Effect of deprivation of serotonin by p-chlorophenylalanine on induction and maintenance of pseudopregnancy in female rats

Fumihiko Maekawa, Korehito Yamanouchi

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The effect of serotonin synthesis inhibitor, p-chlorophenylalanine (PCPA), on induction and maintenance of pseudopregnancy as indicated by deciduoma formation was examined in female rats. Animals were injected with 1 mg/kg b.wt. of reserpine on the day of metestrus, and silk thread was passed through and placed in the left uterine horn 3 days after reserpine to induce deciduoma. PCPA (100 mg/kg b.wt.) was injected dally for 4 days before or after reserpine in 15 and 13 rats, respectively. A single injection of PCPA was administered before reserpine in nine females. In another group of rats (N = 16), instead of PCPA, saline was injected four times before reserpine. Nineteen female rats were treated with reserpine only as a control group. Results showed 89% of the control and 81.3% of the saline-treated females had massive deciduoma in traumatized uterine horn. In contrast, only 33.3% or 46.2% females with daily treatments of PCPA for 4 days before or after reserpine showed positive decidual reaction. In addition, 88.9% of females with single injection of PCPA possessed uterine horns with deciduoma. These results suggest that 4 days of treatment with PCPA eliminate induction and/or maintenance of pseudopregnancy. Thus, some levels of serotonin are required to induce and maintain pseudopregnancy.

Original languageEnglish
Pages (from-to)317-321
Number of pages5
JournalBrain Research Bulletin
Issue number5
Publication statusPublished - 1996



  • Decidual response
  • Female rat
  • p-Chlorophenylalanine
  • Pseudopregnancy
  • Reserpine

ASJC Scopus subject areas

  • Neuroscience(all)

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