Trastuzumab is a humanized IgG1 monoclonal antibody that selectively binds to HER2 with high affinity. Trastuzumab can be used for the research of HER2-positive metastatic breast cancer and gastric cancer^[1][2][3]. (Note: The product specifications below only indicate the effective content of Trastuzumab. The component ratio of this product is Trastuzumab : excipients = 44 : 78.)

Human IgG1 kappa

Human IgG1 kappa, Isotype Control

Humanized

Treatment of HER2-overexpressing breast cancer cell lines with Trastuzumab results in induction of p27KIP1 and the Rb-related protein, p130, which in turn significantly reduces the number of cells undergoing S-phase. A number of other phenotypic changes are observed in vitro as a consequence of Trastuzumab binding to HER2-overexpressing cells. Interaction of Trastuzumab with the human immune system via its human immunoglobulin G1 Fc domain may potentiate its antitumor activities. in vitro studies demonstrate that Trastuzumab is very effective in mediating antibody-dependent cell-mediated cytotoxicity against HER2-overexpressing tumor targets^[1]. Trastuzumab consists of two antigen-specific sites that bind to the juxtamembrane portion of the extracellular domain of the HER2 receptor and that prevent the activation of its intracellular tyrosine kinase. Trastuzumab recruits immune effector cells that are responsible for antibody-dependent cytotoxicity^[2]. The presence of Trastuzumab IgG significantly increases killing of all breast cancer cell lines. The ADCC activity of PBMCs evoked by Trastuzumab is equally strong against Trastuzumab-sensitive (SKBR-3) or Trastuzumab-resistant (JIMT-1) breast cancer cells, with dose-dependent cell death reaching 50–60% killing at an effector/target ratio of 60:1^[3].

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

Trastuzumab treatment of mouse xenograft models results in marked suppression of tumor growth. When given in combination with standard cytotoxic chemotherapeutic agents, Trastuzumab treatment generally results in statistically superior antitumor efficacy compared with either agent given alone^[1]. Trastuzumab causes a significant growth inhibition of the outgrowth of macroscopic JIMT-1 xenograft tumors in both nude and SCID mice^[3].

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

145.36 kDa

180288-69-1

Solid

White to light yellow

[Trastuzumab]

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

• 
  Human IgG1 kappa

• 
  Loaded Trastuzumab on AHC2 biosensor, can bind Her2/CD340 Protein, Human (Biotinylated, HEK293, His, HY-P78882) with an affinity constant of 6.903E-10 M as determined in BLI assay.
• 
  Trastuzumab has a significant ADCC effect on BT474 cells in a dose-dependent manner.The EC₅₀ for this effect is 26.36 and 32.09 ng/mL.
• 
  Trastuzumab has a significant ADCC effect on SK-BR-3 cells in a dose-dependent manner.The EC₅₀ for this effect is 14.43 and 16.70 ng/mL.
• 
  Immobilized HER2/CD340 Protein, Human (630a.a, HEK293, His, HY-P70254) can bind Trastuzumab.The EC₅₀ for this effect is 2.16 ng/mL.

• [1]. Sliwkowski MX, et al. Nonclinical studies addressing the mechanism of action of trastuzumab. Semin Oncol. 1999 Aug;26(4 Suppl 12):60-70.  [Content Brief]

  [2]. Hudis CA, et al. Trastuzumab--mechanism of action and use in clinical practice. N Engl J Med. 2007 Jul 5;357(1):39-51.  [Content Brief]

  [3]. Barok M, et al. Trastuzumab causes antibody-dependent cellular cytotoxicity-mediated growth inhibition of submacroscopic JIMT-1 breast cancer xenografts despite intrinsic drug resistance. Mol Cancer Ther. 2007 Jul;6(7):2065-72.  [Content Brief]