Scientists discover link between PCOS and anxiety

According to the researchers, maternal obesity and androgen excess induce sex-specific anxiety in the offspring.

PCOS affects more than one in ten women of childbearing age and is characterised by high levels of male hormones in the blood, menstrual disorders, insulin resistance and obesity.

"The fact that daughters of women with PCOS are at increased risk of developing the condition and that sons often develop obesity and insulin resistance, indicates that the fetal environment plays a crucial role," said the lead author.

For the study, researchers investigated 16 groups of female and male mice offspring exposed to maternal diet-induced obesity and male hormone excess to study how these environmental factors affected the mice's behaviour as well as gene expression in the brain.

After birth, half of the mice were exposed to high-fat-high-sucrose (HFHS) diet-induced obesity to also investigate the effect of diet in the offspring and the study revealed sex-specific, anxiety-like behaviour in the offspring of both normal-weight and obese pregnant mice exposed to the androgen dihydrotestosterone.

Independent of the mothers' other diet components, female offspring exposed to maternal androgens in utero developed an anxiety-like behaviour.

A HFHS diet after birth did not significantly affect the female mice's behaviour. Male offspring, on the other hand, were unaffected by the elevated maternal androgen levels, but displayed anxiety-like behaviour in response to maternal obesity.

The environmental factors also affected gene expression in the brain.

A number of genes implicated in anxiety were dysregulated in the amygdala and hypothalamus in the brain in a sex-specific manner, the researchers noted

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