ABSTRACT
ObjectiveTo investigate the bactericidal effect of loaded multifunctional povidoneiodine-nanometer selenium （PVP-I@Se） disinfectant on Staphylococcus aureus （SA） and methicillin-resistant Staphylococcus aureus （MRSA）， and to provide an experimental basis for the reduction of surgical site infection （SSI）. MethodsThe control group was the povidone iodine （PVP-I） group with different concentrations of iodine （50， 75， 100， 200 and 400 μg/mL）. The PVP-I@Se group （experimental group） was the PVP-I group further supplemented with 2 μg/mL Selenium nanoparticles （SeNPs）. Then we compared the bactericidal effect of the two groups of disinfectant solutions on SA and MRSA by examining the minimum inhibitory concentration （MIC）， minimum bactericidal concentration （MBC）， the shortest sterilization time at a concentration of 50 μg/mL iodine and the inhibition zone diameters at concentrations of 200 μg/mL and 400 μg/mL iodine. ResultsMIC values of PVP-I against SA and MRSA were both 79.17 μg/mL， and those of PVP-I@Se were 54.17 and 70.83 μg/mL， respectively. MBC values of PVP-I against SA and MRSA were 129.17 and 150.00 μg/mL， respectively， and those of PVP-I@Se were 70.83 and 87.50 μg/mL， respectively. At a concentration of 50 μg/mL iodine， the shortest sterilization time of PVP-I for SA and MRSA was 130 s and 140 s， respectively， and that of PVP-I@Se was 65 s and 75 s， respectively. At a concentration of 200 μg/ml iodine， the inhibition zone diameters of PVP-I for SA and MRSA were 7.67 mm and 8.33 mm， and those of PVP-I@Se were both 9.50 mm. At a concentration of 400 μg/mL iodine， the inhibition zone diameters of PVP-I for SA and MRSA were 9.00 mm and 9.33 mm， and those of PVP-I@Se were 11.67 mm and 12.00 mm， respectively. ConclusionsPVP-I with different concentrations of 50， 75， 100， 200 and 400 μg/mL iodine supplemented with 2 μg/mL SeNPs have better and faster bactericidal effect on SA and MRSA. When combined with SeNPs， PVP-I can enhance the bactericidal activity against SA and MRSA， but with better sensitizing effect on SA than MRSA and higher demand of iodine concentration （400 μg/mL） for sensitizing effect on MRSA. This study provides a theoretical basis for selecting optimal concentration and action time of the disinfectant， thus reducing SSI.
ABSTRACT
ResumenLa telangiectasia hemorrágica hereditaria o síndrome de Rendu-Osler-Weber, es un desorden autonómico dominante, debido a mutaciones del gen de la endoglina o del gen de la cinasa análoga al receptor de activina. Dicha enfermedad se caracteriza por la presencia de telangiectasias en piel y mucosas, epistaxis recurrente y espontánea, además de malformaciones arteriovenosas en pulmones, cerebro y sistema gastrointestinal. Se ha reportado la asociación entre esta entidad e infecciones en diferentes sitios por Staphylococcus aureus. Los mecanismos de dicha predisposición incluyen la presencia de fístulas arteriovenosas y disfunción polimorfonuclear. Se reporta el caso de una paciente portadora de la enfermedad que asoció osteomielitis vertebral; requirió tratamiento antibiótico prolongado y cirugía de fusión e instrumentación de la columna vertebral a nivel torácico. Es necesario considerar este tipo de infecciones en pacientes con tal enfermedad, lo cual puede ayudar a la escogencia del tratamiento antibiótico y del manejo del paciente más expedito.
AbstractHereditary Hemorrhagic Telangiectasia or Osler-Weber-Rendu syndrome is a dominant autonomic disorder caused by mutations of the endoglin gene or the kinase gene similar to the activin receptor. This disease is characterized by the presence of telangiectasia on skin and mucous, recurrent and spontaneous epistaxis, as well as arteriovenous malformations in lungs, brain and gastrointestinal system. The association between this disease and infections in several places of the body with Staphylococcus aureushas been reported. The mechanisms of this predisposition include the presence of arteriovenous fistulas and polymorphonuclear dysfunction. A case is reported about a patient carrying the disease associated with vertebral osteomyelitis, who required a prolonged antibiotic treatment and instrumentation of the vertebral column at thoracic level. It is necessary to consider this type of infections in patients with this disease, which may help when choosing the antibiotic treatment and a more expeditious patient management.
Subject(s)
Humans , Discitis , Staphylococcus aureus , Telangiectasia, Hereditary Hemorrhagic/complicationsABSTRACT
Objective To investigate the effect of vitamin D (VD) on macrophage to phagocytize Staphylococcus aureus (SA). Method Macrophoge cell lines RAW264.7 were allocated into 3 groups:control group(C),bacterium group(B),active vitamin D+ bacterium group (VD+B). Cells in the VD+B group were incubated with 10-8mol/L active vitamin D for 24h,then cells in the VD+B group and the B group were cultured with SA for 1h,and phagocytosis rate,mitochondrial membrane potential,[Ca～(2+)]i,reactive oxygen species were determined by flow cytometry (FCM). Results The phagocytizing activity of macrophage in VD+B group was significantly higher than that in B group 1h after infection,At the same time,the mitochondrial member potential and [Ca～(2+)]i of macrophage in VD+B group were distinctly lower than that in B group; but reactive oxygen species of macrophage in the VD+B group was insignificantly different from B group. Conclusion Vitamin D can reinforce the phagocytizing activity of macrophage and inhibit the apoptosis of macrophage after phagocytize Staphylococrcus aureus.