Abstract:
:Interleukin-1beta (IL-1beta) is a pleiotropic cytokine that can induce several cellular signal transduction pathways. Here, we show that IL-1beta can induce cell cycle arrest and differentiation in the human medullary thyroid carcinoma (MTC) cell line, TT. IL-1beta induces cell cycle arrest accompanied by morphological changes and expression of the neuroendocrine marker calcitonin. These changes are blocked by the MEK1/2 specific inhibitor U0126, indicating that MEK1/2 is essential for IL-1beta signaling in TT cells. IL-1beta induces expression of leukemia inhibitory factor (LIF) and activation of STAT3 via the MEK/ERK pathway. This activation of STAT3 could be abrogated by treatment with anti-LIF neutralizing antibody or anti-gp130 blocking antibody, indicating that induction of LIF expression is sufficient and essential for STAT3 activation by IL-1beta. In addition to activation of the LIF/JAK/STAT pathway, IL-1beta also induced an MEK/ERK-mediated intracellular cell-autonomous signaling pathway that is independently sufficient for growth arrest and differentiation. Thus, IL-1beta activates the MEK/ERK pathway to induce growth arrest and differentiation in MTC cells via dual independent signaling mechanisms, the cell-extrinsic LIF/JAK/STAT pathway, and the cell-intrinsic autonomous signaling pathway.
journal_name
Cytokinejournal_title
Cytokineauthors
Park JI,Strock CJ,Ball DW,Nelkin BDdoi
10.1016/j.cyto.2004.10.005keywords:
subject
Has Abstractpub_date
2005-02-07 00:00:00pages
125-34issue
3eissn
1043-4666issn
1096-0023pii
S1043-4666(04)00297-2journal_volume
29pub_type
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