Direct binding of IL-12 to human and murine B lymphocytes.

Direct binding of IL-12 to human and murine B lymphocytes.
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IL-12 与人和鼠 B 淋巴细胞直接结合。

DOI:
10.1093/intimm/8.12.1955
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发表时间:
1996
影响因子:
4.4
通讯作者:
Metzger,DW
Metzger,DW
中科院分区:
医学3区
文献类型:
--
作者:
Vogel,LA;Showe,LC;Lester,TL;McNutt,RM;VanCleave,VH;Metzger,DW

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已显示IL-12通过直接活化T细胞和NK细胞在细胞介导的炎症反应中发挥核心作用。IL-12也强烈影响体液免疫,但这些作用被认为是间接的,由中介细胞因子引起。使用流式细胞术,我们现在表明IL-12直接与B细胞相互作用。新鲜分离的小鼠腹膜B-1和常规B淋巴细胞结合IL-12,但脾B细胞未能反应,除非首先用脂多糖刺激。通过PCR和RNA酶保护试验检测,发现所有小鼠B细胞来源均表达IL-12 R β1亚基转录物。在植物血凝素刺激的人T细胞母细胞和金黄色葡萄球菌/ IL-2刺激的B细胞母细胞上也检测到IL-12结合,但在新鲜分离的外周血淋巴细胞上未检测到。类似地,IL-12直接与人SKW 6.4伯基特B细胞淋巴瘤系结合。在所有情况下,通过从程序中省略IL-12消除阳性染色,表明其不是由于检测到内源性IL-12。这些发现表明,除了T和NK细胞之外,B细胞是IL-12的另一个主要靶标,并且IL-12可以直接影响体液免疫。
IL-12 has been shown to play a central role in cell-mediated inflammatory reactions through direct activation of T cells and NK cells. IL-12 also strongly influences humoral immunity but these effects have been thought to be indirect and caused by intermediary cytokines. Using flow cytometry, we now show that IL-12 directly interacts with B cells. Freshly isolated murine peritoneal B-1 and conventional B lymphocytes bound IL-12, but splenic B cells failed to react unless first stimulated with lipopolysaccharide. All murine B cell sources were found to express IL-12R β1 subunit transcripts as detected by PCR and RNase protection assays. IL-12 binding was also detected on phytohemagglutinin-stimulated human T cell blasts andStaphylococcus aureus/ IL-2-stimulated B cell blasts but not on freshly isolated peripheral blood lymphocytes. Similarly, IL-12 directly bound to the human SKW6.4 Burkitt's B cell lymphoma line. In all cases positive staining was ablated by omitting IL-12 from the procedure, showing that it was not due to detection of endogenous IL-12. These findings indicate that B cells represent another major target for IL-12 in addition to T and NK cells, and that IL-12 can directly affect humoral immunity.
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