Abstract | BACKGROUND: The lack of a suitable animal model to study viral and immunological mechanisms of human dengue disease has been a deterrent to dengue research. METHODOLOGY/PRINCIPAL FINDINGS: We sought to establish an animal model for dengue virus (DENV) infection and immunity using non-obese diabetic/ severe combined immunodeficiency interleukin-2 receptor gamma-chain knockout (NOD-scid IL2rgamma(null)) mice engrafted with human hematopoietic stem cells. Human CD45(+) cells in the bone marrow of engrafted mice were susceptible to in vitro infection using low passage clinical and established strains of DENV. Engrafted mice were infected with DENV type 2 by different routes and at multiple time points post infection, we detected DENV antigen and RNA in the sera, bone marrow, spleen and liver of infected engrafted mice. Anti- dengue IgM antibodies directed against the envelope protein of DENV peaked in the sera of mice at 1 week post infection. Human T cells that developed following engraftment of HLA-A2 transgenic NOD-scid IL2rgamma(null) mice with HLA-A2(+) human cord blood hematopoietic stem cells, were able to secrete IFN-gamma, IL-2 and TNF-alpha in response to stimulation with three previously identified A2 restricted dengue peptides NS4b 2353((111-119)), NS4b 2423((181-189)), and NS4a 2148((56-64)). CONCLUSIONS/SIGNIFICANCE: This is the first study to demonstrate infection of human cells and functional DENV-specific T cell responses in DENV-infected humanized mice. Overall, these mice should be a valuable tool to study the role of prior immunity on subsequent DENV infections.
|
Authors | Smita Jaiswal, Todd Pearson, Heather Friberg, Leonard D Shultz, Dale L Greiner, Alan L Rothman, Anuja Mathew |
Journal | PloS one
(PLoS One)
Vol. 4
Issue 10
Pg. e7251
(Oct 05 2009)
ISSN: 1932-6203 [Electronic] United States |
PMID | 19802382
(Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
|
Chemical References |
- HLA-A2 Antigen
- Interleukin-2
- Peptides
- RNA
|
Topics |
- Animals
- Dengue
(immunology)
- Dengue Virus
(immunology)
- Fetal Blood
(cytology, virology)
- HLA-A2 Antigen
(immunology)
- Hematopoiesis
- Hematopoietic Stem Cells
(cytology, virology)
- Humans
- Interleukin-2
(immunology)
- Mice
- Mice, Inbred NOD
- Mice, Knockout
- Mice, SCID
(immunology)
- Peptides
(chemistry)
- RNA
(metabolism)
|