[No authors listed]
CD14 is a membrane-associated glycosylphosphatidylinositol (GPI)-anchored protein that binds lipopolysaccharide (LPS) of Gram-negative bacteria and enables LPS-dependent responses in a variety of cells. In this study a cDNA containing the porcine CD14 coding sequence has been cloned and its complete sequence determined. The amino acid sequence deduced from pig CD14 cDNA encodes a 373 amino acid polypeptide that exhibits 75%, 72%, 69%, 66%, 57% and 56% similarity to CD14 from cow, horse, human, rabbit, mouse and rat, respectively. Structural analysis showed that the porcine CD14 is a membrane glycoprotein with a GPI-anchor site and an extracellular domain containing 11 leucine-rich repeats. In addition, the LPS-binding regions identified in the human CD14 are highly conserved in the N-terminal domain of the porcine sequence. Fluorescence in situ hybridization was used to locate the CD14 gene on the pig chromosome 2, band q28. Expression analysis revealed that porcine CD14 transcripts were detected in all tissues and cells examined, suggesting that the expression of porcine CD14 gene is not restricted to myeloid cell lineage. Finally, we report that LPS stimulation significantly up-regulated CD14 gene expression in porcine alveolar macrophages.
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