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Clinical implications of discordant viral and immune outcomes following protease inhibitor containing antiretroviral therapy for HIV-infected children

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Abstract

Many HIV-infected children treated with protease inhibitors (PI) reconstitute immunity despite viral breakthrough predicting disease progression. We studied a unique cohort of PI treated children with advanced disease who demonstrated sustained CD4 T cell counts but median post therapy viral load rebounded to >4.0 log10 copies/ml. Phylogenetic relationships between pre- and post-therapy viruses reveals significant bottlenecks for quasispecies with natural polymorphisms mapping outside of protease active site providing selective advantage for emergence. Among discordant subjects post-therapy viruses fell into two phenotypes; high viral loads (median >5.0 log10 copies/ml) and attenuated post-therapy replication (median <4.0 log10 copies/ml). Both groups showed similar degrees of CD4 T cell immune reconstitution and were similar to children who optimally suppressed virus to <400 copies/ml. Both high fit and low fit discordant response groups showed high reconstitution of naïve CD4 CD45RA T cells (median 388 and 357 cells/μl, respectively). Naïve T cells increases suggest virus replicating under PI selective pressure do not impair thymic output. If therapeutic options are limited, selection of therapy which allows immune reconstitution despite suboptimal viral control may be beneficial. This novel paradigm for virus/host interactions may lead to therapeutic approaches to attenuate viral pathogenesis.

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Acknowledgments

Research was supported in part by PHS R01 awards HD032259, AI065265, AI028571, and AI047723; Center for Research for Pediatric Immune Deficiency; Laura McClamma Fellowship, Graduate Alumni Fellowship (SKH), and Stephany W. Holloway University Chair for AIDS Research (MMG); Pediatric Clinical Research Center of All Children’s Hospital and the University of South Florida, and the Maternal Child Health Bureau, R60 MC 00003-01, Department of Health and Human Services, Resources and Services Administration.

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Correspondence to John W. Sleasman.

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Dedication to Dr. Robert A. Good: In many ways the HIV epidemic has defined modern human immunology. Early in the epidemic there was no readily available animal model to study pathogenesis. As a result physicians had to rely on clinical observations to understand disease progression and the factors leading to the development of AIDS. Imagine if Dr. Good’s early work in defining the compartmentalization of adaptive immunity into T and B lymphocytes or his discovery of the important role of the thymus in T cell development had NOT occurred or happened years later? There would have been confusion and frustration in understanding, treating, and controlling this great new plague of mankind. Fortunately Dr. Good’s focus on human immunology as well as his keen ability to make clinical observations and correlate them with functional immunity provided the basis of the future studies that defined the human immune system. Dr. Good and his collaborator’s research facilitated the discovery of CD4 and CD8 T cells and laid the foundation for our understanding T cell homeostasis. Was it pure serendipity that the timeline of the most important human immune deficiency paralleled the great discoveries of human immunology spearheaded by Dr. Robert Good?

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Rodriguez, C.A., Koch, S., Goodenow, M. et al. Clinical implications of discordant viral and immune outcomes following protease inhibitor containing antiretroviral therapy for HIV-infected children. Immunol Res 40, 271–286 (2008). https://doi.org/10.1007/s12026-007-0031-1

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