Recruitment of Antigen-Presenting Cells to the Site of Inoculation and Augmentation of Human Immunodeficiency Virus Type 1 DNA Vaccine Immunogenicity by In Vivo Electroporation

ABSTRACT In vivo electroporation (EP) has been shown to augment the immunogenicity of plasmid DNA vaccines, but its mechanism of action has not been fully characterized. In this study, we show that in vivo EP augmented cellular and humoral immune responses to a human immunodeficiency virus type 1 Env DNA vaccine in mice and allowed a 10-fold reduction in vaccine dose. This enhancement was durable for over 6 months, and re-exposure to antigen resulted in anamnestic effector and central memory CD8+ T-lymphocyte responses. Interestingly, in vivo EP also recruited large mixed cellular inflammatory infiltrates to the site of inoculation. These infiltrates contained 45-fold-increased numbers of macrophages and 77-fold-increased numbers of dendritic cells as well as 2- to 6-fold-increased numbers of B and T lymphocytes compared to infiltrates following DNA vaccination alone. These data suggest that recruiting inflammatory cells, including antigen-presenting cells (APCs), to the site of antigen production substantially improves the immunogenicity of DNA vaccines. Combining in vivo EP with plasmid chemokine adjuvants that similarly recruited APCs to the injection site, however, did not result in synergy.

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Lentiviral vectors containing the human immunodeficiency virus type-1 central polypurine tract can efficiently transduce nondividing hepatocytes and antigen-presenting cells in vivo

Blood ◽

10.1182/blood.v100.3.813 ◽

2002 ◽

Vol 100 (3) ◽

pp. 813-822 ◽

Cited By ~ 183

Author(s):

Thierry VandenDriessche ◽

Lieven Thorrez ◽

Luigi Naldini ◽

Antonia Follenzi ◽

Lieve Moons ◽

...

Keyword(s):

Human Immunodeficiency Virus ◽

Gene Transfer ◽

Human Immunodeficiency Virus Type ◽

Virus Type ◽

Lentiviral Vectors ◽

Lentiviral Transduction ◽

Immunodeficiency Virus ◽

Antigen Presenting

Abstract High-titer self-inactivating human immunodeficiency virus type-1 (HIV-1)–based vectors expressing the green fluorescent protein reporter gene that contained the central polypurine and termination tract and the woodchuck hepatitis virus posttranscriptional regulatory element were constructed. Transduction efficiency and biodistribution were determined, following systemic administration of these improved lentiviral vectors. In adult severe combined immunodeficiency (SCID) mice, efficient stable gene transfer was achieved in the liver (8.0% ± 6.0%) and spleen (24% ± 3%). Most transduced hepatocytes and nonhepatocytes were nondividing, thereby obviating the need to induce liver cell proliferation. In vivo gene transfer with this improved lentiviral vector was relatively safe since liver enzyme concentration in the plasma was only moderately and transiently elevated. In addition, nondividing major histocompatibility complex class II–positive splenic antigen-presenting cells (APCs) were efficiently transduced in SCID and normal mice. Furthermore, B cells were efficiently transduced, whereas T cells were refractory to lentiviral transduction in vivo. However, in neonatal recipients, lentiviral transduction was more widespread and included not only hepatocytes and splenic APCs but also cardiomyocytes. The present study suggests potential uses of improved lentiviral vectors for gene therapy of genetic blood disorders resulting from serum protein deficiencies, such as hemophilia, and hepatic disease. However, the use of liver-specific promoters may be warranted to circumvent inadvertent transgene expression in APCs. In addition, these improved lentiviral vectors could potentially be useful for genetic vaccination and treatment of perinatal cardiac disorders.

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Independent fluctuation of human immunodeficiency virus type 1 rev and gp41 quasispecies in vivo.

Journal of Virology ◽

10.1128/jvi.65.8.4502-4507.1991 ◽

1991 ◽

Vol 65 (8) ◽

pp. 4502-4507 ◽

Cited By ~ 24

Author(s):

L P Martins ◽

N Chenciner ◽

B Asjö ◽

A Meyerhans ◽

S Wain-Hobson

Keyword(s):

Human Immunodeficiency Virus ◽

Human Immunodeficiency Virus Type ◽

Virus Type ◽

Immunodeficiency Virus

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Allogeneic leukocytes but not therapeutic blood elements induce reactivation and dissemination of latent human immunodeficiency virus type 1 infection: implications for transfusion support of infected patients

Blood ◽

10.1182/blood.v80.8.2128.2128 ◽

1992 ◽

Vol 80 (8) ◽

pp. 2128-2135 ◽

Cited By ~ 74

Author(s):

MP Busch ◽

TH Lee ◽

J Heitman

Keyword(s):

Human Immunodeficiency Virus ◽

Human Immunodeficiency Virus Type ◽

Virus Type ◽

Blood Components ◽

Route Of Transmission ◽

Immunodeficiency Virus ◽

Hiv 1 ◽

Donor Lymphocytes

Abstract Various immunologic stimuli and heterologous viral regulatory elements have been shown to increase susceptibility to, and replication of, human immunodeficiency virus type 1 (HIV-1) in lymphocytes and monocytes in vitro. Transfusion of allogeneic blood components from heterologous donors constitutes a profound immunologic stimulus to the recipient, in addition to being a potential route of transmission of lymphotropic viral infections. To investigate the hypothesis that transfusions, and particularly those containing leukocytes, activate HIV-1 replication in infected recipient cells, we cocultured peripheral blood mononuclear cells (PBMC) from three anti-HIV-1-positive individuals with allogeneic donor PBMC, as well as partially purified populations of donor lymphocytes, monocytes, granulocytes, platelets, and red blood cells (RBC) and allogeneic cell-free plasma. Allogeneic PBMC induced a dose-related activation of HIV-1 expression in in vivo infected cells, followed by dissemination of HIV-1 to previously uninfected patient cells. Activation of HIV-1 replication was observed with donor lymphocytes, monocytes, and granulocytes, whereas no effect was seen with leukocyte-depleted RBC, platelets, or plasma (ie, therapeutic blood constituents). Allogeneic donor PBMC were also shown to upregulate HIV-1 expression in a “latently” infected cell line, and to increase susceptibility of heterologous donor PBMC to acute HIV-1 infection. Studies should be performed to evaluate whether transfusions of leukocyte-containing blood components accelerate HIV-1 dissemination and disease progression in vivo. If so, HIV-1-infected patients should be transfused as infrequently as possible and leukocyte-depleted (filtered) blood components should be used to avoid this complication.

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Enhanced immunogenicity using an alphavirus replicon DNA vaccine against human immunodeficiency virus type 1

Journal of General Virology ◽

10.1099/vir.0.80481-0 ◽

2005 ◽

Vol 86 (2) ◽

pp. 349-354 ◽

Cited By ~ 35

Author(s):

Eva K. L. Nordström ◽

Mattias N. E. Forsell ◽

Christina Barnfield ◽

Eivor Bonin ◽

Tomas Hanke ◽

...

Keyword(s):

Human Immunodeficiency Virus ◽

T Cell ◽

Dna Vaccine ◽

Human Immunodeficiency Virus Type ◽

Virus Type ◽

Semliki Forest Virus ◽

Cell Responses ◽

Immunodeficiency Virus ◽

Hiv 1

With the human immunodeficiency virus type 1 (HIV-1) epidemic expanding at increasing speed, development of a safe and effective vaccine remains a high priority. One of the most central vaccine platforms considered is plasmid DNA. However, high doses of DNA and several immunizations are typically needed to achieve detectable T-cell responses. In this study, a Semliki Forest virus replicon DNA vaccine designed for human clinical trials, DREP.HIVA, encoding an antigen that is currently being used in human trials in the context of a conventional DNA plasmid, pTHr.HIVA, was generated. It was shown that a single immunization of DREP.HIVA stimulated HIV-1-specific T-cell responses in mice, suggesting that the poor immunogenicity of conventional DNA vaccines may be enhanced by using viral replicon-based plasmid systems. The results presented here support the evaluation of Semliki Forest virus replicon DNA vaccines in non-human primates and in clinical studies.

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The Interaction of Vpr with Uracil DNA Glycosylase Modulates the Human Immunodeficiency Virus Type 1 In Vivo Mutation Rate

Journal of Virology ◽

10.1128/jvi.74.15.7039-7047.2000 ◽

2000 ◽

Vol 74 (15) ◽

pp. 7039-7047 ◽

Cited By ~ 126

Author(s):

Louis M. Mansky ◽

Sandra Preveral ◽

Luc Selig ◽

Richard Benarous ◽

Serge Benichou

Keyword(s):

Human Immunodeficiency Virus ◽

Mutation Rate ◽

Human Immunodeficiency Virus Type ◽

Virus Type ◽

Dna Glycosylase ◽

Uracil Dna Glycosylase ◽

Immunodeficiency Virus ◽

Hiv 1

ABSTRACT The Vpr protein of human immunodeficiency virus type 1 (HIV-1) influences the in vivo mutation rate of the virus. Since Vpr interacts with a cellular protein implicated in the DNA repair process, uracil DNA glycosylase (UNG), we have explored the contribution of this interaction to the mutation rate of HIV-1. Single-amino-acid variants of Vpr were characterized for their differential UNG-binding properties and used to trans complement vpr null mutant HIV-1. A striking correlation was established between the abilities of Vpr to interact with UNG and to influence the HIV-1 mutation rate. We demonstrate that Vpr incorporation into virus particles is required to influence the in vivo mutation rate and to mediate virion packaging of the nuclear form of UNG. The recruitment of UNG into virions indicates a mechanism for how Vpr can influence reverse transcription accuracy. Our data suggest that distinct mechanisms evolved in primate and nonprimate lentiviruses to reconcile uracil misincorporation into lentiviral DNA.

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In vivo characteristics of human immunodeficiency virus type 1 intersubtype recombination: determination of hot spots and correlation with sequence similarity

Journal of General Virology ◽

10.1099/vir.0.19180-0 ◽

2003 ◽

Vol 84 (10) ◽

pp. 2715-2722 ◽

Cited By ~ 51

Author(s):

Gkikas Magiorkinis ◽

Dimitrios Paraskevis ◽

Anne-Mieke Vandamme ◽

Emmanouil Magiorkinis ◽

Vana Sypsa ◽

...

Keyword(s):

Human Immunodeficiency Virus ◽

Human Immunodeficiency Virus Type ◽

Virus Type ◽

Recombination Frequency ◽

Sequence Similarity ◽

Virus Species ◽

Immunodeficiency Virus ◽

Hiv 1

Recombination plays a pivotal role in the evolutionary process of many different virus species, including retroviruses. Analysis of all human immunodeficiency virus type 1 (HIV-1) intersubtype recombinants revealed that they are more complex than described initially. Recombination frequency is higher within certain genomic regions, such as partial reverse transcriptase (RT), vif/vpr, the first exons of tat/rev, vpu and gp41. A direct correlation was observed between recombination frequency and sequence similarity across the HIV-1 genome, indicating that sufficient sequence similarity is required upstream of the recombination breakpoint. This finding suggests that recombination in vivo may occur preferentially during reverse transcription through the strand displacement-assimilation model rather than the copy-choice model.

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