Mitochondrial DNA depletion in oocytes of HIV-infected antiretroviral-treated infertile women

Abstract

Background: HIV-infected women under highly active antiretroviral therapy (HAART) undergoing in vitro fertilization (lVF) have a lower pregnancy rate than non-infected controls, which depends on oocyte-related factors. We hypothesized that mitochondrial toxicity caused by antiretrovirals could be the underlying mechanism of such disturbance. Methods: We have studied 16 and 19 frozen-thawed oocytes obtained after oocyte retrieval IVF cycles from 8 and 14 infertile HIV-infected and uninfected women, respectively, matched by age. At inclusion, HIV-positive women had been infected for >13 years and had received HAART for >9 years, including at least one nucleoside reverse transcriptase inhibitor. All of them had undetectable HIV viral load and a good immunological status. Mitochondrial DNA (mtDNA) content was determined by quantitative real-time PCR in each individual oocyte. Results: HIV-infected infertile women on HAART showed significant oocyte mtDNA depletion when compared with uninfected controls (32% mtDNA decrease, P<0.05). This oocyte mtDNA depletion was even greater on those HIV-infected women who failed to become pregnant when compared with controls (39% mtDNA decrease, P=0.03). No significant correlation was found between mtDNA oocyte content and cumulative doses of antiretrovirals or the immunological status of HIV patients. Conclusions: Oocytes from infertile HIV-infected HAART-treated women show decreased mtDNA content, and this could explain their poor reproductive outcome. © 2008 International Medical Press.