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In JoVE (1)
Other Publications (3)
Articles by Dan Lehmann in JoVE
Genome-wide Determination of Mammalian Replication Timing by DNA Content Measurement
Yishai Yehuda1, Britny Blumenfeld1, Dan Lehmann2, Itamar Simon1
1Dept. of Microbiology and Molecular Genetics, IMRIC, Faculty of Medicine, Hebrew University of Jerusalem, 2The Core Research Facility, IMRIC, Faculty of Medicine, Hebrew University of Jerusalem
Other articles by Dan Lehmann on PubMed
Extrapancreatic Autoimmune Manifestations in Type 1 Diabetes Patients and Their First-degree Relatives: a Multicenter Study
Diabetes Care. Apr, 2003 | Pubmed ID: 12663603
To investigate the prevalence of autoimmune diseases in young patients (probands) with type 1 diabetes and their first-degree relatives, and to determine the spectrum of extrapancreatic manifestations in these subjects.
Gamma-irradiation Enhances Apoptosis Induced by Cannabidiol, a Non-psychotropic Cannabinoid, in Cultured HL-60 Myeloblastic Leukemia Cells
Leukemia & Lymphoma. Oct, 2003 | Pubmed ID: 14692532
Two non-psychotropic cannabinoids, cannabidiol (CBD) and cannabidiol-dimethylheptyl (CBD-DMH), induced apoptosis in a human acute myeloid leukemia (AML) HL-60 cell line. Apoptosis was determined by staining with bisBenzimide and propidium iodide. A dose dependent increase of apoptosis was noted, reaching 61 and 43% with 8 microg/ml CBD and 15 microg/ml CBD-DMH, respectively, after a 24 h treatment. Prior exposure of the cells to gamma-irradiation (800 cGy) markedly enhanced apoptosis, reaching values of 93 and 95%, respectively. Human monocytes from normal individuals were resistant to either cannabinoids or gamma-irradiation. Caspase-3 activation was observed after the cannabinoid treatment, and may represent a mechanism for the apoptosis. Our data suggest a possible new approach to treatment of AML.
The Role of Skin-derived Dendritic Cells in CD8+ T Cell Priming Following Immunization with Lentivectors
Journal of Immunology (Baltimore, Md. : 1950). May, 2010 | Pubmed ID: 20357252
Although skin dendritic cells (DCs) have been shown to directly present Ag to CD8(+) T cells after intradermal immunization with lentivectors, the contribution of the different skin DC subsets to this process remains unclear. Using langerin-diphtheria toxin receptor transgenic mice we demonstrated that ablation of langerhans cells and langerin-expressing positive dermal DCs (Ln(+)dDCs) did not interfere with the generation of CD8(+) T cells by lentiviral vectors. Consistent with these findings, the absence of langerhans cells and Ln(+)dDCs did not hamper the presentation level of lentiviral-derived Ag by skin DCs in vitro. We further demonstrated that only dDCs and Ln(+)dDCs were capable of presenting Ag, however, the number of dDCs migrating to the draining lymph nodes was 6-fold higher than that of Ln(+)dDCs. To study how the duration of DC migration influences CD8(+) T cell responses, we analyzed the kinetics of Ag expression at the injection site and manipulated DC migration by excising the injected skin at various times after immunization. A low level of Ag expression was seen 1 wk after the immunization; peaked during week 2, and was considerably cleared by week 3 via a perforin-dependent fas-independent mechanism. Removing the injection site 3 or 5 d, but not 10 d, after the immunization, resulted in a reduced CD8(+) T cell response. These findings suggest that dDCs are the main APCs active after intradermal lentiviral-mediated immunization, and migration of dDCs in the initial 10-d period postimmunization is required for optimal CD8(+) T cell induction.