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Your pancreas might not be running out of insulin. It might be running out of coordination.

Everyone thinks diabetes is the pancreas running out of insulin. New research says the real failure is one coordination handoff upstream — a lesson that reaches far beyond your bloodstream.

Your pancreas might not be running out of insulin. It might be running out of coordination.

Type 2 diabetes has traditionally been described as a problem of supply: the pancreas doesn't produce enough insulin, so blood sugar levels rise, and the solution is to boost the supply. A study published in PNAS in June by Sanford Burnham Prebys and the University of Michigan challenges that idea. The issue isn't one of raw materials but rather the folding line—and this folding line only appears when two proteins appear at the same time to carry out the shift.

The plan is good; the problem is at the fold.

Insulin is shipped around as proinsulin, which has to take on the correct shape before it can function; if it fails to do so then you don't end up with ineffective insulin but rather with molecular rubbish that builds up, places a strain on the cell, and harms the beta cells that are in charge of the entire process. It was known that misfolded proinsulin accumulated in diabetes, but no one knew who is in charge of quality control when it comes to the folding.

One protein can't play doubles

To find out which proteins BiP, a chaperone protein, associates with, the team looked at one cochaperone in particular: p58IPK. When p58IPK was deleted, misfolded proinsulin accumulated and mice lacking it produced less insulin. In a more rigorous experiment—overloading the cell with additional BiP while still not having p58IPK, which is the biological equivalent of assigning more supervisors to a faulty line—the improvement was minimal. Recovery of protein folding only occurred when both BiP and p58IPK were present. Their findings make it clear that just as a single tennis player is unable to play in a doubles match, BiP cannot carry out its function by itself.

The honest counterpoint

What we have here are mice and cell lines, not a treatment; yet the mechanism is clear and it's a sharp one in that almost all diabetes drugs act by increasing glucose absorption or by promoting greater insulin secretion. None of them address the fold. We have improved the output of a line whose actual problem is a coordination handoff upstream.

The mental model

The actual input you're dealing with is almost never the limiting factor; throughput problems are generally coordination issues within a capacity constraint. The bottleneck is located at the point where two components pass the data to each other, and having plenty of one resource won't overcome the absence of another. You should look for the bottleneck, not the abundant resource.

The question

Consider the thing you're scaling—whether it's your business, your output, or the particular sector of your country's economy. Identify the single point at which, if either of the two parties involved disappeared, a greater amount of the resource you are continually adding would not make any difference. That is your p58IPK. Have you actually checked whether it's understaffed—or have you merely been pouring in more BiP?

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