Polymeric immunoglobulin receptor (pIgR) is a transmembrane protein that in humans is encoded by the PIGR gene. It is an Fc receptor which facilitates the transcytosis of the soluble polymeric isoforms of immunoglobulin A and immunoglobulin M (pIg) and immune complexes. pIgRs are mainly located on the epithelial lining of mucosal surfaces of the gastrointestinal tract. The composition of the receptor is complex, including 6 immunoglobulin-like domains, a transmembrane region, and an intracellular domain. pIgR expression is under the strong regulation of cytokines, hormones, and pathogenic stimuli.
Background References
1. Chae J et al. Polymeric immunoglobulin receptor (pIgR) in cancer. J Cancer Res Clin Oncol. 2023 Dec
2. Zingoni A et al. PIGR-enriched circulating vesicles contributes to hepatocellular carcinoma aggressiveness. J Hepatol. 2022 Apr
Western blot analysis of PIGR on different lysates with Rabbit anti-PIGR antibody (HA723953) at 1/5,000 dilution.
Lane 1: A431 cell lysate Lane 2: A549 cell lysate (negative)
Lysates/proteins at 20 µg/Lane.
Predicted band size: 83 kDa Observed band size: 70-100 kDa
Exposure time: 42 seconds; ECL: K1801;
4-20% SDS-PAGE gel.
Proteins were transferred to a PVDF membrane and blocked with 5% NFDM/TBST for 1 hour at room temperature. The primary antibody (HA723953) at 1/5,000 dilution was used in primary antibody dilution (K1803) at 4℃ overnight. Goat Anti-Rabbit IgG - HRP Secondary Antibody (HA1001) at 1/50,000 dilution was used for 1 hour at room temperature.
Western blot analysis of PIGR on different lysates with Rabbit anti-PIGR antibody (HA723953) at 1/5,000 dilution.
Lane 1: Mouse colon tissue lysate Lane 2: Rat stomach tissue lysate Lane 3: Rat colon tissue lysate
Lysates/proteins at 30 µg/Lane.
Predicted band size: 83 kDa Observed band size: 70-100 kDa
Exposure time: 42 seconds; ECL: K1802;
4-20% SDS-PAGE gel.
Proteins were transferred to a PVDF membrane and blocked with 5% NFDM/TBST for 1 hour at room temperature. The primary antibody (HA723953) at 1/5,000 dilution was used in primary antibody dilution (K1803) at 4℃ overnight. Goat Anti-Rabbit IgG - HRP Secondary Antibody (HA1001) at 1/50,000 dilution was used for 1 hour at room temperature.
PIGR was immunoprecipitated from 0.2 mg A431 cell lysate with HA723953 at 2 µg/10 µl beads. Western blot was performed from the immunoprecipitate using HA723953 at 1/5,000 dilution. HRP Conjugated Anti-Rabbit IgG for IP Nano-secondary antibody at 1/5,000 dilution was used for 1 hour at room temperature.
Lane 1: A431 cell lysate (input) Lane 2: HA723953 IP in A431 cell lysate Lane 3: Rabbit IgG instead of HA723953 in A431 cell lysate