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Non-randomised trial, 2017

What biological mechanism might cause premenstrual syndrome and could a herbal medicine help?

In rats with stress-like PMS symptoms, a protein called MOR may play a role, and a herbal medicine (Shu-Yu capsule) may help by reducing this protein. This is rat research, not human research.

Early or limited evidence Rats with chronic stress-induced PMS-like symptoms

What they did

Researchers created PMS-like symptoms in rats using chronic stress. They measured a protein called MOR in rat brains and tested whether a herbal medicine (Shu-Yu capsule) changed MOR levels and related brain chemicals.

What they found

Stressed rats had high levels of MOR protein. The Shu-Yu capsule reduced MOR expression and reversed stress-related changes in brain chemicals, including BDNF and cAMP.

What it means for you

This animal study suggests one possible biological mechanism in PMS and that a herbal medicine might help by affecting this mechanism. However, this is rat research, not human research, so we cannot yet know if it applies to women with PMS.

About the study

Original title
Roles of the µ-opioid receptor and its related signaling pathways in the pathogenesis of premenstrual syndrome liver-qi stagnation
Authors
Song C, Xue L
Journal
Experimental and therapeutic medicine
Year
2017
Study design
Non-randomised trial
What was tested
Shu-Yu capsule (herbal medicine) vs. control
Open access
Yes

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