Rodier M.,French Institute of Health and Medical Research |
Rodier M.,University of Burgundy |
Rodier M.,University Hospital |
Prigent-Tessier A.,French Institute of Health and Medical Research |
And 11 more authors.
PLoS ONE | Year: 2014
Brain-derived neurotrophic factor (BDNF) through TrkB activation is central for brain functioning. Since the demonstration that plasmin is able to process pro-BDNF to mature BDNF and that these two forms have opposite effects on neuronal survival and plasticity, a particular attention has been paid to the link between tissue plasminogen activator (tPA)/plasmin system and BDNF metabolism. However, t-PA via its action on different N-methyl-D-aspartate (NMDA) receptor subunits is also considered as a neuromodulator of glutamatergic transmission. In this context, the aim of our study was to investigate the effect of recombinant (r)t-PA administration on brain BDNF metabolism in rats. In the hippocampus, we found that rt-PA (10 mg/kg) administration induced a progressive increase in mature BDNF levels associated with TrkB activation. In order to delineate the mechanistic involved, plasmin activity was assessed and its inhibition was attempted using tranexamic acid (30 or 300 mg/kg, i.v.) while NMDA receptors were antagonized with MK801 (0.3 or 3 mg/kg, i.p.) in combination with rt-PA treatment. Our results showed that despite a rise in rt-PA activity, rt-PA administration failed to increase hippocampal plasmin activity suggesting that the plasminogen/plasmin system is not involved whereas MK801 abrogated the augmentation in mature BDNF levels observed after rt-PA administration. All together, our results show that rt-PA administration induces increase in hippocampal mature BDNF expression and suggests that rt-PA contributes to the control of brain BDNF synthesis through a plasmin-independent potentiation of NMDA receptors signaling. © 2014 Rodier et al.
Bejot Y.,French Institute of Health and Medical Research |
Bejot Y.,University of Burgundy |
Bejot Y.,University Hospital |
Bejot Y.,Center dEpidemiologie des Populations |
And 14 more authors.
Neurochemistry International | Year: 2011
Although brain-derived neurotrophic factor (BDNF) plays a central role in recovery after cerebral ischemia, little is known about cells involved in BDNF production after stroke. The present study testes the hypothesis that neurons are not the unique source of neosynthesized BDNF after stroke and that non neuronal-BDNF producing cells differ according to the delay after stroke induction. For this purpose, cellular localization of BDNF and BDNF content of each hemisphere were analysed in parallel before and after (4 h, 24 h and 8 d) ischemic stroke in rats. Stroke of different severities was induced by embolization of the brain with variable number of calibrated microspheres allowing us to explore the association between BDNF production and neuronal death severity. The main results are that (a) unilateral stroke increased BDNF production in both hemispheres with a more intense and long-lasting effect in the lesioned hemisphere, (b) BDNF levels either of the lesioned or unlesioned hemispheres were not inversely correlated to neuronal death severity whatever the delay after stroke onset, (c) in the unlesioned hemisphere, stroke resulted in increased BDNF staining in neurons and ependymal cells (at 4 h and 24 h), (d) in the lesioned hemisphere, beside neurons and ependymal cells, microglial cells (at 24 h), endothelial cells of cerebral arterioles (at 4 h and 24 h) and astrocytes (at 8 d) exhibited a robust BDNF staining as well. Taken together, overall data suggest that non neuronal cells are able to produce substantial amount of BDNF after ischemic stroke and that more attention should be given to these cells in the design of strategies aimed at improving stroke recovery through BDNF-related mechanisms. © 2010 Elsevier Ltd All rights reserved.
Fromont A.,Service de Neurologie |
Fromont A.,Center dEpidemiologie des Populations |
Lehanneur M.-N.,Service de Protection Maternelle et Infantile PMI |
Rollot F.,French Institute of Health and Medical Research |
And 9 more authors.
Revue Neurologique | Year: 2014
Multiple sclerosis (MS) is one of the 30 chronic conditions specifically listed by the French healthcare system as a long-term disease (affections de longue durée [ALD]) for which the main health insurance fund (Caisse nationale d'assurance maladie des travailleurs salariés [CNAMTS]) provides full (100%) coverage of healthcare costs. The CNAMTS insures 87% of the French population (52,359,912 of the 60,028,292 inhabitants). The objectives of this study were to evaluate the direct and indirect medical costs of MS among the entire population insured by the CNAMTS in France in 2004. The CNAMTS provided us with access to the ALD database of patients with MS that contains different MS-related expenditures made in 2004. We calculated the overall direct and indirect cost of MS and the cost per patient and per item of expenditure. In 2004, 49,413 patients were registered on the ALD list for MS. Direct cost for MS patients was 469,719,967 €. The direct cost per patient and per year was 9,506 € with variations between regions (French administrative divisions) ranging from 10,800 € in northeastern France (Champagne-Ardenne) to 8,217 € in western France (Pays de la Loire). The different items of expenditure were treatments (44.5%), hospitalization (27.9%), nursing care (5.8%), physiotherapy (5.7%), transport (4%), biology (1.1%), and other (1.5%). During the course of the disease, the overall cost of MS increased slowly during the first 15 years (from 8,000 to 11,000 €), but dramatically the last year of life (23,410 €). The costs of immunomodulator treatments were higher during the first six years after registration on the ALD list. Conversely, physiotherapy costs increased linearly with time during the course of MS. Indirect costs were an estimated 116 million euros in 2004. A disability pension (8,918 € per patient) was perceived by 9,430 patients (19.1%) and a daily allowance (3,317 € per patient) by 9,894 patients (20%). In France, MS has an important economic impact, comparable to human immunodeficiency virus infection. © 2014 Elsevier Masson SAS. All rights reserved.