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1Gastroenterology and center of Digestive Endoscopy, The Second Hospital of Jilin University, Changchun, Jilin, China.
Abstract:
Nitric oxide (NO) plays a key role in inflammation. It is partly produced by three forms of NOS: eNOS of inflammatory cells, nNOS of neural cells and iNOS (inducible isoform). Estrogens can cause an anti-inflammatory effect, although it is not yet clear through which NOS isoforms. The aim of this study was to evaluate the role of the different NOS isoforms, as well as estrogen receptors (ERs) α and β, on the anti-inflammatory effects of estrogens. To avoid the influence of endogenous glucocorticoids or sexual hormones, male rats were hypophysectomized. Animals were segregated into two control groups (no-treatment control group and SHAM-operated animals) and three hypophysectomized groups (no-hormonal treatment, with estradiol-17β, or with testosterone replacement treatment). Freund's complete adjuvant (1 mg) was administered to the footpad of all animals. Measurements were made based on footpad inflammation (with a plethysmometer) such as eNOS, nNOS, iNOS and ER α and β protein expression (by immunohistochemistry principle/method) on days 1, 7 and 14. Only estradiol decreased inflammation, accompanied by increased levels of eNOS and nNOS and differential expression of ERs α and β in the inflammatory infiltrate. The higher levels of estradiol-induced eNOS and nNOS ocurred perhaps through the activation of ER β.
Insights
Estrogen
Area of Science:
- Molecular Biology
- Endocrinology
- Immunology
Background:
- Nitric oxide (NO) is crucial in inflammation, produced by endothelial (eNOS), neural (nNOS), and inducible (iNOS) nitric oxide synthases.
- Estrogens exhibit anti-inflammatory properties, but the specific nitric oxide synthase (NOS) isoforms involved remain unclear.
- This study investigates the roles of NOS isoforms and estrogen receptors (ERs) α and β in mediating estrogen's anti-inflammatory effects.
Discussion:
- Hypophysectomized male rats were used to isolate estrogen's effects from endogenous hormones.
- Estradiol administration reduced inflammation induced by Freund's complete adjuvant.
- This reduction correlated with increased eNOS and nNOS protein expression and altered ER α and β levels in inflammatory cells.
Key Insights:
- Estradiol significantly decreased inflammation in hypophysectomized rats.
- The anti-inflammatory effect of estradiol was associated with elevated eNOS and nNOS levels.
- Differential expression of ER α and β suggests a complex interplay in mediating estradiol's actions.
Outlook:
- Estrogen's anti-inflammatory effects may be mediated through ER β activation, leading to increased eNOS and nNOS.
- Further research is needed to elucidate the precise signaling pathways linking ERs and NOS isoforms in inflammation.
- Understanding these mechanisms could lead to novel therapeutic strategies for inflammatory conditions.
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