CD9, a major platelet cell surface glycoprotein, is a ROCA antigen and is expressed in the nervous system

CD9, a major platelet cell surface glycoprotein, is a ROCA antigen and is expressed in the nervous system
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CD9 是一种主要的血小板细胞表面糖蛋白,是一种 ROCA 抗原,在神经系统中表达

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发表时间:
1995
影响因子:
5.3
通讯作者:
Paul H. Patterson
Paul H. Patterson
中科院分区:
医学1区
文献类型:
--
作者:
Z. Kaprielian;Kyung;Michael Hadjiargyrou;Paul H. Patterson

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我们之前产生了一种单抗,ROCA1,它优先与吻侧交感神经节和肋间神经结合。另外两个单抗,ROCA2和B2C11,与相同的结构结合,但不以吻尾梯度结合。这三种单抗都识别一个26 kDa的细胞表面蛋白。从亲和纯化的26 kDa蛋白中获得的氨基酸序列数据表明,与人CD9有一定的同源性,CD9是一种与造血细胞内细胞间信号转导有关的四聚蛋白。利用该方法,我们从大鼠坐骨神经和交感神经节中获得了代表大鼠CD9全长编码序列的cDNA克隆。ROCA1、ROCA2和B2C11分别从稳定转染其中一个克隆的CHO细胞中免疫沉淀出26 kDa的蛋白,证明ROCA细胞表面抗原确实是大鼠CD9。我们发现CD9mRNA广泛表达,尤其是在许多神经组织中表达水平很高。原位杂交显示外周神经元、雪旺细胞以及肾上腺嗜铬细胞表达CD9mRNA。与免疫印迹分析显示,与ROCA1表位不同,26 kDa蛋白不在吻尾梯度中表达,我们在大鼠吻侧和尾侧肋间神经中发现了相似水平的CD9 mRNA。在生后发育的大鼠坐骨神经发育过程中,CD9基因的表达与髓鞘基因的表达是协调调节的。这些结果提供了另一个由造血细胞和神经细胞表达的细胞表面蛋白的例子,并表明CD9在神经系统的细胞间信号转导中发挥作用。
We previously generated a monoclonal antibody (mAb), ROCA1, which binds preferentially to rostral versus caudal sympathetic ganglia and intercostal nerves. Two other mAbs, ROCA2 and B2C11, bind to the same structures but not in rostrocaudal gradients. All three mAbs recognize a 26 kDa cell surface protein. Amino acid sequence data obtained from the affinity purified 26 kDa protein showed some homology with human CD9, a tetraspan protein implicated in intercellular signaling in hematopoietic cells. Using the PCR, we obtained cDNA clones representing the entire rat CD9 coding sequence from sciatic nerve and sympathetic ganglia. ROCA1, ROCA2, and B2C11 each immunoprecipitate a 26 kDa protein from CHO cells stably transfected with one of the clones, demonstrating that the ROCA cell surface antigen is indeed rat CD9. We find that CD9 mRNA is widely expressed, with particularly high levels present in a number of neural tissues. In situ hybridization demonstrates that peripheral neurons and Schwann cells, as well as adrenal chromaffin cells express CD9 mRNA. Consistent with immunoblot analyses showing that, unlike the ROCA1 epitope, the 26 kDa protein is not expressed in a rostrocaudal gradient, we find similar levels of rat CD9 mRNA in rostral and caudal intercostal nerves. In developing postnatal rat sciatic nerve, CD9 mRNA levels are coordinately regulated with the expression of myelin genes. These results provide another example of a cell surface protein expressed by both hematopoietic and neural cells, and suggest a role for CD9 in intercellular signaling in the nervous system.
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