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Decrease in the level of albumin mRNA with progression of renal failure in rats
1Research Institute for Wakan-Yaku, Toyama Medical and Pharmaceutical University, Japan.
Abstract:
Variations in the level of albumin mRNA and the transcription rate of the albumin gene in rats with adenine-induced renal failure were compared with those in normal rats. A paired feeding schedule was employed to eliminate any nutritional differences between normal rats and rats with adenine-induced renal failure. The albumin mRNA level isolated from the liver became lower as the period of adenine administration lengthened. However, there was no difference in the transcription rate of the albumin gene between the two rat groups. These results suggest that a post-transcriptional process is responsible for the renal failure-induced repression of albumin synthesis. Furthermore, plasma glucagon levels in adenine-induced renal failure specimens were markedly higher than those in the normal group, whereas we found no difference in the plasma insulin level between normal and adenine-fed rats. These investigations provide evidence that the decrease in the level of albumin mRNA in renal failure may be partly related to the elevated level of glucagon.
Insights
Renal failure in rats lowers albumin mRNA levels post-transcriptionally, not by reducing gene transcription. Elevated glucagon, not insulin, may contribute to this decrease in albumin synthesis.
Area of Science:
- Biochemistry
- Physiology
- Nephrology
Background:
- Albumin synthesis is crucial for maintaining plasma oncotic pressure.
- Renal failure is associated with altered protein metabolism.
- The specific mechanisms regulating albumin synthesis in renal failure are not fully understood.
Purpose of the Study:
- To investigate the regulation of albumin mRNA levels and gene transcription in adenine-induced renal failure in rats.
- To explore the role of hormonal factors, specifically glucagon and insulin, in albumin synthesis during renal failure.
Main Methods:
- Induction of renal failure in rats using adenine.
- Paired feeding to control for nutritional differences.
- Quantification of albumin mRNA levels in the liver.
- Measurement of albumin gene transcription rates.
- Assay of plasma glucagon and insulin levels.
Main Results:
- Albumin mRNA levels in the liver decreased with the duration of adenine administration.
- No significant difference was observed in albumin gene transcription rates between normal and renal failure rats.
- Plasma glucagon levels were markedly elevated in rats with renal failure, while insulin levels remained unchanged.
- These findings suggest a post-transcriptional regulation of albumin synthesis.
Conclusions:
- The reduction in albumin synthesis during adenine-induced renal failure is primarily regulated at a post-transcriptional level.
- Elevated plasma glucagon levels in renal failure may contribute to the decreased albumin mRNA levels.
- These results highlight a potential link between hormonal dysregulation and impaired albumin production in kidney disease.