human prosaposin(PSAP)Elisa kit

Code CSB-E12837h
Size 96T,5×96T,10×96T
Trial Size 24T ELISA kits trial application
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Product Details

Target Name prosaposin
Alternative Names A1 activator ELISA Kit; Cerebroside sulfate activator ELISA Kit; Co-beta-glucosidase ELISA Kit; Component C ELISA Kit; CSAct ELISA Kit; Dispersin ELISA Kit; GLBA ELISA Kit; Glucosylceramidase activator ELISA Kit; Proactivator polypeptide ELISA Kit; Proactivator polypeptide precursor ELISA Kit; Prosaposin (sphingolipid activator protein 1) ELISA Kit; prosaposin (variant Gaucher disease and variant metachromatic leukodystrophy) ELISA Kit; Prosaposin ELISA Kit; Protein A ELISA Kit; Protein C ELISA Kit; PSAP ELISA Kit; SAP 1 ELISA Kit; SAP 2 ELISA Kit; SAP-1 ELISA Kit; SAP-2 ELISA Kit; SAP_HUMAN ELISA Kit; SAP1 ELISA Kit; Saposin A ELISA Kit; Saposin B ELISA Kit; Saposin B Val ELISA Kit; Saposin C ELISA Kit; Saposin D ELISA Kit; Saposin-D ELISA Kit; Saposins ELISA Kit; Sgp1 ELISA Kit; Sphingolipid activator protein 1 ELISA Kit; Sphingolipid activator protein 2 ELISA Kit; Sulfated glycoprotein 1 ELISA Kit; Sulfatide/GM1 activator ELISA Kit
Abbreviation PSAP
Uniprot No. P07602
Species Homo sapiens (Human)
Sample Types serum, plasma, tissue homogenates
Detection Range 0.625 ng/mL-20 ng/mL
Sensitivity 0.312 ng/mL
Assay Time 1-5h
Sample Volume 50-100ul
Detection Wavelength 450 nm
Research Area Metabolism
Assay Principle quantitative
Measurement Sandwich
Intra-assay Precision (Precision within an assay): CV%<15%      
Three samples of known concentration were tested twenty times on one plate to assess.  
Inter-assay Precision (Precision between assays): CV%<20%      
Three samples of known concentration were tested in twenty assays to assess.    
To assess the linearity of the assay, samples were spiked with high concentrations of human PSAP in various matrices and diluted with the Sample Diluent to produce samples with values within the dynamic range of the assay.
  Sample Serum(n=4)  
1:1 Average % 101  
Range % 92-105  
1:2 Average % 88  
Range % 82-91  
1:4 Average % 103  
Range % 98-107  
1:8 Average % 96  
Range % 90-100  
The recovery of human PSAP spiked to levels throughout the range of the assay in various matrices was evaluated. Samples were diluted prior to assay as directed in the Sample Preparation section.
Sample Type Average % Recovery Range  
Serum (n=5) 92 87-97  
EDTA plasma (n=4) 87 82-93  
Typical Data
These standard curves are provided for demonstration only. A standard curve should be generated for each set of samples assayed.
ng/ml OD1 OD2 Average    
20 2.226 2.105 2.166    
10 1.347 1.323 1.335    
5 0.659 0.666 0.663    
1.25 0.193 0.201 0.197    
0.625 0.100 0.105 0.103    
and FAQs
Storage Store at 2-8°C. Please refer to protocol.
Lead Time 3-5 working days

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Target Data

Function Saposin-A and saposin-C stimulate the hydrolysis of glucosylceramide by beta-glucosylceramidase (EC and galactosylceramide by beta-galactosylceramidase (EC Saposin-C apparently acts by combining with the enzyme and acidic lipid to form an activated complex, rather than by solubilizing the substrate.; FUNCTION
Gene References into Functions
  1. Accumulating evidence suggests that PGRN is essential for proper lysosomal function, but the precise mechanisms involved are not known. Here, we show that PGRN facilitates neuronal uptake and lysosomal delivery of prosaposin (PSAP), the precursor of saposin peptides that are essential for lysosomal glycosphingolipid degradation. PMID: 28541286
  2. Both PSAP reduction and overexpression lead to significantly elevated extracellular progranulin (PGRN) levels. Intriguingly, PSAP knockdown increases PGRN monomers, whereas PSAP overexpression increases PGRN oligomers, partly through a protein-protein interaction. PMID: 27356620
  3. Study demonstrated that the binding of CST3 and PSAP decreased the inhibitory effects of CST3 on proteinase in vitro. The co-localization of both proteins was detected in cultured cells and in Bunina body-containing motor neurons from patients with amyotrophic lateral sclerosis, suggesting that they might be involved in the process of Bunina body formation. PMID: 29249381
  4. This report documents the successful use of plasma lysoSLs profiling in the PSAP deficiency diagnosis, as a reliable and informative tool to obtain a preliminary information in infantile cases with complex traits displaying severe neurological signs and visceral involvement. PMID: 26831127
  5. an extensive review of all the PSAP-causative variants published in the literature to date, accounting for a total of 10 PSAP allele types (review) PMID: 26462614
  6. Our findings suggest a novel pharmacological approach to Sap C deficiency directed to treat major secondary pathological aspects in this disorder. PMID: 25926625
  7. PSAP is a secreted biomarker. PMID: 26341737
  8. Data suggested that the abundance of Psap in sperm sample may be a sensitive endpoint to predict PCB exposure. PMID: 26045750
  9. Prosaposin facilitates sortilin-independent lysosomal trafficking of progranulin. PMID: 26370502
  10. findings support a lung metastasis-promoting function of the miR-23b/27b/24 cluster of miRNAs, which functions in part through the direct inhibition of PSAP in breast cancer PMID: 24966325
  11. Of the 2575 proteins identified, proteins upregulated in gallbladder cancer included several lysosomal proteins such as prosaposin, cathepsin Z and cathepsin H. PMID: 24657443
  12. Saposin C protects glucocerebrosidase against alpha-synuclein inhibition. PMID: 24070323
  13. Urine of patients with early prostate cancer contains lower levels of light chain fragments of inter-alpha-trypsin inhibitor and prosaposin fragment or saposin B. PMID: 23417432
  14. These findings suggested that prosaposin might enhance estrogen receptor alpha-mediated signaling axis and play a role in breast cancer development and progression. PMID: 22738294
  15. PSAP is a novel TFPI-2-interacting protein and that the binding sites are the KD2 of TFPI-2 and the C-terminus of PSAP. PMID: 21943334
  16. novel esophageal squamous cell carcinoma marker PSAP was identified by mass spectrometry and immunohistochemical analysis PMID: 21743296
  17. PSAP is a target gene of the BACH1 transcription factor according to ChIP-seq analysis in HEK 293 cells. PMID: 21555518
  18. saposin C caused stimulation of androgen receptor expression and activity by associations with Src kinases PMID: 21328455
  19. Saposin B(Sap B) is not a limiting factor of the coupled Sap B-arylsulfatase A reaction in mouse kidney cells even if sulfatide has accumulated to unphysiologically high levels PMID: 19224915
  20. The biological properties of cells from four recently described Gaucher disease patients carrying mutations in the Sap C domain of the PSAP gene have been characterized. PMID: 20484222
  21. PSAP is involved in prostate cancer invasion. PMID: 20132547
  22. reconstruction of the order of internal duplications that gave rise to the four saposins by using phylogenetic tools PMID: 11734895
  23. procathepsin D interacts with prosaposin in human breast and ovarian cancer cells. PMID: 12083803
  24. crystal structure reveals a dimeric shell for lipid binding PMID: 12518053
  25. data indicate that saposin C is required for acid beta-glucosidase resistance to proteolytic degradation in the cell PMID: 12813057
  26. The structure of saposin C compared to other saposin-fold family members provides an explanation for function variability of this protein family. PMID: 14674747
  27. model proposed in which saposin C exposes lipid antigens from intralysosomal membranes for loading onto CD1b PMID: 14716313
  28. There might be a potential pleuripotent regulatory function for prosaposin in prostate cancer. PMID: 15305334
  29. Amplification and overexpression of PSAP was studied in prostatic neoplasms. PMID: 16080200
  30. determination of crystal structure of human saposins A and C to 2.0 Angstroms and 2.4 Angstroms, respectively and both reveal the compact, monomeric saposin fold PMID: 16823039
  31. FSAP (Factor VII-activating protease) can cleave and inactivate PDGF-BB (platelet-derived growth factor-BB) and thereby inhibits VSMC (vascular smooth-muscle cell) proliferation. PMID: 17300216
  32. saposin B may facilitate lipid binding to CD1d molecules throughout the endocytic pathway PMID: 17372201
  33. an unglycosylated Sap-B variant, Asn215His, which causes a fatal sphingolipid storage disease, lost the ability to extract membrane lipids at acidic pH in the presence of BMP PMID: 17561962
  34. Expression of saposin C-originated saposin C may upregulate AR gene expression and activate the androgen receptor transcriptional function in an androgen-independent manner in prostate cancer cells. PMID: 17712477
  35. These data for the first time demonstrate that not only saposin C or PSAP regulates AR expression/activity, but also function as an androgen-regulated gene in prostate stromal cells. PMID: 18481277
  36. findings point to the role of lipid rafts in the prosaposin-triggered signalling pathway, thus supporting a role for this factor as a new component of the multimolecular signalling complex involved in the neurotrophic response. PMID: 18761669
  37. two new patients with PSAP gene defects; one, with pSap-d, who had a severe neurovisceral dystrophy and died as a neonate, and the other with SapB-d, who presented with a metachromatic leukodystrophy-like disorder but had normal arylsulfatase activity PMID: 19267410
  38. Report the up-regulation of prosaposin in the senescent fibroblasts and endothelial cells. PMID: 19471889
  39. Prosaposin functions in a paracrine and endocrine fashion by stimulating the expression of thrombospondin-1 (Tsp-1) in fibroblasts present in both primary tumors and distant organs, doing so in a p53-dependent manner. PMID: 19581582
  40. Saposin C or its precursor (PSAP) function as an androgen-agonist and upregulate androgen receptor and prostate-specific antigen expression/activity in androgen-responsive prostate cancer cells LNCaP, TRAMP-C1 and -C2., and CWR 22RV1. PMID: 17044040
  41. Prosaposin is an androgen-target gene and its expression in androgen-responsive prostate cancer cells can be upregulated by male hormones. PMID: 17171640
  42. Cloning of prosaposin gene from androgen-independent (AI) prostate cancer (PCa) cells and it genomic amplification in human metastatic AI PCa cell lines and punch biopsy samples of prostate cancer xenografts and lymph node metastases. PMID: 16080200
  43. Saposin C stimulates prostate cancer and stromal cells growth and invasion and uPA/uPAR expression, and activates p42/44 and SAPK/JNK signaling pathways of MAPK. PMID: 15897971
  44. Prosaposin and/or saposin C via modulation of caspases expression/activity and/or PI3K/Akt signaling pathway act as a survival and anti-apoptotic factor for prostate cancer cells. PMID: 15548330

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Involvement in disease Combined saposin deficiency (CSAPD); Leukodystrophy metachromatic due to saposin-B deficiency (MLD-SAPB); Gaucher disease, atypical, due to saposin C deficiency (AGD); Krabbe disease, atypical, due to saposin A deficiency (AKRD)
Subcellular Location Lysosome, SUBCELLULAR LOCATION: Prosaposin: Secreted
Database Links

HGNC: 9498

OMIM: 176801

KEGG: hsa:5660

STRING: 9606.ENSP00000378394

UniGene: Hs.523004


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