Human CPP/Copeptin ELISA Kit (HUFI02359)

Product Name:	Human CPP/Copeptin ELISA Kit
Product Code:	HUFI02359
Size:	96 Assays
Alias:	CPP, CT-proAVP, C-Terminal Provasopressin, Vasopressin-Neurophysin 2-Copeptin
Detection method:	Sandwich ELISA, Double Antibody
Application:	This immunoassay kit allows for the in vitro quantitative determination of Human CPP concentrations in serum plasma and other biological fluids.
Sensitivity:	18.75pg/ml
Range:	31.25-2000pg/ml(1.56-100pmol/L)
Storage:	4°C for 6 months
Note:	For Research Use Only

Recovery:

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

Matrix	Recovery range(%)	Average(%)
serum(n=5)	86-102	92
EDTA plasma(n=5)	89-105	96
UFH plasma(n=5)	85-95	90

Linearity:

The linearity of the kit was assayed by testing samples spiked with appropriate concentration of Human CPP 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)	88-103%	85-105%	92-100%
EDTA plasma(n=5)	85-101%	82-92%	87-99%
UFH plasma(n=5)	84-98%	83-96%	81-98%

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

P01185

UniProt Protein Function:	AVP: Neurophysin 2 specifically binds vasopressin. Defects in AVP are the cause of diabetes insipidus, neurohypophyseal (NDI). A disease characterized by persistent thirst, polydipsia and polyuria. Affected individuals are apparently normal at birth, but characteristically develop symptoms of vasopression deficiency during childhood. Belongs to the vasopressin/oxytocin family.
UniProt Protein Details:	Protein type:Secreted; Secreted, signal peptide; Hormone Chromosomal Location of Human Ortholog: 20p13 Cellular Component: cytosol; dendrite; extracellular region; extracellular space; secretory granule Molecular Function:caspase inhibitor activity; neurohypophyseal hormone activity; neuropeptide hormone activity; protein kinase activity; receptor binding; signal transducer activity; V1A vasopressin receptor binding; V1B vasopressin receptor binding Biological Process: cell-cell signaling; circadian rhythm; elevation of cytosolic calcium ion concentration; generation of precursor metabolites and energy; grooming behavior; hyperosmotic salinity response; locomotory behavior; maternal behavior; negative regulation of apoptosis; negative regulation of caspase activity; negative regulation of female receptivity; negative regulation of transmission of nerve impulse; penile erection; positive regulation of cAMP biosynthetic process; positive regulation of cell growth; positive regulation of cell proliferation; positive regulation of cellular pH reduction; positive regulation of glutamate secretion; positive regulation of peptidyl-serine phosphorylation; positive regulation of prostaglandin biosynthetic process; positive regulation of systemic arterial blood pressure; positive regulation of vasoconstriction; renal water homeostasis; response to ethanol; response to nicotine; response to testosterone stimulus; signal transduction; social behavior; sodium-independent organic anion transport; transmembrane transport; vasoconstriction; water transport Disease: Diabetes Insipidus, Neurohypophyseal
NCBI Summary:	This gene encodes a member of the vasopressin/oxytocin family and preproprotein that is proteolytically processed to generate multiple protein products. These products include the neuropeptide hormone arginine vasopressin, and two other peptides, neurophysin 2 and copeptin. Arginine vasopressin is a posterior pituitary hormone that is synthesized in the supraoptic nucleus and paraventricular nucleus of the hypothalamus. Along with its carrier protein, neurophysin 2, it is packaged into neurosecretory vesicles and transported axonally to the nerve endings in the neurohypophysis where it is either stored or secreted into the bloodstream. The precursor is thought to be activated while it is being transported along the axon to the posterior pituitary. Arginine vasopressin acts as a growth factor by enhancing pH regulation through acid-base transport systems. It has a direct antidiuretic action on the kidney, and also causes vasoconstriction of the peripheral vessels. This hormone can contract smooth muscle during parturition and lactation. It is also involved in cognition, tolerance, adaptation and complex sexual and maternal behaviour, as well as in the regulation of water excretion and cardiovascular functions. Mutations in this gene cause autosomal dominant neurohypophyseal diabetes insipidus (ADNDI). This gene is present in a gene cluster with the related gene oxytocin on chromosome 20. [provided by RefSeq, Nov 2015]
UniProt Code:	P01185
NCBI GenInfo Identifier:	13259533
NCBI Gene ID:	551
NCBI Accession:	NP_000481.2
UniProt Secondary Accession:	P01185,O14935, A0AV35,
UniProt Related Accession:	P01185
Molecular Weight:	17,325 Da
NCBI Full Name:	vasopressin-neurophysin 2-copeptin preproprotein
NCBI Synonym Full Names:	arginine vasopressin
NCBI Official Symbol:	AVP
NCBI Official Synonym Symbols:	VP; ADH; ARVP; AVRP; AVP-NPII
NCBI Protein Information:	vasopressin-neurophysin 2-copeptin
UniProt Protein Name:	Vasopressin-neurophysin 2-copeptin
UniProt Synonym Protein Names:	AVP-NPII
Protein Family:	Vasopressin-neurophysin 2-copeptin
UniProt Gene Name:	AVP
UniProt Entry Name:	NEU2_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 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 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.

Nikolov et al.

Levels of serum copeptin in preeclampsia and association with maternal echocardiographic and doppler ultrasound parameters

Journal of Experimental and Clinical Medicine 2023

PubMed ID: 36876570