Anti-CYB5B Antibody Picoband® Fluoro488 Conjugated

CYB5B (Cytochrome b5 type B) is also named as CYB5M, OMB5 and belongs to the cytochrome b5 family. It is a 21 kDa membrane bound hemoprotein which function as an electron carrier for several membrane bound oxygenases. This protein is expressed on the plasma membrane of lymphoma cells but not normal lymphocytes, reactive lymphocytes or bone marrow precursor cells. The full length protein has a propeptide with 11 amino acids.

Expressed in immune system and fetal brain, but not in other tissues tested or in multiple hematopoietic cell lines. Predominantly expressed in skin keratinocytes but not in fibroblasts, endothelial cells or melanocytes. Increased in lesional psoriasis skin.

Cytokine that binds to and signals through the IL1RL2/IL-36R receptor which in turn activates NF-kappa-B and MAPK signaling pathways in target cells linked to a pro-inflammatory response. Part of the IL-36 signaling system that is thought to be present in epithelial barriers and to take part in local inflammatory response; similar to the IL-1 system with which it shares the coreceptor IL1RAP. Seems to be involved in skin inflammatory response by acting on keratinocytes, dendritic cells and inly on T-cells to drive tissue infiltration, cell maturation and cell proliferation. In cultured keratinocytes induces the expression of macrophage, T-cell, and neutrophil chemokines, such as CCL3, CCL4, CCL5, CCL2, CCL17, CCL22, CL20, CCL5, CCL2, CCL17, CCL22, CXCL8, CCL20 and CXCL1, and the production of proinflammatory cytokines such as TNF-alpha, IL-8 and IL-6. In cultured monocytes upregulates expression of IL-1A, IL-1B and IL-6. In myeloid dendritic cells involved in cell maturation by upregulating surface expression of CD83, CD86 and HLA-DR. In monocyte-derived dendritic cells facilitates dendritic cell maturation and drives T-cell proliferation. May play a role in proinflammatory effects in the lung.

1. Hartz, P. A. Personal Communication. Baltimore, Md. 1/20/2010. 2. Soucy, P., Luu-The, V. Assessment of the ability of type 2 cytochrome b5 to modulate 17,20-lyase activity of human P450c17. J. Steroid Biochem. Molec. Biol. 80: 71-75, 2002.