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Experiments were performed to determine if sera, monocytes, or non\u2010T cells from patients with CLL suppress the proliferative response and synthesis of immunoglobulin (Ig) following incubation with pokeweed mitogen (PWM) in cocultures with lymphocytes from normal individuals. The data indicate that sera and monocytes from patients with CLL did not suppress the proliferative response or synthesis of Ig by normal non\u2010T cells. When various numbers of normal non\u2010T cells and CLL non\u2010T cells were cocultured with a constant number of normal T cells, the proliferative response and the concentration of supernatant Ig decreased as the proportion of CLL non\u2010T cells increased. Since similar results were obtained when irradiated non\u2010T cells from normal individuals were substituted for non\u2010T cells from patients with CLL, we believe that the decrease in proliferative response and diminished synthesis of Ig is not the result of the suppressor non\u2010T cells but is related to the dilution of normal B cells by inert non\u2010 T cells. We conclude that these experiments serve as an in vitro model for patients with CLL and suggest that the hypogammaglobulinemia observed in this disease is related to the diluting out of normal B cells by the accumulation of neoplastic B cells in the peripheral blood, bone marrow, and lymphoid tissue of these patients.<\/jats:p>","DOI":"10.1002\/ajh.2830250203","type":"journal-article","created":{"date-parts":[[2007,2,21]],"date-time":"2007-02-21T11:09:32Z","timestamp":1172056172000},"page":"131-142","source":"Crossref","is-referenced-by-count":13,"title":["Impaired synthesis of immunoglobulin in patients with chronic lymphocytic leukemia"],"prefix":"10.1002","volume":"25","author":[{"given":"Anthony S.","family":"Kurec","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Frederick R.","family":"Davey","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2006,7,11]]},"reference":[{"key":"e_1_2_1_2_2","doi-asserted-by":"publisher","DOI":"10.1002\/1097-0142(197808)42:2 <941::AID-CNCR2820420717>3.0.CO;2-1"},{"key":"e_1_2_1_3_2","first-page":"41","article-title":"Proposed guidelines for protocol studies. 3. 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