KOGAMI Yoshitoyo RESEARCH INSTITUTE, AICHI CANCER CENTER, RESEARCHER, 研究所, 研究員 (30270721)
OGURA Michinori RESEARCH INSTITUTE, AICHI CANCER CENTER, RESEARCHER, 研究所, 研究員 (40231229)
|Budget Amount *help
¥2,900,000 (Direct Cost : ¥2,900,000)
Fiscal Year 1998 : ¥1,300,000 (Direct Cost : ¥1,300,000)
Fiscal Year 1997 : ¥1,600,000 (Direct Cost : ¥1,600,000)
Immunologocal recovery after purified hematopoietic stem cell transplantation was analyzed in 15 patients with hematological malignancy. 2.3x 10＼o＼ac (＼s＼up 90,7)/kg (median) of CD34 positive hematopoietic stem cells were purified by Isolex System using anti-CD34 monoclonal antibody and immuno-magnetic beads. Lymphocyte/NK cell subpopulations in peripheral blood were monitored after transplantation. Increase of CD57+, DC8+ cell was observed after one month of transplantation. One patient transplanted by preconditioning of total body irradiation (TBI) and melphalan showed a remarkable increase of CD57+, CD8+ cells after cytomegarovirus infection, and its increse was persited for more than 8 months with abnormarity of chromosome in 2/20 PB cells and oligoclonal TCR rearrangement bands. Including this patient, high frequency of opportunistic infections was observed in patients treated with TBI and CD34 positive selection. These findings suggest that add-back of T cells is necessary in order to reconstitute the immunological deficient state after CD34 positively selected transplantation
In order to make the model of adoptive immunotherapy for malignangt lymphoma, we established a IL-2 dependent culture cell line from nasal type NK/T cell lymphoma. This cell line was CD2+, sCD3-, CD3ε+, CD8-, CD16+, CD56+, CD94+, CD158a, b-and TIA1+, granzyme B+. Clonal integration of EB virus was detected, and type II latency pattern (LMP-1+, EBNA2-) of EB virus infection was observed. This cell line will be a useful target cell for the induction of cytotoxic T cells against EB virus cell suface antigen.