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Thy28 partially prevents apoptosis induction following engagement of membrane immunoglobulin in WEHI-231 B lymphoma cells

Abstract

Thy28 protein is conserved among plants, bacteria, and mammalian cells. Nuclear Thy28 protein is substantially expressed in testis, liver, and immune cells such as lymphocytes. Lymphocyte apoptosis plays a crucial role in homeostasis and formation of a diverse lymphocyte repertoire. In this study, we examined whether Thy28 affects induction of apoptosis in WEHI-231 B lymphoma cells following engagement of membrane immunoglobulin (mIg). Once they were established, the Thy28-overexpressing WEHI-231 cells showed similar expression levels of IgM and class I major histocompatibility complex (MHC) molecule compared with controls. The Thy28-overexpressing cells were considerably resistant to loss of mitochondrial membrane potential (ΔΨm), caspase-3 activation, and increase in annexin-positive cells upon mIg engagement. These changes were concomitant with an increase in G1 phase associated with upregulation of p27Kip1. The anti-IgM-induced sustained activation of c-Jun N-terminal kinase (JNK), which was associated with late-phase hydrogen peroxide (H2O2) production, was partially reduced in the Thy28-expressing cells relative to controls. Taken together, the data suggest that in WEHI-231 B lymphoma cells, Thy28 regulates mIg-mediated apoptotic events through the JNK-H2O2 activation pathway, concomitant with an accumulation of cells in G1 phase associated with upregulation of p27Kip1 in WEHI-231 B lymphoma cells.

Abbreviations

Abs:

antibodies

FSC:

forward scatter

H2O2 :

hydrogen peroxide

JNK:

prolonged c-Jun N-terminal kinase

MAPKs:

mitogen-activated protein kinases

mIg:

membrane immunoglobulin

SSC:

side scatter

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Correspondence to Junichiro Mizuguchi.

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Toyota, H., Jiang, X., Asakura, H. et al. Thy28 partially prevents apoptosis induction following engagement of membrane immunoglobulin in WEHI-231 B lymphoma cells. Cell Mol Biol Lett 17, 36–48 (2012). https://doi.org/10.2478/s11658-011-0034-8

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Key words

  • Thy28
  • B Lymphoma Cells
  • Apoptosis
  • Membrane Immunoglobulin