CD137/4-1BB Protein, Canine (HEK293, His)

4-1BB (CD137; TNFRSF9), is a surface glycoprotein, a receptor of TNFSF9/4-1BBL, belongs to the tumor necrosis factor (TNF) receptor superfamily^[1]. 4-1BB is helpful for T cell activation and development, and also induces peripheral mononuclear cell proliferation and migration to the tumor microenvironment^[2]. 4-1BB is also involved in enhancing Nrf2 and NF-κB pathway mediated apoptosis of endothelial cells^[3]. CD137/4-1BB Protein, Canine (HEK293, His) has 185 amino acids (M1-S185), produced by HEK293 cells with C-terminal His-tag.

4-1BB, is encoded by TNFRSF9 (CD137, ILA), belongs to tumor necrosis factor (TNF) receptor superfamily. 4-1BB is a surface glycoprotein, expressed in a variety of cells, for example, T cells, B cells, natural killer (NK) cells, dendritic (DCs), eosinophils, and mast cells; even a variety of tumor cells such as human leukemia cells. It is widely spread in vascular smooth muscles, tumor vessel walls, and liver tissue of hepatocellular carcinoma. 4-1BB has a preference on CD8+ cells rather than CD4+ cells. It provides co-stimulatory signals and activates cytotoxic effects of CD8+ T cells and helps to form memory T cells. Finally, it promotes the immune system fighting against tumors. Moreover, CD137 binds CD137L to signal monocytes, increase their survival, proliferation and stimulate their migration and extravasation. In addition, it induces the release of various proinflammatory factors, leads to the influx of inflammatory monocytes into tissues and form an inflammatory environment^[1]. Specifically, CD137 promotes the migration of monocytes/macrophages to tumor microenvironment by upregulating the expression of Fra1. It also promoted the differentiation of monocytes/macrophages into osteoclasts at the same time, thus providing a favorable microenvironment for the colonization and growth of breast cancer cells in bone. It provides a promising therapeutic strategy for metastasis of breast cancer^[2]. Furthermore, CD137 signaling promotes endothelial cells (ECs) apoptosis through prooxidative and proinflammatory mechanisms, mediated by Nrf2 and NF-κB pathways, respectively^[3]. The homology of 4-1BB protein in human and mouse was low, and the sequence similarity was 56.75%.

Immobilized Canine CD137 at 10 µg/mL (100 µL/well) can bind Biotinylated Recombinant Rat TNFSF9. The ED₅₀ for this effect is 1.722 µg/mL.

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  Immobilized Canine CD137 at 10 µg/mL (100 µL/well) can bind Biotinylated Recombinant Rat TNFSF9. The ED₅₀ for this effect is 1.722 µg/mL.

Canine

HEK293

C-His

XP_850336.1 (I24-S185)

608274  [NCBI]

IQDSCSKCPAGTFCGKNKSQICIPCPPNSFSSTSGQKACDICRQCEGVFRTKKVCSPISNAECECISGFHCLGAGCTMCEQDCKQGQELTKQGCKDCRFGTFNDQKHGICQPWTNCSLDGKSVLVNGTKESDAVCGPASAGFSPGTASATTPAPARDPGHTS

Approximately 24-34 kDa

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  Greater than 95% as determined by reducing SDS-PAGE.

Lyophilized powder

Lyophilized from a 0.2 μm filtered solution of PBS, pH 7.4.

<1 EU/μg, determined by LAL method.

It is not recommended to reconstitute to a concentration less than 100 μg/mL in ddH₂O. For long term storage it is recommended to add a carrier protein (0.1% BSA, 5% HSA, 10% FBS or 5% Trehalose).

Stored at -20°C for 2 years. After reconstitution, it is stable at 4°C for 1 week or -20°C for longer (with carrier protein). It is recommended to freeze aliquots at -20°C or -80°C for extended storage.

Room temperature in continental US; may vary elsewhere.

• [1]. Ye L, et al. CD137, an attractive candidate for the immunotherapy of lung cancer. Cancer Sci. 2020 May;111(5):1461-1467.  [Content Brief]

  [2]. Jiang P, et al. CD137 promotes bone metastasis of breast cancer by enhancing the migration and osteoclast differentiation of monocytes/macrophages. Theranostics. 2019 May 9;9(10):2950-2966.  [Content Brief]

  [3]. Geng T, et al. CD137 Signaling Promotes Endothelial Apoptosis by Inhibiting Nrf2 Pathway, and Upregulating NF-κB Pathway. Mediators Inflamm. 2020 Jun 6;2020:4321912.  [Content Brief]