Heterogeneity of Ia antigen expression by proliferating nonlymphocytic leukemia blast cells.

Abstract

In vitro systems were used to detect Ia-like antigens on proliferating normal myeloid and acute nonlymphocytic leukemia (ANLL) blast cells. Incubation of normal bone marrow cells with a monoclonal anti-Ia antibody and complement resulted in toxicity for both granulocyte/macrophage progenitors (CFU-GM) (toxicity 79%-100%) and cells proliferating in liquid culture in response to placenta-conditioned medium colony-stimulating factor (CSF) or medium conditioned by normal, phytohemagglutinin (PHA)-stimulated mononuclear cells. In contrast, effects of anti-Ia antibody and complement on blast colony-forming cells and 3H-TdR incorporation in liquid culture from eight patients with ANLL were variable. Colony growth with CSF after treatment was 0% to 91% of control growth and did not correlate with display of Ia-like antigens. Survival of ANLL cells growing in liquid cultures was even more variable after anti-Ia+ complement treatment (28%-227% of control). The presence of Ia-like antigens did not distinguish ANLL cells responding to PHA-conditioned medium from those responding to CSF in either colony or liquid culture. Dose-response curves for ANLL cells in liquid culture were similar before and after treatment with anti-Ia+ complement. In contrast to normal myeloid precursor cells, which show uniform display of Ia-like antigens, display of Ia antigen by proliferating leukemia cells is highly variable from patient to patient. Anti-Ia reagents such as this one would not be effective in treating ANLL marrow for autologous transplantation.

• Authors: R Taetle, J M Honeysett
• Journal: Cancer (Cancer) Vol. 56 Issue 8 Pg. 1957-62 (Oct 15 1985) ISSN: 0008-543X [Print] United States
• PMID: 3896465 (Publication Type: Journal Article, Research Support, U.S. Gov't, P.H.S.)

Chemical References

• Antibodies, Monoclonal
• Colony-Stimulating Factors
• Culture Media
• Histocompatibility Antigens Class II
• Complement System Proteins

Topics

• Acute Disease
• Antibodies, Monoclonal
• Bone Marrow (pathology)
• Bone Marrow Transplantation
• Cell Division
• Cell Line
• Cell Survival
• Colony-Stimulating Factors
• Complement System Proteins
• Culture Media
• Cytotoxicity, Immunologic
• Histocompatibility Antigens Class II (analysis)
• Humans
• Leukemia (immunology, pathology)
• Neoplastic Stem Cells (immunology)
• Tumor Stem Cell Assay