Please use this identifier to cite or link to this item: https://doi.org/10.1038/sj.onc.1208541
Title: p44/42 MAP kinase-dependent regulation of catalase by autocrine human growth hormone protects human mammary carcinoma cells from oxidative stress-induced apoptosis
Authors: Zhu, Z.
Mukhina, S.
Zhu, T.
Mertani, H.C.
Lee, K.-O. 
Lobie, P.E.
Keywords: Autocrine
Catalase
Growth hormone
Mammary carcinoma
Oxidative stress
Issue Date: 26-May-2005
Citation: Zhu, Z., Mukhina, S., Zhu, T., Mertani, H.C., Lee, K.-O., Lobie, P.E. (2005-05-26). p44/42 MAP kinase-dependent regulation of catalase by autocrine human growth hormone protects human mammary carcinoma cells from oxidative stress-induced apoptosis. Oncogene 24 (23) : 3774-3785. ScholarBank@NUS Repository. https://doi.org/10.1038/sj.onc.1208541
Abstract: Previous microarray expression analyses have indicated autocrine human growth hormone (hGH) regulation of genes involved in the oxidative stress response. Expression analysis of antioxidant enzymes revealed that autocrine hGH increased both the mRNA and protein levels of catalase, superoxide dismutase 1 (SOD1), glutathione peroxidase and glutamylcysteine synthetase but not that of SOD2. As a consequence, autocrine hGH increased the antioxidant capacity of mammary carcinoma cells and protected against oxidative stress-induced apoptosis. Catalase activity was increased by autocrine production of hGH in mammary carcinoma cells and a catalase inhibitor abrogated protection from oxidative stress afforded by autocrine hGH. Autocrine hGH transcriptionally regulated catalase gene expression in a p44/42 MAP kinase-dependent manner and inhibition of MEK concordantly abrogated the protective effect of autocrine hGH against oxidative stress-induced apoptosis. Given that increased cellular oxidative stress is a key effector mechanism of specific chemotherapeutic agents, we propose that antagonism of autocrine hGH will improve the efficacy of chemotherapeutic regimes utilized for human mammary carcinoma. © 2005 Nature Publishing Group All rights reserved.
Source Title: Oncogene
URI: http://scholarbank.nus.edu.sg/handle/10635/130949
ISSN: 09509232
DOI: 10.1038/sj.onc.1208541
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