1
|
Mekue LM, Nkenfou CN, Dambaya B, Fotso I, Nguefack F, Fainguem N, Lobè EE, Kuiaté JR, Ndjolo A. IMPLICATION OF FIVE AIDS RELATED GENES IN MOTHER-TO-CHILD TRANSMISSION AND ACQUISITION OF HUMAN IMMUNODEFICIENCY VIRUS 1 IN CAMEROON. Afr J Infect Dis 2018; 13:1-10. [PMID: 30596191 PMCID: PMC6305080 DOI: 10.21010/ajid.v13i1.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Revised: 02/26/2018] [Accepted: 02/27/2018] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Genetic variants in the mother and/or infant have been described with evidence to be associated with mother-to-child transmission of HIV, but somehow with contradictory results depending on ethnic or geographic populations. We aimed at looking at the association between the allelic frequency of some genes with vertical transmission or acquisition of HIV in Cameroon. METHODOLOGY A total of 262 mothers (212 HIV-infected and 50 HIV non-infected) with their babies (270 in total, 42 HIV exposed-infected, 178 HIV exposed non-infected and 50 HIV non-exposed) were recruited in Yaounde-Cameroon. Their genotypes for CCR5-Delta32, CCR5 promoter59029A/G, CCR2-64I, SDF1-3'A and TRIM5α-136Q were analyzed using polymerase chain reaction and restriction fragment length polymorphisms. RESULTS Allelic frequencies were 14.7%, 41.9%, 9.5% and 14.7% for CCR2-64I, CCR5-59029-A/G, TRIM5α-136Q, SDF1-3'A respectively in the mothers and 18.8%, 35.9%, 11.3% and 20.5% in the babies. No delta 32 mutation in the CCR5 gene was found. The mutant genotype was most significantly frequent in the non-transmitter than in the transmitter (p= 0.005) for the SDF-1 3'A. SDF1-3'A [Odd ratio = 1.69; 95% confidence interval: 0.1158 to 0.7277); was associated to MTCT, P = 0.008.The homozygote mutants for the CCR5-59029-G were significantly higher in the infected than in the exposed uninfected babies (p=0.04). The mutations in the other genes were neither implicated in the acquisition nor in the transmission. CONCLUSION SDF1-3'A was associated to the reduction of MTCT. The CCR5-59029-A/G favored acquisition of HIV by babies. Our study showed that polymorphisms in chemokine ligand may be involved in MTCT.
Collapse
Affiliation(s)
- Linda Mouafo Mekue
- Faculty of Science, University of Dschang, P.O. Box 56, Dschang, Cameroon,Chantal BIYA International Reference Centre, P.O. Box 3077, Yaounde, Cameroon
| | - Céline Nguefeu Nkenfou
- Chantal BIYA International Reference Centre, P.O. Box 3077, Yaounde, Cameroon,Higher Teacher Training College, University of Yaounde I, P.O. Box 47, Yaounde, Cameroon,Corresponding Author’s E-mail:
| | - Beatrice Dambaya
- Chantal BIYA International Reference Centre, P.O. Box 3077, Yaounde, Cameroon
| | - Idriss Fotso
- Chantal BIYA International Reference Centre, P.O. Box 3077, Yaounde, Cameroon
| | - Felicitée Nguefack
- Chantal BIYA Foundation’ Mother and Child Center, P.O. Box 1936, Yaounde, Cameroon
| | - Nadine Fainguem
- Chantal BIYA International Reference Centre, P.O. Box 3077, Yaounde, Cameroon
| | - Elise Elong Lobè
- Chantal BIYA International Reference Centre, P.O. Box 3077, Yaounde, Cameroon
| | - Jules Roger Kuiaté
- Faculty of Science, University of Dschang, P.O. Box 56, Dschang, Cameroon
| | - Alexis Ndjolo
- Chantal BIYA International Reference Centre, P.O. Box 3077, Yaounde, Cameroon,Faculty of Medicine and Biomedical Science, University of Yaounde I, P.O Box 1364, Yaounde, Cameroon
| |
Collapse
|
2
|
Mouafo LCM, Dambaya B, Ngoufack NN, Nkenfou CN. Host Molecular Factors and Viral Genotypes in the Mother-to-Child HIV-1 Transmission in Sub-Saharan Africa. J Public Health Afr 2017; 8:594. [PMID: 28748061 PMCID: PMC5510234 DOI: 10.4081/jphia.2017.594] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2016] [Accepted: 05/02/2017] [Indexed: 12/22/2022] Open
Abstract
Maternal viral load and immune status, timing and route of delivery, viral subtype, and host genetics are known to influence the transmission, acquisition and disease progression of human immunodeficiency virus-1 (HIV-1) infection. This review summarizes the findings from published works on host molecular factors and virus genotypes affecting mother to child transmission (MTCT) in Africa and identifies the gaps that need to be addressed in future research. Articles in PubMed, Google and AIDSearch and relevant conference abstracts publications were searched. Accessible articles on host factors and viral genetics impacting the MTCT of HIV, done on African populations till 2015 were downloaded. Forty-six articles were found and accessed; 70% described host genes impacting the transmission. The most studied gene was the CCR5 promoter, followed by the CCR2-64I found to reduce MTCT; then SDF1-3’A shown to have no effect on MTCT and others like the DC-SIGNR, CD4, CCL3 and IP-10. The HLA class I was most studied and was generally linked to the protective effect on MTCT. Breast milk constituents were associated to protection against MTCT. However, existing studies in Sub Saharan Africa were done just in few countries and some done without control groups. Contradictory results obtained may be due to different genetic background, type of controls, different socio-cultural and economic environment and population size. More studies are thus needed to better understand the mechanism of transmission or prevention.
Collapse
Affiliation(s)
- Linda Chapdeleine M Mouafo
- Department of Biochemistry, University of Dschang, Yaoundé, Cameroon.,Systems Biology Laboratory, Chantal BIYA International Reference Centre for Research on HIV/AIDS Prevention and Management, Yaoundé, Cameroon
| | - Béatrice Dambaya
- Systems Biology Laboratory, Chantal BIYA International Reference Centre for Research on HIV/AIDS Prevention and Management, Yaoundé, Cameroon.,Department of Animal Sciences, University of Yaounde 1, Cameroon
| | - Nicole N Ngoufack
- Systems Biology Laboratory, Chantal BIYA International Reference Centre for Research on HIV/AIDS Prevention and Management, Yaoundé, Cameroon.,Department of Biochemistry, University of Yaounde 1, Cameroon
| | - Céline N Nkenfou
- Systems Biology Laboratory, Chantal BIYA International Reference Centre for Research on HIV/AIDS Prevention and Management, Yaoundé, Cameroon.,Higher Teachers' Training College, University of Yaounde 1, Cameroon
| |
Collapse
|
3
|
da Silva RC, Bedin E, Mangano A, Aulicino P, Pontillo A, Brandão L, Guimarães R, Arraes LC, Sen L, Crovella S. HIV mother-to-child transmission: a complex genetic puzzle tackled by Brazil and Argentina research teams. INFECTION GENETICS AND EVOLUTION 2013; 19:312-22. [PMID: 23524206 DOI: 10.1016/j.meegid.2013.03.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2012] [Revised: 03/05/2013] [Accepted: 03/07/2013] [Indexed: 11/24/2022]
Abstract
Human immunodeficiency virus (HIV) mother-to-child transmission is a complex event, depending upon environmental factors and is affected by host genetic factors from mother and child, as well as viral genetic elements. The integration of multiple parameters (CD4 cell count, virus load, HIV subtype, and host genetic markers) could account for the susceptibility to HIV infection, a multifactorial trait. The goal of this manuscript is to analyze the immunogenetic factors associated to HIV mother-to-child transmission, trying to unravel the genetic puzzle of HIV mother-to-child transmission and considering the experience in this topic of two research groups from Brazil and Argentina.
Collapse
Affiliation(s)
- R Celerino da Silva
- Department of Genetics, Federal University of Pernambuco, Av. Prof. Moraes Rego, s/n°, CEP 50.670-420, Cidade Universitária, Recife, Pernambuco, Brazil; Laboratory of Immunopathology Keizo Asami, Federal University of Pernambuco, Av. Prof. Moraes Rego, s/n°, CEP 50.670-420, Cidade Universitária, Recife, Pernambuco, Brazil
| | | | | | | | | | | | | | | | | | | |
Collapse
|
4
|
Shalekoff S, Schramm DB, Lassaunière R, Picton AC, Tiemessen CT. Differences are evident within the CXCR4–CXCL12 axis between ethnically divergent South African populations. Cytokine 2013; 61:792-800. [DOI: 10.1016/j.cyto.2013.01.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2012] [Revised: 11/09/2012] [Accepted: 01/01/2013] [Indexed: 01/05/2023]
|
5
|
Ammaranond P, Sanguansitthianan S, Phaengchomduan P, Sae-Lee C, Mardkhumchan S. Impact of CCR2 and SDF1 polymorphisms on disease progression in HIV-infected subjects in Thailand. J Clin Lab Anal 2013; 27:38-44. [PMID: 23325742 DOI: 10.1002/jcla.21559] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2012] [Accepted: 10/04/2012] [Indexed: 11/06/2022] Open
Abstract
BACKGROUND The genotypic polymorphisms of CCR5, CCR2, and SDF1 were analyzed to determine their impact as potential confounders with regard to disease progression because of the role that host genetic factors appear to be involved in determining rates of disease progression. METHODS Genomic DNA was extracted from Ethylenediaminetetraacetate whole blood using Qiagen DNA extraction kit. The amplification of CCR5, CCR2, and SDF1 genes was performed by PCR. RESULTS Two hundred and twenty-one samples were genotyped for the CCR5, CCR2, and SDF1 mutation. Among these, all (100%) were identified as wild type for CCR5. All were then investigated considering the impact on CD4+ T-cell counts. Samples were divided into two groups based on the CD4+ T-cell numbers. It revealed that in the group of CD4+ T-cell counts ≥200 cells/μl, 15 were found for the homozygous for SDF1 gene (3'A/3'A) whereas one was found in the group of CD4+ T-cell counts <200 cells/μl. Homozygosity for the CCR2 polymorphisms (64I/64I) were five in the group of CD4+ T-cell counts ≥200 cells/μl and none were found in the group of CD4+ T-cell counts <200 cells/μl. These results demonstrated that there was a significant association between CD4+ T-cell numbers and CCR2 and SDF1 polymorphisms (P < 0.001). CONCLUSIONS The mutation of CCR2 and SDF1 genes showed a significant difference in the distribution of CD4+ T-cell numbers (P < 0.001) whereas mutation of chemokine coreceptor CCR5 was not appeared to be associated with the impact of CD4+ T-cell counts.
Collapse
Affiliation(s)
- Palanee Ammaranond
- Department of Transfusion Medicine, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok, Thailand.
| | | | | | | | | |
Collapse
|
6
|
Khabour OF, Abu-Haweleh LJ, Alzoubi KH. Distribution of CCR-5Δ32, CCR2-64I, and SDF-1-3'A alleles among Jordanians. AIDS Res Hum Retroviruses 2013; 29:151-5. [PMID: 22770415 DOI: 10.1089/aid.2012.0107] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Entry of HIV virus into cells is mediated by chemokine receptors. Genetic variations in chemokine receptors have been shown to modulate susceptibility to HIV infection and disease course. In this study, the frequencies of CCR5 (CCR5-Δ32), CCR2 (CCR2-64I), and SDF-1 (SDF-1-3') gene polymorphisms were determined in a Jordanian population. A total of 540 subjects were randomly selected from different regions of Jordan (South, Middle, and North). Six individuals were found to carry the CCR5-Δ32 allele (0.6%) and only in the heterozygous genotype. The frequencies of CCR2-64I and SDF1-3'A were 17.5% and 34.2%, respectively. In addition, no significant difference in the distribution of the examined polymorphisms among different regions of Jordan was detected. In conclusion, the CCR5-Δ32 allele is rare, whereas the CCR2-64I and SDF1-3'A alleles are common among Jordanians.
Collapse
Affiliation(s)
- Omar F. Khabour
- Department of Medical Laboratory Sciences, Jordan University of Science and Technology, Irbid, Jordan
| | - Laila J. Abu-Haweleh
- Department of Medical Laboratory Sciences, Jordan University of Science and Technology, Irbid, Jordan
| | - Karem H. Alzoubi
- Department of Clinical Pharmacy, Jordan University of Science and Technology, Irbid, Jordan
| |
Collapse
|
7
|
Gianesin K, Freguja R, Carmona F, Zanchetta M, Del Bianco P, Malacrida S, Montagna M, Rampon O, Giaquinto C, De Rossi A. The role of genetic variants of Stromal cell-Derived Factor 1 in pediatric HIV-1 infection and disease progression. PLoS One 2012; 7:e44460. [PMID: 22962615 PMCID: PMC3433455 DOI: 10.1371/journal.pone.0044460] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2012] [Accepted: 08/02/2012] [Indexed: 02/04/2023] Open
Abstract
Stromal cell-Derived Factor 1 (SDF1) is the natural ligand of CXCR4, the coreceptor of HIV-1 X4 viruses. This study investigated the role of the single nucleotide polymorphism (SNP) rs1801157 (NM_000609.5:c.*519G>A) of the SDF1 gene in the natural history of mother-to-child transmission of HIV-1 and disease progression of HIV-1-infected children. The study was conducted in 428 children born to HIV-1-seropositive mothers, who had not undergone antiretroviral therapy (ART) during pregnancy, and in 120 HIV-1-infected children for whom the end-point was the onset of AIDS or the initiation of ART; 16 children developed early AIDS (<24 months of life), 13 from 24 to 84 months of age, and 14 had late AIDS (>84 months). The rs1801157 SNP was not associated with risk of perinatal infection in any genetic models tested. By contrast, this SNP influenced disease progression in a time-dependent manner. rs1801157 GA heterozygous children had a higher risk of late AIDS (HR = 6.3, 95%CI 1.9–20.7, p = 0.002) than children with the rs1801157 GG genotype. Children were studied for viral coreceptor usage at birth, after 84 months of age and/or at AIDS onset. While R5 viruses using CCR5 coreceptor were predominant at birth (94%) and at early AIDS (85%), viruses using CXCR4 coreceptor emerged during the course of infection and were detected in 49% of children older than 84 months and in 62% of late AIDS. The rs1801157 SNP did not influence the emergence of R5X4 viruses, but children with the rs1801157 GA genotype and R5X4 viruses were at significantly higher risk of late AIDS than children with rs1801157 GG genotype (OR = 8.0, 95% CI 1.2–52.2, p = 0.029). Our results indicate that the rs1801157 SNP does not influence perinatal infection, but impacts disease progression. This effect is time-dependent and linked to the coreceptor-usage of viral variants that undergo evolution during the course of HIV-1 infection.
Collapse
Affiliation(s)
- Ketty Gianesin
- Section of Oncology and Immunology, AIDS Reference Center, Department of Surgery, Oncology and Gastroenterology, University of Padova, Padova, Italy
| | - Riccardo Freguja
- Section of Oncology and Immunology, AIDS Reference Center, Department of Surgery, Oncology and Gastroenterology, University of Padova, Padova, Italy
| | | | | | | | - Sandro Malacrida
- Department of Neurosciences, University of Padova, Padova, Italy
| | | | - Osvalda Rampon
- Department of Pediatrics, University of Padova, Padova, Italy
| | - Carlo Giaquinto
- Department of Pediatrics, University of Padova, Padova, Italy
| | - Anita De Rossi
- Section of Oncology and Immunology, AIDS Reference Center, Department of Surgery, Oncology and Gastroenterology, University of Padova, Padova, Italy
- Istituto Oncologico Veneto – IRCCS, Padova, Italy
- * E-mail:
| |
Collapse
|
8
|
Louvain de Souza T, de Souza Campos Fernandes RC, Medina-Acosta E. HIV-1 control in battlegrounds: important host genetic variations for HIV-1 mother-to-child transmission and progression to clinical pediatric AIDS. Future Virol 2012. [DOI: 10.2217/fvl.12.49] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
HIV-1 mother-to-child transmission (MTCT) is the passing of maternal HIV-1 to the offspring during pregnancy, labor and delivery, and/or breastfeeding. HIV-1 MTCT and the evolution to pediatric AIDS are multifactorial, dynamic and variable phenotypic conditions. Both genetic and nongenetic variables can influence susceptibility to HIV-1 MTCT or the rate of progression to clinical pediatric AIDS. In this review, we summarize the current state of knowledge about the roles of genetic variations seen in host immune response genes, and those that have been independently associated, mostly through population genetics of candidate genes, with interindividual susceptibility to HIV-1 MTCT, and progression to pediatric AIDS. We examine common and rare host genetic variations at coding and noncoding polymorphisms, whether functional or not, in agonists and antagonists of the immune response, which have been implicated in HIV-1 control in battlegrounds of cell entry, replication and evolution to AIDS. Further, we point to over 380 single-nucleotide polymorphisms, mostly within the HLA super region, recently identified in unbiased genome-wide association studies of HIV replication and evolution in adults, still unexplored in the context of HIV-1 MTCT, and which are likely to also influence susceptibility to pediatric HIV-1/AIDS.
Collapse
Affiliation(s)
- Thais Louvain de Souza
- Molecular Identification & Diagnosis Unit, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Brazil
| | - Regina Célia de Souza Campos Fernandes
- Municipal Program for the Surveillance of Sexually Transmitted Diseases & Acquired Immunodeficiency Syndrome of Campos dos Goytacazes, Brazil
- Faculty of Medicine of Campos, Campos dos Goytacazes, Brazil
| | | |
Collapse
|
9
|
Sharma G, Kaur G, Mehra N. Genetic correlates influencing immunopathogenesis of HIV infection. Indian J Med Res 2012; 134:749-68. [PMID: 22310811 PMCID: PMC3284087 DOI: 10.4103/0971-5916.92623] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Variability to HIV infection, its progression as well as responsiveness to antiretroviral therapy (ART) is observed among individuals including viraemia controllers or exposed uninfected, rapid versus slow progressors and ART responders compared to non responders. This differential responsiveness/vulnerability to HIV-1 is governed by multiple host genetic factors that include HLA, cytokines, chemokines, their receptors and others. This review highlights the influence of these genetic factors on HIV/AIDS outcome; however, in India, the information in this area is very limited and most of these genetic studies have been conducted in Caucasian and South African populations. Considering, the population specific differences in the frequencies of protective or susceptibility favouring alleles and their influence on the disease outcome, it is of utmost importance to strengthen ongoing efforts towards defining largely unknown genetic propensity in Indian population, particularly by recruitment of large cohorts of well categorized exposed uninfected individuals, rapid, long term non progressors and elite viraemic controllers. Multi-parametric analysis of these potentially interactive immunogenetic variables in these cohorts may help to define potential targets for diagnostics and therapy in a population specific manner.
Collapse
Affiliation(s)
- Gaurav Sharma
- Department of Transplant Immunology & Immunogenetics, All India Institute of Medical Sciences, New Delhi, India
| | | | | |
Collapse
|
10
|
Cavarelli M, Scarlatti G. Human immunodeficiency virus type 1 mother-to-child transmission and prevention: successes and controversies. J Intern Med 2011; 270:561-79. [PMID: 21929711 DOI: 10.1111/j.1365-2796.2011.02458.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The World Health Organization (WHO) and United Nations Programme on HIV/AIDS (UNAIDS) estimated that an additional 370 000 new human immunodeficiency virus type 1 (HIV-1) infections occurred in children in 2009, mainly through mother-to-child transmission (MTCT). Intrapartum transmission contributes to approximately 20-25% of infections, in utero transmission to 5-10% and postnatal transmission to an additional 10-15% of cases. MTCT accounts for only a few hundred infected newborns in those countries in which services are established for voluntary counselling and testing of pregnant women, and a supply of antiretroviral drugs is available throughout pregnancy with recommendations for elective Caesarean section and avoidance of breastfeeding. The single-dose nevirapine regimen has provided the momentum to initiate MTCT programmes in many resource-limited countries; however, regimens using a combination of antiretroviral drugs are needed also to effectively reduce transmission via breastfeeding.
Collapse
Affiliation(s)
- M Cavarelli
- Unit of Viral Evolution and Transmission, DITID, San Raffaele Scientific Institute, Milan, Italy
| | | |
Collapse
|
11
|
Ellington SR, King CC, Kourtis AP. Host factors that influence mother-to-child transmission of HIV-1: genetics, coinfections, behavior and nutrition. Future Virol 2011; 6:1451-1469. [PMID: 29348780 DOI: 10.2217/fvl.11.119] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Mother-to-child transmission (MTCT) is the most important mode of HIV-1 acquisition among infants and children and it can occur in utero, intrapartum and postnatally through breastfeeding. Great progress has been made in preventing MTCT through use of antiretroviral regimens during gestation, labor/delivery and breastfeeding. The mechanisms of MTCT, however, are multifactorial and remain incompletely understood. This review focuses on select host factors affecting MTCT, in particular genetic factors, coexisting infections, behavioral factors and nutrition. Whereas much emphasis has been placed on decreasing maternal HIV-1 viral load, an important determinant of MTCT, through use of antiretroviral agents, complementary focus on overall maternal health is often neglected. By addressing coinfections in mothers and infants, improving the mother's nutritional status and modifying risky behaviors and practices, not only is maternal and child health improved, but a direct benefit in reducing MTCT can be derived. The study of genetic variations in susceptibility to HIV-1 infection is rapidly evolving, and the future is likely to bring revolutionary changes in HIV-1 prevention by enhancing natural resistance to infection and by individually tailoring pharmacologic regimens.
Collapse
Affiliation(s)
- Sascha R Ellington
- Division of Reproductive Health, National Center for Chronic Disease Prevention & Health Promotion, CDC, 4770 Buford Highway, NE, MS K34, Atlanta, GA 30341, USA
| | - Caroline C King
- Division of Reproductive Health, National Center for Chronic Disease Prevention & Health Promotion, CDC, 4770 Buford Highway, NE, MS K34, Atlanta, GA 30341, USA
| | - Athena P Kourtis
- Division of Reproductive Health, National Center for Chronic Disease Prevention & Health Promotion, CDC, 4770 Buford Highway, NE, MS K34, Atlanta, GA 30341, USA
| |
Collapse
|
12
|
Cavarelli M, Scarlatti G. HIV-1 co-receptor usage: influence on mother-to-child transmission and pediatric infection. J Transl Med 2011; 9 Suppl 1:S10. [PMID: 21284900 PMCID: PMC3105501 DOI: 10.1186/1479-5876-9-s1-s10] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Viral CCR5 usage is not a predictive marker of mother to child transmission (MTCT) of HIV-1. CXCR4-using viral variants are little represented in pregnant women, have an increased although not significant risk of transmission and can be eventually also detected in the neonates. Genetic polymorphisms are more frequently of relevance in the child than in the mother. However, specific tissues as the placenta or the intestine, which are involved in the prevalent routes of infection in MTCT, may play an important role of selective barriers. The virus phenotype of the infected children, like that of adults, can evolve from R5 to CXCR4-using phenotype or remain R5 despite clinical progression to overt immune deficiency. The refined classification of R5 viruses into R5(narrow) and R5(broad) resolves the enigma of the R5 phenotype being associated with the state of immune deficiency. Studies are needed to address more in specific the relevance of these factors in HIV-1 MTCT and pediatric infection of non-B subtypes.
Collapse
Affiliation(s)
- Mariangela Cavarelli
- Unit of Viral Evolution and Transmission, Division of Immunology, Transplant and Infectious Diseases, San Raffaele Scientific Institute, Via Olgettina 58, 20132 Milan, Italy
| | | |
Collapse
|
13
|
Abstract
More than 400,000 children were infected with (HIV-1) worldwide in 2008, or more than 1000 children per day. Mother-to-child transmission (MTCT) of HIV-1 is the most important mode of HIV acquisition in infants and children. MTCT of HIV-1 can occur in utero, intrapartum, and postnatally through breastfeeding. Great progress has been made in preventing such transmission, through the use of antiretroviral prophylactic regimens to the mother during gestation and labor and delivery and to either mother or infant during breast feeding. The timing and mechanisms of transmission, however, are multifactorial and remain incompletely understood. This article summarizes what is known about the pathogenetic mechanisms and routes of MTCT of HIV-1, and includes virologic, immunologic, genetic, and mucosal aspects of transmission.
Collapse
|
14
|
Katz DA, John-Stewart GC, Richardson BA, Majiwa M, Mabuka JM, Lohman-Payne B, Farquhar C. CCR5, RANTES and SDF-1 polymorphisms and mother-to-child HIV-1 transmission. Int J Immunogenet 2010; 37:301-5. [PMID: 20518834 DOI: 10.1111/j.1744-313x.2010.00924.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Summary Among 288 HIV-1-infected, breastfeeding women who received zidovudine prophylaxis and were followed with their infants in Nairobi, we found no associations between maternal genetic polymorphisms in CCR5 (59029G/A, 59353T/C, 59356T/C, 59402G/A), RANTES (-403G/A) and SDF-1 (3'801G/A) and mother-to-child HIV-1 transmission; plasma, cervical and breastmilk viral loads; or breastmilk chemokine concentrations.
Collapse
Affiliation(s)
- D A Katz
- Department of Epidemiology, University of Washington, Seattle, WA 98104, USA.
| | | | | | | | | | | | | |
Collapse
|
15
|
Singh KK, Spector SA. Host genetic determinants of human immunodeficiency virus infection and disease progression in children. Pediatr Res 2009; 65:55R-63R. [PMID: 19190524 PMCID: PMC2802664 DOI: 10.1203/pdr.0b013e31819dca03] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Increasing data support host genetic factors as an important determinants of human immunodeficiency virus type-1 (HIV-1) susceptibility, mother-to-child transmission (MTCT), and disease progression. Of these genetic mediators, those impacting innate and adaptive immune responses seem to play a critical role in viral infectivity and pathogenesis. During primary infection, CCR5 using virus is predominantly transmitted and polymorphisms that affect the expression of CCR5 alter the risk for MTCT and rate of disease. Chemokines that naturally bind to coreceptors alter infectivity and viral pathogenesis. Additional genes that affect innate immunity including those encoding for MBL2 and those modulating the adaptive immune response including CX3CR1 and human leukocyte antigen types can significantly modify susceptibility and response to HIV-1 infection. As young children develop, the dependence on certain arms of the immune system varies and can alter the effect of genetic variants. Additionally, host genetic factors may alter the response to antiretrovirals. Finally, because HIV-infected children progress more rapidly than adults and have fewer background cofactors, such as drug use and coinfections, the effects of host factors on HIV-1 disease may be more clearly identified. In this review, we summarize available data on the impact of host genetics on MTCT and disease progression of HIV-infected children.
Collapse
Affiliation(s)
- Kumud K Singh
- Department of Pediatrics, University of California, San Diego, La Jolla, California 92093, USA
| | | |
Collapse
|
16
|
Association between HLA-G 3'UTR 14-bp polymorphism and HIV vertical transmission in Brazilian children. AIDS 2009; 23:177-82. [PMID: 19098486 DOI: 10.1097/qad.0b013e32832027bf] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
OBJECTIVES The aim of our study was to verify the possible association between an HLA-G 14-bp deletion/insertion polymorphism and perinatal HIV transmission in Brazilian children. DESIGN We analyzed the 14-bp deletion/insertion polymorphisms in seronegative (i.e., exposed uninfected, N = 71) and seropositive (exposed infected, N = 175) Brazilian children born from HIV-positive mothers and in healthy controls (n = 175). METHODS HLA-G 14-bp deletion/insertion polymorphism (rs16375) was detected by PCR amplification of the target sequence followed by agarose gel electrophoresis. All the samples were also analyzed by direct sequencing in order to validate the genotyping results. RESULTS HIV-exposed uninfected children showed significant differences in their allele and genotype frequencies of the HLA-G 14-bp polymorphism when compared to both seropositive children and healthy controls. The 14-bp-deleted (D) allele was more frequent in exposed uninfected children (79%) than in healthy controls (60%) and HIV-positive children (58%); the higher percentage of the D allele found in the exposed uninfected children with respect to HIV-positive individuals was significantly associated with a reduced risk of vertical transmission. This effect was ascribable to the presence of the D/D homozygous genotype. CONCLUSION Our findings support the possible role for the HLA-G 14-bp deletion/insertion polymorphism in the HIV vertical transmission in Brazilian children. The presence of the D allele and D/D genotype is associated with a protective effect toward HIV perinatal infection.
Collapse
|
17
|
Associations of chemokine receptor polymorphisms With HIV-1 mother-to-child transmission in sub-Saharan Africa: possible modulation of genetic effects by antiretrovirals. J Acquir Immune Defic Syndr 2008; 49:259-65. [PMID: 18845960 DOI: 10.1097/qai.0b013e318186eaa4] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND HIV-1 mother-to-child transmission (MTCT) remains an important route of infection in sub-Saharan Africa. METHODS Genetic variants in CCR5 promoter, CCR2, CX3CR1, and Stromal cell-derived factor-1 (SDF-1) genes were determined in 980 infants from sub-Saharan Africa using real-time polymerase chain reaction to determine association with MTCT. RESULTS In antiretroviral-naive mother-infant pairs (n = 637), CCR5 promoter polymorphisms at positions 59029: A allele vs. G/G [odds ratio (OR): 1.61, 95% confidence interval (CI): 1.04 to 2.48; P = 0.032] and 59356: T allele vs. C/C (OR: 0.63, 95% CI: 0.41 to 0.96; P = 0.033) and CCR2-180: G allele vs. A/A (OR: 3.32, 95% CI: 1.13 to 9.73; P = 0.029) were associated with risk of MTCT. Treatment of HIV-1-infected mothers and infants with single-dose nevirapine or perinatal zidovudine altered but did not eliminate the association of genetic variants with MTCT. CONCLUSIONS CCR5 promoter, CCR2, and CX3CR1 polymorphisms were associated with risk of MTCT likely through their role as an HIV-1 coreceptor or by modulating the early immune response. Host genetics may continue to alter MTCT when short-course interventions that only partially suppress virus are used. These findings will need to be confirmed in validation cohorts with a large number of infected infants.
Collapse
|
18
|
Ahmad N. Molecular Mechanisms of HIV-1 Vertical Transmission and Pathogenesis in Infants. HIV-1: MOLECULAR BIOLOGY AND PATHOGENESIS 2008; 56:453-508. [DOI: 10.1016/s1054-3589(07)56015-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
|
19
|
|
20
|
. CA, . BA. Ecology and Antibacterial Potential of Lactic Acid Bacteria Associated with Fermented Cereals and Cassava. ACTA ACUST UNITED AC 2007. [DOI: 10.3923/jm.2007.426.435] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
21
|
Kremer KN, Kumar A, Hedin KE. Haplotype-independent costimulation of IL-10 secretion by SDF-1/CXCL12 proceeds via AP-1 binding to the human IL-10 promoter. THE JOURNAL OF IMMUNOLOGY 2007; 178:1581-8. [PMID: 17237407 PMCID: PMC2905171 DOI: 10.4049/jimmunol.178.3.1581] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Costimulation by the chemokine, stromal cell-derived factor-1 (SDF-1)/CXCL12, has been shown to increase the amount of IL-10 secreted by TCR-stimulated human T cells; however, the molecular mechanisms of this response are unknown. Knowledge of this signaling pathway may be useful because extensive evidence indicates that deficient IL-10 secretion promotes autoimmunity. The human IL-10 locus is highly polymorphic. We report in this study that SDF-1 costimulates IL-10 secretion from T cells containing all three of the most common human IL-10 promoter haplotypes that are identified by single-nucleotide polymorphisms at -1082, -819, and -592 bp (numbering is relative to the transcription start site). We further show that SDF-1 primarily costimulates IL-10 secretion by a diverse population of CD45RA(-) ("memory") phenotype T cells that includes cells expressing the presumed regulatory T cell marker, Foxp3. To address the molecular mechanisms of this response, we showed that SDF-1 costimulates the transcriptional activities in normal human T cells of reporter plasmids containing 1.1 kb of all three of the common IL-10 promoter haplotypes. IL-10 promoter activity was ablated by mutating two nonpolymorphic binding sites for the AP-1 transcription factor, and chromatin immunoprecipitation assays of primary human T cells revealed that SDF-1 costimulation enhances AP-1 binding to both of these sites. Together, these results delineate the molecular mechanisms responsible for SDF-1 costimulation of T cell IL-10 secretion. Because it is preserved among several human haplotypes and in diverse T cell populations including Foxp3(+) T cells, this pathway of IL-10 regulation may represent a key mechanism for modulating expression of this important immunoregulatory cytokine.
Collapse
Affiliation(s)
| | | | - Karen E. Hedin
- Direct correspondence to: Dr. Karen E. Hedin, Mayo Clinic, Department of Immunology, Guggenheim Building 3rd Floor, 200 First Street Southwest, Rochester, MN 55905, PH: 507-284-6441, FAX: 507-284-1637,
| |
Collapse
|
22
|
Montano M, Rarick M, Sebastiani P, Brinkmann P, Russell M, Navis A, Wester C, Thior I, Essex M. Gene-expression profiling of HIV-1 infection and perinatal transmission in Botswana. Genes Immun 2006; 7:298-309. [PMID: 16691187 PMCID: PMC7091840 DOI: 10.1038/sj.gene.6364297] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Perinatal transmission of human immunodeficiency virus (HIV)-1 represents a major problem in many regions of the world, especially Southern Africa. With the exception of viral and proviral load, the role for maternal cofactors in perinatal transmission outcome is largely unknown. In this study, an assessment was made of peripheral blood mononuclear cells (PBMC) gene-expression profiles to better understand transcriptional changes associated with HIV-1 infection and perinatal transmission among young adult mothers with infants in Botswana. Peripheral blood mononuclear cells specimens were used from 25 HIV+ drug naive and 20 HIV- healthy mothers, similar in age and location, collected in 1999-2000 and 2003, and processed with the exact same methods, as previously described. Expression profiling of 22 277 microarray gene probes implicated a broad initiation of innate response gene-sets, including toll-like receptor, interferon-stimulated and antiviral RNA response pathways in association with maternal HIV-1 infection. Maternal transmission status was further associated with host genes that influence RNA processing and splicing patterns. In addition to real-time polymerase chain reaction validation of specific genes, enriched category validation of PBMC profiles was conducted using two independent data sets for either HIV-1 infection or an unrelated RNA virus, severe acute respiratory virus infection. HIV-1 pathogen-specific host profiles should prove a useful tool in infection and transmission intervention efforts worldwide.
Collapse
Affiliation(s)
- M Montano
- Center for HIV-1/AIDS Care and Research, Boston University School of Medicine, MA 2446, USA.
| | | | | | | | | | | | | | | | | |
Collapse
|
23
|
Petersen DC, Glashoff RH, Shrestha S, Bergeron J, Laten A, Gold B, van Rensburg EJ, Dean M, Hayes VM. Risk for HIV-1 infection associated with a common CXCL12 (SDF1) polymorphism and CXCR4 variation in an African population. J Acquir Immune Defic Syndr 2006; 40:521-6. [PMID: 16284526 PMCID: PMC1369993 DOI: 10.1097/01.qai.0000186360.42834.28] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
CXC chemokine ligand 12 (CXCL12), or stromal cell-derived factor 1 (SDF1), is the only known natural ligand for the HIV-1 coreceptor, CXC chemokine receptor 4 (CXCR4). A single nucleotide polymorphism (SNP) in the CXCL12 gene (SDF1-3'A) has been associated with disease progression to AIDS in some studies, but not others. Mutations in the CXCR4 gene are generally rare and have not been implicated in HIV-1/AIDS pathogenesis. This study analyzed the SDF1-3'A SNP and performed mutation screening for polymorphic markers in the CXCR4 gene to determine the presence or absence of significant associations with susceptibility to HIV-1 infection. The study consisted of 257 HIV-1-seropositive patients and 113 HIV-1-seronegative controls representing a sub-Saharan African population belonging to the Xhosa ethnic group of South Africa. The SDF1-3'A SNP was associated with an increased risk for HIV-1 infection (P = 0.0319) whereas no significant association was observed between the occurrence of the SDF1-3'A SNP and increased or decreased plasma levels of CXCL12. Comprehensive mutation analysis of the CXCR4 gene confirmed a high degree of genetic conservation within the coding region of this ancient population.
Collapse
Affiliation(s)
| | | | - Sadeep Shrestha
- Department of Epidemiology, School of Public Health, University of Alabama at Birmingham, Birmingham, AL; and
| | - Julie Bergeron
- Basic Research Program, Science Applications International Corporation (SAIC), Frederick, MD
| | | | - Bert Gold
- Laboratory of Genomic Diversity, National Cancer Institute, Frederick, MD
| | | | - Michael Dean
- Laboratory of Genomic Diversity, National Cancer Institute, Frederick, MD
| | - Vanessa M. Hayes
- Urology, University of Stellenbosch, Tygerberg Medical School, South Africa
- Cancer Research Program, Garvan Institute of Medical Research, Darlinghurst, Sydney, New South Wales, Australia
- Reprints: Vanessa M. Hayes, Cancer Research Program, Garvan Institute of Medical Research, 384 Victoria Street, Darlinghurst, NSW 2010, Australia (e-mail:)
| |
Collapse
|
24
|
Kaslow RA, Dorak T, Tang JJ. Influence of host genetic variation on susceptibility to HIV type 1 infection. J Infect Dis 2005; 191 Suppl 1:S68-77. [PMID: 15630678 DOI: 10.1086/425269] [Citation(s) in RCA: 110] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
For this review of genetic susceptibility to human immunodeficiency virus type 1 infection, far more information was available on factors involved in acquisition of the virus by an uninfected "recipient" than on propagation by the infected "donor." Genetic variation presumably alters transmission from an infected host primarily by regulating the replication of virus and the concentration of particles circulating in blood and mucosal secretions of the potential donor. Thus, the effects of host genetic variation on transmission are inextricably bound to the well-established and powerful effects on virus load at different stages of infection. Teasing apart the effects in both donors and recipients has been and will continue to be quite difficult.
Collapse
Affiliation(s)
- Richard A Kaslow
- Department of Epidemiology, University of Alabama at Birmingham, AL 35294, USA.
| | | | | |
Collapse
|
25
|
Koning FA, Jansen CA, Dekker J, Kaslow RA, Dukers N, van Baarle D, Prins M, Schuitemaker H. Correlates of resistance to HIV-1 infection in homosexual men with high-risk sexual behaviour. AIDS 2004; 18:1117-26. [PMID: 15166527 DOI: 10.1097/00002030-200405210-00005] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVE To investigate possible correlates of HIV resistance in participants from the Amsterdam Cohort of Homosexual men who have remained HIV seronegative despite high-risk sexual behaviour. DESIGN/METHODS We studied in vitro HIV-1 susceptibility and adaptive and innate immunity in 29 high-risk seronegative (HRSN) and 15 HIV-negative pre-seroconversion (pre-SC) homosexual men from the same Amsterdam Cohort Study (ACS) who seroconverted to HIV-1 positive during active follow-up. Host genetics were compared between HRSN and HIV-positive ACS participants. RESULTS We found lower in vitro susceptibility for a CCR5-using (R5) HIV-1 variant, higher RANTES production levels, but no difference in coreceptor expression in HRSN as compared with pre-SC controls. Reduced R5 in vitro susceptibility of two HRSN tested was restored to normal levels by addition of antibodies against beta-chemokines. A higher proportion of HRSN carried the SDF-1 3'A variant and HLA-A*11, A*31 and Cw*15 alleles. ELIspot analysis with HIV-1 peptide stimulation revealed low frequencies of HIV-1-specific CD8 interferon-gamma producing cytotoxic T cells in both HRSN and pre-SC controls. CONCLUSIONS Low in vitro R5 susceptibility of cells from the HRSN men was due to beta-chemokine mediated inhibition of virus replication. The presence of HIV-1 specific cytotoxic T cells in both HRSN and pre-SC participants may signify exposure to the virus rather than protection from infection. Host genetic characteristics and other factors affecting innate immunity may contribute to differential resistance to HIV-1 infection among exposed seronegative individuals.
Collapse
Affiliation(s)
- Fransje A Koning
- Department of Clinical Viro Immunology, Sanquin Research at CLB and Landsteiner Laboratory of the Academic Medical Centre, University of Amsterdam, The Netherlands
| | | | | | | | | | | | | | | |
Collapse
|
26
|
Farquhar C, John-Stewart G. The role of infant immune responses and genetic factors in preventing HIV-1 acquisition and disease progression. Clin Exp Immunol 2004; 134:367-77. [PMID: 14632739 PMCID: PMC1808883 DOI: 10.1111/j.1365-2249.2003.02292.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Affiliation(s)
- C Farquhar
- Department of Medicine, University of Washington, Seattle 98104-2499, USA.
| | | |
Collapse
|
27
|
Kourtis AP, Butera S, Ibegbu C, Belec L, Duerr A. Breast milk and HIV-1: vector of transmission or vehicle of protection? THE LANCET. INFECTIOUS DISEASES 2003; 3:786-93. [PMID: 14652204 DOI: 10.1016/s1473-3099(03)00832-6] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Transmission of HIV-1 to the infant through breastfeeding is a major cause of new paediatric HIV-1 infections worldwide. Although extended breastfeeding accounts for approximately 40% of infant HIV infections worldwide, most breastfed infants remain uninfected, despite prolonged and repeated exposure to HIV-1. Mechanisms associated with transmission of HIV-1 through breastfeeding and factors related to protection from such transmission remain poorly understood. Here we focus on the cellular origin of HIV in breast milk and on immune factors within the milk that may offer protection from transmission of HIV infection. The presence of innate immunity and induction of adaptive immunity against HIV is explored: in particular, specific antibodies, cellular responses, and their significance. The role of mucosal immune activation and epithelial integrity in HIV transmission is also addressed. We are of the opinion that advances in laboratory methods that study specific aspects of immunity will help open new areas of understanding of HIV transmission through breastfeeding and mechanisms of protection, and contribute to the development of novel prevention strategies.
Collapse
|
28
|
van Rij RP, Schuitemaker H. Host genetic factors in the clinical course of HIV-1 infection: chemokines and chemokine receptors. Public Health Genomics 2003; 5:88-101. [PMID: 12811024 DOI: 10.1159/000065169] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
The outcome of HIV-1 infection is highly variable: not all individuals exposed to HIV-1 will become infected, and among individuals who do become infected, the time from seroconversion to AIDS diagnosis is highly variable. Some patients may develop AIDS within 3 years, whereas others may remain asymptomatic for over 15 years. The reasons for these differences are not fully understood, but are thought to reflect the complex interactions between virus and host. In recent years, an important role for host genetic factors in the pathogenesis of HIV-1 infection has increasingly been appreciated. Many novel genetic polymorphisms have been identified and analyzed for their role in HIV-1 transmission and disease progression. In this review, we will give an update of the current knowledge on the role of such polymorphisms in HIV-1 disease. As recent research in this field has focussed on polymorphisms in chemokine and chemokine receptor genes, this will be the main theme of our review.
Collapse
Affiliation(s)
- Ronald P van Rij
- Department of Clinical Viro-Immunology, CLB Sanquin and the Laboratory of Experimental and Clinical Immunology of the University of Amsterdam, Amsterdam, The Netherlands
| | | |
Collapse
|
29
|
Affiliation(s)
- David Burgner
- School of Paediatrics and Child Health, University of Western Australia, Princess Margaret Hospital for Children, Perth, Western Australia
| | | |
Collapse
|
30
|
Human Genetics and Human Sepsis: Is the Tail Wagging the Dog. Intensive Care Med 2003. [DOI: 10.1007/978-1-4757-5548-0_5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
31
|
Abstract
In the 20 years since the first description of the clinical manifestations of HIV infection, more than 32 million people have been infected worldwide. In untreated HIV-infected pregnant women, the risk of maternal-child transmission varies from 16 to 40%. In developed countries, utilizing combinations of available medications and elective cesarean sections, it is possible to lower the transmission rates to less than 2 to 4%. Effective programs use universal screening of pregnant women, perinatal antiretroviral therapy, and, at times, delivery via elective cesarean section. In resource-poor areas, major barriers remain to the control of maternal-child transmission.
Collapse
Affiliation(s)
- R M Rutstein
- Division of General Pediatrics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania19104, USA.
| |
Collapse
|
32
|
Genetic Determinants of Pediatric HIV-1 Infection: Vertical Transmission and Disease Progression Among Children. Mol Med 2001. [DOI: 10.1007/bf03401864] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
|
33
|
Affiliation(s)
- S Rowland-Jones
- Human Immunology Unit, Institute of Molecular Medicine, John Radcliffe Hospital, OX3 9DS, Oxford, United Kingdom.
| | | | | |
Collapse
|
34
|
Affiliation(s)
- S A Spector
- Department of Pediatrics, Division of Infectious Diseases, University of California-San Diego, Stein Clinical Research Building, 9500 Gilman Drive, La Jolla, California 92093-0672, USA.
| |
Collapse
|
35
|
Abstract
An understanding of the central events in the transmission of HIV-1 infection is critical to the development of effective strategies to prevent infection. Although the main routes of transmission have been known for some time, surprisingly little is known about the factors that influence the likelihood of transmitting or acquiring HIV-1 infection. Once infection has taken place, the series of virological and immunopathological events that constitute primary HIV-1 infection are thought to be closely linked with the subsequent clinical course of the infected person. Recent studies have provided some support for the notion that intervention with aggressive anti-retroviral drug therapy at this stage has the potential to prevent some of the damage to the immune system that will otherwise develop in the vast majority of infected people.
Collapse
Affiliation(s)
- P Hansasuta
- Human Immunology Unit, Institute of Molecular Medicine, John Radcliffe Hospital, Oxford, UK
| | | |
Collapse
|
36
|
|