Human S100B HEK293 Overexpression Lysate: Product Information
This Human S100B overexpression lysate was created in HEK293 Cells and intented for use as a Western blot (WB) positive control. Purification of S100B protein (Cat: 10181-H01H) from the overexpression lysate was verified.
A DNA sequence encoding the human S100B (NP_006263.1) (Ser 2-Glu 92) was expressed with the fused Fc region of human IgG1 at the N-terminus.
The recombinant human Fc/S100B is a disulfide-linked homodimeric protein. The reduced monomer consists of 328 amino acids and has a predicted molecular mass of 37.2 kDa. As a result of glycosylation, the apparent molecular mass of rhFc/S100B monomer is approximately 40 kDa in SDS-PAGE under reducing conditions.
Human S100B HEK293 Overexpression Lysate: Usage Guide
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.
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.
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.
Western Blot (WB) Optimal dilutions/concentrations should be determined by the end user.
Human S100B HEK293 Overexpression Lysate: Alternative Names
Human NEF Overexpression Lysate; Human S100 Overexpression Lysate; Human S100-B Overexpression Lysate; Human S100beta Overexpression Lysate
S100B Background Information
S1B is a member of the S1 family of proteins containing two EF-hand-type calcium-binding motifs. S1B exerts both intracellular and extracellular functions. Intracellular S1B acts as a stimulator of cell proliferation and migration and an inhibitor of apoptosis and differentiation, which might have important implications during brain, cartilage and skeletal muscle development and repair, activation of astrocytes in the course of brain damage and neurodegenerative processes, and of cardiomyocyte remodeling after infarction, as well as in melanomagenesis and gliomagenesis. As an extracellular factor, S1B engages RAGE (receptor for advanced glycation end products) in a variety of cell types with different outcomes (i.e. beneficial or detrimental, pro-proliferative or pro-differentiative) depending on the concentration attained by the protein, the cell type and the microenvironment. This calcium binding astrocyte-specific cytokine, presents a marker of astrocytic activation and reflects CNS injury. The excellent sensitivity of S1B has enabled it to confirm the existence of subtle brain injury in patients with mild head trauma, strokes, and after successful resuscitation from cardiopulmonary arrest. Recent findings provide evidence, that S1B may decrease neuronal injury and/or contribute to repair following traumatic brain injury (TBI). Hence, S1B, far from being a negative determinant of outcome, as suggested previously in the human TBI and ischemia literature, is of potential therapeutic value that could improve outcome in patients who sustain various forms of acute brain damage.
S100 calcium binding protein B
Kleindienst A, et al. (2006) A critical analysis of the role of the neurotrophic protein S100B in acute brain injury. J Neurotrauma. 23(8): 1185-200.
Bloomfield SM, et al. (2007) Reliability of S100B in predicting severity of central nervous system injury. Neurocrit Care. 6(2): 121-38.
Donato R, et al. (2009) S100B's double life: intracellular regulator and extracellular signal. Biochim Biophys Acta. 1793(6): 1008-22.
Beaudeux JL. (2009) S100B protein: a novel biomarker for the diagnosis of head injury. Ann Pharm Fr. Beaudeux JL. 67(3): 187-94.
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