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The lymphotoxic action of vanadate
M A al-Bayati1, M R Culbertson, J P Schreider
1Institute of Toxicology and Environmental Health, School of Veterinary Medicine, University of California, Davis 95616.
Summary
Ammonium metavanadate causes acute lymphoid necrosis in mice, primarily in the thymus. Vanadium levels are higher in the spleen than the thymus, correlating with observed tissue damage and recovery patterns.
Area of Science:
- Toxicology
- Immunology
- Environmental Health
Background:
- Ammonium metavanadate exposure can lead to toxic effects.
- Vanadium compounds are known to impact lymphoid tissues.
Purpose of the Study:
- Investigate acute toxicity of ammonium metavanadate in mice.
- Characterize lymphoid necrosis induction and recovery.
- Correlate vanadium uptake with tissue damage.
Main Methods:
- BALB/C mice exposed to ammonium metavanadate (15.5 mg/kg) subcutaneously.
- Timed sacrifice study with 48V tracer from 0.5 to 28 days.
- Analysis of vanadium concentration in thymus, spleen, and brain.
Main Results:
- Lymphoid necrosis observed in thymus, spleen, lymph nodes, and bone marrow, most severe in the thymus.
- Necrosis peaked at 2-3 days post-exposure, with recovery by 14-28 days.
- Spleen showed higher vanadium concentration than thymus, except at 1 and 4 days.
Conclusions:
- Ammonium metavanadate induces acute, reversible lymphoid necrosis in mice.
- Vanadium distribution in lymphoid organs influences necrosis severity.
- Neurological signs observed despite low brain vanadium concentration.
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