Investigations on Autologous T-Cells for Adoptive Immunotherapy of Aids

  • Jan van Lunzen
  • Jörn Schmitz
  • Kathrin Dengler
  • Claudia Kuhlmann
  • Herbert Schmitz
  • Manfred Dietrich
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 374)


We report on the preclinical results of an immunotherapeutic approach of AIDS mediated by ex vivo propagated CD4+ and CD8+ T-cells. A mean yield of 6.23 x 109 lymphocytes, containing 1.82 x 109 CD4+, 3.23 x 109 CD8+ T-lymphocytes and 8.39 x 106 CD34+ peripheral blood progenitor cells (PBPC) were be obtained by continuous flow cytapheresis (CFC) in 15 asymptomatic HIV infected patients (CD4-count >350/mm3) The CD4/CD8 ratio (mean: 0.53, SD: ±0.15) in the cell concentrates reflected the distribution of the circulating lymphocyte subsets in vivo. Absolute lymphocyte counts decreased at a mean of 404/µl(25%) immediately after CFC but were replaced from the extravascular pool within one hour. Neither the CD4/CD8 ratio nor p24-antigen and neopterin levels did change significantly after cell separation. No alteration of the number of proviral DNA copies (1/103-1/106) could be detected in peripheral T-helper cells by semiquantitative PCR after lymphapheresis. Cells were cryopreserved in liquid nitrogen without substantial loss of viability or function. Ex vivo propagation of T-cells in a strictly autologous manner in the presence of PHA+IL-2 for 14d resulted in a 50-fold expansion rate (140-fold in healthy controls, p<0.001). Viral replication could be controlled but not completely eliminated by cocultivation with autologous CD8+ T-lymphocytes as measured by limiting dilution nested PCR (NPCR). The expanded cells showed the typical phenotype of highly activated memory type T-lymphocytes (CD3+ CD45RO+ CD25+ HLA-DR+). The distribution of CD4+ and CD8+ T cells did not reveal significant changes before and after culture indicating that both subsets were equally expanded. Functionally important membrane or intracellular epitopes which were found to be decreased in HIV infected subjects (CD7, CD55, CD59) before culture were reconstituted after ex vivo propagation of T-cells. The functional importance of the up-regulation of complement regulating epitopes (CD55, CD59) after culture could be proven by a significant inhibition of cytolysis of T-cells in the presence of autologous complement. The majority (75%) of expanded CD8+ T cells stained positive with mAb TIA-1 which is directed to intracellular granules within cytotoxic T-cells. Furthermore, programmed cell death of expanded T-cells could be prevented by cocultivation with fibroblasts which are believed to secrete a cytokine pattern preventing activated T-cells from apoptosis after withdrawal of IL-2 and other stimuli. Our preclinical data support the idea of reconstituting the immune response of HIV infected patients by adoptive cell mediated immunotherapy in order to an improve prevention and treatment of opportunistic diseases. The methods of cell separation, cryopreservation and ex vivo propagation are established and safe. However, before clinical application and evaluation additional studies are necessary.


Human Immunodeficiency Virus Type Acquire Immune Deficiency Syndrome Adoptive Immunotherapy Human Immune Deficiency Virus Peripheral Blood Progenitor Cell 
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Copyright information

© Springer Science+Business Media New York 1995

Authors and Affiliations

  • Jan van Lunzen
    • 1
  • Jörn Schmitz
    • 1
  • Kathrin Dengler
    • 1
  • Claudia Kuhlmann
    • 1
  • Herbert Schmitz
    • 1
  • Manfred Dietrich
    • 1
  1. 1.Clinical Medicine Section and Department of VirologyBernhard-Nocht-Institute for Tropical MedicineHamburgGermany

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