The Claim
Endothelial insulin receptor substrate 2 (IRS2) knockout in mice leads to whole-body and muscle insulin resistance in vivo, even though isolated myocytes show normal insulin sensitivity in vitro, suggesting that impaired endothelial insulin signaling alone can reduce muscle glucose uptake by diminishing microvascular perfusion.
What the research says
Roughly balanced
Support and challenge are close. The picture may shift as more studies come in.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
When mice have a broken insulin signal in their blood vessel lining, their muscles don’t get enough sugar—even if the muscle cells themselves work fine—because the blood flow to the muscles drops.
See the scientific wording
Endothelial insulin receptor substrate 2 (IRS2) knockout mice exhibit whole-body and muscle insulin resistance in vivo despite normal myocyte insulin sensitivity in vitro, indicating that defective endothelial insulin signaling alone can impair muscle glucose uptake by reducing microvascular perfusion.
What the research says
1 studyStudy: Muscle microvascular blood flow responses in insulin resistance and ageing
The study doesn’t look at the exact same genetically modified mice, but it shows that when blood flow in tiny vessels is impaired, muscles don’t take up glucose well, which supports the main idea in the claim.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.