-Fordist cultural turn, this paper explores how public displays of support for “the afflicted” can be a way for celebrities to appear to raise their profile above the zone of the crudely commercial into the sanctified, quasi-religious realm of altruism and charity, whilst revealing or constructing an added dimension of personality: of compassion and caring. The paper suggests that investigating the communicative cultural flows circulating between the celebrity, their impoverished “Others” and the non-destitute, non-celebrity “ordinary” subject can tell us something both about how such power relationships are maintained and how the possibilities of change to global injustices are imagined or disavowed. To theorise these interconnections, the paper links together conceptions of the social power of celebrity with debates around cosmopolitanism, work on the mediation of distant suffering and Nietzsche's conception of “the soul”

‘I just think it’s dirty and lazy’: Fat surveillance and erotic capital

Contextualised within the UK mediascape, this article discusses how fat signifies the classed failures of neoliberalism. Because class aspiration, entrepreneurialism and the myth of the competitive individual are pivotal to the political economy of neoliberalism, fat is increasingly and vehemently vilified as abject across media platforms. Fat-surveillance media, which are marketed specifically to women by their visuals, gendered community, language, and structures of feeling, participate in a ‘gynaeopticon’ where the controlling gaze is female, and the many women regulate the many women. Rather than being a top-down form of governance and discipline such as in the panopticon, control is affectively devolved among systems or networks of the policing gaze. As well as monitoring women along the lines of class, I argue that these media circumscribe the de-individualising possibilities and passions of the libido

Data & Agency

This introduction to the special issue on data and agency argues that datafication should not only be understood as the process of collecting and analysing data about Internet users, but also as feeding such data back to users, enabling them to orient themselves in the world. It is important that debates about data power recognise that data is also generated, collected and analysed by alternative actors, enhancing rather than undermining the agency of the public. Developing this argument, we first make clear why and how the question of agency should be central to our engagement with data. Subsequently, we discuss how this question has been operationalized in the five contributions to this special issue, which empirically open up the study of alternative forms of datafication. Building on these contributions, we conclude that as data acquire new power, it is vital to explore the space for citizen agency in relation to data structures and to examine the practices of data work, as well as the people involved in these practices