DESCRIPTION

The serotonin transporter (SERT) is a crucial protein encoded by the SLC6A4 gene, responsible for regulating serotonin levels in the brain and gut. It plays a significant role in mood regulation, anxiety, and gastrointestinal functions. SERT is also a key target for antidepressants and other psychoactive drugs. Genetic variations of SERT are associated with mental disorders.

PRINCIPLE OF THE ASSAY

Sandwich ELISA structure (Detection antibody labeled with HRP) A capture antibody is pre-coated onto the bottom of wells which binds to analyte of interest. A detection antibody labeled with HRP also binds to the analyte. TMB acts as the HRP substrate and the solution color will change from colorless to blue. A stop solution containing sulfuric acid turns solution yellow. The color intensity is proportional to the quantity of bound protein which is measurable at 450 nm with the correction wavelength set at 630 nm.

PRECISION

Intra-assay Precision (Precision within an assay) Three samples of known concentration were tested 8 times on one plate to assess intra-assay precision. Inter-assay Precision (Precision between assays) Three samples of known concentration were tested in 16 separate assays to assess inter-assay precision.

Intra-assay Precision

Sample	n	Mean (pg/mL)	SD	CV%
1	8	128.9	3.7	2.8
2	8	34.8	0.7	1.9
3	8	18.6	0.4	1.9

Inter-assay Precision

Sample	n	Mean (pg/mL)	SD	CV%
1	16	127.4	3.7	2.9
2	16	34.5	0.9	2.5
3	16	18.5	0.4	2.2

RECOVERY

The recovery of human Serotonin transporter spiked to three different levels throughout the range of the assay in cell lysate was evaluated.

Sample Type		Average% of Expected	Range (%)
Cell lysate	1:16	87	84-90
	1:32	93	90-98

LINEARITY

To assess the linearity of the assay, samples were diluted with the appropriate Sample Diluent to produce samples with values within the dynamic range of the assay. (The cell lysate was initially diluted 1:4.)

		Cell lysate
1:2	Average% of Expected	100
	Range (%)	-
1:4	Average% of Expected	84
	Range (%)	75-94
1:8	Average% of Expected	81
	Range (%)	71-90
1:16	Average% of Expected	119
	Range (%)	106-132

CALIBRATION

This immunoassay is calibrated against a highly purified recombinant human Human Serotonin transporter Sandwich ELISA Kit produced at Sunlong Medical™.