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Area of Science:

  • Neuroscience
  • Toxicology
  • Environmental Health

Background:

  • Cyanobacterial neurotoxin β-N-methylamino-L-alanine (BMAA) is implicated in neurodegenerative diseases.
  • L-BMAA is an excitotoxin potentially causing neuronal death.
  • Long-term exposure to L-BMAA may contribute to Parkinson's, Alzheimer's, and ALS.

Purpose of the Study:

  • Determine the median lethal dose (LD50) of L-BMAA in mice.
  • Establish the Lowest-Observed-Adverse-Effect Level (LOAEL) for L-BMAA.
  • Investigate histopathologic lesions caused by L-BMAA exposure.

Main Methods:

  • Seventy NIH Swiss Outbred mice (35 male, 35 female) were used.
  • Mice received intraperitoneal injections of L-BMAA at doses of 0.03, 0.3, 1, 2, and 3 mg/g body weight.
  • Control groups received sham injections; tissues were analyzed over 14 days.

Main Results:

  • The presumptive LD50 of L-BMAA was determined to be 3 mg/g body weight.
  • The LOAEL for L-BMAA was established at 2 mg/g body weight.
  • L-BMAA was detected in mouse brains and livers; no histopathologic lesions were observed in any organs.
  • Male mice showed higher L-BMAA concentrations in brain and liver compared to females at specific doses.

Conclusions:

  • L-BMAA exhibits a moderate acute toxicity in mice with a defined LD50 and LOAEL.
  • Acute L-BMAA exposure did not induce observable histopathologic damage within 14 days.
  • Tissue accumulation of L-BMAA occurred, with sex-dependent differences in concentration observed.