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Evidence for a trans-acting activator function regulating the expression of the human CD5 antigen
Authors:Maria Teresa Scupoli  Silvia Sartoris  Morena Nicolis  Tiziana Cestari  Caterina Cambiaggi  Giuseppe Tridente  Roberto S Accolla
Institution:(1) Institute of Immunology and Infectious Diseases, Medical School, University of Verona, Policlinico Borgo Roma, 37134 Verona, Italy;(2) Present address: Istituto di Patologia, Università di Siena, Siena, Italy
Abstract:Interspecies somatic cell hybrids were generated by fusing the mouse T-lymphoma cell line, BW5147, with normal human T lymphocytes at different stages of differentiation. Thymocytes, activated peripheral T lymphocytes, or an activated T-cell clone were used as human partners, respectively, in three independent fusions. Irrespective of the human cell partner used for fusion, a certain number of hybrids lost CD5 surface expression over a period of time in culture. Analysis at the phenotype and genetic level showed that lack of CD5 expression was due neither to segregation of human autosome 11, on which the CD5 gene has been mapped, nor to deletion of the CD5 structural gene. Furthermore, loss of CD5 surface expression correlated with the absence of specific mRNA. Since these hybrids preferentially segregate human chromosomes, these results indicate the existence of a non-syntenic trans-active locus, or loci, positively controlling the expression of the human CD5 gene.
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