1887

Abstract

SUMMARY

A Marek’s disease lymphoblastoid cell line (MSB-1) has been analysed by immunoprecipitation for expression of tumour-associated antigen, Marek’s disease virus (MDV)-specific antigens and antigens specific to avian leukosis-sarcoma viruses. Rabbit antisera raised against two independently derived cell lines after extensive absorption with normal chick cells reacted with a polypeptide of mol. wt. 40000 (40K) in extracts of MSB-1 cells. The 40K polypeptide was not present in myeloblasts or in chick embryo fibroblasts (CEF) infected with MDV and did not react with antiserum raised against normal chicken thymus antigens. The possibility that the 40K polypeptide is a tumour-associated antigen is discussed. Seven MDV-specific antigens were noted in infected CEF (mol. wt. 110K, 100K, 80K, 70K, 50K, 35K and 32K) but none of these was detected in MSB-1 cells. The avian leukosis-sarcoma group-specific antigen P27 and its precursor Pr76 were not found in MSB-1 cells, confirming that expression of mature protein is not required for transformation by MDV. However, two polypeptides of unknown origin and function (mol. wt. 180K and 110K) were precipitated from MSB-1 cells with a rabbit anti-Rous sarcoma (Schmidt-Rupin, subgroup D) antiserum.

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/content/journal/jgv/10.1099/0022-1317-60-2-375
1982-06-01
2021-10-18
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