Impact of Glucagon Receptor Knockout on Liver Metabolism in Mice
Author Information
Author(s): Yang Jianxin, MacDougall Margit L, McDowell Michael T, Xi Li, Wei Ru, Zavadoski William J, Molloy Mark P, Baker John D, Kuhn Max, Cabrera Over, Treadway Judith L
Primary Institution: Pfizer Global Research and Development
Hypothesis
What are the hepatic and systemic consequences of full glucagon receptor antagonism in mice?
Conclusion
The study found that complete ablation of hepatic glucagon receptor function leads to significant metabolic changes in the liver, improving glycemic control but potentially causing adverse lipid changes.
Supporting Evidence
- The study identified 899 differentially expressed genes and 86 proteins in the liver of GCGR knockout mice.
- Significant down-regulation of gluconeogenesis and up-regulation of glycolysis were observed.
- Plasma metabolite profiling showed increased levels of amino acids and bile acids in knockout mice.
Takeaway
Scientists studied mice without a glucagon receptor and found that their liver changed a lot, helping control blood sugar but also causing some bad effects on fats.
Methodology
The study involved transcriptomic and proteomic analyses of liver samples from glucagon receptor knockout mice and wild-type controls, along with plasma metabolite profiling.
Potential Biases
Potential bias due to the genetic knockout model, which may not fully mimic the effects of pharmacological inhibition.
Limitations
The study was conducted in the fed state, which may not reflect the full metabolic status during fasting, and the findings may not fully represent the effects of pharmaceutical inhibition of GCGR.
Participant Demographics
Male mice, aged 3-4 months, with both knockout and wild-type groups.
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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