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Payne H, Chain G, Adams S, Hunter P, Luckhurst N, Gilmour K, Lewis J, Babiker A, Cotton M, Violari A, Gibb D, Callard R, Klein N. Naive B Cell Output in HIV-Infected and HIV-Uninfected Children. AIDS Res Hum Retroviruses 2019; 35:33-39. [PMID: 30298747 PMCID: PMC6863188 DOI: 10.1089/aid.2018.0170] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
In this study, we aimed to quantify KREC (kappa-deleting recombination excision circle) levels and naive B cell output in healthy HIV-uninfected children, compared with HIV-infected South African children, before and after starting ART (antiretroviral therapy). Samples were acquired from a Child Wellness Clinic (n = 288 HIV-uninfected South African children, 2 weeks-12 years) and the Children with HIV Early Antiretroviral Therapy (CHER) trial (n = 153 HIV-infected South African children, 7 weeks-8 years). Naive B cell output was estimated using a mathematical model combining KREC levels to reflect B cell emigration into the circulation, flow cytometry measures of naive unswitched B cells to quantify total body naive B cells, and their rates of proliferation using the intracellular marker Ki67. Naive B cell output increases from birth to 1 year, followed by a decline and plateau into late childhood. HIV-infected children on or off ART had higher naive B cell outputs than their uninfected counterparts (p = .01 and p = .04). This is the first study to present reference ranges for measurements of KRECs and naive B cell output in healthy and HIV-infected children. Comparison between HIV-uninfected healthy children and HIV-infected children suggests that HIV may increase naive B cell output. Further work is required to fully understand the mechanisms involved and clinical value of measuring naive B cell output in children.
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Affiliation(s)
- Helen Payne
- UCL Great Ormond Street Institute of Child Health, London, United Kingdom
- Clinical Trials Unit, Medical Research Council, London, United Kingdom
| | - Gabriel Chain
- UCL Great Ormond Street Institute of Child Health, London, United Kingdom
| | - Stuart Adams
- UCL Great Ormond Street Institute of Child Health, London, United Kingdom
| | - Patricia Hunter
- UCL Great Ormond Street Institute of Child Health, London, United Kingdom
| | - Natasha Luckhurst
- UCL Great Ormond Street Institute of Child Health, London, United Kingdom
- Department of Immunology, Kingston University, London, United Kingdom
| | - Kimberly Gilmour
- UCL Great Ormond Street Institute of Child Health, London, United Kingdom
| | - Joanna Lewis
- UCL Great Ormond Street Institute of Child Health, London, United Kingdom
- CoMPLEX, UCL, London, United Kingdom
| | - Abdel Babiker
- UCL Great Ormond Street Institute of Child Health, London, United Kingdom
| | - Mark Cotton
- Children's Infectious Diseases Clinical Research Unit, Department of Paediatrics and Child Health, Stellenbosch University, Cape Town, South Africa
| | - Avy Violari
- Perinatal HIV Research Unit, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Diana Gibb
- UCL Great Ormond Street Institute of Child Health, London, United Kingdom
| | - Robin Callard
- UCL Great Ormond Street Institute of Child Health, London, United Kingdom
| | - Nigel Klein
- UCL Great Ormond Street Institute of Child Health, London, United Kingdom
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