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1.
Mater Sci Eng C Mater Biol Appl ; 128: 112306, 2021 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-34474857

RESUMO

Osteomyelitis is caused by Staphylococcus aureus (S. aureus), with associated progressive bone loss. This study developed for the first time a calcium phosphate cement (CPC) for delivery of doxycycline (DOX) and human platelet lysate (hPL) to fight against S. aureus infection and enhance the osteogenesis of human periodontal ligament stem cells (hPDLSCs). Chitosan-containing CPC scaffolds were fabricated in the absence (CPCC) or presence of DOX (CPCC+DOX). In addition, hPL was encapsulated in alginate microbeads and incorporated into CPCC+DOX (CPCC+DOX+ hPL). Flexural strength of CPCC+DOX + hPL was (5.56 ± 0.55) MPa, lower than (8.26 ± 1.6) MPa of CPCC+DOX (p < 0.05), but exceeding the reported strength of cancellous bone. CPCC+DOX and CPCC+DOX + hPL exhibited strong antibacterial activity against S. aureus, reducing biofilm CFU by 4 orders of magnitude. The hPDLSCs encapsulated in microbeads were co-cultured with the CPCs. The hPDLSCs were able to be released from the microbeads and showed a high proliferation rate, increasing by about 8 folds at 14 days for all groups. The hPL was released from the scaffold and promoted the osteogenic differentiation of hPDLSCs. ALP activity was 28.07 ± 5.15 mU/mg for CPCC+DOX + hPL, higher than 17.36 ± 2.37 mU/mg and 1.34 ± 0.37 mU/mg of CPCC+DOX and CPCC, respectively (p < 0.05). At 7 days, osteogenic genes (ALP, RUNX2, COL-1, and OPN) in CPCC+DOX + hPL were 3-10 folds those of control. The amount of hPDLSC-synthesized bone mineral with CPCC+DOX + hPL was 3.8 folds that of CPCC (p < 0.05). In summary, the novel CPC + DOX + hPL-hPDLSCs scaffold exhibited strong antibacterial activity, excellent cytocompatibility and hPDLSC osteogenic differentiation, showing a promising approach for treatment and prevention of bone infection and enhancement of bone regeneration.


Assuntos
Osteogênese , Ligamento Periodontal , Biofilmes , Fosfatos de Cálcio/farmacologia , Diferenciação Celular , Células Cultivadas , Humanos , Staphylococcus aureus , Células-Tronco
2.
J Int Med Res ; 46(6): 2338-2345, 2018 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-29633650

RESUMO

Objective The agranulocytosis-associated perianal infection (PI) rate ranges from 60% to 100% among patients with hematopoietic malignancies. In this study, we assessed the efficacy of a quality control circle (QCC) to minimize the PI rate. Methods Among 274 patients with severe immunodeficiency (agranulocytosis of ≥2 weeks) in our bone marrow transplantation center, the PI rate was 17.20%. A QCC was established following the 10 steps of the plan-do-check-act (PDCA) model; this was scientifically supported by culturing the bacterial colony from patients' perianal skin to determine the sanitization effect and interval time. Because a warm aqueous solution of potassium permanganate is recommended for sanitization, the bacterial colony culture was also used to determine the proper drug concentration, water temperature, and soaking time. All procedures were standardized. Patients, hospital staff, and medical students were enrolled into the QCC team based on the patient-hospital-student (PHS) win-win concept. Results After establishment of the PDCA model, the PI rate among 253 patients decreased from 17.20% to 5.93% and remained at 5.25% during the following year. The medical expenses and length of hospital stay consequently decreased. Conclusion The QCC and PHS win-win concept can reduce the PI rate and promote medical quality.


Assuntos
Agranulocitose/etiologia , Doenças do Ânus/prevenção & controle , Infecções Bacterianas/prevenção & controle , Transplante de Medula Óssea/efeitos adversos , Neoplasias Hematológicas/terapia , Participação nas Decisões/organização & administração , Equipe de Assistência ao Paciente/normas , Doenças do Ânus/etiologia , Doenças do Ânus/microbiologia , Infecções Bacterianas/etiologia , Infecções Bacterianas/microbiologia , Transplante de Medula Óssea/métodos , Hospitais , Humanos , Modelos Teóricos , Equipe de Assistência ao Paciente/organização & administração , Pacientes , Estudantes de Medicina
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