Allergic sensitization: screening methods

Experimental in silico, in vitro, and rodent models for screening and predicting protein sensitizing potential are discussed, including whether there is evidence of new sensitizations and allergies since the introduction of genetically modified crops in 1996, the importance of linear versus conformational epitopes, and protein families that become allergens. Some common challenges for predicting protein sensitization are addressed: (a) exposure routes; (b) frequency and dose of exposure; (c) dose-response relationships; (d) role of digestion, food processing, and the food matrix; (e) role of infection; (f) role of the gut microbiota; (g) influence of the structure and physicochemical properties of the protein; and (h) the genetic background and physiology of consumers. The consensus view is that sensitization screening models are not yet validated to definitively predict the de novo sensitizing potential of a novel protein. However, they would be extremely useful in the discovery and research phases of understanding the mechanisms of food allergy development, and may prove fruitful to provide information regarding potential allergenicity risk assessment of future products on a case by case basis. These data and findings were presented at a 2012 international symposium in Prague organized by the Protein Allergenicity Technical Committee of the International Life Sciences Institute’s Health and Environmental Sciences Institute

Drug addiction

Drug addiction is a pervasive worldwide problem characterized by compulsive drug use that continues despite negative consequences and treatment attempts. Historically, the biological basis of drug addiction has focused principally on neuronal activity. However, despite their pivotal role in the underlying pathology of drug addiction, neurons are not the only central nervous system (CNS) component involved. The role of additional cell types, especially the CNS immunocompetent microglial cells, in the development of tolerance and related neuroplastic changes during drug taking, addiction, and withdrawal is also emerging. Within this perspective, this chapter reviews the roles of microglial cells in several aspects of drug addiction and its behavioural consequences, including reward, tolerance, dependence, and withdrawal. The cellular and molecular mechanisms which are particularly recruited will be emphasized. Lastly, we will also summarize the development of pharmacological modulators of microglial activation that offer novel treatment strategies and highlight the need to better understand the roles of microglia in the context of drug addiction.Xiaohui Wang, Thomas A. Cochran, Mark R. Hutchinson, Hang Yin, and Linda R. Watkin