Hydrogen peroxide as a potential mediator of the transcriptional regulation of heparan sulphate biosynthesis in keratinocytes

Cellular & Molecular Biology Letters

Akiko Hagiwara¹  Fumiaki Nakayama³  Tetsuo Yamamoto²  Makoto Akashi³ 

[1] Department of Radiation Emergency Medicine, National Institute of Radiological Sciences, Inage-ku, Chiba, Japan$$Signaling Molecules Research Laboratory, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan$$;Department of Radiation Emergency Medicine, National Institute of Radiological Sciences, Inage-ku, Chiba, Japan$$Military Medicine Research Unit, Test and Evaluation Command, Japan Ground Self Defense Force, Tokyo, Japan$$;Department of Radiation Emergency Medicine, National Institute of Radiological Sciences, Inage-ku, Chiba, Japan$$

关键词: Heparan sulfate proteoglycan;    HaCaT keratinocyte;    Glycosyltransferase;    Catalase;    Sulfotransferase;   

DOI  :  10.2478/s11658-008-0016-7

学科分类：分子生物学，细胞生物学和基因

来源: Uniwersytet Wroclawski * Wydzial Biotechnologii / University of Wroclaw, Faculty of Biotechnology

【 摘 要 】

Ionizing radiation is one of the types of oxidative stress that has a number of damaging effects on cutaneous tissues. One of the histological features of radiation-induced cutaneous fibrosis is the accumulation of extracellular matrix (ECM) components, including heparan sulfate proteoglycan (HSPG), which are required for the repair of tissue damage, and operate by interacting with a variety of growth factors. In this study, we established a model of human HaCaT keratinocytes overexpressing anti-oxidative enzyme genes to elucidate the mechanism of oxidative stress leading to the accumulation of HSPG and the role of its accumulation. Catalase overexpression induced an increase in anti-HS antibody (10E4) epitope expression in these cells. Western blotting showed that the smeared bands of HSPG were obviously shifted to a higher molecular weight in the catalase transfectants due to glycosylation. After heparitinase I treatment, the core proteins of HSPG were expressed in the catalase transfectants to almost the same extent as in the control cells. In addition, the transcript levels of all the enzymes required for the synthesis of the heparan sulfate chain were estimated in the catalase transfectant clones. The levels of five enzyme transcripts — xylosyltransferase-II (XT-II), EXTL2, D-glucuronyl C5-epimerase (GLCE), HS2-O-sulfotransferase (HS2ST), and HS6-O-sulfotransferase (HS6ST) — were significantly increased in the transfectants. Moreover, hydrogen peroxide was found to down-regulate the levels of these enzymes. By contrast, siRNA-mediated repression of catalase decreased 10E4 epitope expression, the transcript level of HS2ST1, and the growth rate of HaCaT cells. These findings suggested that peroxide-mediated transcriptional regulation of HS metabolism-related genes modified the HS chains in the HaCaT keratinocytes.

【 授权许可】

Unknown