The retardation of myometrial infiltration, reduction of uterine contractility, and alleviation of generalized hyperalgesia in mice with induced adenomyosis by levo-tetrahydropalmatine (l-THP) and andrographolide

Adenomyosis is a tough disease to manage nonsurgically. Levo-tetrahydropalmatine (l-THP), a known analgesic, and andrographolide, a nuclear factor kappa B (NF-κB) inhibitor, are both active ingredients extracted from Chinese medicinal herbs. We sought to determine whether treatment of l-THP, andrographolide, and valproic acid (VPA) would suppress the myometrial infiltration, improve pain behavior, and reduce uterine contractility in a mice model of adenomyosis. Adenomyosis was induced in 55 female ICR mice neonatally dosed with tamoxifen, while another 8 (group C) were dosed with solvent only. Starting from 4 weeks after birth, hotplate test was administrated to all mice every 4 weeks. At the 16th week, all mice with induced adenomyosis were randomly divided into 6 groups, each receiving different treatment for 3 weeks: low- or high-dose l-THP, andrographolide, low-dose l-THP and andrographolide jointly, VPA, and untreated. Group C received no treatment. After treatment, the hotplate test was administered and all mice were killed. The depth of myometrial infiltration of ectopic endometrium and uterine contractility were measured and compared across groups. We found that induction of adenomyosis resulted in progressive generalized hyperalgesia, along with elevated amplitude and irregularity of uterine contractions. Treatment with either l-THP, andrographolide, VPA, or l-THP and andrographolide jointly suppressed myometrial infiltration, improved generalized hyperalgesia, and reduced the amplitude and irregularity of uterine contractions. These results suggest that increased uterine contractility, in the form of increased contractile amplitude and irregularity, may contribute to dysmenorrhea in women with adenomyosis. More importantly, l-THP, andrographolide, and VPA all seem to be promising compounds for treating adenomyosis. Similar content being viewed by others

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