Related Experiment Videos
Gene expression profiling in streptozotocin treated mouse liver using DNA microarray
Eisuke Kume1, Chinami Aruga, Yukito Ishizuka
1Exploratory Toxicology and DMPK Research Laboratory, Tanabe Seiyaku Co Ltd, 2-2-50, Kawagishi, Toda, Saitama 335, Japan. e-kume@tanabe.co.jp
Summary
Streptozotocin (SZ) causes liver toxicity by altering gene expression, affecting cell cycle, immune response, and metabolism. These hepatic changes occur before elevated blood sugar, indicating direct SZ action on the liver.
Area of Science:
- Toxicology
- Molecular Biology
- Genomics
Background:
- Streptozotocin (SZ) is recognized for its toxicity to pancreatic beta cells and other organs, including the liver.
- Understanding the molecular mechanisms of SZ-induced liver toxicity is crucial for mitigating its adverse effects.
Purpose of the Study:
- To analyze gene expression changes in the liver following Streptozotocin (SZ) treatment in mice.
- To investigate the direct effects of SZ on hepatic gene expression independent of hyperglycemia.
Main Methods:
- DNA microarray analysis was performed on liver tissue from male ICR mice treated with 200 mg/kg SZ.
- Gene expression profiling was conducted at 6, 24, and 48 hours post-treatment using Affymetrix GeneChip Murine Genome U74A V.2.
- Analysis focused on identifying up-regulated and down-regulated probe sets.
Main Results:
- Over 100 probe sets were significantly up- or down-regulated at 6 and 24 hours after SZ treatment, with a decrease at 48 hours.
- Up-regulated genes were associated with cell cycle, apoptosis, immune response, and xenobiotic metabolism.
- Down-regulated genes were linked to glucose, lipid, and protein metabolism, preceding serum glucose level elevation.
Conclusions:
- Streptozotocin directly impacts liver gene expression, initiating changes in metabolic and cellular processes.
- Observed hepatic gene expression alterations precede the development of hyperglycemia, suggesting a primary role of SZ in liver toxicity.
- These findings correlate with previously reported hepatic changes like lipid peroxidation and inhibited hepatocyte proliferation.