The Ly-3 antigens on mouse thymocytes: immune precipitation and molecular weight characterization.
Open Access
- 1 August 1976
- journal article
- research article
- Published by Rockefeller University Press in The Journal of Experimental Medicine
- Vol. 144 (2), 476-493
- https://doi.org/10.1084/jem.144.2.476
Abstract
Specific anti-Ly sera were employed to precipitate Ly antigens from Nonidet P-40 extracts of mouse thymocytes labeled with 125I using lactoperoxidase and with NaB3H4 using galactose oxidase. Thymocytes from mice of the congenic strains C57BL/6J (Ly-2.2, Ly-3.2 positive), C57BL/6Ly-2a, Ly-3a (Ly-2.1, Ly-3.1 positive) and C57BL/6-Ly-2a (Ly-2.1, Ly-3.2-positive) were used as sources of labeled antigens and as immune adsorbants to permit evaluation of the specificity of each anti-Ly serum employed. Results of sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) under reducing conditions are consistent with the Ly-3.1 antigen containing a glycoprotein subunit with an apparent mol wt of 35,000 daltons. Specific precipitates obtained using anti-Ly-2.1 serum yielded SDS-PAGE profiles identical to that obtained with anti-Ly-3.1 serum, suggesting that the Ly-2 and Ly-3 antigens have the same molecular weight distribution. The relationships of these results to the observed close genetic and topological linkage of Ly-2 and Ly-3 and to the genetic linkage of these loci with the IB-peptide marker, a mouse Bk-region polymorphism, are discussed.Keywords
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