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pubmed-article:8482840pubmed:abstractTextSeveral new rat class III Fc gamma R isoforms are described here, extending the genetic complexity of this receptor family and further distinguishing rat CD16 from mouse CD16, represented by only one receptor isoform, and human CD16, represented by only two isoforms. RNase protection assays reveal that three rat tumor cell lines--RBL-1 basophilic leukemia cells, RM-SV1 macrophages, and CRNK-16 NK cells--all coordinately express multiple and probably identical rtFc gamma RIII-related transcripts in similar relative proportions but at significantly different levels. These results indicate that no single isoform predominates in these cell types but that the overall level of rtFc gamma RIII-related transcripts is differentially regulated. Two of the rtFc gamma RIII isoforms found to have extensive amino acid sequence differences in their second extracellular (EC2) domains are shown to bind rat and mouse IgG subclasses differently. This result suggests that the receptor isoform diversity in this species may function as a mechanism for extending the IgG-binding capacity of rat leukocytes. Cloned cDNA for the rat CD3 zeta protein was also isolated in this study and its ability to augment surface expression of class III Fc gamma R was tested by rosetting of cDNA-transfected COS cells. Like the structurally homologous mouse CD3 zeta, rat CD3 zeta fails to promote surface expression of Fc gamma RIII, sharply contrasting the efficient receptor expression produced by human CD3 zeta. Variations in the transmembrane amino acid sequences correlate with the divergent capacities of these CD3 zeta molecules to augment receptor expression. The high levels of CD3 zeta message expressed in rat NK cells may indicate that other unidentified hetero-subunits are required for assembly of rat CD3 zeta into functional CD16 receptors.lld:pubmed
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pubmed-article:8482840pubmed:articleTitleRat class III Fc gamma receptor isoforms differ in IgG subclass-binding specificity and fail to associate productively with rat CD3 zeta.lld:pubmed
pubmed-article:8482840pubmed:affiliationDepartment of Biological Sciences, University of California, Santa Barbara 93106.lld:pubmed
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