| ET-2

Endothelin 2 (ET-2) belongs to a family of three endothelin peptide isoforms (ET-1, ET-2, ET-3), which constrict blood vessels. ET-2 is encoded by genes on separate chromosomes to its isoforms and is mainly produced in vascular endothelial cells of the kidney, placenta, uterus, heart, central nervous system and intestine.It becomes present in the blood of animals and humans at levels ranging from 0.3pg/ml to 3pg/ml.ET-2 acts by binding to two different G-protein coupled receptors (GPCRs), the endothelin A receptor (EDNRA) and the endothelin B receptor (EDNRB).
 

| Typical data

As the OD values of the standard curve may vary according to the conditions of the actual assay performance (e.g. operator, pipetting technique, wash technique or temperature effects), the operator should establish a standard curve for each test. Typical standard curve and data are provided below for reference only.

 

Concentration (pg/mL)	1000	500	250	125	62.5	31.2	15.6	0
OD	0.14	0.23	0.41	0.67	0.85	1.14	1.45	1.79

 

| Repeatability

Intra-assay Precision (Precision within an assay)：CV% < 10%; Inter-assay Precision (Precision between assays)：CV% < 10%
 

| Recovery

The recovery of Human ET-2 spiked at three different levels in samples throughout the range of the assay was evaluated in various matrices.

 

Sample Type	Range(%)	Average Recovery(%)
Serum(n=8)	84-101	95
Plasma(n=8)	92-105	102

 

| Linearity

Samples were spiked with high concentrations of Human ET-2 and diluted with Universal Diluent to produce samples with values within the range of the assay.

 

		Serum(n=4)	Plasma(n=4)
1 : 2	Range (%)	84-96	88-96
	Average (%)	91	93
1 : 4	Range (%)	89-103	87-108
	Average (%)	94	98