| 货号 | AF3939-SP |
| 别名 | CD89 antigen; CD89; CD89IgA Fc receptor; Fc alpha receptor; Fc fragment of IgA, receptor for; immunoglobulin alpha Fc receptor | 全称 | IgA Fc Receptor |
| 反应种属 | Human |
| 应用 | Western Blot(0.1 µg/mL) Flow Cytometry(0.25 µg/106cells) |
| 目标/特异性 | Detects human FCAR/CD89 in direct ELISAs and Western blots. In direct ELISAs and Western blots, less than 1% cross‑reactivity with recombinant human (rh) Fc gamma R1 alpha, rhFc gamma R2 alpha, and rhFc gamma R3 beta is observed. |
| 使用方法 | Western Blot: 0.1 µg/mL Flow Cytometry: 0.25 µg/106cells |
| 来源 | Reconstitute at 0.2 mg/mL in sterile PBS. |
| 产品组分 |
| 供应商 | R&D Systems |
| Entrez Gene IDs | 2204 (Human); 365183 (Rat); 102145896 (Cynomolgus Monkey) |
| 纯化方式 | Antigen Affinity-purified |
| 免疫原 | Mouse myeloma cell line NS0-derived recombinant human FCAR/CD89 Gln22-Asn227 Accession # P24071 |
| 内毒素水平 | <0.10 EU per 1 μg of the antibody by the LAL method. |
| 生物活性 | Human |
| 标记 | Unconjugated |
| 溶解方法 | Reconstitute at 0.2 mg/mL in sterile PBS. |
| 背景 | FCAR, also called Fc alpha RI or CD89, is a variably glycosylated 50‑100 kDa myeloid-specific type I transmembrane (TM) Fc receptor for IgA that is a member of the multichain immune recognition receptor (MIRR) family (1‑3). Human FCAR contains a 21 amino acid (aa) signal sequence and extracellular (ECD), TM and cytoplasmic domains of 206, 19 and 41 aa, respectively (4). Arg230 within the TM domain supports interaction with the ITAM-containing signaling subunit, FcR gamma, which contains a TM Asp (5‑7). Two ECD C2-type Ig-like domains (EC1 and 2) are oriented at right angles (8). Up to two molecules of FCAR can bind one molecule of serum IgA via EC1 (8). Many splice variants have been reported, but only two have been identified as proteins (9, 10). The a.2 form, which lacks 22 aa just prior to the TM domain, is exclusively expressed in alveolar macrophages. The a.3 form lacks EC2. FCAR binds monomeric, polymeric and secretory IgA, but does not mediate the barrier function of secretory IgA in mucosal epithelium (1‑3). Shedding and circulation of polymeric IgA/FCAR immune complexes has been reported (11). Circulating neutrophils, eosinophils, and monocytes express FCAR (12). Tissue expression of FCAR is mainly from neutrophils; FCAR is downregulated as monocytes differentiate to tissue macrophages (12). On neutrophils, a significant amount of FCAR lacks FcR gamma, but can still be endocytosed to early endosomes and recycled to the cell surface (5). Binding of serum IgA to FCAR is transient and anti-inflammatory, inhibiting IgG or IgE-induced degranulation (6). Sustained aggregation of FCAR results in inflammatory responses (6). FcR gamma signaling is required for these and for transport to late endosomes (5 - 7). Human FCAR shows 55‑58% aa identity with rat, horse and cow FCAR. No ortholog occurs in mouse. FCAR structure resembles the KIR/ILT/LIR/MIR family more than other IgA receptors, including pIgR, Fc alpha /μR, asialoglycoprotein receptor (ASGR1) and transferrin receptor (TfR) (1‑3). |
| 运输条件 | Blue Ice |
| 存放说明 | 4℃ |
| 参考文献 |
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Detection of FCAR/CD89 in Human Monocytes and Granulocytes by Flow Cytometry. Human whole blood monocytes and granulocytes were stained with Sheep Anti-Human FCAR/CD89 Antigen Affinity-purified Polyclonal Antibody (Catalog # AF3939, filled histogram) or isotype control antibody (Catalog # 5-001-A, open histogram), followed by NorthernLights™ 557-conjugated Anti-Sheep IgG Secondary Antibody (Catalog # NL010). |
