Estradiol increases mucus synthesis in bronchial epithelial cells

Area of Science:

• Pulmonary Medicine
• Endocrinology
• Cell Biology

Background:

• Airway mucus hypersecretion is a hallmark of chronic airway diseases, often with worse prognosis in women.
• Estrogen's role in airway mucus production and its link to disease severity in females requires elucidation.

Purpose of the Study:

• To investigate the effects of estradiol on mucus expression in human bronchial epithelial cells.
• To identify the molecular mechanisms underlying estradiol-induced mucus production.

Main Methods:

• Primary normal human bronchial epithelial cells (NHBE) from female donors were cultured at an air-liquid interface (ALI).
• Cells were treated with estradiol, and mucus production was assessed via PAS staining and MUC5AC immunostaining.
• Protein microarray and mRNA analysis were used to identify key molecular players, including nuclear factor of activated T-cell (NFAT) and fucosyltransferases (FUTs).

Main Results:

• Estradiol treatment increased goblet cell number and MUC5AC expression in a concentration-dependent manner.
• This effect was partially mediated by estrogen receptor beta (ER-β) and involved increased NFATc1 signaling.
• Estradiol also enhanced mucin post-translational modification by increasing fucose residues and FUT mRNA expression.

Conclusions:

• Estradiol promotes mucus synthesis in human bronchial epithelium through ER-β and NFATc1 pathways.
• This mechanism contributes to understanding sex-based differences in airway inflammatory diseases.
• Findings highlight a potential therapeutic target for managing mucus hypersecretion in women.