Description
CXCL12, also known as SDF-1, is a small (8 kDa) cytokine highly conserved chemotactic cytokine belonging to the large family of CXC chemokines. SDF-1 alpha and SDF-1 beta are the first cytokines initially identified using the signal sequence trap cloning strategy from a mouse bone-marrow stromal cell line. They are identical except for the four residues present in the C-terminus of SDF1β but absent from SDF1α. CXCL12 binds primarily to CXC receptor 4. The binding of CXCL12 to CXCR4 induces intracellular signaling through several divergent pathways initiating signals related to chemotaxis, cell survival and/or proliferation, increase in intracellular calcium, and gene transcription. The CXCL12/CXCR4 axis is involved in tumor progression, angiogenesis, metastasis, and survival. CXCL12 also can influence lymphopoiesis and regulate patterning and cell number of neural progenitor.
Product Properties
| Synonyms |
SDF-1 alpha, hSDF-1 alpha, IRH, hIRH, PBSF
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Accession
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Source
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E.coli-derived Human SDF-1α/CXCL12α, Lys22-Lys89
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Molecular Weight
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KPVSLSYRCP CRFFESHVAR ANVKHLKILN TPNCALQIVA RLKNNNRQVC IDPKLKWIQE
YLEKALNK
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Tag
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Sterile Filtered White lyophilized (freeze-dried) powder.
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| Purity |
> 97 % by SDS-PAGE and HPLC analyses.
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Biological Activity
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The biological activity determined by a chemotaxis bioassay using PHA and rHuIL-2 activated human peripheral blood T-lymphocytes is in a concentration range of 20-80 ng/mL. Fully biologically active when
compared to standard.
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Endotoxin
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Less than 1.0 EU/μg of the protein as determined by LAL method.
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Formulation
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Lyophilized from a 0.2 μm filtered concentrated solution in 20 mM PB pH 7.0, 130 mM NaCl.
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We recommend that this vial be briefly centrifuged prior to opening to bring the contents to the bottom.Reconstitute in sterile distilled water or aqueous buffer containing 0.1 % BSA to a concentration of 0.1-1.0 mg/mL. Stock solutions should be apportioned into working aliquots and stored at ≤ -20°C.
Further dilutions should be made in appropriate buffered solutions.
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Storage
The products are shipped with ice pack and can be stored at -20 ℃ for 1 year.
1 month, 2 to 8 °C under sterile conditions after reconstitution.
3 months, -20 °C under sterile conditions after reconstitution.
Recommend to aliquot the protein into smaller quantities when first used and avoid repeated freeze-thaw cycles.
Caution
1. Avoid repeated freeze-thaw cycles.
2. For your safety and health, please wear lab coats and disposable gloves for operation.
3. For research use only.
