Down-regulation of Human Granzyme B Expression by Glucocorticoids

Down-regulation of human granzyme B expression by glucocorticoids. Dexamethasone inhibits binding to the Ikaros and AP-1 regulatory elements of the granzyme B promoter.

The serine protease granzyme B is an essential component of the granule exocytosis pathway, a major apoptotic mechanism used by cytotoxic T lymphocytes and natural killer cells to induce target cell apoptosis. Granzyme B gene transcription is induced in activated lymphocytes upon antigenic stimulation, and several regulatory regions including CBF, AP-1, and Ikaros binding sites have been shown ...

Stable Down-Regulation of HLA Class-I by Serum Starvation in Human PBMCs

Background: The human leukocyte antigen (HLA) matching between organ donor and recipient is an acceptable strategy in clinical transplantation since 1964. However, in bone marrow transplantation, finding matched donors is often problematic. Thus new method for down regulation of HLA can be an alternative strategy to solve this problem. Objective: To examine the effect of serum starvation on HLA...

Granzyme B and perforin: constitutive expression in human polymorphonuclear neutrophils.

Polymorphonuclear neutrophils (PMNs) produce an abundance of bactericidal and cytotoxic molecules consistent with their role as first-line defense against bacterial infection. PMNs, however, also cause efficient cellular cytotoxicity when targeted through Fc receptors to appropriate antibody-coated target cells. Although this so-called antibody-dependent cellular cytotoxicity (ADCC) was describ...

Cathepsin B expression and down-regulation by gene silencing and antisense DNA in human chondrocytes.

Cathepsin B, a marker of the dedifferentiated chondrocyte phenotype, contributes to cartilage destruction in osteoarthritis and pathological proteolysis in rheumatoid arthritis and cancer. In search of possible means for neutralizing the action of this enzyme, we compared its expression, biosynthesis and distribution in articular chondrocytes and two lines of immortalized human chondrocytes. Na...

Down Regulation of DHFR Promoter Activity by PML Transcription Repressor