Anti-HTRA1 Antibody Picoband® Fluoro488 Conjugated

Serine protease HTRA1 is an enzyme that in humans is encoded by the HTRA1 gene. This gene encodes a member of the trypsin family of serine proteases. This protein is a secreted enzyme that is proposed to regulate the availability of insulin-like growth factors (IGFs) by cleaving IGF-binding proteins. It has also been suggested to be a regulator of cell growth. Variations in the promoter region of this gene are the cause of susceptibility to age-related macular degeneration type 7.

A synthetic peptide corresponding to a sequence at the N-terminus of human HTRA1, which shares 93.2% amino acid (aa) sequence identity with both mouse and rat HTRA1.

Widely expressed, with strongest expression in placenta (at protein level) . Secreted by synovial fibroblasts. Up- regulated in osteoarthritis and rheumatoid arthritis synovial fluids and cartilage as compared with non-arthritic (at protein level) .

Serine protease with a variety of targets, including extracellular matrix proteins such as fibronectin. HTRA1-generated fibronectin fragments further induce synovial cells to up-regulate MMP1 and MMP3 production. May also degrade proteoglycans, such as aggrecan, decorin and fibromodulin. Through cleavage of proteoglycans, may release soluble FGF-glycosaminoglycan complexes that promote the range and intensity of FGF signals in the extracellular space. Regulates the availability of insulin-like growth factors (IGFs) by cleaving IGF-binding proteins. Inhibits signaling mediated by TGF-beta family members. This activity requires the integrity of the catalytic site, although it is unclear whether TGF-beta proteins are themselves degraded. By acting on TGF-beta signaling, may regulate many physiological processes, including retinal angiogenesis and neuronal survival and maturation during development. Intracellularly, degrades TSC2, leading to the activation of TSC2 downstream targets.

1. Akhatib, B., Onnerfjord, P., Gawri, R., Ouellet, J., Jarzem, P., Heinegard, D., Mort, J., Roughley, P., Haglund, L. Chondroadherin fragmentation mediated by the protease HTRA1distinguishes human intervertebral disc degeneration from normal aging. J. Biol. Chem. 288: 19280-19287, 2013. 2. Bianchi, S., Di Palma, C., Gallus, G. N., Taglia, I., Poggiani, A., Rosini, F., Rufa, A., Muresanu, D. F., Cerase, A., Dotti, M. T., Federico, A. Two novel HTRA1 mutations in a European CARASIL patient. Neurology 82: 898-900, 2014.