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KMID : 0854720080280030220
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Korean Journal of Asthma, Allergy and Clinical Immunology
2008 Volume.28 No. 3 p.220 ~ p.225
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Effects of GRβ Overexpression on Steroid-induced Changes of the Whole Genes in the A549 Airway Epithelial Cells
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Lee Ho-Yeon
Park Jae-Seuk
Jee Young-Koo
Kim Youn-Seup
Kim Do-Hyung
Kim Nam-Hee
Kim Dong-Hoon
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Abstract
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Background: Glucocorticoid receptor β (GRβ) may not bind to ligands and is thought to affect gene transcription only by acting as a dominant negative inhibitor of Glucocorticoid receptor α (GRα). However, there have been few reports about the functional roles of GRβ in the steroid-induces changes of gene expression.
Objective: To investigate the functional role of GRβ overexpression in the steroid- induced changes of gene expression.
Method: The changes in gene expressions such as steroidinduced synthesis of genes, TNF-α-induced synthesis of inflammatory genes and steroid induced suppression of activated genes by TNF-α treatment were compared with and without pCMV GRβ expression.
Result: The number of genes increased by dexamethasone treatment only in the GRβ transfected group were 54.
Increased expressions of genes by dexamethasone treatment were not affected by GRβ overexpression. The number of
genes increased by TNF-α treatment only in the GRβ -transfected group were 69. Expressions of genes increased by TNF-α treatment in both the control and the GRβ -transfected group were decreased by further dexamethasone treatment in a similar manner.
Conclusion:The results of this study suggest that GRβ may not be a dominant negative inhibitor in the teroidinduced changes of genes and that it may have some functional roles in the regulation of gene expressions.
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KEYWORD
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Glucocorticoid receptor β, Steroid
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