Title |
TLR4-dependent activation of dendritic cells by an HMGB1-derived peptide adjuvant
|
---|---|
Published in |
Journal of Translational Medicine, August 2014
|
DOI | 10.1186/1479-5876-12-211 |
Pubmed ID | |
Authors |
Rebecca Saenz, Diahnn Futalan, Lien Leutenez, Fien Eekhout, Jessie F Fecteau, Simeon Sundelius, Stig Sundqvist, Marie Larsson, Tomoko Hayashi, Boris Minev, Dennis Carson, Sadik Esener, Bradley Messmer, Davorka Messmer |
Abstract |
High mobility group box protein 1 (HMGB1) acts as an endogenous danger molecule that is released from necrotic cells and activated macrophages. We have previously shown that peptide Hp91, whose sequence corresponds to an area within the B-Box domain of HMGB1, activates dendritic cells (DCs) and acts as an adjuvant in vivo. Here we investigated the underlying mechanisms of Hp91-mediated DC activation. Hp91-induced secretion of IL-6 was dependent on clathrin- and dynamin-driven endocytosis of Hp91 and mediated through a MyD88- and TLR4-dependent pathway involving p38 MAPK and NFkappaB. Endosomal TLR4 has been shown to activate the MyD88-independent interferon pathway. Hp91-induced activation of pIRF3 and IL-6 secretion was reduced in IFNalphabetaR knockout DCs, suggesting an amplification loop via the IFNalphabetaR. These findings elucidate the mechanisms by which Hp91 acts as immunostimulatory peptide and may serve as a guide for the future development of synthetic Th1-type peptide adjuvants for vaccines. |
X Demographics
Geographical breakdown
Country | Count | As % |
---|---|---|
United Kingdom | 1 | 50% |
Unknown | 1 | 50% |
Demographic breakdown
Type | Count | As % |
---|---|---|
Science communicators (journalists, bloggers, editors) | 1 | 50% |
Members of the public | 1 | 50% |
Mendeley readers
Geographical breakdown
Country | Count | As % |
---|---|---|
United Kingdom | 1 | 2% |
Unknown | 48 | 98% |
Demographic breakdown
Readers by professional status | Count | As % |
---|---|---|
Student > Ph. D. Student | 8 | 16% |
Researcher | 8 | 16% |
Student > Master | 6 | 12% |
Other | 5 | 10% |
Student > Bachelor | 3 | 6% |
Other | 8 | 16% |
Unknown | 11 | 22% |
Readers by discipline | Count | As % |
---|---|---|
Biochemistry, Genetics and Molecular Biology | 12 | 24% |
Agricultural and Biological Sciences | 9 | 18% |
Immunology and Microbiology | 5 | 10% |
Medicine and Dentistry | 4 | 8% |
Chemistry | 2 | 4% |
Other | 8 | 16% |
Unknown | 9 | 18% |