Human FLT3 ELISA Kit (HUEB0055)- High Sensitivity

Product Name:	Human Receptor-type tyrosine-protein kinase FLT3 (FLT3) ELISA Kit
SKU:	HUEB0055
Size:	96T
Target:	Human Receptor-type tyrosine-protein kinase FLT3 (FLT3)
Synonyms:	FL cytokine receptor, Fetal liver kinase-2, Fms-like tyrosine kinase 3, Stem cell tyrosine kinase 1, FLK-2, FLT-3, STK-1, CD135, CD135, FLK2, STK1
Assay Type:	Sandwich
Detection Method:	ELISA
Reactivity:	Human
Detection Range:	78-5000pg/mL
Sensitivity:	21pg/mL

Intra CV:

3.9%

Inter CV:

6.2%

Linearity:

Sample	1:2	1:4	1:8	1:16
Serum(N=5)	103-115%	80-90%	88-97%	99-109%
EDTA Plasma(N=5)	83-95%	108-117%	103-114%	109-119%
Heparin Plasma(N=5)	95-104%	115-127%	109-119%	102-112%

Recovery:

Sample Type	Average(%)	Recovery Range(%)
Serum	92	86-98
Plasma	94	88-100

Function:

Tyrosine-protein kinase that acts as cell-surface receptor for the cytokine FLT3LG and regulates differentiation, proliferation and survival of hematopoietic progenitor cells and of dendritic cells. Promotes phosphorylation of SHC1 and AKT1, and activation of the downstream effector MTOR. Promotes activation of RAS signaling and phosphorylation of downstream kinases, including MAPK1/ERK2 and/or MAPK3/ERK1. Promotes phosphorylation of FES, FER, PTPN6/SHP, PTPN11/SHP-2, PLCG1, and STAT5A and/or STAT5B. Activation of wild-type FLT3 causes only marginal activation of STAT5A or STAT5B. Mutations that cause constitutive kinase activity promote cell proliferation and resistance to apoptosis via the activation of multiple signaling pathways.

Uniprot:	P36888
Sample Type:	Serum, plasma, tissue homogenates, cell culture supernates and other biological fluids
Specificity:	Natural and recombinant human Receptor-type tyrosine-protein kinase FLT3
Sub Unit:	Monomer in the absence of bound FLT3LG. Homodimer in the presence of bound FLT3LG. Interacts with FIZ1 following ligand activation (By similarity). Interacts with FES, FER, LYN, FGR, HCK, SRC and GRB2. Interacts with PTPRJ/DEP-1 and PTPN11/SHP2. Interacts with RNF115 and RNF126.
Research Area:	Signal Transduction
Subcellular Location:	Membrane Single-pass type I membrane protein Endoplasmic reticulum lumen Constitutively activated mutant forms with internal tandem duplications are less efficiently transported to the cell surface and a significant proportion is retained in an immature form in the endoplasmic reticulum lumen. The activated kinase is rapidly targeted for degradation.
Storage:	Please see kit components below for exact storage details
Note:	For research use only

UniProt Protein Function:	FLT3: a receptor tyrosine kinase of the PDGFR family that binds the FL cytokine. FLT3 -/- mice have an impaired developmental capacity of primitive hematopoietic progenitor cells of all lineages with the greatest impact on lymphopoietic precursors. Activating mutations found in one third of cases of acute myeloid leukemia (AML), as well as in acute lymphoblastic leukemia, acute promyelocytic leukemia and myelodysplastic syndrome. Inhibitors: Sutent and PKC412.
UniProt Protein Details:	Protein type:EC 2.7.10.1; Kinase, protein; Membrane protein, integral; Oncoprotein; PDGFR family; Protein kinase, TK; Protein kinase, tyrosine (receptor); TK group Chromosomal Location of Human Ortholog: 13q12.2 Cellular Component: endoplasmic reticulum; integral to plasma membrane; plasma membrane Molecular Function:hematopoietin/interferon-class (D200-domain) cytokine receptor activity; protein binding; protein homodimerization activity; protein self-association; transmembrane receptor protein tyrosine kinase activity; vascular endothelial growth factor receptor activity Biological Process: B cell differentiation; cytokine and chemokine mediated signaling pathway; hemopoiesis; leukocyte homeostasis; lymphocyte proliferation; myeloid progenitor cell differentiation; peptidyl-tyrosine phosphorylation; positive regulation of cell proliferation; positive regulation of MAP kinase activity; positive regulation of MAPKKK cascade; positive regulation of phosphoinositide 3-kinase activity; positive regulation of phosphoinositide 3-kinase cascade; positive regulation of tyrosine phosphorylation of STAT protein; pro-B cell differentiation; protein amino acid autophosphorylation; regulation of apoptosis; transmembrane receptor protein tyrosine kinase signaling pathway Disease: Leukemia, Acute Lymphoblastic
NCBI Summary:	This gene encodes a class III receptor tyrosine kinase that regulates hematopoiesis. This receptor is activated by binding of the fms-related tyrosine kinase 3 ligand to the extracellular domain, which induces homodimer formation in the plasma membrane leading to autophosphorylation of the receptor. The activated receptor kinase subsequently phosphorylates and activates multiple cytoplasmic effector molecules in pathways involved in apoptosis, proliferation, and differentiation of hematopoietic cells in bone marrow. Mutations that result in the constitutive activation of this receptor result in acute myeloid leukemia and acute lymphoblastic leukemia. [provided by RefSeq, Jan 2015]
UniProt Code:	P36888
NCBI GenInfo Identifier:	156630887
NCBI Gene ID:	2322
NCBI Accession:	P36888.2
UniProt Secondary Accession:	P36888,Q13414, A0AVG9, B7ZLT7, B7ZLT8, F5H0A0,
UniProt Related Accession:	P36888
Molecular Weight:	113kDa
NCBI Full Name:	Receptor-type tyrosine-protein kinase FLT3
NCBI Synonym Full Names:	fms related tyrosine kinase 3
NCBI Official Symbol:	FLT3
NCBI Official Synonym Symbols:	FLK2; STK1; CD135; FLK-2
NCBI Protein Information:	receptor-type tyrosine-protein kinase FLT3
UniProt Protein Name:	Receptor-type tyrosine-protein kinase FLT3
UniProt Synonym Protein Names:	FL cytokine receptor; Fetal liver kinase-2; FLK-2; Fms-like tyrosine kinase 3; FLT-3; Stem cell tyrosine kinase 1; STK-1; CD_antigen: CD135
Protein Family:	Flt3 receptor-interacting lectin
UniProt Gene Name:	FLT3

Component	Quantity (96 Assays)	Storage
ELISA Microplate (Dismountable)	8×12 strips	-20°C
Lyophilized Standard	2	-20°C
Sample Diluent	20ml	-20°C
Assay Diluent A	10mL	-20°C
Assay Diluent B	10mL	-20°C
Detection Reagent A	120µL	-20°C
Detection Reagent B	120µL	-20°C
Wash Buffer	30mL	4°C
Substrate	10mL	4°C
Stop Solution	10mL	4°C
Plate Sealer	5	-

Other materials and equipment required:

Microplate reader with 450 nm wavelength filter
Multichannel Pipette, Pipette, microcentrifuge tubes and disposable pipette tips
Incubator
Deionized or distilled water
Absorbent paper
Buffer resevoir

*Note: The below protocol is a sample protocol. Protocols are specific to each batch/lot. For the correct instructions please follow the protocol included in your kit.

Allow all reagents to reach room temperature (Please do not dissolve the reagents at 37°C directly). All the reagents should be mixed thoroughly by gently swirling before pipetting. Avoid foaming. Keep appropriate numbers of strips for 1 experiment and remove extra strips from microtiter plate. Removed strips should be resealed and stored at -20°C until the kits expiry date. Prepare all reagents, working standards and samples as directed in the previous sections. Please predict the concentration before assaying. If values for these are not within the range of the standard curve, users must determine the optimal sample dilutions for their experiments. We recommend running all samples in duplicate.

Step
1.	Add Sample: Add 100µL of Standard, Blank, or Sample per well. The blank well is added with Sample diluent. Solutions are added to the bottom of micro ELISA plate well, avoid inside wall touching and foaming as possible. Mix it gently. Cover the plate with sealer we provided. Incubate for 120 minutes at 37°C.
2.	Remove the liquid from each well, don't wash. Add 100µL of Detection Reagent A working solution to each well. Cover with the Plate sealer. Gently tap the plate to ensure thorough mixing. Incubate for 1 hour at 37°C. Note: if Detection Reagent A appears cloudy warm to room temperature until solution is uniform.
3.	Aspirate each well and wash, repeating the process three times. Wash by filling each well with Wash Buffer (approximately 400µL) (a squirt bottle, multi-channel pipette,manifold dispenser or automated washer are needed). Complete removal of liquid at each step is essential. After the last wash, completely remove remaining Wash Buffer by aspirating or decanting. Invert the plate and pat it against thick clean absorbent paper.
4.	Add 100µL of Detection Reagent B working solution to each well. Cover with the Plate sealer. Incubate for 60 minutes at 37°C.
5.	Repeat the wash process for five times as conducted in step 3.
6.	Add 90µL of Substrate Solution to each well. Cover with a new Plate sealer and incubate for 10-20 minutes at 37°C. Protect the plate from light. The reaction time can be shortened or extended according to the actual color change, but this should not exceed more than 30 minutes. When apparent gradient appears in standard wells, user should terminatethe reaction.
7.	Add 50µL of Stop Solution to each well. If color change does not appear uniform, gently tap the plate to ensure thorough mixing.
8.	Determine the optical density (OD value) of each well at once, using a micro-plate reader set to 450 nm. User should open the micro-plate reader in advance, preheat the instrument, and set the testing parameters.
9.	After experiment, store all reagents according to the specified storage temperature respectively until their expiry.

When carrying out an ELISA assay it is important to prepare your samples in order to achieve the best possible results. Below we have a list of procedures for the preparation of samples for different sample types.

Sample Type	Protocol
Serum	If using serum separator tubes, allow samples to clot for 30 minutes at room temperature. Centrifuge for 10 minutes at 1,000x g. Collect the serum fraction and assay promptly or aliquot and store the samples at -80°C. Avoid multiple freeze-thaw cycles. If serum separator tubes are not being used, allow samples to clot overnight at 2-8°C. Centrifuge for 10 minutes at 1,000x g. Remove serum and assay promptly or aliquot and store the samples at -80°C. Avoid multiple freeze-thaw cycles.
Plasma	Collect plasma using EDTA or heparin as an anticoagulant. Centrifuge samples at 4°C for 15 mins at 1000 × g within 30 mins of collection. Collect the plasma fraction and assay promptly or aliquot and store the samples at -80°C. Avoid multiple freeze-thaw cycles. Note: Over haemolysed samples are not suitable for use with this kit.
Urine & Cerebrospinal Fluid	Collect the urine (mid-stream) in a sterile container, centrifuge for 20 mins at 2000-3000 rpm. Remove supernatant and assay immediately. If any precipitation is detected, repeat the centrifugation step. A similar protocol can be used for cerebrospinal fluid.
Cell culture supernatant	Collect the cell culture media by pipette, followed by centrifugation at 4°C for 20 mins at 1500 rpm. Collect the clear supernatant and assay immediately.
Cell lysates	Solubilize cells in lysis buffer and allow to sit on ice for 30 minutes. Centrifuge tubes at 14,000 x g for 5 minutes to remove insoluble material. Aliquot the supernatant into a new tube and discard the remaining whole cell extract. Quantify total protein concentration using a total protein assay. Assay immediately or aliquot and store at ≤ -20 °C.
Tissue homogenates	The preparation of tissue homogenates will vary depending upon tissue type. Rinse tissue with 1X PBS to remove excess blood & homogenize in 20ml of 1X PBS (including protease inhibitors) and store overnight at ≤ -20°C. Two freeze-thaw cycles are required to break the cell membranes. To further disrupt the cell membranes you can sonicate the samples. Centrifuge homogenates for 5 mins at 5000xg. Remove the supernatant and assay immediately or aliquot and store at -20°C or -80°C.
Tissue lysates	Rinse tissue with PBS, cut into 1-2 mm pieces, and homogenize with a tissue homogenizer in PBS. Add an equal volume of RIPA buffer containing protease inhibitors and lyse tissues at room temperature for 30 minutes with gentle agitation. Centrifuge to remove debris. Quantify total protein concentration using a total protein assay. Assay immediately or aliquot and store at ≤ -20 °C.
Breast Milk	Collect milk samples and centrifuge at 10,000 x g for 60 min at 4°C. Aliquot the supernatant and assay. For long term use, store samples at -80°C. Minimize freeze/thaw cycles.

ELISA	Antibodies
Human CD135 / Flt3 ELISA Kit	Anti-FLT3 Antibody (CAB12437)
Human Flt3 (FMS Like Tyrosine Kinase 3) ELISA Kit (HUES02006)	Anti-FLT3 Antibody (CAB12462)
FLT3 Colorimetric Cell-Based ELISA Kit	Anti-FLT3 Antibody (CAB7897)
FLT3 (Phospho-Tyr599) Colorimetric Cell-Based ELISA Kit	Anti-Phospho-FLT3-Y589/591 Antibody (CABP0529)
	FLT3 Antibody (PACO02257)