title: Silencing of SOCS1 enhances antigen presentation by dendritic cells and antigen-specific anti-tumor immunity.
abstract: Tumor vaccines represent a promising therapeutic approach, but thus far have achieved only limited success in the clinic. The major challenge is to find a means of overcoming inhibitory immune regulatory mechanisms and eliciting effective T-cell responses to antigens preferentially expressed by tumor cells. Here we show that the stimulatory capacity of dendritic cells (DCs) and the magnitude of adaptive immunity are critically regulated by the suppressor of cytokine signaling (SOCS) 1 in DCs. Silencing SOCS1 in antigen-presenting DCs strongly enhances antigen-specific anti-tumor immunity. Our findings indicate that SOCS1 represents an inhibitory mechanism for qualitatively and quantitatively controlling antigen presentation by DCs and the magnitude of adaptive immunity. This study has implications for understanding the regulation of antigen presentation and for developing more effective tumor vaccines by silencing the critical brake in antigen presentation.
authors.affiliation: Center for Cell and Gene Therapy, Baylor College of Medicine, One Baylor Plaza, Houston, Texas 77030, USA.
authors.forename: Lei
authors.initials: L
authors.lastname: Shen
authors.forename: Kevin
authors.initials: K
authors.lastname: Evel-Kabler
authors.forename: Randy
authors.initials: R
authors.lastname: Strube
authors.forename: Si-Yi
authors.initials: SY
authors.lastname: Chen
mesh_terms: D000818:Animals; D017951:Antigen Presentation / Q000235:genetics / Q000276:immunology*; D002352:Carrier Proteins / Q000235:genetics* / Q000378:metabolism*; D002454:Cell Differentiation; D045744:Cell Line, Tumor; D003713:Dendritic Cells / Q000166:cytology* / Q000276:immunology* / Q000637:transplantation; D020868:Gene Silencing / Q000276:immunology; D016219:Immunotherapy, Adoptive / Q000379:methods*; D008545:Melanoma / Q000276:immunology* / Q000473:pathology / Q000628:therapy*; D051379:Mice; D008810:Mice, Inbred C57BL; D012097:Repressor Proteins / Q000235:genetics* / Q000378:metabolism*; D000071222:Suppressor of Cytokine Signaling 1 Protein; D050826:Suppressor of Cytokine Signaling Proteins
chemical_list: D002352:Carrier Proteins; D012097:Repressor Proteins; C491590:Socs1 protein, mouse; D000071222:Suppressor of Cytokine Signaling 1 Protein; D050826:Suppressor of Cytokine Signaling Proteins