Home / IL-7 / Recombinant Human IL-7 Protein, CF

Recombinant Human IL-7 Protein, CF

Catalog #: BT-007
2 Citations Datasheet / COA / SDS
Analyzed by SEC-MALS
Catalog # Availability Size / Price Qty
BT-007-025
BT-007-100
BT-007-01M
BT-007-010
BT-007-250
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Recombinant Human IL‑7 Protein SEC-MALS.
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Product Details
Citations (2)
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Summary Product Datasheets Carrier Free Data Images Reconstitution Calculator Background Related Research Areas

Recombinant Human IL-7 Protein, CF Summary

Product Specifications

Purity
>97%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
Endotoxin Level
<0.10 EU per 1 μg of the protein by the LAL method.
Activity
Measured in a cell proliferation assay using PHA-activated human peripheral blood lymphocytes (PBL). Yokota, T. et al. (1986) Proc. Natl. Acad. Sci. USA 83:5894. The ED50 for this effect is 0.100-0.500 ng/mL.
Source
E. coli-derived human IL-7 protein
Asp26-His177, with an N-terminal Met
Accession #
P13232.1
N-terminal Sequence
Analysis
Met
Predicted Molecular Mass
17 kDa
SDS-PAGE
17 kDa, under reducing conditions.

Product Datasheets

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BT-007

Product Datasheet
COA
SDS

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.

BT-007

Formulation Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose.
Reconstitution Reconstitute at 100-500 μg/mL in PBS.
Shipping The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
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.

Scientific Data

SEC-MALS View Larger

Recombinant Human IL-7 Protein (Catalog # BT-007) has a molecular weight (MW) of 20.2 kDa as analyzed by SEC-MALS, suggesting that this protein is a monomer.

Bioactivity View Larger

Measured in a cell proliferation assay using PHA-activated human peripheral blood lymphocytes (PBL). The ED50 for this effect is 0.100‑0.500 ng/mL.

SDS-PAGE View Larger

2 μg/lane of Recombinant Human IL‑7 Protein (Catalog # BT-007) was resolved with SDS-PAGE under reducing (R) and non-reducing (NR) conditions and visualized by Coomassie® Blue staining, showing bands at 17 kDa.

Reconstitution Calculator

Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.

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Background: IL-7

IL-7 (interleukin-7) is a 25 kDa cytokine of the hemopoietin family that plays important roles in lymphocyte differentiation, proliferation, and survival (1-4). Human IL‑7 cDNA encodes 177 amino acids (aa) that include a 25 aa signal peptide (3). Human IL-7 shares approximately 60-63% aa sequence identity with mouse, rat, canine and feline IL-7, and 72-76% with equine, bovine, ovine, and porcine IL-7. Human and mouse IL-7 exhibit cross-species activity (2, 3). 

IL-7 is produced by a wide variety of cells in primary and secondary lymphoid tissues, including stromal epithelial cells of the thymus, bone marrow, and intestines (1, 2, 5). Circulating IL-7 is limiting in healthy animals, but increases during lymphopenia (1, 6). IL-7 signals through a complex of the IL-7 Receptor alpha subunit (IL-7 R alpha, also known as CD127) with the common gamma chain ( gamma c) (1). The gamma c is also a subunit of the receptors for IL-2, -4, -9, -15, and -21 (1). 

IL-7 R alpha is expressed on double negative (CD4-CD8-) and single positive (CD4+ or CD8+) naïve and memory T cells, but undergoes IL-7-mediated down‑regulation and shedding during antigen-driven T cell proliferation, and is absent on regulatory T cells (1, 2, 6-11). IL-7 contributes to the maintenance of all naïve and memory T cells, mainly by promoting expression of the anti-apoptotic protein Bcl-2 (9-11). It is required for optimal T cell-dendritic cell interaction (6). IL-7 is expressed early in B cell development prior to the appearance of surface IgM (1, 5, 9). In mouse, IL-7 activation of IL-7 R alpha is critical for both T cell and B cell lineage development, while in humans, it is required for T cell but not for B cell development (4, 9, 12, 13). However, IL-7 functions in both mouse and human pro-B cells to suppress premature Ig light chain recombination during proliferative growth (14, 15). 

Like other common gamma-chain cytokines like IL-2 and IL-15, IL-7 and its receptor, IL-7R, have been used in a variety of immunotherapy applications, often in fluid tumors and in some instances of solid tumor models (16). Sometimes use of recombinant IL-7 is preferential as current studies and early clinical trials of cancer have found less severe toxicity or side effects upon treatment with IL-7 in comparison to IL-15 or IL-2 (16). 

In CAR-T cell therapies, enhanced expression and secretion of human IL-7 and CCL19 have enhanced the ability of T cells to expand and migrate in vitro (17). Engineered CAR T cells expressing IL-7 or a constitutively active IL-7R results in increased efficacy of CAR T anti-tumor effects (16, 18). IL-7 is also frequently used in combination with IL-15 as a supplement in cell culture of CAR T cells to support their expansion (19). Additionally, IL-7/IL-15 in the presence of cord blood-derived T cells helps to maintain their early differentiation state (20). Monoclonal antibodies against IL-7R or small molecule inhibitors against the IL-7R signaling pathway are commonly used in circumstances of autoimmune diseases to delay disease progression (16).  Also due to its ability to stimulate both adaptive and innate immune cells, treatment with IL-7 has shown improved survival in patients with sepsis who are at risk of deadly secondary infections (21), providing evidence for IL-7 applications beyond cancer immunotherapy.

References
  1. Sasson, S.C. et al. (2006) Curr. Drug Targets 7:1571.
  2. Barata, J.T. et al. (2006) Exp. Hematol. 34:1133.
  3. Goodwin, R.G. et al. (1990) Proc. Natl. Acad. Sci. USA 86:302.
  4. Namen, A.E. et al. (1988) Nature 333:571.
  5. Shalapour, S. et al. (2012) PLoS ONE 7: e31939.
  6. Saini, M. et al. (2009) Blood 113:5793.
  7. Park, J.H. et al. (2004) Immunity 21:289.
  8. Vranjkovic, A. et al. (2007) Int. Immunol. 19:1329.
  9. Sudo, T. et al. (1993) Proc. Natl. Acad. Sci. 90:9125.
  10. Seddon, B. et al. (2003) Nat. Immunol. 4:680.
  11. Schluns, K.S. et al. (2000) Nat. Immunol. 5:426.
  12. Peschon, J.J. et al. (1994) J. Exp. Med. 180:1955.
  13. Pribyl, J.A. and T.W. LeBien (1996) Proc. Natl. Acad. Sci. 93:10348.
  14. Johnson, K. et al. (2012) J. Immunol. 188:6084.
  15. Nodland, S.E. et al. (2011) Blood 118:2116.
  16. Wang, C. et al. (2022) Int. J. Mol. Sci. 23:10370.
  17. Pang, N. et al. (2021) J Hematol Oncol. 14:118.
  18. Li, L. et al. (2022) Sci Rep. 12:12506.
  19. Xu, Y. et al. (2014) Blood. 123:3750.
  20. Marton, C. et al. (2022) Cancer Gene Ther. 29:961.
  21. Winer, H. et al. (2022) Cytokine. 160:156049.
Long Name
Interleukin 7
Entrez Gene IDs
3574 (Human); 16196 (Mouse); 25647 (Rat)
Alternate Names
IL7; IL-7; IL-7interleukin-7; interleukin 7; Lymphopoietin-1; PBGF

Citations for Recombinant Human IL-7 Protein, CF

R&D Systems personnel manually curate a database that contains references using R&D Systems products. The data collected includes not only links to publications in PubMed, but also provides information about sample types, species, and experimental conditions.

2 Citations: Showing 1 - 2
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  1. Transcription of HIV-1 at sites of intact latent provirus integration
    Authors: Teixeira, AR;Bittar, C;Silva Santos, GS;Oliveira, TY;Huang, AS;Linden, N;Ferreira, IATM;Murdza, T;Muecksch, F;Jones, RB;Caskey, M;Jankovic, M;Nussenzweig, MC;
    bioRxiv : the preprint server for biology
    Species: Human
    Sample Types: Whole Cells
    Applications: Bioassay
  2. Chemokine positioning determines mutually exclusive roles for their receptors in extravasation of pathogenic human T cells
    Authors: F Parween, SP Singh, HH Zhang, N Kathuria, FA Otaizo-Car, A Shamsaddin, PJ Gardina, S Ganesan, J Kabat, HA Lorenzi, TG Myers, JM Farber
    bioRxiv : the preprint server for biology, 2023-02-13;0(0):.
    Species: Human
    Sample Types: Whole Cells
    Applications: Bioassay

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