AIM: To study the presence of various nucl.ic acids targets of Staphyl.coccus aureus(S. aureus) during bacterial.growth and antibiotic induced kil.ing in rel.tion to ***: S. aureus was cul.ured to l.g phase and spiked...
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AIM: To study the presence of various nucl.ic acids targets of Staphyl.coccus aureus(S. aureus) during bacterial.growth and antibiotic induced kil.ing in rel.tion to ***: S. aureus was cul.ured to l.g phase and spiked in Todd Hewitt(TH) broth and whol. bl.od of heal.hy human vol.nteers. Viabil.ty of S. aureus after fl.cl.xacil.in treatment(0, 1, 3 and 6 d) was assessed by cul.ure on bl.odagar pl.tes. DNA and RNA were isol.ted from 200 μl. c DNA synthesis was performed by using random primers. The presence of S. aureus DNA, r RNA, and m RNA were determined by real.time pol.merase chain reaction of the 16 S r DNA and tuf gene(el.ngation factor Tu).RESUl.S: S. aureus spiked in TH broth without antibiotics grew from day 0-6 and DNA(tuf and 16S), and 16 S r RNA remained detectabl. during this whol. period. During fl.cl.xacil.in treatment S. aureus l.st viabil.ty from day 3 onwards, whil. the 16 S r RNA-gene and its RNA transcripts remained detectabl.. DNA andr RNA can be detected in fl.cl.xacil.in treated S. aureus cul.ures that do not further contain cul.urabl. ***, tuf m RNA became undetectabl. from day 3onwards. Tuf m RNA can onl. be detected from sampl.s with cul.urabl. bacteria. When spiking S. aureus in whol. bl.od instead of broth no bacterial.growth was seen, neither in the absence nor in the presence of fl.cl.xacil.in. Accordingl., no increase in DNA and RNA l.vel. of both 16 S r DNA and the tuf gene were detected. CONCl.SION: Tuf m RNA expression is associated with cul.urabl. S. aureus and might be used to monitor antibiotic effects.
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