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Hepatic level of mRNA in relation to polymorphism and strain difference in expression of cytochrome P-450g
K Nagata1, M Miyata, M Shimada
1Department of Pharmacology, School of Medicine, Keio University, Tokyo, Japan.
Abstract:
Hepatic level of mRNA for P-450g was determined in male and female rats of Sprague-Dawley, ACI and Fischer strains using a specific oligonucleotide probe. The mRNA level in female Sprague-Dawley and Fischer rats was undetectable in accordance with a very low or undetectable level of P-450g protein. The mRNA was detected in all male ACI rats, in which high levels of P-450g protein were detected. In Fischer male rats, mRNA for P-450g was clearly detected in the liver, but P-450g protein was not detected. Moreover, the mRNA was detected in the liver of all male Sprague-Dawley rats, irrespective of the expressed level or absence of P-450g protein. As a most plausible explanation of the observed discordance in the levels of P-450g mRNA and protein, translation of unstable protein for microheterogeneous P-450g is discussed.
Insights
Investigating cytochrome P-450g (P-450g) mRNA and protein levels in rat livers revealed discrepancies. Differences in P-450g expression were observed across male and female rats of different strains.
Area of Science:
- Biochemistry
- Molecular Biology
- Pharmacology
Background:
- Cytochrome P-450 enzymes (P-450s) are crucial for drug metabolism.
- P-450g is a specific isoform with varying expression patterns.
- Understanding P-450g regulation is important for drug development and toxicology.
Purpose of the Study:
- To quantify hepatic messenger RNA (mRNA) levels of P-450g in different rat strains.
- To correlate P-450g mRNA levels with P-450g protein expression.
- To investigate potential reasons for discordance between P-450g mRNA and protein.
Main Methods:
- Quantitative analysis of hepatic P-450g mRNA using a specific oligonucleotide probe.
- Assessment of P-450g protein levels in Sprague-Dawley, ACI, and Fischer rat strains.
- Comparison of mRNA and protein expression data across sexes and strains.
Main Results:
- Female Sprague-Dawley and Fischer rats showed undetectable P-450g mRNA and protein.
- Male ACI rats exhibited detectable P-450g mRNA and high protein levels.
- Fischer male rats had detectable P-450g mRNA but undetectable protein.
- Male Sprague-Dawley rats showed P-450g mRNA regardless of protein expression levels.
Conclusions:
- Significant discordance exists between P-450g mRNA and protein levels in certain rat models.
- The findings suggest post-transcriptional regulation, possibly involving unstable protein translation, as a key factor.
- This highlights the complexity of P-450g regulation and its implications in biological systems.