RESUMO
BACKGROUND: The lysis-centrifugation system (Isolator system) is a technique with excellent results in the recovery of mycobacteria from blood specimens. This system consists mainly of saponin (SAP), polypropylenglycol (PPG), and sodium polianthol sulfonate (SPS). The objective of this work was to determine the effect of SAP, PPG, and SPS on the growth of Mycobacterium avium, M. kansasii, M. tuberculosis, and M. xenopi in fluid culture media MGIT and Septi-Chek AFB. METHODS: Two concentrations each of SAP, PPG, and SPS were prepared, and were added in 0.1 ml amounts (alone, in pairs and in combination) to fluid media MGIT and Septi-Chek AFB. Fluid culture media were then in individually inoculated with two different concentrations (10(3) and 10(5) CFU/ml) of each of the four mycobacterial strains used in this study. Culture media were incubated at 37 degrees C and were checked for growth daily. RESULTS: SAP, PPG, and SPS did not inhibit growth of mycobacteria but growth of these strains was indeed retarded (a lengthier time was required for detection of bacterial growth compared with the positive control). Final concentrations of SAP, PPG, and SPS which retarded mycobacterial growth varied, depending upon species, mycobacterial inoculum size, and fluid culture media used. CONCLUSIONS: Components included in the lysy-centrifugation system (SAP, PPG, and SPS), either alone or in combination retarded growth of M. avium, M. kansasii, M. tuberculosis, and M. xenopi in 10(3) and 10(5) CFU/ml concentrations in fluid culture media MGIT and Septi-Chek AFB. These results suggest that strategies should be adopted to decrease the concentrations of these three components, present in the sediment of the processed blood by the Isolator System, which eventually are going to be added to fluid media MGIT and Septi-Check AFB.
Assuntos
Técnicas Bacteriológicas/métodos , Mycobacterium/efeitos dos fármacos , Polianetolsulfonato/farmacologia , Propilenoglicol/farmacologia , Saponinas/farmacologia , Meios de Cultura/química , Meios de Cultura/farmacologia , Mycobacterium/crescimento & desenvolvimento , Mycobacterium avium/efeitos dos fármacos , Mycobacterium avium/crescimento & desenvolvimento , Mycobacterium kansasii/efeitos dos fármacos , Mycobacterium kansasii/crescimento & desenvolvimento , Mycobacterium xenopi/efeitos dos fármacos , Mycobacterium xenopi/crescimento & desenvolvimento , Micobactérias não Tuberculosas/crescimento & desenvolvimentoRESUMO
La inducción de coagulación intravascular diseminada (CID) o una reacción semejante a la CID por una sola inyección de una substancia polianiónica: polianetol sulfonato (Liquoid) produjo microtrombosis renal y pulmonar. Las concentraciones plasmáticas de fibronectina (Fn) disminuyeron en 63% (P 0.01) en los primeros 15 min. que siguieron a la inyección y se mantuvieron disminuídos por lo menos 90 min., sugiriendo que, in vivo, el polianión interviene en la coprecipitación del Fibrógeno-Fibronectina ya que cuando las concentraciones circulantes de Fn son bajas aumentan la localización de Fibrinógeno I125 en los riñones y pulmones después de inyectar liquoid. En la microvasculatura renal y pulmonar se encontraron trombos que contenían fibrinógeno, fibrina, Fn., y antígeno relacionado con el factor VIII (VIII ag). Los estudios de inmuno emborronamiento mostraron cantidades significativas de productos de degradación de la Fn. Los estudios "in vitro" sugieren que el liquoid altera la movilidad electroforética pero no la detección de la Fn por inmunodifusión. De esta manera la reacción semejante a CID inducida por el polianión agrega y secuestra Fn en los microtrombos y resulta en fragmentación molecular de ésta. Como la Fn es importante para la función retículoendotelial es razonable suponer que la reducción de su concentración y su degradación asociada con la CID puedan contribuir significativamente a las alteraciones histopatológicas mediadas por la coagulopatía de consumo