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Ovarian Toxicity in Female Rats after Oral Administration of Melamine or Melamine and Cyanuric Acid

Jiarui Sun1, Xinchen Zhang1, Yinan Cao1

  • 1College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China.

Plos One
|February 12, 2016
PubMed

Insights

Oral exposure to melamine, alone or with cyanuric acid, damages female rat ovaries. This study found reduced ovarian weight, disrupted estrous cycles, and decreased reproductive hormone levels, indicating significant reproductive toxicity.

Area of Science:

  • Reproductive Toxicology
  • Environmental Health
  • Endocrinology

Background:

  • Melamine toxicity is known for kidneys and testes.
  • Limited research exists on melamine's impact on female reproductive organs.

Purpose of the Study:

  • To investigate the effects of oral melamine and melamine-cyanuric acid mixture on female rat ovaries.
  • To assess impacts on ovarian and uterine weights, estrous cycles, and reproductive hormone levels.

Main Methods:

  • Female rats were orally administered melamine or a melamine-cyanuric acid mixture for 28 days.
  • Evaluated ovarian and uterine weights, estrous cycle length, serum hormone levels (estrogen, progesterone).
  • Conducted morphological analysis, TUNEL staining, and mRNA expression analysis of key reproductive genes.

Main Results:

  • Exposure to melamine or the mixture reduced ovarian and uterine weights and shortened estrous cycles.
  • Serum estrogen and progesterone levels were decreased in exposed rats.
  • Pathological ovarian changes included increased follicular atresia, oocyte/granulosa cell necrosis, and elevated TUNEL-positive granulosa cells.

Conclusions:

  • Melamine exposure, individually or with cyanuric acid, causes ovarian damage in female rats.
  • Observed effects include reduced reproductive hormone levels and impaired ovarian function.
  • Findings highlight the reproductive risks associated with melamine and its mixtures.

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