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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Chigusa, Yoshitsugu Mogami, Haruta Fujita, Kohei Tatsumi, Keiji Nishimura, Fumitomo Kondoh, Eiji Konishi, Ikuo |
| Description | Country affiliation: Japan Author Affiliation: Chigusa Y ( Department of Gynecology and Obstetrics, Graduate School of Medicine, Kyoto University, 54 Shogoin-Kawaharacho, Sakyo-ku, Kyoto 606-8507, Japan.) |
| Abstract | CONTEXT: Serum concentration of oxidized low-density lipoprotein (oxLDL) is higher in women with preeclampsia than in normal pregnant woman. Lectin-like oxLDL receptor-1 (LOX-1) is one of the scavenger receptors for oxLDL and is abundantly expressed in placenta. It is well known that oxLDL activates nuclear factor erythroid 2-related factor 2 (Nrf2), a master regulator of antioxidant and cytoprotective genes such as heme oxygenase-1 (HO-1), which play an important role in preeclampsia. However, it has yet to be elucidated whether LOX-1, along with Nrf2, participates in the pathology of preeclampsia. OBJECTIVE: The objective of the study was to assess LOX-1 expression and Nrf2 activation in preeclamptic placentas and to manifest their physiological roles in preeclampsia. METHODS: Expression and regulation of LOX-1, HO-1, and Nrf2 were evaluated by real-time quantitative RT-PCR and Western blotting. The functions of LOX-1 and Nrf2 were examined using an anti-LOX-1 antibody and Nrf2 activator in JAR, a choriocarcinoma cell line, and placental explants. RESULTS: Both LOX-1 expression and Nrf2 activation were significantly decreased in preeclamptic placentas compared with normal controls. A significant decrease in LOX-1 mRNA was found in placental explant cultures under hypoxic conditions. Activation of Nrf2 up-regulated HO-1 in both the JAR cells and placental explants. Furthermore, oxLDL increased HO-1 mRNA, whereas the blockade of LOX-1 inhibited the increase of HO-1 mRNA in JAR cells. CONCLUSION: Decreasing LOX-1 expression in preeclamptic placenta may contribute to high oxLDL concentration, low Nrf2 activation, and low HO-1 expression. These findings provide novel insights into the crucial role of LOX-1 and Nrf2 in the pathogenesis of preeclampsia. |
| ISSN | 0021972X |
| e-ISSN | 19457197 |
| Journal | The Journal of Clinical Endocrinology & Metabolism |
| Issue Number | 10 |
| Volume Number | 97 |
| Language | English |
| Publisher | Oxford University Press |
| Publisher Date | 2012-10-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Lipoproteins, Ldl Metabolism Nf-e2-related Factor 2 Placenta Pre-eclampsia Scavenger Receptors, Class E Antioxidants Cell Line, Tumor Choriocarcinoma Chorionic Villi Pathology Heme Oxygenase-1 Genetics Anoxia Pregnancy Rna, Messenger Uterine Neoplasms Research Support, Non-u.s. Gov't Discipline Endocrinology Discipline Metabolism |
| Content Type | Text |
| Resource Type | Article |
| Subject | Biochemistry (medical) Endocrinology, Diabetes and Metabolism Clinical Biochemistry Biochemistry Endocrinology |
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