Donepezil is an acetylcholinesterase inhibitor commonly used to treat mild to moderate Alzheimer’s disease. Its use has been associated with increased bone mass in humans and animals. However, the effect of postoperative administration of donepezil on bone healing remains unknown. Therefore, this study aimed to assess the impact of postoperative injection of donepezil on bone healing, titanium-implant osseointegration, and soft tissue healing. Twenty-two Sprague-Dawley rats were randomly assigned to receive a daily dose of either donepezil (0.6 mg/kg) or saline as a control. In each rat, a uni-cortical defect was created in the right tibia metaphysis and a custom-made titanium implant was placed in the left tibiae. After two weeks, rats were euthanized, and their bones were analysed by Micro-CT and histology. The healing of bone defect and implant osseointegration in the rats treated with donepezil were significantly reduced compared to the saline-treated rats. Histomorphometric analysis showed lower immune cell infiltration in bone defects treated with donepezil compared to the saline-treated defects. On the other hand, the healing time of soft tissue wounds was significantly shorter in donepezil-treated rats compared to the controls. In conclusion, short-term administration of donepezil hinders bone healing whereas enhancing soft tissue healing.
We examine a system of equations arising in biophysics whose solutions are believed to represent the stable positions of AE conical proteins embedded in a cell membrane. Symmetry considerations motivate two equivalent refomulations of the system which allow the complete classification of solutions for small AE ½¿. The occurrence of regular geometric patterns in these solutions suggests considering a simpler system, which leads to the detection of solutions for larger AE up to ¾ ¼. We use the most recent techniques of Gröbner bases computation for solving non linear systems.
Objectif : Les adolescents et jeunes adultes (AJA) atteints de cancer faisant face à la perte d’un autre AJA malade peuvent être confrontés à une « triple tâche » : le processus d’adolescence, l’ajustement psychologique au cancer et la mort d’un pair malade. L’objectif de l’étude a été d’explorer les processus sous-jacents à la perte d’un pair malade chez les AJA atteints de cancer.
Matériel et méthodes : Un entretien unique a été soumis à une Analyse phénoménologique interprétative (IPA), conçu pour comprendre le système de significations attaché à un phénomène subjectif et intime tel que le deuil.
Résultats : L’IPA a fait émerger six thèmes majeurs : le parcours de vie ; le parcours de soins ; les représentations du cancer, de soi et du monde ; l’ajustement psychologique au cancer ; les relations interpersonnelles ainsi que la perte d’un pair AJA malade. Le récit interprétatif montre la place centrale du processus d’identification aux pairs malades, notamment au défunt, dans la mise en sens du cancer et du deuil. Cette expérience du deuil d’un pair comporte des aspects négatifs (e.g., perspective de sa propre mort, perte de repère, peur de la rechute) et positifs (e.g., sentiment de continuité avec le défunt, changement de perception de soi et du monde).
Conclusion : L’étude montre l’importance de considérer ces processus dans l’accompagnement des AJA atteints de cancer confrontés à la mort d’un pair malade et de proposer des interventions adaptées à cette tranche d’âge.
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