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Requirement of the JNK-associated Bcl-2 pathway for human lactoferrin-induced apoptosis in the Jurkat leukemia T cell line

Authors
Lee, Shin-HeePark, Sang WonPyo, Chul-WoongYoo, Na-KyungKim, JiyoungChoi, Sang-Yun
Issue Date
1월-2009
Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
Keywords
Lactoferrin; Apoptosis; JNK; Bcl-2
Citation
BIOCHIMIE, v.91, no.1, pp.102 - 108
Indexed
SCIE
SCOPUS
Journal Title
BIOCHIMIE
Volume
91
Number
1
Start Page
102
End Page
108
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/120819
DOI
10.1016/j.biochi.2008.05.004
ISSN
0300-9084
Abstract
The cell proliferation of p53-deficient Jurkat T cells is controlled after prolonged exposure to human lactoferrin (U). However, the molecular mechanism by which Lf influences these cellular responses remains unclear. In this study, we demonstrate that U-induced apoptosis in Jurkat T cells occurs in a dose- and time-dependent manner via the regulation of c-Jun N-terminal kinase (JNK) activity. Jurkat cells exposed to Lf for 1 day, especially at concentrations in excess of 500 mu g/ml, showed typical apoptosis, as indicated by decreased cell viability and increased Annexin V binding. Our results also showed that Lf induced the activation of caspase 9 and caspase 3 activation, as demonstrated by our detection of cleaved caspases and PARR Lf-induced apoptosis did not influence Bcl-2 expression via an ERK1/2 phosphorylation pathway, but was rather associated with the level of BCL-2 phosphorylation. The treatment of cells with the specific JNK inhibitor SP600125, but not the p38 MAPK inhibitor SB203580, revealed that the JNK-Bcl-2 signaling cascade is required for U-induced apoptosis. When JNK activation was abolished by SP600125, no Bcl-2 phosphorylation was detected, and the Lf-treated Jurkat cells did not undergo cell death. These findings indicate that Lf functions as a biological mediator of apoptosis in the human leukemia Jurkat T-cell line, via the JNK-associated Bcl-2 signaling pathway. (C) 2008 Elsevier Masson SAS. All rights reserved.
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