Valproic Acid and Progestin Inhibit Lesion Growth and Reduce Hyperalgesia in Experimentally Induced Endometriosis in Rats

Maohua Liu, Mao-Hua Liu, Xishi Liu, Yu‐Qiu Zhang, Yuqiu Zhang, Sun‐Wei Guo, Sun-Wei Guo
Reproductive sciences (Thousand Oaks, Calif.) · 2012 · vol. 19(4) , pp. 360–373 · doi:10.1177/1933719111424453 · PMID:22344726 · W1972640183
article OA: closed CC0 ⤵ 45 in-corpus citations
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⚙ AI-generated summary by claude@2026-06+body, 2026-06-10 ⓘ

Valproic acid and/or progesterone treatment reduced endometriosis lesion size, improved hyperalgesia, and increased weight gain in rats, with valproic acid showing good tolerability.

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⚙ AI-generated deep summary by claude@2026-06, 2026-06-10 ⓘ

The study evaluated whether valproic acid (VPA) alone or with progesterone (P4) affects lesion growth, pain-related behaviors, and serum TNF-α levels in 77 adult female rats with experimentally induced endometriosis created by autotransplanting uterine tissue (ENDO) into the pelvic cavity. After surgery, ENDO rats were randomized to low- or high-dose VPA, P4 alone, VPA+P4, or no treatment, with BLANK/SHAM controls receiving no surgery or no additional treatment; hot plate and tail-flick latencies, body weight, TNF-α, and lesion size were measured over 4 weeks. VPA and/or P4 significantly reduced lesion size and improved response latencies to noxious thermal stimuli, while TNF-α increased after surgery but eventually declined regardless of treatment. The paper’s explicit caveat is that VPA was assessed only in this specific rat model and outcome set, without broader mechanistic verification beyond the measured endpoints. This paper is centrally about endometriosis — specifically, it tests VPA (a histone deacetylase inhibitor) and P4 in a rat endometriosis model to inhibit lesion growth and reduce hyperalgesia.

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Condition tags

endometriosis

MeSH descriptors

Endometriosis Histone Deacetylase Inhibitors Hyperalgesia Progesterone Valproic Acid Animals Body Weight Body Weight Disease Models, Animal Endometriosis Endometriosis Endometriosis Female Histone Deacetylase Inhibitors Hyperalgesia Hyperalgesia Hyperalgesia Pain Measurement Pain Measurement Progesterone

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