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Department of Experimental Pathology, Section of Microbiology and Virology, University of Bologna, via San Giacoma 12, 40126 Bologna, Italy
Hyperimmune rabbit and mouse sera raised to human herpesvirus 7 (HHV-7)-infected cells and an immune human serum identified 20 [35S]methionine-[35S]cysteinelabelled proteins specific for HHV-7-infected cord blood mononuclear cells, ranging in apparent Mr from 136K to 30K. The major proteins had apparent Mr values of 121K, 100K, 87K, 85K, 60K, 51K, 46K, 42K, 40K and 36K. The human serum also identified seven [3H]glycosamine-labelled glycoproteins, with apparent Mr values of 100K, 89K, 82K, 67K, 63K, 53K and 41K. Four monoclonal antibodies (MAbs) specific for HHV-7-infected cells were derived. Two reacted with a family of five antigenically related polypeptides (87K, 85K, 70K, 61K and 57K in apparent Mr), designated as the p85 complex. Two reacted with 121K and 51K Mr proteins designated as p121 and p51, respectively. Human sera react with high frequency with the p85 complex and to a lesser extent with p121; hence these two proteins appear to be immunodominant for both humans and laboratory animals. The hyperimmune mouse serum and some of the MAbs showed some cross-reactivity with HHV-6A(U1102)- and 6B(Z29)-infected cells. The implications of cross-reactivity with respect to the human immune response to HHV-6 and -7 infections and prevalence analyses are discussed.
On leave of absence from The People's Republic of China, Shandong University.
Received 24 February 1994;
accepted 10 May 1994.
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