Factors accounting for psychosocial functioning in patients with low back pain

Low back pain (LBP) is a chronic disorder which exerts a profound impact on various spheres of psychosocial functioning, including emotional distress, functional limitations and decrements in social contacts. The objective of this study was to investigate the associations between the indices of psychosocial functioning in patients with chronic LBP and a range of psychological factors. Specifically, the study aimed at exploring the relative participation of personality, social support, disease-related cognitive appraisals and coping styles in accounting for the differences in psychosocial functioning of patients with LBP. One-hundred-twenty patients with LBP took part in the study and completed a battery of psychological questionnaires: NEO–Five Factors Inventory, Ways of Coping Questionnaire, Disease-Related Social Support Scale, Disease-Related Appraisals Scale and Psychosocial Functioning Questionnaire (PFQ). The PFQ dimensions were used as dependent variables in a series of stepwise regression analysis models with the scores from other questionnaires entered as independent variables. A cognitive appraisal of the disease in terms of an obstacle was strongly related to all domains of functioning; however, other appraisals (threat, challenge, harm, profit and overall disease importance) were uniquely associated with particular domains of functioning. Deprivation of social support was a significant predictor of distress experienced in interpersonal context and of sense of being disabled. Among basic personality traits, agreeableness was negatively associated with distress in interpersonal context, and conscientiousness was positively related to acceptance of life with the disease. Problem-focus coping was linked to higher acceptance of life with the disease. Among sociodemographic variables, older age and lower educational level were related to greater subjective feelings of being disabled. Pain severity was found unrelated to any of psychosocial functioning domains. Different aspects of psychosocial functioning are best accounted for by diverse patterns of psychological factors, which suggests involvement of different psychological mechanisms in development of LBP-related disability

Dose Dependent Side Effect of Superparamagnetic Iron Oxide Nanoparticle Labeling on Cell Motility in Two Fetal Stem Cell Populations

Multipotent stem cells (SCs) could substitute damaged cells and also rescue degeneration through the secretion of trophic factors able to activate the endogenous SC compartment. Therefore, fetal SCs, characterized by high proliferation rate and devoid of ethical concern, appear promising candidate, particularly for the treatment of neurodegenerative diseases. Super Paramagnetic Iron Oxide nanoparticles (SPIOn), routinely used for pre-clinical cell imaging and already approved for clinical practice, allow tracking of transplanted SCs and characterization of their fate within the host tissue, when combined with Magnetic Resonance Imaging (MRI). In this work we investigated how SPIOn could influence cell migration after internalization in two fetal SC populations: human amniotic fluid and chorial villi SCs were labeled with SPIOn and their motility was evaluated. We found that SPIOn loading significantly reduced SC movements without increasing production of Reactive Oxygen Species (ROS). Moreover, motility impairment was directly proportional to the amount of loaded SPIOn while a chemoattractant-induced recovery was obtained by increasing serum levels. Interestingly, the migration rate of SPIOn labeled cells was also significantly influenced by a degenerative surrounding. In conclusion, this work highlights how SPIOn labeling affects SC motility in vitro in a dose-dependent manner, shedding the light on an important parameter for the creation of clinical protocols. Establishment of an optimal SPIOn dose that enables both a good visualization of grafted cells by MRI and the physiological migration rate is a main step in order to maximize the effects of SC therapy in both animal models of neurodegeneration and clinical studies