IL-12 beta 蛋白, Human (HEK293, Fc)

IL-12 beta Protein, also known as natural killer cell stimulatory factor 2, is a common subunit (p40) of IL-12 and IL-23. IL-12 is a inflammatory factor expressed by activated macrophages, and involves in Th1-type immune response against cancer^[1]. IL-12 beta Protein located outside the cell membrane, involves in singalling mediated by Jak-STAT^[3]. IL-12 beta Protein consists of 328 amino acids (M1-S328) with a fibronectin type-III domain (237-328 a.a). IL-12 beta Protein, Human (M1-S328) is produced in HEK293 cells with a C-Terminal Fc-tag.

IL-12β蛋白，又称IL12 p40亚基或IL-12B，与IL-12 p35亚基（IL-12A）异二聚化形成IL-12，与IL23 p19亚基异二聚化形成IL-23，发挥不同的调节作用功能^[1]。
IL-12 和 IL23 属于 IL-12 家族，参与促炎反应，由活化的巨噬细胞表达，是 Th1 细胞发育的重要诱导剂^[2]。
IL-12 信号通过 p-STAT4 介导的 IL-12Rβ1 和 IL-12Rβ2 传递，而 IL-23 信号通过 p-STAT1 介导的 IL-12Rβ1 和 IL-23R 传递p-STAT3^[3]。
人IL-12β蛋白的氨基酸序列与小鼠（69.04%）和大鼠（69.04%）有很大差异。
白细胞介素 12 (IL-12) 家族已知是一种炎症因子，可诱导自身免疫性炎症，因此可能是自身免疫性炎症性疾病的原因，并且可能对肿瘤发生具有重要作用^[4]。

Recombinant human (rh)IL-12 results in memory-like NK cell differentiation and enhanced responses against cancer^[5].
The combination of IL-12 (3 ng/mL) and IL-15 (1 ng/mL) induce IFN-γ secretion in natural killer (NK) cells^[6].

Measured by its binding ability in a functional ELISA. Immobilized IL‑12 R beta 1 at 2 μg/mL (100 μL/well) can bind biotinylated IL‑12 beta.The ED₅₀ for this effect is 0.9162 μg/mL.

Human

HEK293

C-hFc

P29460/NP_002178.2 (I23-S328)

3593  [NCBI]

IWELKKDVYVVELDWYPDAPGEMVVLTCDTPEEDGITWTLDQSSEVLGSGKTLTIQVKEFGDAGQYTCHKGGEVLSHSLLLLHKKEDGIWSTDILKDQKEPKNKTFLRCEAKNYSGRFTCWWLTTISTDLTFSVKSSRGSSDPQGVTCGAATLSAERVRGDNKEYEYSVECQEDSACPAAEESLPIEVMVDAVHKLKYENYTSSFFIRDIIKPDPPKNLQLKPLKNSRQVEVSWEYPDTWSTPHSYFSLTFCVQVQGKSKREKKDRVFTDKTSATVICRKNASISVRAQDRYYSSSWSEWASVPCS

Approximately 61.4 kDa

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

无菌粉末

Lyophilized from a 0.2 μm filtered solution of 20 mM PB, 150 mM NaCl, 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]. Lu X. Impact of IL-12 in Cancer. Curr Cancer Drug Targets. 2017;17(8):682-697.  [Content Brief]

  [2]. Gunsten S, et al. IL-12 p80-dependent macrophage recruitment primes the host for increased survival following a lethal respiratory viral infection. Immunology. 2009 Apr;126(4):500-13.  [Content Brief]

  [3]. Gotthardt D, Trifinopoulos J, Sexl V, Putz EM. JAK/STAT Cytokine Signaling at the Crossroad of NK Cell Development and Maturation. Front Immunol. 2019 Nov 12;10:2590.  [Content Brief]

  [4]. Tait Wojno ED, Hunter CA, Stumhofer JS. The Immunobiology of the Interleukin-12 Family: Room for Discovery. Immunity. 2019 Apr 16;50(4):851-870.  [Content Brief]

  [5]. Becker-Hapak MK, et al. A Fusion Protein Complex that Combines IL-12, IL-15, and IL-18 Signaling to Induce Memory-Like NK Cells for Cancer Immunotherapy. Cancer Immunol Res. 2021 Sep;9(9):1071-1087.  [Content Brief]

  [6]. Krämer B, et al. Do lambda-IFNs IL28A and IL28B act on human natural killer cells? Proc Natl Acad Sci U S A. 2011 Aug 23;108(34):E519-20; author reply E521-2.  [Content Brief]