Product Name:	Human ETRB / Endothelin B Receptor ELISA Kit
Product Code:	HUFI02433
Size:	96 Assays
Alias:	ETRB, ET-B, ABCDS, endothelin B receptor, Endothelin receptor non-selective type, endothelin receptor type B, ETB, ET-B, ETBR, ET-BR, HSCR, HSCR2, WS4A
Detection method:	Sandwich ELISA, Double Antibody
Application:	This immunoassay kit allows for the in vitro quantitative determination of Human ETRB concentrations in serum plasma and other biological fluids.
Sensitivity:	0.188ng/ml
Range:	0.313-20ng/ml
Storage:	4°C for 6 months
Note:	For Research Use Only

Recovery:

Matrices listed below were spiked with certain level of Human ETRB and the recovery rates were calculated by comparing the measured value to the expected amount of Human ETRB in samples.

Matrix	Recovery range(%)	Average(%)
serum(n=5)	87-105	95
EDTA plasma(n=5)	86-102	92
UFH plasma(n=5)	90-99	95

Linearity:

The linearity of the kit was assayed by testing samples spiked with appropriate concentration of Human ETRB and their serial dilutions. The results were demonstrated by the percentage of calculated concentration to the expected.

Sample	1:2	1:4	1:8
serum(n=5)	87-102%	85-91%	91-101%
EDTA plasma(n=5)	82-95%	91-100%	95-101%
UFH plasma(n=5)	85-100%	83-99%	84-99%

CV(%):

Intra-Assay: CV<8%
Inter-Assay: CV<10%

Component	Quantity	Storage
ELISA Microplate (Dismountable)	8×12 strips	4°C for 6 months
Lyophilized Standard	2	4°C/-20°C
Sample/Standard Dilution Buffer	20ml	4°C
Biotin-labeled Antibody(Concentrated)	120ul	4°C (Protect from light)
Antibody Dilution Buffer	10ml	4°C
HRP-Streptavidin Conjugate(SABC)	120ul	4°C (Protect from light)
SABC Dilution Buffer	10ml	4°C
TMB Substrate	10ml	4°C (Protect from light)
Stop Solution	10ml	4°C
Wash Buffer(25X)	30ml	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

Uniprot

P24530

UniProt Protein Function:	ETB: a G protein-coupled receptor which activates a phosphatidylinoitol-calcium second messenger system. Its ligand, endothelin, consists of a family of three potent vasoactive peptides: ET1, ET2, and ET3. Studies suggest that the multigenic disorder, Hirschsprung disease type 2, is due to mutation in endothelin receptor type B gene. Essential component in the normal development of two neuronal crest-derived cell lineages. Two splice variant isoforms have been described.
UniProt Protein Details:	Protein type:Membrane protein, integral; GPCR, family 1; Membrane protein, multi-pass; Receptor, GPCR Chromosomal Location of Human Ortholog: 13q22 Cellular Component: nuclear membrane; integral to plasma membrane; plasma membrane; lipid raft Molecular Function:endothelin receptor activity; protein binding; peptide hormone binding; type 1 angiotensin receptor binding Biological Process: epithelial fluid transport; cGMP-mediated signaling; regulation of fever; negative regulation of cellular protein metabolic process; response to pain; negative regulation of transcription from RNA polymerase II promoter; vein smooth muscle contraction; sensory perception of pain; response to organic cyclic substance; enteric nervous system development; vasodilation; regulation of epithelial cell proliferation; elevation of cytosolic calcium ion concentration; cell surface receptor linked signal transduction; regulation of blood pressure; melanocyte differentiation; positive regulation of cell proliferation; regulation of pH; neural crest cell migration; aging; posterior midgut development; nervous system development; vasoconstriction; negative regulation of adenylate cyclase activity; macrophage chemotaxis; peripheral nervous system development; negative regulation of neuron maturation; G-protein signaling, coupled to IP3 second messenger (phospholipase C activating); positive regulation of protein amino acid phosphorylation; regulation of sensory perception of pain; negative regulation of apoptosis Disease: Waardenburg Syndrome, Type 4a; Abcd Syndrome; Hirschsprung Disease, Susceptibility To, 2
NCBI Summary:	The protein encoded by this gene is a G protein-coupled receptor which activates a phosphatidylinositol-calcium second messenger system. Its ligand, endothelin, consists of a family of three potent vasoactive peptides: ET1, ET2, and ET3. Studies suggest that the multigenic disorder, Hirschsprung disease type 2, is due to mutations in the endothelin receptor type B gene. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jan 2011]
UniProt Code:	P24530
NCBI GenInfo Identifier:	119622
NCBI Gene ID:	1910
NCBI Accession:	P24530.1
UniProt Secondary Accession:	P24530,O15343, Q59GB1, Q5W0G9, Q8NHM6, Q8NHM7, Q8NHM8 Q8NHM9, Q9UD23, Q9UQK3, A2A2Z8, A8K3T4,
UniProt Related Accession:	P24530,AAB24922
Molecular Weight:	436
NCBI Full Name:	Endothelin B receptor
NCBI Synonym Full Names:	endothelin receptor type B
NCBI Official Symbol:	EDNRB
NCBI Official Synonym Symbols:	ETB; ET-B; ETBR; ETRB; HSCR; WS4A; ABCDS; ET-BR; HSCR2
NCBI Protein Information:	endothelin B receptor; endothelin receptor non-selective type
UniProt Protein Name:	Endothelin B receptor
UniProt Synonym Protein Names:	Endothelin receptor non-selective type
Protein Family:	Endothelin B receptor
UniProt Gene Name:	EDNRB
UniProt Entry Name:	EDNRB_HUMAN

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

Before adding to wells, equilibrate the SABC working solution and TMB substrate for at least 30 min at 37°C. When diluting samples and reagents, they must be mixed completely and evenly. It is recommended to plot a standard curve for each test.

Step	Protocol
1.	Set standard, test sample and control (zero) wells on the pre-coated plate respectively, and then, record their positions. It is recommended to measure each standard and sample in duplicate. Wash plate 2 times before adding standard, sample and control (zero) wells!
2.	Aliquot 0.1ml standard solutions into the standard wells.
3.	Add 0.1 ml of Sample / Standard dilution buffer into the control (zero) well.
4.	Add 0.1 ml of properly diluted sample ( Human serum, plasma, tissue homogenates and other biological fluids.) into test sample wells.
5.	Seal the plate with a cover and incubate at 37 °C for 90 min.
6.	Remove the cover and discard the plate content, clap the plate on the absorbent filter papers or other absorbent material. Do NOT let the wells completely dry at any time. Wash plate X2.
7.	Add 0.1 ml of Biotin- detection antibody working solution into the above wells (standard, test sample & zero wells). Add the solution at the bottom of each well without touching the side wall.
8.	Seal the plate with a cover and incubate at 37°C for 60 min.
9.	Remove the cover, and wash plate 3 times with Wash buffer. Let wash buffer rest in wells for 1 min between each wash.
10.	Add 0.1 ml of SABC working solution into each well, cover the plate and incubate at 37°C for 30 min.
11.	Remove the cover and wash plate 5 times with Wash buffer, and each time let the wash buffer stay in the wells for 1-2 min.
12.	Add 90 Ã‚µl of TMB substrate into each well, cover the plate and incubate at 37°C in dark within 10-20 min. (Note: This incubation time is for reference use only, the optimal time should be determined by end user.) And the shades of blue can be seen in the first 3-4 wells (with most concentrated standard solutions), the other wells show no obvious color.
13.	Add 50 Ã‚µl of Stop solution into each well and mix thoroughly. The color changes into yellow immediately.
14.	Read the O.D. absorbance at 450 nm in a microplate reader immediately after adding the stop solution.

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.