RESUMO
<p><b>Objective</b>To analyze the gene expression profiling characteristics of peripheral blood mononuclear cells (PBMCs) from patients with secondary syphilis, and gain an insight into the host molecular immune mechanisms involved in Treponema pallidum infection.</p><p><b>METHODS</b>Using genome-based high-throughput Illumina sequencing technology, we comprehensively determined the transcriptional difference in PBMCs from 4 secondary syphilis patients and 4 healthy controls, followed by real time PCR to validate the results of Illumina sequencing.</p><p><b>RESULTS</b>Totally, 78 differentially expressed genes were found in the PBMCs of the secondary syphilis patients, among which 16 were associated with the immune system. Significant upregulation was observed in the expressions of pro-inflammatory cytokines and related receptors, such as TNF receptor super-family member 17 (TNFRSF17), IL-17C, IL-21, IL-31 receptor A (IL-31RA), chemokine C-X-C motif ligand 10 (CXCL10), and chemokine (C-C motif) ligand 1 (CCL1), as well as the transcripts for the CD4+ T lymphocytes activation markers CD38, Fc-mediated phagocytosis receptors (FcγR1A, FcγR3B), and complement (C2, SERPING1).</p><p><b>CONCLUSIONS</b>Systemic innate and adaptive immune effecter molecules are involved in the host clearance mechanism of secondary syphilis.</p>
RESUMO
CD47 is a ubiquitously expressed transmembrane glycoprotein on surface of many cells. Through its interaction with integrin, signal regulatory protein alpha (SIRPα) and thrombin sensitive protein-1 (TSP-1), it plays important roles in various immunological processes including inflammatory response, immune response and tumor immunity. Recently, it has been found that CD47 interacts with SIRPα expressed on phagocytic cells, which transfers a negative signal when being activated. By the mechanisms described above, CD47-SIRPα signal complex is involved in the pathogenesis of hematological diseases and might provide some informations for the therapy of patients. This review focuses on the structure and immunoregulatory functions of CD47, the mechanism of CD47 in tumor therapy, the CD47 and hematologic malignancies including acute leukemia, B-cell lymphoma and multiple myeloma, as well as CD47 and hematopoietic stem cell transplantation.