Human SFTPA1 ELISA Kit (HUEB0894)- High Sensitivity

Product Name:	Human Pulmonary surfactant-associated protein A1 (SFTPA1) ELISA Kit
SKU:	HUEB0894
Size:	96T
Target:	Human Pulmonary surfactant-associated protein A1 (SFTPA1)
Synonyms:	35 kDa pulmonary surfactant-associated protein, Alveolar proteinosis protein, Collectin-4, PSP-A, COLEC4, PSAP, SFTP1, SFTPA, SFTPA1B
Assay Type:	Sandwich
Detection Method:	ELISA
Reactivity:	Human
Detection Range:	1.56-100ng/mL
Sensitivity:	0.45ng/mL

Intra CV:

5.3%

Inter CV:

9.8%

Linearity:

Sample	1:2	1:4	1:8	1:16
Serum(N=5)	90-103%	92-102%	91-100%	105-115%
EDTA Plasma(N=5)	110-120%	91-99%	109-119%	102-112%
Heparin Plasma(N=5)	87-97%	87-98%	101-111%	107-117%

Recovery:

Sample Type	Average(%)	Recovery Range(%)
Serum	100	94-106
Plasma	102	96-108

Function:

(Microbial infection) Recognition of M.tuberculosis by dendritic cells may occur partially via this molecule (PubMed:17158455, PubMed:21203928). Can recognize, bind, and opsonize pathogens to enhance their elimination by alveolar macrophages (PubMed:21123169).

Uniprot:	Q8IWL2
Sample Type:	Serum, plasma, tissue homogenates, cell culture supernates and other biological fluids
Specificity:	Natural and recombinant human Pulmonary surfactant-associated protein A1
Sub Unit:	(Microbial infection) Binds M.bovis cell surface protein Apa via its glycosylated sites; probably also recognizes other bacterial moieties (PubMed:17158455). Binds to the S.aureus extracellular adherence protein, Eap, thereby enhancing phagocytosis and killing of S.aureus by alveolar macrophages (PubMed:21123169).
Research Area:	Signal Transduction
Subcellular Location:	Secreted Extracellular space Extracellular matrix Secreted Extracellular space Surface film
Storage:	Please see kit components below for exact storage details
Note:	For research use only

UniProt Protein Function:	SFTPA1B: In presence of calcium ions, it binds to surfactant phospholipids and contributes to lower the surface tension at the air-liquid interface in the alveoli of the mammalian lung and is essential for normal respiration. Genetic variations in SFTPA1 are a cause of susceptibility to pulmonary fibrosis idiopathic (IPF). Pulmonary fibrosis is a lung disease characterized by shortness of breath, radiographically evident diffuse pulmonary infiltrates, and varying degrees of inflammation and fibrosis on biopsy. It results in acute lung injury with subsequent scarring and endstage lung disease. Genetic variations in SFTPA1 are a cause of susceptibility to respiratory distress syndrome in premature infants (RDS); also known as RDS in prematurity. RDS is a lung disease affecting usually premature newborn infants. It is characterized by deficient gas exchange, diffuse atelectasis, high-permeability lung edema and fibrin-rich alveolar deposits called 'hyaline membranes'. The association between SFTPA1 alleles and respiratory distress syndrome in premature infants is dependent on a variation Ile to Thr at position 131 in SFTPB. Belongs to the SFTPA family.
UniProt Protein Details:	Protein type:Secreted; Secreted, signal peptide Chromosomal Location of Human Ortholog: 10q22.3 Cellular Component: extracellular space; proteinaceous extracellular matrix; collagen; extracellular region Molecular Function:lipid transporter activity; carbohydrate binding Biological Process: respiratory gaseous exchange; lipid transport Disease: Pulmonary Fibrosis, Idiopathic
NCBI Summary:	This gene encodes a lung surfactant protein that is a member of a subfamily of C-type lectins called collectins. The encoded protein binds specific carbohydrate moieties found on lipids and on the surface of microorganisms. This protein plays an essential role in surfactant homeostasis and in the defense against respiratory pathogens. Mutations in this gene are associated with idiopathic pulmonary fibrosis. Alternate splicing results in multiple transcript variants. [provided by RefSeq, May 2010]
UniProt Code:	Q8IWL2
NCBI GenInfo Identifier:	60416440
NCBI Gene ID:	653509
NCBI Accession:	Q8IWL2.2
UniProt Secondary Accession:	Q8IWL2,P07714, Q14DV4, Q5RIR5, Q5RIR7, A8K3T8, B7ZW50 E3VLD8, E3VLD9, E3VLE0, E3VLE1, G5E9J3,
UniProt Related Accession:	Q8IWL2
Molecular Weight:	27,736 Da
NCBI Full Name:	Pulmonary surfactant-associated protein A1
NCBI Synonym Full Names:	surfactant protein A1
NCBI Official Symbol:	SFTPA1
NCBI Official Synonym Symbols:	SPA; PSAP; PSPA; SP-A; SPA1; PSP-A; SFTP1; SP-A1; COLEC4; SFTPA1B
NCBI Protein Information:	pulmonary surfactant-associated protein A1; collectin-4; surfactant protein A1B; alveolar proteinosis protein; surfactant protein A1 variant AD' 6A; surfactant protein A1 variant ACD' 6A; surfactant protein A1 variant AD' 6A2; surfactant protein A1 variant AD' 6A3; surfactant protein A1 variant AD' 6A4; surfactant protein A1 variant AB'D' 6A; surfactant protein A1 variant ACD' 6A2; surfactant protein A1 variant ACD' 6A3; surfactant protein A1 variant ACD' 6A4; surfactant protein A1 variant AB'D' 6A2; surfactant protein A1 variant AB'D' 6A3; surfactant protein A1 variant AB'D' 6A4; surfactant, pulmonary-associated protein A1A; surfactant, pulmonary-associated protein A1B; 35 kDa pulmonary surfactant-associated protein
UniProt Protein Name:	Pulmonary surfactant-associated protein A1
UniProt Synonym Protein Names:	35 kDa pulmonary surfactant-associated protein; Alveolar proteinosis protein; Collectin-4
Protein Family:	Pulmonary surfactant-associated protein
UniProt Gene Name:	SFTPA1
UniProt Entry Name:	SFTA1_HUMAN

Component	Quantity (96 Assays)	Storage
ELISA Microplate (Dismountable)	8×12 strips	-20°C
Lyophilized Standard	2	-20°C
Sample Diluent	20ml	-20°C
Assay Diluent A	10mL	-20°C
Assay Diluent B	10mL	-20°C
Detection Reagent A	120µL	-20°C
Detection Reagent B	120µL	-20°C
Wash Buffer	30mL	4°C
Substrate	10mL	4°C
Stop Solution	10mL	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

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

Allow all reagents to reach room temperature (Please do not dissolve the reagents at 37°C directly). All the reagents should be mixed thoroughly by gently swirling before pipetting. Avoid foaming. Keep appropriate numbers of strips for 1 experiment and remove extra strips from microtiter plate. Removed strips should be resealed and stored at -20°C until the kits expiry date. Prepare all reagents, working standards and samples as directed in the previous sections. Please predict the concentration before assaying. If values for these are not within the range of the standard curve, users must determine the optimal sample dilutions for their experiments. We recommend running all samples in duplicate.

Step
1.	Add Sample: Add 100µL of Standard, Blank, or Sample per well. The blank well is added with Sample diluent. Solutions are added to the bottom of micro ELISA plate well, avoid inside wall touching and foaming as possible. Mix it gently. Cover the plate with sealer we provided. Incubate for 120 minutes at 37°C.
2.	Remove the liquid from each well, don't wash. Add 100µL of Detection Reagent A working solution to each well. Cover with the Plate sealer. Gently tap the plate to ensure thorough mixing. Incubate for 1 hour at 37°C. Note: if Detection Reagent A appears cloudy warm to room temperature until solution is uniform.
3.	Aspirate each well and wash, repeating the process three times. Wash by filling each well with Wash Buffer (approximately 400µL) (a squirt bottle, multi-channel pipette,manifold dispenser or automated washer are needed). Complete removal of liquid at each step is essential. After the last wash, completely remove remaining Wash Buffer by aspirating or decanting. Invert the plate and pat it against thick clean absorbent paper.
4.	Add 100µL of Detection Reagent B working solution to each well. Cover with the Plate sealer. Incubate for 60 minutes at 37°C.
5.	Repeat the wash process for five times as conducted in step 3.
6.	Add 90µL of Substrate Solution to each well. Cover with a new Plate sealer and incubate for 10-20 minutes at 37°C. Protect the plate from light. The reaction time can be shortened or extended according to the actual color change, but this should not exceed more than 30 minutes. When apparent gradient appears in standard wells, user should terminatethe reaction.
7.	Add 50µL of Stop Solution to each well. If color change does not appear uniform, gently tap the plate to ensure thorough mixing.
8.	Determine the optical density (OD value) of each well at once, using a micro-plate reader set to 450 nm. User should open the micro-plate reader in advance, preheat the instrument, and set the testing parameters.
9.	After experiment, store all reagents according to the specified storage temperature respectively until their expiry.

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.

ELISA	Antibodies
Human SPA (Pulmonary Surfactant Associated Protein A) ELISA Kit (HUES02324)	Anti-SFTPA1 Antibody (CAB3133)
	SFT2D3 Antibody (PACO12153)
	SNX20 Antibody (PACO17141)
	PLAT Antibody (PACO18915)
	SFTPA1 Antibody (PACO18916)