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Modeling Ascending Vaginal Infection, Preterm Birth, and Neonatal Morbidity in Mice
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Microcystins cause embryonic toxicity in mice.

Yan-Zhen Bu1, Xiao-Yu Li, Bang-Jun Zhang

  • 1College of Life Science, Hebei Normal University, ShiJiaZhuang 050016, PR China.

Toxicon : Official Journal of the International Society on Toxinology
|September 29, 2006
PubMed
Summary

Microcystins from cyanobacteria cause toxicity in mice. High doses led to reduced maternal weight gain and fetal developmental issues, including liver damage and birth defects.

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Area of Science:

  • Environmental Toxicology
  • Developmental Biology
  • Microbiology

Background:

  • Freshwater cyanobacteria produce microcystins, potent hepatotoxins implicated in animal and human health issues.
  • Microcystins are a class of cyclic peptides known for their toxicity to the liver.

Purpose of the Study:

  • To investigate the effects of microcystins on the embryonic and fetal development of Kunming mice.
  • To determine the dose-dependent toxicity of microcystin exposure during pregnancy.

Main Methods:

  • Pregnant Kunming mice were exposed to varying doses (3, 6, 12 microg/kg) of Microcystis aeruginosa cell extracts via intraperitoneal injection from gestational days 6-15.
  • Control groups received sterile saline injections.
  • On day 18 of gestation, mice were euthanized, and fetal developmental indexes, external anomalies, and internal organ examinations were conducted.

Main Results:

  • A significant decrease in maternal body weight gain was observed in the 12 microg/kg microcystin dose group.
  • Fetuses exposed to 6 and 12 microg/kg microcystins exhibited significant differences in body weight, body length, and tail length compared to controls.
  • Adverse fetal effects included a curving tail, petechial hemorrhage, and hydropic degeneration in the liver, particularly in the higher dose groups.

Conclusions:

  • Microcystins demonstrate both maternal and embryonic toxicity in mice.
  • Exposure to microcystins during critical developmental periods can lead to significant adverse effects on fetal development and organ health.
  • These findings highlight the potential risks of microcystin exposure from cyanobacteria blooms to reproductive health.