The effects of anti-HIV nucleoside drugs on the virulence of clinically relevant candida species

Show simple item record Ahmadou, Ahidjo Bintou 2007-02-26T10:35:46Z 2007-02-26T10:35:46Z 2007-02-26T10:35:46Z
dc.description Student Number: 0420652W - MSc(Med) Dissertation - School of Pathology - Faculty of Health Sciences en
dc.description.abstract Candida species are opportunistic yeasts that cause infections in immunocompromised individuals such as HIV and cancer patients. Recent studies show that 5fluorouracil, a nucleoside analogue used for cancer treatment, increases Candida cell virulence. The aim of this study is to determine the effects of commonly used antiHIV nucleoside analogue drugs on the virulence of Candida albicans, the predominant species associated with oral candidiasis. Oral swabs were collected from antiretroviralnaïve HIVpositive individuals. C. albicans was characterised from 39 of these swabs using standard microbiological techniques and polymerase chain reaction. The effect of nucleoside reverse transcriptase inhibitors (NRTIs) zidovudine, stavudine, didanosine and lamivudine, at predicted drug peak concentrations in patients, as well as half and double these concentrations on select virulence factors of C. albicans isolates were studied. In addition, antifungal susceptibility to amphotericin B was assessed. Not all 39 isolates were used in the assays because of delays in obtaining reagents from respective manufacturers. Results show no change in the adherence and biofilm formation of 29 isolates upon exposure to NRTIs. In contrast, a steady increase in the number of viable cells was observed upon exposure to double the peak concentration of lamivudine to 23 of the clinical isolates. All 31 isolates tested were susceptible to amphotericin B (MIC£1mg/ml). Although these results suggest that NRTIs may have little effect on the virulence of C. albicans it is postulated, that, in a dosedependent manner, cytidine analogues act similarly to 5FU by activating a signaltransduction pathway which stimulates proliferation. en
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dc.language.iso en en
dc.subject Candida species en
dc.subject yeasts en
dc.subject immunocompromised individuals en
dc.subject HIV and cancer patients en
dc.subject antiHIV nucleoside analogue drugs en
dc.subject Candida albicans en
dc.title The effects of anti-HIV nucleoside drugs on the virulence of clinically relevant candida species en
dc.type Thesis en

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