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http://purl.uniprot.org/citations/10919597http://www.w3.org/1999/02/22-rdf-syntax-ns#typehttp://purl.uniprot.org/core/Journal_Citation
http://purl.uniprot.org/citations/10919597http://www.w3.org/2000/01/rdf-schema#comment"

Background

4-1BB (CD137) is a T cell costimulatory molecule that promotes T cell activation. In this study, we investigated the role of 4-1BB costimulation in allogeneic T cell responses.

Methods

Vascularized heart transplantation, allogeneic mixed leukocyte reaction (MLR), and graft versus host disease models were used to examine 4-1BB and 4-1BBL expression. In addition, agonistic anti-4-1BB antibodies were used in MLR to functionally analyze T cell responses.

Results

Using a heart transplant model, we found that 4-1BB and 4-1BBL transcripts were both expressed in rejecting cardiac grafts. In the allogeneic MLR, 4-1BB was expressed on both activated CD4 and CD8 T cells and 4-1BB was expressed on T cells after multiple cell divisions in vivo. Functionally, 4-1BB was a potent stimulator of proliferation, cytokine secretion, and CD25 expression by CD8 T cells, but 4-1BB signals had a weak effect on the proliferation of CD4 T cells. Because 4-1BB promoted the secretion of IL-2 and the expression of CD25 on CD8 T cells, we investigated whether IL-2 was the only factor whereby 4-1BB signals induced CD8 T cell proliferation. Although IL-2 was required for optimal CD8 T cell proliferation, 4-1BB also costimulated CD8 T cell proliferation independently of IL-2.

Conclusions

This study demonstrates that 4-1BB is expressed on activated, maximally divided T cells and shows that 4-1BB promotes CD8 T cell proliferation by enhancing signals through the IL-2 receptor and by other mechanisms independent of the IL-2 pathway."xsd:string
http://purl.uniprot.org/citations/10919597http://purl.uniprot.org/core/author"Ha J."xsd:string
http://purl.uniprot.org/citations/10919597http://purl.uniprot.org/core/author"Tucker-Burden C."xsd:string
http://purl.uniprot.org/citations/10919597http://purl.uniprot.org/core/author"Cho H.R."xsd:string
http://purl.uniprot.org/citations/10919597http://purl.uniprot.org/core/author"Tan J.T."xsd:string
http://purl.uniprot.org/citations/10919597http://purl.uniprot.org/core/author"Larsen C.P."xsd:string
http://purl.uniprot.org/citations/10919597http://purl.uniprot.org/core/author"Pearson T.C."xsd:string
http://purl.uniprot.org/citations/10919597http://purl.uniprot.org/core/author"Mittler R.S."xsd:string
http://purl.uniprot.org/citations/10919597http://purl.uniprot.org/core/author"Hendrix R.C."xsd:string
http://purl.uniprot.org/citations/10919597http://purl.uniprot.org/core/date"2000"xsd:gYear
http://purl.uniprot.org/citations/10919597http://purl.uniprot.org/core/name"Transplantation"xsd:string
http://purl.uniprot.org/citations/10919597http://purl.uniprot.org/core/pages"175-183"xsd:string
http://purl.uniprot.org/citations/10919597http://purl.uniprot.org/core/title"Analysis of expression and function of the costimulatory molecule 4-1BB in alloimmune responses."xsd:string
http://purl.uniprot.org/citations/10919597http://purl.uniprot.org/core/volume"70"xsd:string
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