Protein Tyrosine Phosphatase Activity in Insulin-Resistant Rodent Psammomys obesus
Author Information
Author(s): Joseph Meyerovitch, Yigal Balta, Ehud Ziv, Joseph Sack, Eleazar Shafrir
Primary Institution: Chaim Sheba Medical Center, Tel-Hashomer, Israel
Hypothesis
Does an increase in PTPase activity in Psammomys contribute to innate insulin resistance and that induced by a high-energy diet?
Conclusion
The study found that despite insulin resistance, Psammomys obesus has low levels of PTPase activities in major insulin-responsive tissues.
Supporting Evidence
- PTPase activity was significantly lower in Psammomys compared to albino rats in all major insulin-sensitive tissues.
- Leukocyte antigen receptor and insulin receptor levels were also found to be significantly lower in Psammomys.
- PTPase activity increased in normoglycemic Psammomys after overnight food deprivation, but not in diabetic animals.
Takeaway
This study shows that the sand rat has low enzyme activity that helps control insulin, which might explain why it has trouble using insulin properly.
Methodology
PTPase activity was measured in membrane and cytosolic fractions of liver, muscle, and fat tissues from Psammomys obesus and compared to albino rats.
Potential Biases
Potential bias may arise from the specific dietary conditions and the limited genetic diversity of the Psammomys obesus population used.
Limitations
The study primarily focuses on a single animal model, which may limit the generalizability of the findings.
Participant Demographics
Seven to 8-week-old Psammomys obesus, weighing approximately 100 g.
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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