Aptamer-Targeted Antigen Delivery.
Molecular therapy : the journal of the American Society of Gene Therapy
Images in clinical medicine. Bilateral digital ischemia.
The New England journal of medicine
2014; 370 (12): 1148
Portal Vein Thrombosis Following Laparoscopic Sleeve Gastrectomy for Morbid Obesity
JSLS-JOURNAL OF THE SOCIETY OF LAPAROENDOSCOPIC SURGEONS
2012; 16 (4): 639-643
Effective therapeutic vaccines often require activation of T cell-mediated immunity. Robust T cell activation, including CD8 T cell responses, can be achieved using antibodies or antibody fragments to direct antigens of interest to professional antigen presenting cells. This approach represents an important advance in enhancing vaccine efficacy. Nucleic acid aptamers present a promising alternative to protein-based targeting approaches. We have selected aptamers that specifically bind the murine receptor, DEC205, a C-type lectin expressed predominantly on the surface of CD8α+ dendritic cells (DCs) that has been shown to be efficient at facilitating antigen cross-presentation and subsequent CD8+ T cell activation. Using a minimized aptamer conjugated to the model antigen ovalbumin (OVA), DEC205-targeted antigen cross-presentation was verified in vitro and in vivo by proliferation and cytokine production by primary murine CD8+ T cells expressing a T cell receptor specific for the MHC I-restricted OVA257-264 peptide SIINFEKL. Compared with a nonspecific RNA of similar length, DEC205 aptamer-OVA-mediated antigen delivery stimulated strong proliferation and production of IFN-γ and IL-2. The immune responses elicited by aptamer-OVA conjugates were sufficient to inhibit growth of established OVA-expressing B16 tumor cells. Our results demonstrate a new application of aptamer technology for the development of effective T cell-mediated vaccines.Molecular Therapy (2014); doi:10.1038/mt.2014.51.
View details for DOI 10.1038/mt.2014.51
View details for PubMedID 24682172
Specific post-translational histone modifications of neutrophil extracellular traps as immunogens and potential targets of lupus autoantibodies
ARTHRITIS RESEARCH & THERAPY
2012; 14 (1)
Portal vein thrombosis has been documented after laparoscopic general surgery and has been uncommonly observed after laparoscopic bariatric surgery. Among bariatric operations, the sleeve gastrectomy is being performed with ever-increasing frequency. Here we report the case of a man who presented with portal vein thrombosis after laparoscopic sleeve gastrectomy.A 41-y-old man underwent an uneventful laparoscopic sleeve gastrectomy for the treatment of morbid obesity, and presented on postoperative day 10 with nonfocal abdominal pain, nausea, vomiting, and leukocytosis. Computed tomography revealed portal vein thrombosis, which was found in the setting of Clostridium difficile colitis.Portal vein thrombosis may be identified with increasing frequency as the number of laparoscopic bariatric operations continues to increase. A high index of suspicion is necessary to diagnose this rare, but potentially lethal, complication.
View details for DOI 10.4293/108680812X13517013316636
View details for Web of Science ID 000314201800023
View details for PubMedID 23484577
Specific post-translational histone modifications of neutrophil extracellular traps as immunogens and potential targets of lupus autoantibodies (vol 14, R25, 2012)
ARTHRITIS RESEARCH & THERAPY
2012; 14 (4)
Autoreactivity to histones is a pervasive feature of several human autoimmune disorders, including systemic lupus erythematosus (SLE). Specific post-translational modifications (PTMs) of histones within neutrophil extracellular traps (NETs) may potentially drive the process by which tolerance to these chromatin-associated proteins is broken. We hypothesized that NETs and their unique histone PTMs might be capable of inducing autoantibodies that target histones.We developed a novel and efficient method for the in vitro production, visualization, and broad profiling of histone-PTMs of human and murine NETs. We also immunized Balb/c mice with murine NETs and profiled their sera on autoantigen and histone peptide microarrays for evidence of autoantibody production to their immunogen.We confirmed specificity toward acetyl-modified histone H2B as well as to other histone PTMs in sera from patients with SLE known to have autoreactivity against histones. We observed enrichment for distinctive histone marks of transcriptionally silent DNA during NETosis triggered by diverse stimuli. However, NETs derived from human and murine sources did not harbor many of the PTMs toward which autoreactivity was observed in patients with SLE or in MRL/lpr mice. Further, while murine NETs were weak autoantigens in vivo, there was only partial overlap in the immunoglobulin G (IgG) and IgM autoantibody profiles induced by vaccination of mice with NETs and those seen in patients with SLE.Isolated in vivo exposure to NETs is insufficient to break tolerance and may involve additional factors that have yet to be identified.
View details for DOI 10.1186/ar3707
View details for Web of Science ID 000304698800039
View details for PubMedID 22300536