Lyn Tyrosine Kinase Signals Cell Cycle Arrest in Mouse and Human B-Cell Lymphoma

  • R. H. Scheuermann
  • E. Racila
  • J. W. Uhr
Part of the Current Topics in Microbiology and Immunology book series (CT MICROBIOLOGY, volume 194)

Abstract

Tumor dormancy is an operational term used to describe a prolonged quiescent state in which tumor cells are present, but tumor progression is not clinically apparent. In order to study the mechanisms underlying tumor dormancy, we have utilized two murine models of dormancy with an aggressive murine B-cell lymphoma (BCL1) [1–3]. In the first model, BALB/c mice are immunized to the idiotype (Id) of the BCL1 immunoglobulin (Ig) before challenge with BCL1. In the second model, antibody to various epitopes on the BCL1 Ig (an IgM-λ) are injected into SCID mice before or after challenge with BCL1. In naive BALB/c or SCID mice, the tumor grows primarily in the spleen and splenomegaly is detected approximately one month after challenge with 3 x 104106 BCL1 cells. In Idimmune mice injected with 106 BCL1, 70% do not develop splenomegaly by day 60. We have used this time period as an arbitrary cut-off and have considered such mice to harbor dormant tumor. When the spleens of Id-immunized BALB/c mice that display tumor dormancy are examined, a population of dormant lymphoma cells (DLC) can be isolated by multiparameter cell sorting. The rarity of λ light chain in BALB/c mice (usually less than 0.5%) has facilitated isolation of the DLC. Examination of these cells shows that they are physiologically different from those of BCL1 cells growing in non-immune BALB/c.

Keywords

Lymphoma Tyrosine Leukemia Interferon Sorting 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1995

Authors and Affiliations

  • R. H. Scheuermann
    • 1
  • E. Racila
    • 2
  • J. W. Uhr
    • 2
  1. 1.Laboratory of Molecular Pathology and Department of PathologyUniversity of Texas Southwestern Medical CenterDallasUSA
  2. 2.Department of MicrobiologyUniversity of Texas Southwestern Medical CenterDallasUSA

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