• Purity

  >97%, by SDS-PAGE under reducing conditions and visualized by silver stain.

• Endotoxin Level

  <0.01 EU per 1 μg of the protein by the LAL method.  

• Activity

  Measured by its ability to inhibit Eotaxin-induced chemotaxis of BaF3 mouse pro‑B cells transfected with human CCR3. Nibbs, RJB.     et al. (2000) J. Immunol.     164:1488. The ED    ₅₀ for this effect is 1-5 µg/mL. Measured by its ability to chemoattract resting human T lymphocytes. The ED    ₅₀ for this effect is 0.5‑2 µg/mL.

• Source

  E. coli-derived Ala21-Ala89

• Accession #

• N-terminal Sequence    
  Analysis

  Ala21

• Predicted Molecular Mass

  7.8 kDa

Carrier Free

What does CF mean?

CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.

What formulation is right for me?

In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.

Background: CCL18/PARC

CCL18, also known as alternative macrophage activation-associated CC chemokine (AMAC)-1, macrophage inflammatory protein (MIP)-4, and dendritic cell chemokine (DC-CK1), is a novel CC chemokine that is highly homologous to MIP-1 alpha (61% amino acid (aa) sequence identity). CCL18 cDNA encodes an 89 aa residue precursor protein with a 20 aa putative signal peptide that is cleaved to generate a 69 aa residue mature protein which lacks potential glycosylation sites. In vitro, CCL18 mRNA expression is induced in alternatively activated macrophages by Th2 cytokines such as IL-4, IL-10 and IL-13, and inhibited by IFN‑ gamma. CCL18 mRNA is also expressed by GM‑CSF/IL‑4‑induced monocyte-derived dendritic cells. In vivo, CCL18 is highly expressed in lung and placenta but is not expressed in epidermal Langerhans cells. Recombinant CCL18 has been shown to chemoattract naive T cells, but not monocytes or neutrophils.

• References:

1. Adema, G. et al. (1997) Nature 387:713.

2. Kodelja, V. et al. (1998) J. Immunol. 160:141.

• Entrez Gene IDs:

  6362 (Human)

• Alternate Names:

  Alternative macrophage activation-associated CC chemokine 1; AMAC-1; AMAC1CC chemokine ligand 18; AMAC-1Small-inducible cytokine A18; CCL18; chemokine (C-C motif) ligand 18 (pulmonary and activation-regulated); CKb7; DC-CK1; DC-CK1CC chemokine PARC; DCCK1Macrophage inflammatory protein 4; Dendritic cell chemokine 1; MIP4; MIP-4; MIP-4C-C motif chemokine 18; PARC; PARCPulmonary and activation-regulated chemokine; SCYA18chemokine (C-C), dendritic; small inducible cytokine A18; small inducible cytokine subfamily A (Cys-Cys), member 18, pulmonary andactivation-regulated