MXD3 is a member of the MXD family of basic-helix-loop-helix transcription factors that form heterodimers with the cofactor MAX, and were originally proposed as functional antagonists of MYC proteins in the MYC/MAX/MAD transcriptional network. While some MXD proteins are MYC antagonists by acting as transcriptional repressors to promote cell differentiation, MXD3 is an atypical member that plays a role in proliferation rather than differentiation. MXD3 promotes granule neuron precursor (GNP) proliferation through a Sonic Hedgehog-mediated pathway, it is expressed in a mouse model of medulloblastoma, and its knock-down (KD) reduced proliferation of the human medulloblastoma cell line DAOY.
Background References
1. Barisone GA et al. Loss of MXD3 induces apoptosis of Reh human precursor B acute lymphoblastic leukemia cells. Blood Cells Mol Dis 54(4):329-335 (2015).
Proteins were transferred to a PVDF membrane and blocked with 5% NFDM/TBST for 1 hour at room temperature. The primary antibody (ET7109-76) 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 MXD3 / MAD3 on different lysates with Rabbit anti-MXD3 / MAD3 antibody (ET7109-76) at 1/2,000 dilution.
Lane 1: Neuro-2a cell lysate Lane 2: C6 cell lysate Lane 3: Mouse testis tissue lysate Lane 4: Rat testis tissue lysate
Lysates/proteins at 20 µg/Lane.
Predicted band size: 23 kDa Observed band size: 27 kDa
Proteins were transferred to a PVDF membrane and blocked with 5% NFDM/TBST for 1 hour at room temperature. The primary antibody (ET7109-76) at 1/2,000 dilution was used in 5% NFDM/TBST at 4℃ overnight. Goat Anti-Rabbit IgG - HRP Secondary Antibody (HA1001) at 1/50,000 dilution was used for 1 hour at room temperature.
Immunohistochemical analysis of paraffin-embedded human testis tissue with Rabbit anti-MXD3 / MAD3 antibody (ET7109-76) 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 (ET7109-76) 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.
MXD3 / MAD3 was immunoprecipitated from 0.2 mg SK-OV-3 cell lysate with ET7109-76 at 2 µg/10 µl beads. Western blot was performed from the immunoprecipitate using ET7109-76 at 1/2,000 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: SK-OV-3 cell lysate (input) Lane 2: ET7109-76 IP in SK-OV-3 cell lysate Lane 3: Rabbit IgG instead of ET7109-76 in SK-OV-3 cell lysate