Abstract
To examine the phenotypic alterations associated with human T-lymphotropic virus types I and II (HTLV-I and -II) infection, long-term cell lines (n = 12 HTLV-I cell lines; n = 11 HTLV-II cell lines; n = 6 virus-negative cell lines) were analyzed for the cell surface expression of various lineage markers (i.e., myeloid, progenitor, and leukocyte), integrin receptors, and receptor-counterreceptor (R-CR) pairs responsible for cellular activation. As expected, all cell lines expressed the markers characterizing the leukocyte lineage (CD43, CD44, and CD53). Of the progenitor-myeloid markers examined (CD9, CD13, CD33, CD34, and CD63), only the percent expression of CD9 was significantly increased on HTLV-I and -II-infected cell lines as compared with that on virus-negative cell lines. Analysis of the beta 1 integrin subfamily (CD29, CD49b, CD49d, CD49e, and CD49f) showed no significant change, except that CD49e was significantly decreased on the HTLV-infected cell lines. For the beta 2 integrin subfamily, the cell surface density was increased for CD18 and CD11a, while the CD11c molecule was expressed exclusively on the HTLV-I- and HTLV-II-infected cell lines. Analysis of several R-CR pairs (CD2-CD58, CD45RO-CD22, CD5-CD72, CD11a-CD5...Continue Reading
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