1. Clone and expression of mutant M-CSF and its receptor from human leukemic cell line J6-1
- Author
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Li, Ge, Song, Yu-Hua, Wu, Ke-Fu, Lin, Yong-Min, Cao, Zhen-Yu, and Zheng, Guo-Guang
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GENE expression , *HEMATOPOIESIS , *LEUKEMIA - Abstract
Macrophage colony-stimulating factor (M-CSF) plays important roles in hematopoietic and immunologic systems. Some isoforms or mutations have been demonstrated including membrane-bound and cellular M-CSF, which associated with some leukemia, lymphoma and other solid tumors. We previously reported that the M-CSF-like membrane-associated factor (MAF-J6-1) and its receptor was found from human leukemic cell line J6-1. In this report, the cDNA of MAF-J6-1 and its receptor were cloned. The cDNA sequence of MAF-J6-1 shows a 768 bp open reading frame (ORF) with 99.2% homology to m-M-CSF, but six site mutations, including two synonymous mutations and four missense mutations. The cDNA of MAF-J6-1-R has a 2916 bp ORF shared 99.6% homology with M-CSF-R, but 13 site mutations, including six synonymous mutations and seven missense mutations. At the same time, a 1662 bp mutant s-M-CSF cDNA, which has 10 site mutations including three synonymous mutations and seven missense mutations, was cloned from J6-1 cells. The cDNAs of MAF-J6-1 and MAF-J6-1-R were inserted into a mammalian expression plasmid pTARGET and were expressed in COS-7 cells that demonstrated by their specific MAb. COS-7 cells transfected with MAF-J6-1-R show obvious protein tyrosine kinase (PTK) activity. Our present work shows that MAF-J6-1 and its receptor are mutations of M-CSF and its receptor. [Copyright &y& Elsevier]
- Published
- 2002
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