Delineating Effects of Stress-Analogous, Low-Dose Cortisol Exposure on Human Vocal Fold Fibroblasts.
Anumitha Venkatraman, Wen-Hsuan Tseng, Susan Thibeault
PMID 40653410WHAT IT FOUND
In lab-grown human vocal fold cells, stress-level cortisol exposure for one week altered gene activity, increasing fibrosis markers and glucocorticoid signaling while reducing inflammation.
When combined with bacterial toxins, inflammation increased. These are cellular mechanisms, not clinical patient outcomes.
Key findings
01Stress-analogous cortisol exposure upregulated pro-fibrotic gene expression (ACTA2) and glucocorticoid signaling molecules (GILZ) in healthy human vocal fold fibroblasts.
02In cells exposed to both cortisol and inflammatory stimuli, inflammatory gene expression (IL1-β) was upregulated, and protein expression of α-SMA was observed.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study was conducted entirely in vitro using an immortalized cell line, not in living human subjects. The cortisol dose (100 nM) was fixed to simulate stress, but natural cortisol levels vary throughout the day and between individuals. The study used a small number of replicates (N=3 per group). The findings describe gene and protein expression changes in cells, which do not directly translate to measurable voice outcomes or clinical symptoms in patients.
Declared interests
The authors declare no known competing financial interests or personal relationships.
The easy way to misread this
Do not interpret these cellular changes as proof that psychosocial stress causes vocal fold fibrosis or voice disorders in patients. This is an in vitro study of isolated cells, and the biological mechanisms observed here have not been tested for their effect on actual human voice function or clinical outcomes.