人干細(xì)胞因子受體（SCFR）ELISA Kit

時(shí)間：2012/5/2 瀏覽次數(shù)：1516

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R&D Systems提供種類齊全的完整ELISA試劑盒。為確保高優(yōu)品質(zhì)及重復(fù)性，所有試劑盒均經(jīng)過極其嚴(yán)格的質(zhì)量檢驗(yàn)。為檢測胞內(nèi)和胞外蛋白，試劑盒使用了多種檢測手段，包括比色法、熒光法和化學(xué)發(fā)光法等。

規(guī)格：48次/96次價(jià)格：1600/2600

Reagent		Quantity Per Plate		Container		Reconstitution		Dilution
96-Well Microplate or Strips Coated w/ Capture Antibody		12 x 8 Strips		-		-		-
Biotin-Conjugated Detection Antibody		Lyophilized		Yellow		67 µl H2O		Use Detection Antibody Diluent
Ready-to-Use Avidin-HRP Conjugate Solution		11 ml		Clear		-		-
Cytokine Protein Standard		Lyophilized （15 ng）		Red		100 µl H2O		Use Protein Standard Diluent
Ready-to-Use Substrate		11 ml		Brown		-		-
Stop Solution		11 ml		Clear		-		-
Adhesive Plate Sealers		4 Sheets		-		-		-
Wash Buffer （10X）		50 ml		Clear		-		Dilute to 1X Using Pure H2O
Protein Standard Diluent		11 ml		Clear		-		-
Detection Antibody Diluent		11 ml		Clear		-		-
Condition			Component		Storage Information		Storage Time
Sealed, Unopened Assay Kit			-		2-8°C		1 month
Reconstituted, Opened Assay Kit			96-Well Microplate （Capture Antibody Coated）		2-8°C		1 month
			Detection Antibody
			Ready-to-Use Avidin-HRP Conjugate Solution
			Cytokine Protein Standard
			Ready-to-Use Substrate
			Stop Solution
			Wash Buffer （10X）
			Protein Standard Diluent
			Detection Antibody Diluent
			Plate Sealers
Human SCFR Standard Curve
Concentration （pg/ml）	Average OD 450nm
2000	2.25
1000	1.7
500	1
250	0.57
125	0.34
62.5	0.18
31.25	0.093

INTRODUCTION

SCF-R/c-kit, also known as KIT, is a tyrosine-protein kinase that acts as cell-surface receptor for the cytokine KITLG/SCF and plays an essential role in the regulation of cell survival and proliferation, hematopoiesis, stem cell maintenance, gametogenesis, mast cell development, migration and function, and in melanogenesis. In response to KITLG/SCF binding, KIT can activate several signaling pathways. KIT phosphorylates PIK3R1, PLCG1, SH2B2/APS and CBL. KIT also activates the AKT1 signaling pathway by phosphorylation of PIK3R1, the regulatory subunit of phosphatidylinositol 3-kinase. Activated KIT also transmits signals via GRB2 and activation of RAS, RAF1 and the MAP kinases MAPK1/ERK2 and/or MAPK3/ERK1. The protein promotes activation of STAT family members STAT1, STAT3, STAT and STAT5B. Activation of PLCG1 leads to the production of the cellular signaling molecules diacylglycerol and inositol-1,4,5-trisphosphate. KIT signaling is modulated by protein phosphatases, and by rapid internalization and degradation of the receptor. Activated KIT promotes phosphorylation of the protein phosphatases PTPN6/SHP-1 and PTPRU, and of the transcription factors STAT1, STAT3, STAT and STAT5B. KIT promotes phosphorylation of PIK3R1, CBL, CRK （isoform Crk-II）, LYN, MAPK1/ERK2 and/or MAPK3/ERK1, PLCG1, SRC and SHC1. C-kit is present in an inactive conformation in the absence of bound ligand. KITLG/SCF binding leads to dimerization and activation by auto-phosphorylation on tyrosine residues. Activity is down-regulated by PRKCA-mediated phosphorylation on serine residues. SCF R/c-kit is inhibited by imatinib/STI-571 and sunitinib; these compounds maintain the kinase in an inactive conformation. In the absence of bound KITLG/SCF, KIT is a monomer and is a homodimer in the presence of bound KITLG/SCF, forming a heterotetramer with two KITLG/SCF molecules. KIT interacts （via phosphorylated tyrosine residues） with the adapter proteins GRB2 and GRB7 （via SH2 domain）, and SH2B2/APS. Interacts （via C-terminus） with MPDZ （via the tenth PDZ domain）. KIT also interacts （via phosphorylated tyrosine residues） with PIK3R1 and PIK3CD. Interacts （via phosphorylated tyrosine） with CRK （isoform Crk-II）, FYN, SHC1 and MATK/CHK （via SH2 domain）. Additionally, KIT interacts with LYN and FES/FPS. SCF R/c-kit also interacts （via phosphorylated tyrosine residues） with the protein phosphatases PTPN6/SHP-1 （via SH2 domain）, PTPN11/SHP-2 （via SH2 domain） and PTPRU. Furthermore, KIT interacts with PLCG1. Isoform 1 and isoform 2 are detected in spermatogonia and Leydig cells. Isoform 3 is detected in round spermatids, elongating spermatids and spermatozoa （at protein level）. KIT is widely expressed and detected in the hematopoietic system, the gastrointestinal system, in melanocytes and in germ cells. KIT is up-regulated by cis-retinoic acid in neuroblastoma cell lines and ubiquitinated by SOCS6. KIT is rapidly ubiquitinated after auto-phosphorylation induced by KITLG/SCF binding, leading to internalization and degradation. KITLG/SCF binding enhances auto-phosphorylation. Isoform 1 shows low levels of tyrosine phosphorylation in the absence of added KITLG/SCF （in vitro）. Kinase activity is down-regulated by phosphorylation on serine residues by protein kinase C family members. Phosphorylation at Tyr-568 is required for interaction with PTPN11/SHP-2, CRK （isoform Crk-II） and members of the SRC tyrosine-protein kinase family. Phosphorylation at Tyr-570 is required for interaction with PTPN6/SHP-1. Phosphorylation at Tyr-703, Tyr-823 and Tyr-936 is also important for interaction with GRB2. Phosphorylation at Tyr-721 is similarly important for interaction with PIK3R1. Phosphorylation at Tyr-823 and Tyr-936 is vital for interaction with GRB7. Defects in KIT can lead to a variety of diseases, which include, but are not limited, to the following: Piebald trait （PBT）, gastrointestinal stromal tumor （GIST）, testicular tumors, acute myelogenous leukemia. Numerous proteins are phosphorylated in response to KIT signaling, but it is not evident to determine which are directly phosphorylated by KIT under in vivo conditions.

Source: Entrez Gene; Swiss-Prot

ASSAY PRINCIPLES

The OmniKine™ Human SCFR ELISA Kit contains the components necessary for quantitative determination of natural or recombinant hSCFR concentrations within any experimental sample including cell lysates, serum and plasma. This particular immunoassay utilizes the quantitative technique of a “Sandwich” Enzyme-Linked Immunosorbent Assay （ELISA） where the target protein （antigen） is bound in a “sandwich” format by the primary capture antibodies coated to each well-bottom and the secondary detection antibodies added subsequently by the investigator. The capture antibodies coated to the bottom of each well are specific for a particular epitope on the Human SCFR cytokine while the user-added detection antibodies bind to epitopes on the captured target protein. Amid each step of the procedure, a

series of wash steps must be performed to ensure the elimination of non-specific binding between proteins to other proteins or to the solid phase. After incubation and “sandwiching” of the target antigen, a peroxidase enzyme is conjugated to the constant heavy chain of the secondary antibody （either covalently or via Avidin/Streptavidin-Biotin interactions）, allowing for a colorimetric reaction to ensue upon substrate addition. When the substrate TMB （3, 3’, 5, 5’-Tetramethylbenzidine） is added, the reaction catalyzed by peroxidase yields a blue color that is representative of the antigen concentration. Upon sufficient color development, the reaction can be terminated through addition of Stop Solution （2 N Sulfuric Acid） where the color of the solution will turn yellow. The absorbance of each well can then be read by a spectrophotometer, allowing for generation of a standard curve and subsequent determination of protein concentration.

ASSAY RESTRICTIONS

?This ELISA kit is intended for research purposes only, NOT diagnostic or clinical procedures of any kind.

?Materials included in this kit should NOT be used past the expiration date on the kit label.

?Reagents or substrates included in this kit should NOT be mixed or substituted with reagents or substrates from any other kits.

?Variations in pipetting technique, washing technique, operator laboratory technique, kit age, incubation time or temperature may cause differences in binding affinity of the materials provided.

?The assay is designed to eliminate interference and background by other cellular macromolecules or factors present within any biological samples. However, the possibility of background noise cannot be fully excluded until all factors have been tested using the assay kit.

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