Insulin might lower blood pressure and heart rate in mice, but only if their kidney cells can respond to insulin — if those cells can't sense insulin, the effect goes away.

What we've found so far is that insulin may play a role in lowering blood pressure and heart rate in mice, but only when kidney cells are able to respond to it [1]. Our current analysis shows that this effect appears to depend on insulin receptors in those kidney cells — when the cells can sense insulin, changes in blood pressure and heart rate may occur, but when they can’t, the effect disappears [1]. We analyzed the available research and found 13.0 supporting assertions indicating that insulin’s ability to influence blood pressure and heart rate is linked to how kidney cells respond to it [1]. There were no studies or assertions that refuted this idea. Still, only one distinct assertion was made, meaning our view is based on limited evidence so far. The evidence we've reviewed leans toward the idea that insulin’s action in the kidneys is involved in regulating cardiovascular functions in mice. However, we don’t yet know how strong this effect is, under what conditions it occurs, or whether other factors may be involved. Since all the supporting data come from a single assertion, our understanding is still early and narrow. We can’t say for sure whether insulin directly causes these changes, nor can we generalize beyond the conditions studied. Our analysis does not rule out the possibility that other systems or organs also play a role. As more evidence becomes available, our understanding may shift or expand. Practical takeaway: In mice, insulin might help lower blood pressure and heart rate — but only if their kidney cells can respond to it. For now, that’s the clearest link we’ve seen in the data we’ve reviewed.