Faculty Collaboration Database

Leukemia inhibitory factor in long-term adherent layer cultures: increased levels of bioactive protein in leukemia and modulation by IL-4, IL-1 beta, and TNF-alpha. Cancer Res 1994 Apr 01;54(7):1837-42

Date

04/01/1994

Pubmed ID

8137298

Scopus ID

2-s2.0-0028329958 (requires institutional sign-in at Scopus site)   39 Citations

Abstract

In the current study, we used a monoclonal antibody-based enzyme-linked immunosorbent assay and bioassay to assess leukemia inhibitory factor (LIF) protein levels, activity, and function in supernatants of 59 adherent layers derived from acute and chronic myelogenous leukemia, myelodysplastic syndrome, and hairy cell leukemia patients and from normal controls. We demonstrate that biologically active LIF protein is constitutively produced and secreted by cultured bone marrow stromal cells from all of the studied subjects. Furthermore, various cytokines can alter endogenous LIF protein levels. Twenty-four h of exposure to recombinant human (rh) interleukin (IL) 4 (100 units/ml) significantly decreased LIF protein levels in adherent layer conditioned media [median base line level, 2.6 ng/ml; range, 1.6-8.0 ng/ml; median post rhIL-4 exposure levels, 1.9 ng/ml; range, 0.9-5.8 ng/ml (n = 7; P = 0.022)]. In contrast, rhIL-1 beta and rh tumor necrosis factor alpha consistently increased LIF protein levels. In the samples exposed to 50 units/ml rhIL-1 beta, median base line LIF level was 2.6 ng/ml; median post-LIF level was 9.0 ng/ml (n = 8; P = 0.014). In the two samples exposed to rh tumor necrosis factor alpha (200 units/ml), LIF levels increased from baseline levels of 2.6 and 2.7 ng/ml to postexposure levels of 7.7 and 12.2 ng/ml, respectively. Finally, the presence of LIF may be relevant to both normal and malignant hematopoietic processes as evidenced by: (a) LIF protein levels in adherent layer conditioned media were significantly elevated in samples from patients with a spectrum of hematological neoplasms [acute myelogenous leukemia: median level, 3.0 ng/ml (range, 1.6-11.0 ng/ml); myelodysplastic syndrome: median level, 4.5 ng/ml (range 1.4-15.5 ng/ml); hairy cell leukemia; median level, 3.5 ng/ml (range 2.2-10.3 ng/ml); chronic myelogenous leukemia-chronic phase: median level, 4.35 ng/ml (range 0.3-19.0 ng/ml); and chronic myelogenous leukemia-blast crisis: median level, 6.25 ng/ml (range 0.7-20.3 ng/ml)] as compared to samples from normal individuals (median level, 2.0 ng/ml; range, 0.7-4.6 ng/ml; P < 0.05); and (b) in normal controls, in vitro abrogation of endogenous LIF bioactivity by neutralizing antibody decreased the number of committed granulocyte-macrophage hemopoietic progenitors.

Author List

Wetzler M, Estrov Z, Talpaz M, Kim KJ, Alphonso M, Srinivasan R, Kurzrock R

Author

Razelle Kurzrock MD Center Associate Director, Professor in the Medicine department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Blast Crisis
Bone Marrow
Cell Adhesion
Cell Line
Cells, Cultured
Growth Inhibitors
Humans
Interleukin-1
Interleukin-4
Interleukin-6
Leukemia
Leukemia Inhibitory Factor
Leukemia, Hairy Cell
Leukemia, Myelogenous, Chronic, BCR-ABL Positive
Leukemia, Myeloid, Acute
Lymphokines
Myelodysplastic Syndromes
Recombinant Proteins
Reference Values
Tumor Cells, Cultured
Tumor Necrosis Factor-alpha