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Dual-loaded chitosan-based nanoparticles: a novel approach for treating polymic...
Zegre, Miguel; Barros, J.; David, A. B.; Fialho, L.; Ferraz, M. P.; Monteiro, F. J.; Caetano, Liliana Aranha; Gonçalves, L.; Bettencourt, A.Developing innovative approaches to target osteomyelitis caused by polymicrobial infections remains a significant therapeutic challenge. In this study, monodispersed chitosan nanoparticles co-loaded with antibacterial (minocycline) and antifungal (voriconazole) agents were successfully prepared. Minocycline presented higher encapsulation efficiency as compared to voriconazole. Thermostability analysis suggested...
Poly(D,L-lactic acid) scaffolds as an innovative approach to the treatment of m...
Zegre, Miguel; Barros, J.; Ribeiro, I. A.; Santos, C.; Aranha Caetano, Liliana; Gonçalves, L.; Monteiro, F.; Ferraz, M.; Bettencourt, A.Introduction: The treatment of bacterial joint and bone infections in patients after multiple revision arthroplasties is very challenging. An expanding number of studies report the co-isolation of fungal and bacterial species (such as Candida albicans and Staphylococcus aureus) from polymicrobial biofilm associated with infections related to bone infections. Current investigations establish that local-specific ...
Poly(D,L-lactic acid) scaffolds as an innovative approach to the treatment of m...
Zegre, Miguel; Barros, J.; Ribeiro, I. A.; Santos, C.; Aranha Caetano, Liliana; Gonçalves, L.; Monteiro, F.; Ferraz, M.; Bettencourt, A.Problem - Bone infections associated with polymicrobial biofilm formation; mixed bacterial-fungal biofilm infection; Staphylococcus aureus and Candida albicans most described microbials. Strategy - Local drug delivery scaffolds; development of poly-DL-lactic acid (PDLLA) scaffolds; co-delivery of antibacterial and antifungal drugs; minocycline and voriconazole as model drugs.
Research progress on biodegradable polymeric platforms for targeting antibiotic...
Zegre, Miguel; Poljańska, E.; Caetano, Liliana Aranha; Gonçalves, L.; Bettencourt, A.The treatment of bone infections still involves systemic or local antibiotic therapy in high doses for prolonged periods. Current research focuses on the application of different drug delivery systems to the bone, aiming at a targeted local administration that will decrease the number of drugs used and their toxicity, compared to the systemic route. The gold standard in clinical practice is currently poly(methy...
Chitosan-based nanoparticles as a dual drug delivery system directed to bone in...
Falcão, J.; Zegre, Miguel; Bastron, S.; Ribeiro, I. A.; Gonçalves, L.; Bettencourt, A.Osteomyelitis treatment is usually described as a challenging issue, mainly because of the necessity of high levels of antimicrobials employed for extended periods, since the infection is characterized by poor blood circulation. Innovative options of targeted and controlled drug delivery systems, presenting sustained antimicrobial release, high concentrations of drugs in the infected areas, low concentrations i...
Chitosan nanoparticles loaded with minocycline targeting osteomyelitis
Zegre, Miguel; Bastron, S.; Ribeiro, I. A.; Caetano, Liliana Aranha; Gonçalves, L.; Bettencourt, A.Effective control of osteomyelitis (bone infection) with reduced toxicity is a current challenge. Targeted and controlled drug delivery systems allow: decreased toxicity, upgraded drug targeting, and improved therapeutic effect. Strategy: a) Innovative chitosan nanoparticulate system: nanoparticles loaded with minocycline (antibacterial), and alternative as a local delivery system; b) Nanoparticles and biofilms...
Poly(DL-lactic acid) scaffolds as a bone targeting platform for the co-delivery...
Zegre, Miguel; Barros, J.; Ribeiro, I. A.; Santos, C; Caetano, Liliana Aranha; Gonçalves, L.; Monteiro, F. J.; Ferraz, M. P.; Bettencourt, A.New strategies for the treatment of polymicrobial bone infections are required. In this study, the co-delivery of two antimicrobials by poly(D,L-lactic acid) (PDLLA) scaffolds was investigated in a polymicrobial biofilm model. PDLLA scaffolds were prepared by solvent casting/particulate leaching methodology, incorporating minocycline and voriconazole as clinically relevant antimicrobial agents. The scaffolds pr...
Co-delivery of antimicrobials based on poly(D,L-lactic acid) 3D-scaffolds
Zegre, Miguel; Falcão, M.; Ribeiro, I. A.; Santos, C.; Barros, J.; Monteiro, F. J.; Ferraz, M. P.; Caetano, Liliana Aranha; Gonçalves, L.Bone infection treatment is a clinical challenge, often complicated by simultaneous polymicrobial infections. A growing number of studies address the co-isolation of fungal and bacterial species, such as Candida albicans and Staphylococcus aureus, from polymicrobial biofilm associated with osteomyelitis. Recent publications demonstrate that scaffolds with local drug delivery ability, display high antimicrobial ...
Circulating microRNAs as potential biomarkers for genetic generalized epilepsie...
Martins‐Ferreira, R.; Chaves, J.; Carvalho, C.; Bettencourt, A.; Chorão, R.; Freitas, J.; Samões, R.; Boleixa, D.; Lopes, J.; Ramalheira, J.Background and purpose: Genetic generalized epilepsies (GGEs) encompass a group of syndromes of mainly genetic causes, characterized by the involvement of both hemispheres. MicroRNAs (miRNAs) are small non-coding RNAs with a critical role in the regulation of neuronal biological processes through gene expression modulation. Dysregulated miRNA expression has been shown in epilepsy. Due to their stability in biol...
Ustekinumab in Real-Life Practice: Experience in 116 Patients with Moderate-To-...
Raposo, I.; Bettencourt, A.; Leite, L.; Selores, M.; T, TorresUstekinumab is a monoclonal antibody directed against the p40 subunit common to both IL-12 and IL-23 cytokines. Although the evidence of ustekinumab efficacy and safety in clinical trials is extensively recognized, data on its use in clinical practice is limited. Our objective is to report on the real-life experience of two Portuguese dermatology departments with ustekinumab in patients with moderate to severe ...