Related Experiment Videos
The cytotoxic effect of endotoxin on bone marrow cells in zinc deficient rats
1Otsuka America Pharmaceutical, Inc, Rockville, MD 20850, USA.
Abstract:
The cytotoxic effect of bacterial lipopolisaccharide (LPS) on bone marrow cells was studied using normal and zinc deficient rats. LPS is known to release cytokines from macrophages such as TNF, IL-1, IL-6 and induce metallothionein (MT) in the liver, kidney, heart, etc. The bone marrow in zinc deficient rats with low MT levels was shown to be highly injured by 2 mg/kg LPS administration, indicating a significant decrease of bone marrow cells and an increase of adipocytes. No significant injury was observed in the rats fed with normal diet by the same dose of LPS administration. Low zinc level or low MT induction in bone marrow cells was discussed with relation to the cytotoxic effect of LPS to those cells.
Insights
Zinc deficiency exacerbates lipopolysaccharide (LPS) toxicity in bone marrow. Low metallothionein (MT) levels in zinc-deficient rats led to significant bone marrow cell damage and increased adipocytes after LPS exposure.
Area of Science:
- Immunology
- Toxicology
- Nutritional Science
Background:
- Bacterial lipopolysaccharide (LPS) triggers cytokine release (TNF, IL-1, IL-6) and metallothionein (MT) induction.
- Zinc deficiency is associated with lower MT levels.
- Bone marrow is a critical site for immune cell production.
Purpose of the Study:
- To investigate the cytotoxic effects of LPS on bone marrow cells in zinc-deficient rats.
- To determine the role of metallothionein (MT) in protecting bone marrow from LPS-induced injury.
Main Methods:
- Comparison of LPS toxicity in normal rats versus zinc-deficient rats.
- Administration of a specific LPS dose (2 mg/kg).
- Assessment of bone marrow cellularity and adipocyte presence.
Main Results:
- Zinc-deficient rats with low MT levels showed severe bone marrow injury following LPS administration.
- Significant decrease in bone marrow cells and increase in adipocytes were observed in zinc-deficient rats.
- Rats with normal zinc and MT levels exhibited no significant injury from the same LPS dose.
Conclusions:
- Low zinc levels and consequently low MT induction in bone marrow cells increase susceptibility to LPS-induced cytotoxicity.
- Zinc status is crucial for bone marrow resilience against inflammatory insults like LPS.