Human tumor cells, modified by a novel pressure/crosslinking methodology, promote autologous lymphocyte proliferation and modulate cytokine secretion

Avi Eisenthal, Yechiel Goldman, Yehuda Skornick, Anna Gelfand, Diana Buyaner, Issac Kaver, Alon Yellin, Henry Yehoshua, Beatriz Lifschitz-Mercer, Amnon Gonnene, Meir Shinitzky

Research output: Contribution to journalArticlepeer-review

Abstract

Hydrostatic pressure (P) combined with membrane protein crosslinking (CL) by adenosine dialdehyde (AdA) can render tumor cells immunogenic. We have recently shown that PCL treatment of murine tumor cells augmented the presentation of MHC-restricted tumor-associated antigens and enhanced cell- mediated immunity. In cancer patients inoculated with autologous PCL-modified tumor cells, a significant delayed-type hypersensitivity response was elicited. Since the balance between cell-mediated immunity and humoral immunity is reciprocally controlled by immunoregulatory cytokines, we have examined the proliferative response and cytokine secretion pattern in cultures of human peripheral blood mononuclear cells (PBMC) stimulated by autologous PCL-modified and unmodified tumor cells. These tumor cells were obtained from freshly resected tumor tissue of 16 patients with colon (8), lung (4) and renal (4) carcinomas. The results demonstrated that PCL- modified tumor cells promoted an increase in PBMC proliferation in 5 out of 8 (63%), 1 out of 4 (25%) and 4 out of 4 (100%) colon, lung and renal cell carcinomas. Fourteen of the above cultures were also analyzed for the secretion of interleukin-10 and interferon-γ. Overall, a substantial decrease in IL-10 secretion was detected in 9 out of 14 (64%) cultures while a reciprocal increase in interferon-γ secretion was noted in 8 out of 14 (57%) cultures. Our results confirmed that PCL-modified human tumor cells of different etiologies can modulate the pattern of cytokines released from stimulated autologous lymphocytes. Such a procedure could prove valuable in the production of autologous tumor vaccines.

Original languageEnglish
Pages (from-to)304-310
Number of pages7
JournalCancer Immunology, Immunotherapy
Volume46
Issue number6
DOIs
StatePublished - 1998
Externally publishedYes

Keywords

  • Crosslinking
  • Cytokines
  • Hydrostatic pressure
  • Immunotherapy
  • Tumor vaccine

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