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Original Article
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Volume 346:811-820 March 14, 2002 Number 11
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Changes in Mitochondrial DNA as a Marker of Nucleoside Toxicity in HIV-Infected Patients
Hélène C.F. Côté, Ph.D., Zabrina L. Brumme, B.S., Kevin J.P. Craib, M.Math., Christopher S. Alexander, Ph.D., Brian Wynhoven, B.S., Lillian Ting, B.S., Hubert Wong, Ph.D., Marianne Harris, M.D., P. Richard Harrigan, Ph.D., Michael V. O'Shaughnessy, Ph.D., and Julio S.G. Montaner, M.D.

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ABSTRACT

Background Nucleoside analogues can induce toxic effects on mitochondria by inhibiting the human DNA polymerase {gamma}. The toxic effects can range from increased serum lactate levels to potentially fatal lactic acidosis. We studied changes in mitochondrial DNA relative to nuclear DNA in the peripheral-blood cells of patients with symptomatic, nucleoside-induced hyperlactatemia.

Methods Total DNA was extracted from blood cells. A nuclear gene and a mitochondrial gene were quantified by real-time polymerase chain reaction. Three groups were studied: 24 controls not infected with the human immunodeficiency virus (HIV), 47 HIV-infected asymptomatic patients who had never been treated with antiretroviral drugs, and 8 HIV-infected patients who were receiving antiretroviral drugs and had symptomatic hyperlactatemia. The patients in the last group were studied longitudinally before, during, and after antiretroviral therapy.

Results Symptomatic hyperlactatemia was associated with marked reductions in the ratios of mitochondrial to nuclear DNA, which, during therapy, averaged 68 percent lower than those of non–HIV-infected controls and 43 percent lower than those of HIV-infected asymptomatic patients never treated with antiretroviral drugs. After the discontinuation of antiretroviral therapy, there was a statistically significant increase in the ratio of mitochondrial to nuclear DNA (P=0.02). In the patients followed longitudinally, the decline in mitochondrial DNA preceded the increase in venous lactate levels.

Conclusions Mitochondrial DNA levels are significantly decreased in patients with symptomatic, nucleoside-related hyperlactatemia, an effect that resolves on the discontinuation of therapy.


Source Information

From the British Columbia Centre for Excellence in HIV/AIDS (H.C.F.C., Z.L.B., K.J.P.C., C.S.A., B.W., L.T., M.H., P.R.H., M.V.O., J.S.G.M.) and the Canadian HIV Trials Network (H.W.), University of British Columbia, St. Paul's Hospital, Providence Health Care, Vancouver, B.C., Canada.

Address reprint requests to Dr. Montaner at St. Paul's Hospital, 667-1081 Burrard St., Vancouver, BC V6Z 1Y6, Canada, or at jmontaner{at}hivnet.ubc.ca.

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Related Letters:

Mitochondrial DNA and Nucleoside Toxicity
Chariot P., Bourokba N., Brivet F., Rastegar D. A., Casademont J., Miró O, Cardellach F., Montaner J. S.G., Coté H. C.F., Harrigan P. R.
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N Engl J Med 2002; 347:216-218, Jul 18, 2002. Correspondence

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