Promyelocytic leukemia protein controls cell migration in response to hydrogen peroxide and insulin-like growth factor-1.

The Journal of Biological Chemistry
Erin ReinekeHung-Ying Kao

Abstract

Promyelocytic leukemia protein (PML) was originally identified as part of a chromosomal translocation that contributes to the development of acute promyelocytic leukemia (APL). Since its discovery, PML has been found to play diverse roles in different cellular processes. Notably, PML has anti-proliferative and pro-apoptotic activity that supports its role as a tumor suppressor. We have previously shown that the peptidyl-prolyl isomerase Pin1 is able to affect cell proliferation and hydrogen peroxide (H(2)O(2))-mediated cell death through modulation of the steady-state levels of PML. We have extended these studies to show that the interaction between PML and Pin1 is targeted by multiple extracellular signals in the cell. We show that H(2)O(2) up-regulates and IGF-1 down-regulates PML expression in a Pin1-dependent manner. Interestingly, we found that H(2)O(2)- and IGF-1-mediated alteration in PML accumulation regulate MDA-MB-231 cell migration. Furthermore, we show that the control of cell migration by PML, and thus H(2)O(2) and IGF-1, results from PML-dependent decreased expression of integrin beta1 (ITGB1). Knockdown of Pin1 leads to decreased cell migration, lower levels of ITGB1 expression and resistance to IGF-1- and H(2)O(...Continue Reading

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Citations

Sep 1, 2012·Journal of Biomedical Science·Ruey-Hwa ChenWei-Chien Yuan
May 11, 2012·Journal of Clinical Biochemistry and Nutrition·Masao YamasakiKazuo Nishiyama
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