R-spondin 2 also known as roof plate-specific spondin-2 is a secreted protein that in humans that is encoded by the RSPO2 gene. R-spondin 2 synergizes with canonical WNT to activate beta-catenin. RSPO2 has been proposed to regulate craniofacial patterning and morphogenesis within pharyngeal arch 1 through ectoderm-mesenchyme signaling via the endothelin-Dlx5/6 pathway. In dogs, a variant on the Rspo2 gene is associated moustache and eyebrow thickness. In humans, recessive mutations in RSPO2 abrogate limb and lung development. Bruno Reversade and colleagues have reported in 2018 that loss of RSPO2 results in a syndrome of Tetra-amelia with lung agenesis.
Background References
1. Yue Z et al. RSPO2 and RANKL signal through LGR4 to regulate osteoclastic premetastatic niche formation and bone metastasis. J Clin Invest. 2022 Jan
2. Sun R et al. RSPO2 inhibits BMP signaling to promote self-renewal in acute myeloid leukemia. Cell Rep. 2021 Aug
Western blot analysis of RSPO2 on different lysates with Rabbit anti-RSPO2 antibody (HA500455) at 1/1,000 dilution.
Lane 1: 293 cell lysate (10 µg/Lane) Lane 2: Human lung tissue lysate (20 µg/Lane) Lane 3: Mouse brain tissue lysate (20 µg/Lane) Lane 4: Rat brain tissue lysate (20 µg/Lane)
Predicted band size: 28 kDa Observed band size: 28 kDa
Exposure time: 2 minutes;
12% 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 (HA500455) at 1/1,000 dilution was used in 5% NFDM/TBST at room temperature for 2 hours. Goat Anti-Rabbit IgG - HRP Secondary Antibody (HA1001) at 1:300,000 dilution was used for 1 hour at room temperature.
Immunohistochemical analysis of paraffin-embedded human kidney tissue with Rabbit anti-RSPO2 antibody (HA500455) at 1/1,000 dilution.
The section was pre-treated using heat mediated antigen retrieval with Tris-EDTA buffer (pH 9.0) for 20 minutes. The tissues were blocked in 1% BSA for 20 minutes at room temperature, washed with ddH2O and PBS, and then probed with the primary antibody (HA500455) at 1/1,000 dilution for 1 hour at room temperature. The detection was performed using an HRP conjugated compact polymer system. DAB was used as the chromogen. Tissues were counterstained with hematoxylin and mounted with DPX.
Immunohistochemical analysis of paraffin-embedded mouse small intestine tissue with Rabbit anti-RSPO2 antibody (HA500455) at 1/500 dilution.
The section was pre-treated using heat mediated antigen retrieval with Tris-EDTA buffer (pH 9.0) for 20 minutes. The tissues were blocked in 1% BSA for 20 minutes at room temperature, washed with ddH2O and PBS, and then probed with the primary antibody (HA500455) at 1/500 dilution for 1 hour at room temperature. The detection was performed using an HRP conjugated compact polymer system. DAB was used as the chromogen. Tissues were counterstained with hematoxylin and mounted with DPX.
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