Patritumab  (Synonyms: AMG-888; U3-1287)

Patritumab (Human Anti-ERBB3 Recombinant Antibody) is a neutralizing monoclonal antibody to ERBB3. Patritumab shows a synergy with Cetuximab (HY-P9905), potently inhibits the phosphorylation of EGFR, HER2, HER3, ERK, and AKT. Patritumab also induces cell apoptosis and suppresses the growth of pancreatic, non-small cell lung cancer, and colorectal cancer xenograft tumors^[1].

Human IgG1(K214R) kappa

Human IgG1 (K214R) kappa, Isotype Control

Human

ERBB3/HER3

Patritumab targets to the extracellular domain (ECD) of HER3 and (10 μg/mL; 5 d) induces DiFi-HRG4 cells apoptosis^[1].
Patritumab (10 μg/mL; 6 h) markedly inhibits the phosphorylation of HER3 and AKT, without affecting that of ERK, in DiFi-HRG4 cells^[1].
Patritumab (10 μg/mL; 48 h) also induces the cleavage of PARP accompanied with both up-regulation of BIM and down-regulation of survivin expression^[1].

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

Patritumab (1 mg/mouse; i.p.; twice a week for 4 weeks) combines with 1 mg Cetuximab and restores Cetuximab sensitivity in DiFi-HRG tumor xenografts model in mice^[1].
Heregulin produced by colorectal cancer tumors harboring wild-type KRAS induces Cetuximab resistance, and that combination therapy with cetuximab and patritumab overcomes such resistance in vivo^[1].

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

2065  [NCBI]

P21860

ELISA, FACS, Functional assay

Unconjugated

The product can be reconstituted/diluted with sterile PBS or saline.

146.86 kDa

1262787-83-6

Liquid

Colorless to light yellow

[Patritumab]

Shipping with dry ice.

Please refer to the lot-specific COA for specific buffer information.

Please store the product under the recommended conditions in the Certificate of Analysis.

• 
  Human IgG1 kappa

• 
  Flow cytometric analysis of 1×10⁶ MCF-7 cells labelling HER3 (red) with Patritumab (HY-P99275). Cells were fixed with 4% paraformaldehyde and permeabilised with 90% methanol. Then stained with the primary antibody at 1/200 dilution for an hour at 4℃. Alexa Goat Anti-Human IgG H&L (AF488) (HY-P83776) was used as the secondary antibody at 1/1,000 dilution for 30 minutes at 4℃. Human IgG1(K214R) kappa Isotype Control (HY-P99995, blue) was used as the isotype control.
• 
  Immobilized Human HER3/ERBB3 Protein (ECD, His Tag) can bind Patritumab. The EC₅₀ for this effect is 1.41 ng/mL.
• 
  Loaded Patritumab on AHC2 biosensor, can bind HER3 Protein, Human (HEK293, His, HY-P72625) with an affinity constant of 1.804E-09 M as determined in BLI assay.

• [1]. Kawakami H, et al. The anti-HER3 antibody patritumab abrogates cetuximab resistance mediated by heregulin in colorectal cancer cells. Oncotarget. 2014 Dec 15;5(23):11847-56.  [Content Brief]