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Recommendations for Use of Antiretroviral Drugs in Pregnant HIV-1-Infected Women for Maternal Health and Interventions to Reduce Perinatal HIV Transmission in the United States
Long-Term Follow-Up of Antiretroviral Drug-Exposed Infants
(Last updated: August 6, 2015; last reviewed: August 6, 2015)
Children with in utero/neonatal exposure to antiretroviral drugs who develop significant organ system abnormalities of unknown etiology, particularly of the nervous system or heart, should be evaluated for potential mitochondrial dysfunction (CIII).
Rating of Recommendations: A = Strong; B = Moderate; C = Optional Rating of Evidence: I = One or more randomized trials with clinical outcomes and/or validated laboratory endpoints; II = One or more well-designed, nonrandomized trials or observational cohort studies with long-term clinical outcomes; III = Expert opinion
Data remain insufficient to address the effect that exposure to zidovudine or other antiretroviral (ARV) agents in utero might have on long-term risk of neoplasia or organ system toxicities in children; however, the balance of evidence over 2 decades is reassuring. Potential toxicities require further, long-term investigation especially as individual antenatal ARV and ARV combinations continue to evolve. Initial data from follow-up of PACTG 076 infants through age 6 years did not indicate any differences in immunologic, neurologic, and growth parameters between infants who were exposed to the zidovudine regimen and those who received placebo, and no malignancies were noted.1,2 However, concerns remain that exposure to ARVs may have long-term effects on mitochondrial and immunologic function. Ongoing studies within the Pediatric HIV/AIDS Cohort Study (PHACS) and other HIV-exposed uninfected cohorts may help to identify the long-term risks of ARVs in exposed infants.
Potential Mitochondrial Toxicity
Nucleoside reverse transcriptase inhibitor (NRTI) drugs induce some degree of mitochondrial dysfunction reflecting varying affinity for mitochondrial gamma DNA polymerase. This affinity can interfere with mitochondrial replication, resulting in mitochondrial DNA (mt DNA) depletion and dysfunction.3-5 Aberrant histological morphology of mitochondria, mt DNA mutations, alterations in mt DNA levels in cord blood mononuclear cells, and even aneuploidy in cord blood cells have all been described in both non-human primates and neonates exposed in utero to NRTIs.6-9 Reported increased and decreased alterations in mt DNA levels add further complexity to interpretation of their clinical significance; in addition, the data may be confounded by stage of maternal HIV infection and differences in laboratory assays and cell lines used.8,10-12 One study has reported that respiratory chain mitochondrial function is subtly perturbed, at least transiently, with an increased incidence of abnormal newborn metabolic screen results for products of intermediary metabolism (elevated amino acids and acylcarnitines) in HIV-exposed (but uninfected) infants compared with HIV-unexposed infants.13 The degrees to which these theoretical concerns and even documented mitochondrial abnormalities are clinically relevant are not yet known but are significantly outweighed by the robust, proven efficacy of maternal and infant ARV prophylaxis to prevent perinatal HIV transmission.8,14
Evidence of clinically apparent effects of mitochondrial toxicity is also conflicting. A low rate of hyperlactatemia (3.4%) is documented among HIV-exposed, uninfected infants born to US women receiving ARV therapy.15 However, earlier studies from the French Perinatal Study Group cohort noted a significantly increased incidence of clinical effects possibly reflecting mitochondrial dysfunction including seizures, cognitive and motor delays, abnormal neuroimaging, hyperlactatemia, cardiac dysfunction, and two deaths, with abnormal mitochondrial histology noted among some HIV-uninfected infants born to HIV-infected women (who received or did not receive ARV drugs during pregnancy: 12/2,644 vs. 0/1,748, respectively, P = 0.002).16,17 Further clinical studies from the United States and Europe have not duplicated these French reports.18-24 In a report from a long-term follow-up study in the United States (PACTG 219/219C), 20 children with possible symptoms of mitochondrial dysfunction were identified among a cohort of 1,037 HIV-exposed uninfected infants.23 Definitive diagnosis was not possible because none of the children had biopsies for mitochondrial function; however, 3 of the 20 children had no exposure to ARV drugs. In the 17 remaining children, there was an association between symptoms and first exposure to zidovudine/lamivudine limited to the third trimester, but overall exposure to NRTIs was not associated with symptoms. Some small alterations in mt DNA and oxidative phosphorylation enzyme activities were documented in stored specimens from these children, but the clinical significance of these observations remains unknown.25,26
Given the above data, mitochondrial dysfunction should be considered in uninfected children with perinatal exposure to ARV drugs who present with severe clinical findings of unknown etiology, particularly neurologic findings. It is important that the long-term medical record of an uninfected child includes information about ARV exposure, should unusual symptoms develop later in life, or if adverse late effects of HIV or ARV exposure in uninfected children are identified in the future.8,27,28
Potential Immunologic Dysfunction
The potential impact of HIV exposure on the immune system of an uninfected infant is unclear. One study reported lower CD4 T lymphocyte (CD4) cell counts in HIV-exposed uninfected infants born to mothers whose viral load at the time of delivery was >1,000 copies/mL compared to HIV-exposed uninfected infants whose mothers had a viral load <50 copies/mL at the time of delivery.29 The French Perinatal Cohort Group have reported an increased risk of serious bacterial infections with encapsulated organisms in HIV-exposed infants born to mothers with low CD4 number near the time of delivery.30 Other data suggest that exposure to HIV in utero may be associated with alterations in CD4 and CD8 cell-mediated immune responses in infants to vaccines and non-specific antigens in infants.31 Further study is needed regarding the reproducibility of these data, whether findings are transient or prolonged, and whether they are primarily associated with advanced maternal HIV disease.
Ongoing evaluations of the early and late effects of in utero exposure to ARV drugs include the Pediatric HIV/AIDS Cohort Study Surveillance Monitoring of Antiretroviral Toxicity Study, natural history studies, and HIV/AIDS surveillance conducted by state health departments and the Centers for Disease Control and Prevention. Because many of the available follow-up data to date relate to in utero exposure to antenatal zidovudine or other NRTIs alone, and most HIV-infected pregnant women currently receive combination ARV drug regimens, it is critical that studies to evaluate potential adverse effects of in utero drug exposure continue to be supported. HIV surveillance databases from states that require HIV reporting provide an opportunity to collect population-based information concerning in utero exposure to ARVs. To the extent permitted by federal law and regulations, data from these confidential registries can be compared with information from birth defect and cancer registries to identify potential adverse outcomes.
Culnane M, Fowler M, Lee SS, et al. Lack of long-term effects of in utero exposure to zidovudine among uninfected children born to HIV-infected women. Pediatric AIDS Clinical Trials Group Protocol 219/076 Teams. JAMA. 1999;281(2):151-157. Available at http://www.ncbi.nlm.nih.gov/pubmed/9917118.
Hanson IC, Antonelli TA, Sperling RS, et al. Lack of tumors in infants with perinatal HIV-1 exposure and fetal/neonatal exposure to zidovudine. J Acquir Immune Defic Syndr Hum Retrovirol. 1999;20(5):463-467. Available at http://www.ncbi.nlm.nih.gov/pubmed/10225228.
Brinkman K, Ter Hofstede HJM, Burger DM, et al. Adverse effects of reverse transcriptase inhibitors: mitochondrial toxicity as common pathway. AIDS. 1998;12(14):1735-1744. Available at http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=9792373&dopt=Abstract.
Birkus G, Hitchcock MJ, Cihlar T. Assessment of mitochondrial toxicity in human cells treated with tenofovir: comparison with other nucleoside reverse transcriptase inhibitors. Antimicrob Agents Chemother. 2002;46(3):716-723. Available at http://www.ncbi.nlm.nih.gov/pubmed/11850253.
Saitoh A, Haas RH, Naviaux RK, Salva NG, Wong JK, Spector SA. Impact of nucleoside reverse transcriptase inhibitors on mitochondrial DNA and RNA in human skeletal muscle cells. Antimicrob Agents Chemother. 2008;52(8):2825-2830. Available at http://www.ncbi.nlm.nih.gov/pubmed/18541728.
Divi RL, Leonard SL, Kuo MM, et al. Transplacentally exposed human and monkey newborn infants show similar evidence of nucleoside reverse transcriptase inhibitor-induced mitochondrial toxicity. Environ Mol Mutagen. 2007;48(3-4):201-209. Available at http://www.ncbi.nlm.nih.gov/pubmed/16538687.
Poirier MC, Divi RL, Al-Harthi L, et al. Long-term mitochondrial toxicity in HIV-uninfected infants born to HIV-infected mothers. J Acquir Immune Defic Syndr. 2003;33(2):175-183. Available at http://www.ncbi.nlm.nih.gov/pubmed/12794551.
Jao J, Abrams EJ. Metabolic Complications of in utero Maternal HIV and Antiretroviral Exposure in HIV-exposed Infants. Pediatr Infect Dis J. 2014;33(7):734-740. Available at http://www.ncbi.nlm.nih.gov/pubmed/24378947.
Martin F, Taylor GP. The safety of highly active antiretroviral therapy for the HIV-positive pregnant mother and her baby: is 'the more the merrier'? J Antimicrob Chemother. 2009;64(5):895-900. Available at http://www.ncbi.nlm.nih.gov/pubmed/19706669.
Aldrovandi GM, Chu C, Shearer WT, et al. Antiretroviral exposure and lymphocyte mtDNA content among uninfected infants of HIV-1-infected women. Pediatrics. 2009;124(6):e1189-1197. Available at http://www.ncbi.nlm.nih.gov/pubmed/19933732.
Cote HC, Raboud J, Bitnun A, et al. Perinatal exposure to antiretroviral therapy is associated with increased blood mitochondrial DNA levels and decreased mitochondrial gene expression in infants. J Infect Dis. 2008;198(6):851-859. Available at http://www.ncbi.nlm.nih.gov/pubmed/18684095.
Gingelmaier A, Grubert TA, Kost BP, et al. Mitochondrial toxicity in HIV type-1-exposed pregnancies in the era of highly active antiretroviral therapy. Antivir Ther. 2009;14(3):331-338. Available at http://www.ncbi.nlm.nih.gov/pubmed/19474467.
Kirmse B, Hobbs CV, Peter I, et al. Abnormal newborn screens and acylcarnitines in HIV-exposed and ARV-exposed infants. Pediatr Infect Dis J. 2013;32(2):146-150. Available at http://www.ncbi.nlm.nih.gov/pubmed/22935866.
Newell ML, Bunders MJ. Safety of antiretroviral drugs in pregnancy and breastfeeding for mother and child. Curr Opin HIV AIDS. 2013;8(5):504-510. Available at http://www.ncbi.nlm.nih.gov/pubmed/23743789.
Crain MJ, Williams PL, Griner R, et al. Point-of-care capillary blood lactate measurements in human immunodeficiency virus-uninfected children with in utero exposure to human immunodeficiency virus and antiretroviral medications. Pediatr Infect Dis J. 2011;30(12):1069-1074. Available at http://www.ncbi.nlm.nih.gov/pubmed/22051859.
Blanche S, Tardieu M, Rustin P, et al. Persistent mitochondrial dysfunction and perinatal exposure to antiretroviral nucleoside analogues. Lancet. 1999;354(9184):1084-1089. Available at http://www.ncbi.nlm.nih.gov/pubmed/10509500.
Barret B, Tardieu M, Rustin P, et al. Persistent mitochondrial dysfunction in HIV-1-exposed but uninfected infants: clinical screening in a large prospective cohort. AIDS. 2003;17(12):1769-1785. Available at http://www.ncbi.nlm.nih.gov/pubmed/12891063.
Sperling RS, Shapiro DE, McSherry GD, et al. Safety of the maternal-infant zidovudine regimen utilized in the Pediatric AIDS Clinical Trial Group 076 Study. AIDS. 1998;12(14):1805-1813. Available at http://www.ncbi.nlm.nih.gov/pubmed/9792381.
The Perinatal Safety Review Working Group. Nucleoside exposure in the children of HIV-infected women receiving antiretroviral drugs: absence of clear evidence for mitochondrial disease in children who died before 5 years of age in five United States cohorts. J Acquir Immune Defic Syndr. 2000;25(3):261-268. Available at http://www.ncbi.nlm.nih.gov/pubmed/11115957.
Lipshultz SE, Easley KA, Orav EJ, et al. Absence of cardiac toxicity of zidovudine in infants. Pediatric Pulmonary and Cardiac Complications of Vertically Transmitted HIV Infection Study Group. N Engl J Med. 2000;343(11):759-766. Available at http://www.ncbi.nlm.nih.gov/pubmed/10984563.
European Collaborative Study. Exposure to antiretroviral therapy in utero or early life: the health of uninfected children born to HIV-infected women. J Acquir Immune Defic Syndr. 2003;32(4):380-387. Available at http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12640195&dopt=Abstract.
Alimenti A, Forbes JC, Oberlander TF, et al. A prospective controlled study of neurodevelopment in HIV-uninfected children exposed to combination antiretroviral drugs in pregnancy. Pediatrics. 2006;118(4):e1139-1145. Available at http://www.ncbi.nlm.nih.gov/pubmed/16940166.
Brogly SB, Ylitalo N, Mofenson LM, et al. In utero nucleoside reverse transcriptase inhibitor exposure and signs of possible mitochondrial dysfunction in HIV-uninfected children. AIDS. 2007;21(8):929-938. Available at http://www.ncbi.nlm.nih.gov/pubmed/17457086.
Hankin C, Lyall H, Peckham C, Tookey P. Monitoring death and cancer in children born to HIV-infected women in England and Wales: use of HIV surveillance and national routine data. AIDS. 2007;21(7):867-869. Available at http://www.ncbi.nlm.nih.gov/pubmed/17415042.
Brogly SB, DiMauro S, Van Dyke RB, et al. Short communication: transplacental nucleoside analogue exposure and mitochondrial parameters in HIV-uninfected children. AIDS Res Hum Retroviruses. 2011;27(7):777-783. Available at http://www.ncbi.nlm.nih.gov/pubmed/21142587.
Brogly SB, Foca M, Deville JG, et al. Potential confounding of the association between exposure to nucleoside analogues and mitochondrial dysfunction in HIV-uninfected and indeterminate infants. J Acquir Immune Defic Syndr. 2010;53(1):154-157. Available at http://www.ncbi.nlm.nih.gov/pubmed/20035168.
Mofenson LM, Watts DH. Safety of pediatric HIV elimination: the growing population of HIV- and antiretroviral-exposed but uninfected infants. PLoS Med. 2014;11(4):e1001636. Available at http://www.ncbi.nlm.nih.gov/pubmed/24781352.
Hazra R, Siberry GK, Mofenson LM. Growing up with HIV: children, adolescents, and young adults with perinatally acquired HIV infection. Annu Rev Med. 2010;61:169-185. Available at http://www.ncbi.nlm.nih.gov/pubmed/19622036.
Kakkar F, Lamarre V, Ducruet T, et al. Impact of maternal HIV-1 viremia on lymphocyte subsets among HIV-exposed uninfected infants: protective mechanism or immunodeficiency. BMC Infect Dis. 2014;14:236. Available at http://www.ncbi.nlm.nih.gov/pubmed/24885498.
Taron-Brocard C, Le Chenadec J, Faye A, et al. Increased risk of serious bacterial infections due to maternal immunosuppression in HIV-exposed uninfected infants in a European country. Clin Infect Dis. 2014;59(9):1332-1345. Available at http://www.ncbi.nlm.nih.gov/pubmed/25053719.
Kidzeru EB, Hesseling AC, Passmore JA, et al. In-utero exposure to maternal HIV infection alters T-cell immune responses to vaccination in HIV-uninfected infants. AIDS. 2014;28(10):1421-1430. Available at http://www.ncbi.nlm.nih.gov/pubmed/24785950.