Rat Inhibin beta A chain/INHBA ELISA Kit (RTFI00089)

Product Name:	Rat Inhibin beta A chain/INHBA ELISA Kit
Product Code:	RTFI00089
Size:	96 Assays
Target:	Rat INHbA
Alias:	INHbA
Reactivity:	Rat
Detection Method:	Sandwich ELISA, Double Antibody
Sensitivity:	9.375pg/ml
Range:	15.625-1000pg/ml
Storage:	4°C for 6 months
Note:	For Research Use Only

Recovery:

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

Matrix	Recovery range(%)	Average(%)
serum(n=5)	89-105	99
EDTA plasma(n=5)	85-105	96
UFH plasma(n=5)	91-99	95

Linearity:

The linearity of the kit was assayed by testing samples spiked with appropriate concentration of Rat INHbA 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)	89-105%	85-98%	86-102%
EDTA plasma(n=5)	84-100%	82-99%	92-97%
UFH plasma(n=5)	89-98%	80-100%	88-98%

Intra-Assay:

CV <8%

Inter-Assay:

CV <10%

Uniprot:

P18331

UniProt Protein Function:	INHBA: Inhibins and activins inhibit and activate, respectively, the secretion of follitropin by the pituitary gland. Inhibins/activins are involved in regulating a number of diverse functions such as hypothalamic and pituitary hormone secretion, gonadal hormone secretion, germ cell development and maturation, erythroid differentiation, insulin secretion, nerve cell survival, embryonic axial development or bone growth, depending on their subunit composition. Inhibins appear to oppose the functions of activins. Belongs to the TGF-beta family.
UniProt Protein Details:	Protein type:Secreted, signal peptide; Secreted Cellular Component: extracellular space; extracellular region Molecular Function:identical protein binding; growth factor activity; protein heterodimerization activity; peptide hormone binding; hormone activity; cytokine activity; transforming growth factor beta receptor binding; receptor binding Biological Process: positive regulation of transcription, DNA-dependent; positive regulation of cellular protein metabolic process; activin receptor signaling pathway; mesodermal cell differentiation; palate development; negative regulation of cell cycle; regulation of apoptosis; odontogenesis; negative regulation of cell proliferation; hair follicle development; ovarian follicle development; cell cycle arrest; hemoglobin biosynthetic process; response to drug; regulation of follicle-stimulating hormone secretion; positive regulation of erythrocyte differentiation; male gonad development; progesterone secretion; regulation of transcription from RNA polymerase II promoter; mesoderm formation; regulation of MAPKKK cascade; hemopoietic progenitor cell differentiation; positive regulation of transcription from RNA polymerase II promoter; negative regulation of cell growth; cell development; growth; G1/S transition of mitotic cell cycle
NCBI Summary:	subunit which can homodimerize or heterodimerize with Inhbb to regulate FSH secretion [RGD, Feb 2006]
UniProt Code:	P18331
NCBI GenInfo Identifier:	124281
NCBI Gene ID:	29200
NCBI Accession:	P18331.1
UniProt Related Accession:	P18331
Molecular Weight:	47,406 Da
NCBI Full Name:	Inhibin beta A chain
NCBI Synonym Full Names:	inhibin beta-A
NCBI Official Symbol:	Inhba
NCBI Protein Information:	inhibin beta A chain; activin A; activin beta-A chain
UniProt Protein Name:	Inhibin beta A chain
UniProt Synonym Protein Names:	Activin beta-A chain
Protein Family:	Inhibin
UniProt Gene Name:	Inhba
UniProt Entry Name:	INHBA_RAT

Step	Procedure
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 clotovernight at 2-8°C. Centrifuge for 10 minutes at 1,000x g. Removeserum 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 anti-coagulant. 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 & homogenizein 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.