Rat ESAM HEK293 Overexpression Lysate

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Rat ESAM HEK293 Overexpression Lysate: Product Information

Product Description
This Rat ESAM overexpression lysate was created in HEK293 Cells and intented for use as a Western blot (WB) positive control. Purification of ESAM protein (Cat: 80241-R02H) from the overexpression lysate was verified.
Expression Host
HEK293 Cells
Species
Rat
Sequence Information
A DNA sequence encoding the rat ESAM (Q6AYD4) extracellular domain (Met 1-Ala 251) was fused with the Fc region of human IgG1 at the C-terminus.
Molecule Mass
The recombinant rat ESAM/Fc is a disulfide-linked homodimer. The reduced monomer comprises 463 amino acids and predicts a molecular mass of 51.2 kDa. The apparent molecular mass of the rat ESAM/Fc monomer is approximately 55-60 kDa in SDS-PAGE under reducing conditions.

Rat ESAM HEK293 Overexpression Lysate: Usage Guide

Preparation Method
Cell lysate was prepared by homogenization of the over-expressed cells in ice-cold modified RIPA Lysis Buffer with cocktail of protease inhibitors (Sigma). Cell debris was removed by centrifugation. Protein concentration was determined by Bradford assay (Bio-Rad protein assay, Microplate Standard assay). The cell lysate was boiled for 5 min in 1 x SDS loading buffer (50 mM Tris-HCl pH 6.8, 12.5% glycerol, 1% sodium dodecylsulfate, 0.01% bromophenol blue) containing 5% b-mercaptoethanol, and lyophilized.
Lysis Buffer
Modified RIPA Lysis Buffer: 50 mM Tris-HCl pH 7.4, 150 mM NaCl, 1mM EDTA, 1% Triton X-100, 0.1% SDS, 1% Sodium deoxycholate, 1mM PMSF.
Recommend Usage
1.  Centrifuge the tube for a few seconds and ensure the pellet at the bottom of the tube. 2.  Re-dissolve the pellet using 200μL pure water and boil for 2-5 min.
Sample Buffer
1 X Sample Buffer (1 X modified RIPA buffer+1 X SDS loading buffer).
Stability & Storage
Store at 4℃ for up to twelve months from date of receipt. After re-dissolution, aliquot and store at -80℃ for up to twelve months. Avoid repeated freeze-thaw cycles.
Application
Western Blot (WB)
Optimal dilutions/concentrations should be determined by the end user.

ESAM Background Information

Endothelial cell-selective adhesion molecule (ESAM) is a member of JAM family of immunoglobulin superfamily and consists of one V-type and one C2-type immunoglobulin domain, as well as a hydrophobic signal sequence, a single transmembrane region, and a cytoplasmic domain. It is specifically expressed at endothelial tight junctions and on activated platelets. ESAM at endothelial tight junctions participates in the migration of neutrophils through the vessel wall, possibly by influencing endothelial cell contacts. The adaptor protein membrane-associated guanylate kinase MAGI-1 has been identified as an intracellular binding partner of ESAM. Previous studies have indicated that ESAM regulates angiogenesis in the primary tumor growth and endothelial permeability. It suggest that ESAM has a redundant functional role in physiological angiogenesis but serves a unique and essential role in pathological angiogenic processes such as tumor growth.
Full Name
endothelial cell adhesion molecule
References
  • Ishida T, et al. (2003) Targeted disruption of endothelial cell-selective adhesion molecule inhibits angiogenic processes in vitro and in vivo. J Biol Chem. 278(36): 34598-604.
  • Wegmann F, et al. (2004) Endothelial adhesion molecule ESAM binds directly to the multidomain adaptor MAGI-1 and recruits it to cell contacts. Exp Cell Res. 300(1): 121-33.
  • Wegmann F, et al. (2006) ESAM supports neutrophil extravasation, activation of Rho, and VEGF-induced vascular permeability. J Exp Med. 203(7): 1671-7.
  • Hara T, et al. (2009) Endothelial cell-selective adhesion molecule regulates albuminuria in diabetic nephropathy. Microvasc Res. 77(3): 348-55.
  • Cangara HM, et al. (2010) Role of endothelial cell-selective adhesion molecule in hematogeneous metastasis. Microvasc Res. 80(1): 133-41.
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