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Rehman NHU, Dewan P, Gupta R, Gomber S, Raizada A. Effect of Antiretroviral Therapy on Neutrophil Oxidative Burst in Children. Indian J Pediatr 2022:10.1007/s12098-022-04321-x. [PMID: 35947271 PMCID: PMC9364305 DOI: 10.1007/s12098-022-04321-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Accepted: 06/10/2022] [Indexed: 11/28/2022]
Abstract
OBJECTIVE To ascertain the effect of human immunodeficiency virus (HIV) infection, as well as, antiretroviral therapy (ART) on neutrophil oxidative burst in children. METHODS Fifty-five children living with HIV infection (30 receiving ART for ≥ 2 y, 25 treatment-naïve) and 30 healthy controls, aged 18 mo-18 y, were assessed for hemogram and neutrophil oxidative burst. The treatment-naïve children were followed up and the above tests were repeated after 6 mo of ART. RESULTS Mean (SD) serum MPO activity at 6 mo after ART [32.1 (± 19.9) U/L] was comparable to that at disease onset [17.2 (± 23.0) U/L], although it was significantly higher compared to that in children on ART ≥ 2 y [13.3 (± 15.8) U/L] and controls [12.1 (± 11.9) U/L]. Median fluorescence intensity (MFI) of unstimulated DHR was highest at 6 mo after ART and in the treatment-naïve group, which was significantly higher than in the controls, as well as, children receiving ART ≥ 2 y. Stimulation index was highest in the control group [442.4 (341.9-562.9)], which was comparable to that in children on ART ≥ 2 y [304.2 (153.2-664.8)], but was significantly higher than the treatment-naïve cohort [266.1 (148.2-339.4)] and children on ART for 6 mo [318.8 (154.9-395.6)]. CONCLUSION A hyperinflammatory state caused by an increased serum myeloperoxidase enzyme activity and increased basal neutrophil oxidative burst was seen in untreated HIV infection and during initial 6 mo of ART. ART given for ≥ 2 y normalized the impaired neutrophilic phagocytic functions.
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Affiliation(s)
- Nama Habib Ur Rehman
- Department of Pediatrics, University College of Medical Sciences and Guru Teg Bahadur Hospital, Delhi, 110095, India
| | - Pooja Dewan
- Department of Pediatrics, University College of Medical Sciences and Guru Teg Bahadur Hospital, Delhi, 110095, India.
| | - Richa Gupta
- Department of Pathology, University College of Medical Sciences and Guru Teg Bahadur Hospital, Delhi, India
| | - Sunil Gomber
- Department of Pediatrics, University College of Medical Sciences and Guru Teg Bahadur Hospital, Delhi, 110095, India
| | - Alpana Raizada
- Department of Medicine, University College of Medical Sciences and Guru Teg Bahadur Hospital, Delhi, India
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Kinai E, Nguyen HDT, Do HQ, Matsumoto S, Nagai M, Tanuma J, Nguyen KV, Pham TN, Oka S. Influence of maternal use of tenofovir disoproxil fumarate or zidovudine in Vietnamese pregnant women with HIV on infant growth, renal function, and bone health. PLoS One 2021; 16:e0250828. [PMID: 33914827 PMCID: PMC8084453 DOI: 10.1371/journal.pone.0250828] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Accepted: 04/14/2021] [Indexed: 11/18/2022] Open
Abstract
Tenofovir disoproxil fumarate (TDF) is still widely prescribed for human immunodeficiency virus (HIV)-infected pregnant women, despite its renal and bone toxicity. Although TDF-exposed infants often show transient growth impairment, it is not clear whether maternal TDF causes infantile rickets via maternal/fetal renal dysfunction in Asian populations. This prospective observational study was conducted in Vietnam and involved pregnant HIV-infected women treated with TDF-based regimen (TDF group) or zidovudine-based regimen (AZT-group). At birth, 3, 12, and 18 months of age, and included body length, weight, head circumference, serum alkaline phosphatase (ALP), creatinine, calcium, phosphorus, urine-β2-microglobulin (U-BMG), percentage of tubular reabsorption of phosphate (%TRP), and radiographic wrist score for rickets. Age-adjusted multivariate linear regression analysis evaluated the association of TDF/AZT use during pregnancy with fetal renal function and bone health. The study included 63 mother-infant pairs (TDF group = 53, AZT group = 10). In the mothers, detectable U-BMG (>252 μg/L) was observed more frequently in the TDF- than AZT group (89 vs 50%, p<0.001), but other renal/bone parameters were similar. In infants, maternal TDF use was not associated with growth impairment, renal dysfunction, or abnormal bone findings, but with a slightly higher ALP levels (p = 0.019). However, shorter length was associated with maternal AZT (p = 0.021), and worse radiographic scores were associated with LPV/r (p = 0.024). In Vietnamese population, TDF usage during pregnancy was not associated with infant transient rickets, growth impairment, or renal dysfunction, despite mild maternal tubular impairment. Maternal AZT and LPV/r influenced infant growth and bone health, though further studies are needed to confirm this finding.
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Affiliation(s)
- Ei Kinai
- Department of Laboratory Medicine, Tokyo Medical University, Tokyo, Japan
- AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan
- * E-mail:
| | | | - Ha Quan Do
- National Hospital of Obstetrics and Gynecology, Hanoi, Vietnam
| | - Shoko Matsumoto
- AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan
| | - Moeko Nagai
- AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan
| | - Junko Tanuma
- AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan
| | | | | | - Shinichi Oka
- AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan
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Tsegay YG, Tadele A, Addis Z, Alemu A, Melku M. Magnitude of cytopenias among HIV-infected children in Bahir Dar, northwest Ethiopia: a comparison of HAART-naïve and HAART-experienced children. HIV AIDS-RESEARCH AND PALLIATIVE CARE 2017; 9:31-42. [PMID: 28260948 PMCID: PMC5325102 DOI: 10.2147/hiv.s125958] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Background AIDS, caused by HIV, is a multisystem disease that affects hematopoiesis. The aim of this study was to assess cytopenias among HIV-infected children who had a follow-up at Felege Hiwot Referral Hospital, Bahir Dar, northwest Ethiopia. Methods An institution-based cross-sectional study was conducted between April and May 2013. Systematic random sampling method was used to select the study participants. Descriptive statistics, independent t-test as well as chi-square and logistic regression were used for analysis. A p-value <0.05 was considered as statistically significant. Results A total of 224 children (112 highly active antiretroviral therapy [HAART]-naïve and 112 HAART-experienced) participated in the study. The magnitude of anemia, thrombocytopenia, neutropenia, leukopenia and pancytopenia among HAART-naïve HIV-infected children were 30.4%, 9.8%, 8%, 4.5% and 1.8%, respectively. The overall prevalence of anemia, neutropenia, thrombocytopenia, leukopenia and pancytopenia were 29.5%, 8.9%, 8%, 4.5% and 1.4%, respectively. Cluster of differentiation-4 percentage and mean corpuscular volume were significantly different between HAART-experienced and HAART-naïve children. Being of younger age and severely immunosuppressed were risk factors of anemia. Conclusion Anemia was the most common cytopenia, followed by neutropenia. Severe immunosuppression and younger age were significantly associated with anemia. Therefore, emphasis should be given for investigation and management of cytopenias in HIV-infected children, particularly for those who are immunosuppressed and of younger age.
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Affiliation(s)
| | | | | | - Agersew Alemu
- Department of Medical Parasitology, School of Biomedical and Laboratory Sciences, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia
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Singh A, Hemal A, Agarwal S, Dubey NK, Buxi G. A prospective study of haematological changes after switching from stavudine to zidovudine-based antiretroviral treatment in HIV-infected children. Int J STD AIDS 2014; 27:1145-1152. [PMID: 24516076 DOI: 10.1177/0956462414522986] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2013] [Accepted: 01/08/2014] [Indexed: 01/09/2023]
Abstract
Long-term use of stavudine is associated with a high incidence of lipodystrophy, warranting its substitution with zidovudine in first-line antiretroviral therapy (ART) regimens. In a prospective observational study, we determined the spectrum and severity of haematological changes after switching from stavudine- to zidovudine-based ART in Indian children aged 2-18 years who had received a stavudine-based ART regimen for at least 48 weeks. They were followed for 48 weeks for changes in haematological parameters and CD4 cell counts after switching to zidovudine. Of the 60 children analysed, 45 (75%) showed a significant fall in Hb (>1 g/dl). A majority developed grade 1 anaemia (14 [31%]) while only three (6%) developed grade 4 anaemia. The lowest Hb was recorded between 12 and 16 weeks with spontaneous improvement noticed after 28 weeks. A significant drop in absolute neutrophil count (5067 cells/mm3 to 3625 cells/mm3; p = 0.004) was also observed but none developed severe neutropenia. No significant changes were observed in platelet and CD4 cell counts. Since the incidence of severe drug toxicity was low with zidovudine and the majority of children recovered without intervention, drug toxicity should not preclude its routine use in poor countries.
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Affiliation(s)
- Archana Singh
- Department of Neonatology and Pediatric Medicine, PGIMER, Dr. RML Hospital, New Delhi, India
| | - Alok Hemal
- Department of Neonatology and Pediatric Medicine, PGIMER, Dr. RML Hospital, New Delhi, India
| | - Sheetal Agarwal
- Department of Neonatology and Pediatric Medicine, PGIMER, Dr. RML Hospital, New Delhi, India
| | - N K Dubey
- Department of Neonatology and Pediatric Medicine, PGIMER, Dr. RML Hospital, New Delhi, India
| | - Gurdeep Buxi
- Department of Pathology, PGIMER, Dr. RML Hospital, New Delhi, India
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Anaemia and zidovudine-containing antiretroviral therapy in paediatric antiretroviral programmes in the IeDEA Paediatric West African Database to evaluate AIDS. J Int AIDS Soc 2013; 16:18024. [PMID: 24047928 PMCID: PMC3776924 DOI: 10.7448/ias.16.1.18024] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2012] [Revised: 08/09/2013] [Accepted: 08/19/2013] [Indexed: 11/08/2022] Open
Abstract
INTRODUCTION There is a risk of anaemia among HIV-infected children on antiretroviral therapy (ART) containing zidovudine (ZDV) recommended in first-line regimens in the WHO guidelines. We estimated the risk of severe anaemia after initiation of a ZDV-containing regimen in HIV-infected children included in the IeDEA West African database. METHODS Standardized collection of data from HIV-infected children (positive PCR<18 months or positive serology ≥ 18 months) followed up in HIV programmes was included in the regional IeDEA West Africa collaboration. Ten clinical centres from seven countries contributed (Benin, Burkina Faso, Côte d'Ivoire, Gambia, Ghana, Mali and Senegal) to this collection. Inclusion criteria were age <16 years and starting ART. We explored the data quality of haemoglobin documentation over time and the incidence and predictors of severe anaemia (Hb<7 g/dL) per 100 child-years of follow-up over the duration of first-line antiretroviral therapy. RESULTS As of December 2009, among the 2933 children included in the collaboration, 45% were girls, median age was five years; median CD4 cell percentage was 13%; median weight-for-age z-score was-2.7; and 1772 (60.4%) had a first-line ZDV-containing regimen. At baseline, 70% of the children with a first-line ZDV-containing regimen had a haemoglobin measure available versus 76% in those not on ZDV (p ≤ 0.01): the prevalence of severe anaemia was 3.0% (n=38) in the ZDV group versus 10.2% (n=89) in those without (p<0. 01). Over the first-line follow-up, 58.9% of the children had ≥ 1 measure of haemoglobin available in those exposed to ZDV versus 60.4% of those not (p=0.45). Severe anaemia occurred in 92 children with an incidence of 2.47 per 100 child-years of follow-up in those on a ZDV-containing regimen versus 4.25 in those not (p ≤ 0.01). Adjusted for age at ART initiation and first-line regimen, a weight-for-age z-score ≤-3 was a strong predictor associated with a 5.59 times risk of severe anaemia (p<0.01). CONCLUSIONS Severe anaemia is frequent at baseline and guides the first-line ART prescription, but its incidence seems rare among children on ART. Severe malnutrition at baseline is a strong predictor for development of severe anaemia, and interventions to address this should form an integral component of clinical care.
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Sohn AH, Hazra R. The changing epidemiology of the global paediatric HIV epidemic: keeping track of perinatally HIV-infected adolescents. J Int AIDS Soc 2013; 16:18555. [PMID: 23782474 PMCID: PMC3687075 DOI: 10.7448/ias.16.1.18555] [Citation(s) in RCA: 115] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2013] [Revised: 04/10/2013] [Accepted: 04/16/2013] [Indexed: 01/01/2023] Open
Abstract
The global paediatric HIV epidemic is shifting into a new phase as children on antiretroviral therapy (ART) move into adolescence and adulthood, and face new challenges of living with HIV. UNAIDS reports that 3.4 million children aged below 15 years and 2 million adolescents aged between 10 and 19 years have HIV. Although the vast majority of children were perinatally infected, older children are combined with behaviourally infected adolescents and youth in global reporting, making it difficult to keep track of their outcomes. Perinatally HIV-infected adolescents (PHIVA) are a highly unique patient sub-population, having been infected before development of their immune systems, been subject to suboptimal ART options and formulations, and now face transition from complete dependence on adult caregivers to becoming their own caregivers. As we are unable to track long-term complications and survival of PHIVA through national and global reporting systems, local and regional cohorts are the main sources for surveillance and research among PHIVA. This global review will utilize those data to highlight the epidemiology of PHIVA infection, treatment challenges and chronic disease risks. Unless mechanisms are created to count and separate out PHIVA outcomes, we will have few opportunities to characterize the negative consequences of life-long HIV infection in order to find ways to prevent them.
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Affiliation(s)
- Annette H Sohn
- TREAT Asia/amfAR - The Foundation for AIDS Research, Bangkok, Thailand.
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Musiime V, Cook A, Kayiwa J, Zangata D, Nansubuga C, Arach B, Kenny J, Wavamunno P, Komunyena J, Kabamba D, Asiimwe AR, Mirembe G, Abongomera G, Mulenga V, Kekitiinwa A, Kityo C, Walker SA, Klein N, Gibb DM. Anthropometric measurements and lipid profiles to detect early lipodystrophy in antiretroviral therapy experienced HIV-infected children in the CHAPAS-3-Trial. Antivir Ther 2013; 19:269-76. [DOI: 10.3851/imp2695] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/01/2013] [Indexed: 10/26/2022]
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Recovery from lipodystrophy in HIV-infected children after substitution of stavudine with zidovudine in a non-nucleoside reverse transcriptase inhibitor-based antiretroviral therapy. Pediatr Infect Dis J 2012; 31:384-8. [PMID: 22124211 DOI: 10.1097/inf.0b013e31823f0e11] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Substitution of stavudine with zidovudine may lead to recovery from lipodystrophy (LD) in HIV-infected children. METHODS We prospectively followed HIV-infected children enrolled in an earlier LD study conducted between 2002 and 2004 at Chiang Mai University Hospital in northern Thailand. In 2006, stavudine was substituted with zidovudine. All children were evaluated by a clinical LD checklist modified from that of the European Pediatric LD study group together with waist/hip measurement at baseline and 24, 48, 72, and 96 weeks after substitution. The waist-to-hip ratios were converted to age- and sex-adjusted z scores based on normal ranges in healthy Thai children. RESULTS Forty-five lipodystrophic children with 36 episodes of lipohypertrophy and 22 episodes of lipoatrophy were enrolled. By weeks 48 and 96 after substitution, 40% and 47% of lipohypertrophy resolved, whereas 59% and 73% of lipoatrophy resolved, respectively. The rate of resolution of lipoatrophy was higher than that of lipohypertrophy at 48 weeks after substitution and thereafter. Ninety-six weeks after changing to zidovudine therapy, 8 children still had LD (1 with both lipoatrophy and lipohypertrophy, 7 with lipohypertrophy). No clinically significant hematologic adverse event was observed. CONCLUSIONS Substitution of stavudine with zidovudine resulted in decreased severity or resolution of LD among HIV-infected children and adolescents.
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Molineux G, Foote M, Arvedson T. Use of Filgrastim (r-metHuG-CSF) in Human Immunodeficiency Virus Infection. TWENTY YEARS OF G-CSF 2012. [PMCID: PMC7123730 DOI: 10.1007/978-3-0348-0218-5_18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In 2008, an estimated 33.4 million individuals worldwide were infected with the human immunodeficiency virus (HIV) [1]. Only a few years ago, infection with HIV almost invariably culminated in the development of the acquired immunodeficiency syndrome (AIDS), characterized by severe depletion of CD4+ lymphocytes leading to derangements predominantly affecting cell-mediated immunity, but affecting humoral immunity as well [2]. In the later stages of AIDS, neutropenia and neutrophil functional deficits were common sequelae of HIV infection, other opportunistic infections, or HIV- or opportunistic infection-related treatment [3]. The care of the HIV-infected patient was palliative in nature, and the possibility that use of filgrastim (rHuG-CSF) might extend survival in late-stage AIDS patients with severe neutropenia or severe opportunistic infections, or might be a treatment for HIV infection itself, was explored [4]. Subsequently, however, the development of protease inhibitors and the widespread adoption of their use in multidrug regimens of highly active antiretroviral therapy (HAART) revolutionized the care of HIV-infected patients, and the number of patients dying from HIV decreased dramatically [5].
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Affiliation(s)
- Graham Molineux
- Amgen Inc., One Amgen Center Drive, Thousand Oaks, 91320 California USA
| | - MaryAnn Foote
- MA Foote Associates, Par Five Court 4284, Westlake Village, 91362 California USA
| | - Tara Arvedson
- Amgen, Inc., One Amgen Center Dr. 1, Thousand Oaks, 91320 California USA
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Tang LL, Jin CZ, Wu LJ, Brockmeyer NH, Potthoff A, Wu NP. The Impact of Highly Active Antiretroviral Treatment on the Blood Profiles of Patients with Acquired Immune Deficiency Syndrome. J Int Med Res 2011; 39:1520-8. [PMID: 21986156 DOI: 10.1177/147323001103900442] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
This study retrospectively investigated the short- and long-term impact of highly active antiretroviral treatment (HAART) on the blood profiles of patients with acquired immune deficiency syndrome (AIDS), and their relationship with disease progression. CD4+ T-cell count was measured by flow cytometry, plasma viral load of human immunodeficiency virus (HIV) RNA was detected by reverse transcription—polymerase chain reaction, and blood profile was determined by an automated analyser. CD4+ T-cell count, total lymphocyte count (TLC) and haemoglobin concentration improved gradually in patients with AIDS after the initiation of HAART. Long-term effective HAART significantly increased CD4+ T-cell counts TLC and haemoglobin concentrations, and reduced viral load to undetectable levels. An increase in haemoglobin was positively correlated with an increase in CD4+ T-cells. These findings suggest that TLC is a valuable tool for determining the initiation of HAART, and that the haemoglobin concentration could be an additional indicator for long-term monitoring of HAART in resource-limited settings.
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Affiliation(s)
- LL Tang
- State Key Laboratory for Diagnosis and Treatment of Infectious Disease, the First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
| | - CZ Jin
- State Key Laboratory for Diagnosis and Treatment of Infectious Disease, the First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
| | - LJ Wu
- Department of Nursing, School of Medicine, Taizhou College, Taizhou, China
| | - NH Brockmeyer
- Department of Dermatology, Allergy and STDs, Ruhr University Bochum, Bochum, Germany
| | - A Potthoff
- Department of Dermatology, Allergy and STDs, Ruhr University Bochum, Bochum, Germany
| | - NP Wu
- State Key Laboratory for Diagnosis and Treatment of Infectious Disease, the First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
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Baseline severe anaemia should not preclude use of zidovudine in antiretroviral-eligible patients in resource-limited settings. J Int AIDS Soc 2010; 13:42. [PMID: 21047391 PMCID: PMC2991285 DOI: 10.1186/1758-2652-13-42] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2010] [Accepted: 11/03/2010] [Indexed: 11/12/2022] Open
Abstract
Background Stavudine is no longer recommended as part of first-line therapy for patients initiating antiretroviral therapy (ART) in Uganda. Most patients are currently initiated on zidovudine-containing regimens, which can induce anaemia. We investigated the risk factors for early severe anaemia in the first six months of ART initiation. Methods We defined baseline (ART initiation) anaemia as haemoglobin (Hb) ≤9.5 g/dL, baseline severe anaemia as Hb ≤8 g/dL, and early severe anaemia as Hb ≤8 g/dL within six months of ART initiation. Risk factors for the development of early severe anaemia were analyzed using a multivariable logistic regression model. Results In total, 5494 patients initiated ART, 821 (15%) had baseline anaemia, and 296 (5%) had baseline severe anaemia. Early severe anaemia occurred in 109 (4%) of 3105 patients who had at least one Hb measurement in the first six months on ART. Patients with baseline anaemia had a larger increase in Hb (median g/dL [IQR]) within the first six months compared with non-anaemic patients (2.9 [1.7, 4.6] vs. 0.7 [-0.2, 1.7], p < 0.0001). Having a new tuberculosis episode OR 3.69 (95% CI 1.64 - 8.32), MCV <80fL OR 1.60 (95% CI 1.01- 2.52) and baseline severe anaemia OR 5.27 (95% CI 3.00 - 9.26) were associated with early severe anaemia. Initiation on a zidovudine-based regimen was not associated with an increased risk of early severe anaemia. Conclusions Among patients in an urban HIV clinic in Uganda, severe anaemia is modestly prevalent at ART initiation and improves with ART in the majority of patients. These data suggest that baseline severe anaemia should not be used as a criterion for avoiding the use of zidovudine in patients initiating ART in resource-limited settings.
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Kucherenko Y, Geiger C, Shumilina E, Föller M, Lang F. Inhibition of cation channels and suicidal death of human erythrocytes by zidovudine. Toxicology 2008; 253:62-9. [PMID: 18822339 DOI: 10.1016/j.tox.2008.08.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2008] [Revised: 08/20/2008] [Accepted: 08/21/2008] [Indexed: 12/13/2022]
Abstract
Zidovudine, a drug widely used in the treatment of AIDS, has been shown to influence cytosolic calcium activity in HIV-infected lymphocytes. Thus, zidovudine may modify the activity of Ca(2+)-permeable ion channels. In erythrocytes, activation of Ca(2+)-permeable cation channels stimulates eryptosis, the suicidal erythrocyte death. Eryptosis is characterized by cell shrinkage (apparent from a decrease of forward scatter) and phosphatidylserine (PS) exposure (apparent from annexin V-binding) at the erythrocyte surface. Triggers of eryptosis include isotonic cell shrinkage (Cl(-) replacement by gluconate), energy depletion (removal of glucose) or exposure to a variety of drugs including azathioprine. The present study explored, whether zidovudine influences the activity of erythrocytic Ca(2+)-permeable cation channels and eryptosis. Whole-cell patch-clamp recordings indeed revealed that zidovudine blocked the Ca(2+)-permeable cation channels activated by Cl(-) removal. In the presence of Cl(-) and glucose, the percentage of annexin V-binding cells was low and not significantly modified by the presence of zidovudine. Both, Cl(-) removal and glucose depletion increased annexin V-binding and decreased forward scatter, effects significantly blunted by zidovudine (2 microg/ml). According to Fluo3 fluorescence, zidovudine (2 microg/ml) did not significantly modify cytosolic Ca(2+) concentration under control conditions, but significantly blunted the increase in cytosolic Ca(2+) activity following glucose depletion. Furthermore, zidovudine significantly inhibited azathioprine-induced eryptosis. The present observations disclose a completely novel effect of zidovudine, i.e. its inhibitory influence on Ca(2+) entry and subsequent suicidal erythrocyte death during isotonic cell shrinkage or energy depletion.
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Tanenbaum L, Tuffanelli DL. Antimalarial agents. Chloroquine, hydroxychloroquine, and quinacrine. ARCHIVES OF DERMATOLOGY 1980; 116:587-591. [PMID: 6990871 DOI: 10.1007/978-1-61779-213-7_16] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
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