SIRPA Recombinant Monoclonal Antibody

Code: CSB-RA443117A0HU

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Size:

50μl100μl

US$210

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Species Reactivity: Human

Application: ELISA, IHC, FC

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Target Background

Product Details

Uniprot NO.

P78324

Target Names

SIRPA

Alternative Names

Tyrosine-protein phosphatase non-receptor type substrate 1 (SHP substrate 1) (SHPS-1) (Brain Ig-like molecule with tyrosine-based activation motifs) (Bit) (CD172 antigen-like family member A) (Inhibitory receptor SHPS-1) (Macrophage fusion receptor) (MyD-1 antigen) (Signal-regulatory protein alpha-1) (Sirp-alpha-1) (Signal-regulatory protein alpha-2) (Sirp-alpha-2) (Signal-regulatory protein alpha-3) (Sirp-alpha-3) (p84) (CD antigen CD172a), SIRPA, BIT MFR MYD1 PTPNS1 SHPS1 SIRP

Species Reactivity

Human

Immunogen

A synthesized peptide derived from Human SIRPA

Conjugate

Non-conjugated

Clonality

Monoclonal

Isotype

Rabbit IgG

Clone No.

3C3

Purification Method

Affinity-chromatography

Concentration

It differs from different batches. Please contact us to confirm it.

Buffer

Rabbit IgG in 10mM phosphate buffered saline , pH 7.4, 150mM sodium chloride, 0.05% BSA, 0.02% sodium azide and 50% glycerol.

Form

Liquid
Note: We will preferentially ship the format that we have in stock, however, if you have any special requirement for the format, please remark your requirement when placing the order, we will prepare according to your demand.

Scope Application

ELISA Protocol Immunohistochemistry (IHC) Protocol Flow Cytometry (FC) Protocol

Recommended Dilution

Application	Recommended Dilution
IHC	1:50-1:200
FC	1:50-1:200

Storage

Upon receipt, store at -20°C or -80°C. Avoid repeated freeze.

Lead Time

Basically, we can dispatch the products out in 1-3 working days after receiving your orders. Delivery time maybe differs from different purchasing way or location, please kindly consult your local distributors for specific delivery time.
Note: All of our proteins are default shipped with normal blue ice packs, if you request to ship with dry ice, please communicate with us in advance and extra fees will be charged.

Usage

For Research Use Only. Not for use in diagnostic or therapeutic procedures.

Datasheet & COA

Antibody FAQs

Images

IHC image of CSB-RA443117A0HU diluted at 1:50 and staining in paraffin-embedded human stomach tissue performed on a Leica BondTM system. After dewaxing and hydration, antigen retrieval was mediated by high pressure in a citrate buffer (pH 6.0). Section was blocked with 10% normal goat serum 30min at RT. Then primary antibody (1% BSA) was incubated at 4°C overnight. The primary is detected by a Goat anti-rabbit polymer IgG labeled by HRP and visualized using 0.13% DAB.
IHC image of CSB-RA443117A0HU diluted at 1:50 and staining in paraffin-embedded human rectal cancer performed on a Leica BondTM system. After dewaxing and hydration, antigen retrieval was mediated by high pressure in a citrate buffer (pH 6.0). Section was blocked with 10% normal goat serum 30min at RT. Then primary antibody (1% BSA) was incubated at 4°C overnight. The primary is detected by a Goat anti-rabbit polymer IgG labeled by HRP and visualized using 0.13% DAB.
Overlay Peak curve showing U937 cells surface stained with CSB-RA443117A0HU (red line) at 1:50. Then 10% normal goat serum to block non-specific protein-protein interactions followed by the antibody (1µg/1*10⁶cells) for 45min at 4℃. The secondary antibody used was FITC-conjugated Goat Anti-rabbit IgG(H+L) at 1:200 dilution for 35min at 4℃.Control antibody (green line) was rabbit IgG (1µg/1*10⁶cells) used under the same conditions. Acquisition of >10,000 events was performed.

Description

Signal-regulatory protein alpha (SIRPA), also known as CD172a or SHPS-1, serves as a critical immunoregulatory receptor that mediates the "don't eat me" signal through its interaction with CD47. This inhibitory pathway plays a fundamental role in macrophage-mediated phagocytosis and has emerged as a significant target in immuno-oncology research, where disrupting the SIRPA-CD47 axis can enhance tumor cell clearance. Beyond cancer immunology, SIRPA participates in neuronal signaling, cardiovascular regulation, and broader signal transduction pathways, making it a protein of interest across multiple research disciplines.

This recombinant monoclonal antibody, clone 3C3, offers the consistency and reproducibility that demanding experimental workflows require. Generated against a synthetic peptide derived from human SIRPA and produced in rabbit host, the recombinant format ensures sequence-defined specificity and eliminates the lot-to-lot variability that can complicate longitudinal studies or multi-site collaborations. Affinity chromatography purification delivers a reagent ready for sensitive detection applications.

Validation studies demonstrate reliable performance across complementary techniques. Immunohistochemistry testing in paraffin-embedded human tissues, including normal stomach and rectal cancer specimens, confirms robust detection in FFPE workflows using standard citrate buffer antigen retrieval at dilutions of 1:50 to 1:200. Flow cytometry analysis using U937 cells, a human monocytic cell line, shows clear positive staining compared to isotype controls, supporting surface expression studies at similar dilution ranges.

Whether investigating macrophage biology, exploring checkpoint pathways in tumor microenvironments, or characterizing SIRPA expression patterns in cardiovascular or neurological contexts, this antibody provides a dependable tool for advancing your research objectives.

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Target Background

Function(From Uniprot)

Immunoglobulin-like cell surface receptor for CD47. Acts as docking protein and induces translocation of PTPN6, PTPN11 and other binding partners from the cytosol to the plasma membrane. Supports adhesion of cerebellar neurons, neurite outgrowth and glial cell attachment. May play a key role in intracellular signaling during synaptogenesis and in synaptic function. Involved in the negative regulation of receptor tyrosine kinase-coupled cellular responses induced by cell adhesion, growth factors or insulin. Mediates negative regulation of phagocytosis, mast cell activation and dendritic cell activation. CD47 binding prevents maturation of immature dendritic cells and inhibits cytokine production by mature dendritic cells.

Gene References into Functions

Accumulation of SIRPalpha-inhibited macrophages in tumors favored tumor regression for 1-2 weeks, but donor macrophages quickly differentiated toward non-phagocytic, high-SIRPalpha TAMs. PMID:28669759
SIRP alpha protein is under-expressed in low and high-grades of astrocytoma from patients' brain samples. PMID:27900675
Anti-SIRPA antibody immunotherapy enhances neutrophil and macrophage antitumor activity. PMID:29158380
SIRPalpha might play an important role in the progression of oral leukoplakia and oral cancer, and could be a pivotal therapeutic target in oral squamous cell carcinoma, regulating the phenotype of macrophages via targeting NF-kappaB signaling. PMID:27793032
TTI-621 (SIRPalphaFc) is a fully human recombinant fusion protein that blocks the CD47-SIRPalpha axis by binding to human CD47 and enhancing phagocytosis of malignant cells..These data indicate that TTI-621 is active across a broad range of human tumors. PMID:27856600
data suggest that TTI-621 may be efficacious in triggering the destruction of cancer cells by a diverse population of TAMs found in vivo and support possible combination approaches to augment the activity of CD47 blockade PMID:29084248
CD47, TSP1, and to a lesser extent SIRPalpha facilitate exosome-mediated myeloid-derived suppressor cells chemotaxis and migration. PMID:27728760
exploited by Hepatitis E virus to negative regulated IFN-beta of the host innate immune system to promote viral infection PMID:26492885
Data suggest a reduction in the CD47 antigen/signal-regulatory protein alpha (SIRPalpha) pathway by programmed cell death protein 1 (PD-1) blockade, which regulates Myeloid-derived suppressor cells (MDSCs) and tumor associated macrophages (TAMs). PMID:26573233
agents that block the CD47:SIRP-alpha engagement are attractive therapeutic targets as a monotherapy or in combination with additional immune-modulating agents for activating antitumor T cells in vivo PMID:26116271
the data suggest that combinatorial actions of ADAM10 and gamma-secretase on SIRPalpha cleavage promote inflammatory signaling. PMID:26534964
Loss of cell surface CD47 clustering formation and binding avidity to SIRPalpha facilitate apoptotic cell clearance by macrophages. PMID:26085683
Velcro" engineering of high affinity CD47 ectodomain as signal regulatory protein alpha (SIRPalpha) antagonists that enhance antibody-dependent cellular phagocytosis PMID:25837251
negatively regulates neutrophil accumulation during inflammation PMID:24516072
Combinatorial expression of NKX2-5, SIRPA, VCAM1 and CD34 can be used to define discrete stages of cardiovascular cell lineage differentiation. PMID:24968096
These results suggest that thrombospondin-1 binding to SIRP-alpha on nonphagocytic cells activates NADPH oxidase, limits vasodilation, and promotes renal ischemia reperfusion injury. PMID:24511121
'clustering' SIRPalpha into plasma membrane microdomains is essential for activated monocytes and macrophages to effectively interact with CD47 and initiate intracellular signaling PMID:24143245
Polymorphisms in the human inhibitory signal-regulatory protein alpha do not affect binding to its ligand CD47. PMID:24550402
SIRPA plays a protective role in cardiac hypertrophy through negative regulation of the Toll-like receptor 4/nuclear factor-kappaB pathway. PMID:24101669
These results demonstrate a SIRPalpha-based mechanism that dynamically regulates polymorphonuclear leukocyte inflammatory responses. PMID:24026300
Signal regulatory protein alpha is associated with tumor-polarized macrophages phenotype switch and plays a pivotal role in tumor progression. PMID:23504854
An avidity-improved CD47 fusion protein (CD47-Var1) suppresses the release of a wide array of inflammatory cytokines by CD172a(+) cells. PMID:23669395
Expression of SIRPalpha on two low SIRPalpha acute myeloid leukemia (AML) expressing cell lines could be upregulated upon differentiation of the cells. PMID:23320069
SHPS-1 negatively regulates the MyD88-dependent TLR signaling pathway through the inhibition of NF-kappaB activation PMID:23314616
IFN-beta and IFN-gamma/TNF-alpha decrease erythrophagocytosis by human monocytes in vitro, and this effect does not apparently require an increase in SIRP-alpha or SHP-1 expression. PMID:22738830
neutrophils reduce their SIRPalpha expression during apoptosis, which may be part of the functional down-regulation seen in apoptotic neutrophils. PMID:23271705
thymic Sirpalpha(+) cDCs crucially contribute to a process of intrathymic tumor immune tolerance that involves CCR2 and CCL2 PMID:22815949
In the glomeruli of CNS patients carrying mutations in NPHS1, where SD formation is disrupted, the expression of SIRPalpha as well as Neph1 and nephrin was significantly decreased, indicating that SIRPalpha is closely associated with the nephrin complex PMID:22747997
Surfactant protein D (Sp-D) binds to membrane-proximal domain (D3) of signal regulatory protein alpha (SIRPalpha), a site distant from binding domain of CD47, while also binding to analogous region on signal regulatory protein beta (SIRPbeta). PMID:22511785
SIRPalpha1 in hepatic sinusoid Kupffer cells is associated with the extent of autoimmune hepatitis. PMID:22409853
data, taken together with similar findings with other human neoplasms, show that CD47 is a commonly expressed molecule on all cancers, its function to block phagocytosis is known, and blockade of its function leads to tumor phagocytosis and elimination PMID:22451913
SIRPalpha/CD172a and FHOD1 are unique markers of littoral cells, a recently evolved major cell population of red pulp of human spleen. PMID:22490440
Sensing of cell surface CD47 expression by phagocyte SIRPalpha is a critical determinant of T- and natural killer-cell homeostasis under steady-state conditions in vivo. PMID:21788504
hSIRPa-transgenic Rag2(-/-)gamma(c)(-/-) mice represent a unique mouse strain supporting high levels of human cell engraftment. PMID:21788509
The prolactin receptor (PRLr)-SIRPalpha-integrin complex provides a basis for integrin-PRLr cross-talk that contributes to the biology of breast cancer. PMID:20826546
the relationships between SIRPalpha1 and beta-catenin in leukemia cells. PMID:21369691
Single Nucleotide Polymorphisms in PTPNS1 is associated with inflammatory bowel disease. PMID:21225905
SHP-2 as an essential component of tumor suppression and anoikis mediated by SIRPalpha1 in human breast carcinoma cells as well as in v-Src-transformed cells. PMID:21169408
Poor prognosis of breast cancer patients with high expression of CD47 is due to an active CD47/SIRPA signaling pathway in circulating cells. PMID:20705613
The role of cis dimerization of signal regulatory protein alpha (SIRPalpha) in binding to CD47. PMID:20826801
Findings reveal a novel mechanism for recruitment of PDK1 to the SHPS-1 signaling complex, which is required for IGF-I-stimulated AKT Thr(308) phosphorylation and inhibition of apoptosis. PMID:20643654
Inhibition of engulfment correlates with affinity of CD47 for SIRPA - but only at low levels of CD47. PMID:20299253
SIRPalpha1 specifically affects the SHP-2/FAK/Grb2/Sos-1/MAPK activation loop to downmodulate EGFRvIII-mediated migration and transformation. PMID:20473329
Insulin-like growth factor-I-stimulated insulin receptor substrate-1 negatively regulates Src homology 2 domain-containing protein-tyrosine phosphatase substrate-1 function in vascular smooth muscle cells. PMID:20207740
SIRP alpha gene expression is higher in monocytes from autoimmune hemolytic anemia patients, compared with basal expression. PMID:19874234
CD47/SIRP-alpha interactions are implicated in the pathogenesis of DC-driven allergic airway inflammation. PMID:19748659
Signal regulatory protein (SIRPalpha), a cellular ligand for CD47, regulates neutrophil transmigration PMID:11792697
The interaction of SHPS-1 with CD47 may contribute to the recruitment of B lymphocytes via endothelial cells under steady state conditions. PMID:11907074
MyD-1-coupling to this PI 3-kinase-dependent signaling pathway may therefore present a novel target for the development of therapeutic strategies for combating TNFalpha production and consequent inflammatory disease. PMID:12805067
Expression of SIRPalpha1 on astrocytomas may be of considerable importance in brain tumor biology. PMID:14729615

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Subcellular Location

Membrane; Single-pass type I membrane protein.

Tissue Specificity

Ubiquitous. Highly expressed in brain. Detected on myeloid cells, but not T-cells. Detected at lower levels in heart, placenta, lung, testis, ovary, colon, liver, small intestine, prostate, spleen, kidney, skeletal muscle and pancreas.

Database Links

HGNC: 9662

UNIGENE: Hs.581021

KEGG: hsa:140885

STRING: 9606.ENSP00000348307

OMIM: 602461

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