名称：重组大鼠MDC/CCL22

Synonyms：STCP-1, MDC (1-69), Macrophage-derived Chemokine

Source：Escherichia coli.

Molecular Weight：Approximately 7.9 kDa, a single, non-glycosylated polypeptide chain containing 68 amino acids.

Quantity：5μg/20μg/1000μg

AA Sequence：GPYGANVEDS ICCQDYIRHP LPPRFVKEFY WTSKSCRKPG VVLITIKNRD ICADPRMLWV KKILHKLA

Purity：> 96 % by SDS-PAGE and HPLC analyses.

Biological Activity：Fully biologically active when compared to standard. The biologically active determined by a chemotaxis bioassay using human T-lymphocytes is in a concentration range of 10-100 ng/ml.

Physical Appearance：Sterile Filtered White lyophilized (freeze-dried) powder.

Formulation：Lyophilized from a 0.2 μm filtered concentrated solution in 2 × PBS, pH7.4.

Endotoxin：Less than 1 EU/μg of rRtMDC/CCL22 as determined by LAL method.

Reconstitution：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.

Stability & Storage：Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
- 12 months from date of receipt, -20 to -70 °C as supplied.
- 1 month, 2 to 8 °C under sterile conditions after reconstitution.
- 3 months, -20 to -70 °C under sterile conditions after reconstitution.

Reference：1. Nomiyama H, Imai T, Kusuda J, et al. 1998. Cytogenet Cell Genet, 81: 10-1.
2. Godiska R, Chantry D, Raport CJ, et al. 1997. J Exp Med, 185: 1595-604.
3. Yamashita UandKuroda E. 2002. Crit Rev Immunol, 22: 105-14.
4. Katou F, Ohtani H, Nakayama T, et al. 2001. Am J Pathol, 158: 1263-70.

Background：CCL22 is a protein encoded by the CCL22 gene. It is highly expressed in macrophage, monocyte-derived dendritic cell and thymus, additionally, also detected in the tissues of thymus, lymph node and appendix. CCL22 can bind to CCR4, and is a chemoattractant for monocytes, monocyte-derived dendritic cells, and natural killer cells, but not for neutrophils, eosinophils, and resting T-lymphocytes. After secreted from monocyte-derived dendritic cells, the protein can be proteolytic cleaved into three forms: MDC (3-69), MDC (5-69), MDC (7-69).

SDS-PAGE：