Why Researchers identify insulin-mimicking molecules that could treat diabetes

A recent study explored whether a molecule unrelated to insulin could perform the same role as insulin.
Using cryo-electron microscopy, the researchers identified a small non-insulin-related protein that can activate the human insulin receptor.
This finding paves the way for the future development of an insulin-mimicking oral pill to replace daily insulin injections for people with diabetes.
When food is broken down in the gut, glucose is released into the bloodstream. In response,
which “instructs” the fat, muscle, and liver cells to take up glucose
a condition in which the body does not produce the hormone insulin or makes very little of it. Without insulin, glucose remains in the blood and cells lack the energy needed to maintain life.
control their blood glucose levels and energy absorption. Most commonly, insulin is injected using either a syringe, insulin pen, or insulin pump. This has several
injection pain
discomfort for people with needle phobia
possible non-compliance with injection routine
Now, researchers at the Walter and Eliza Hall Institute (WEHI) in Melbourne, Australia, in collaboration with researchers at Lilly, have identified a protein that mimics the role of insulin, potentially paving the way for the development of an oral pill to replace insulin injections.
The road to developing an insulin pill

The obstacle to oral insulin administration is the fact that insulin is a protein that is digested in the stomach before it reaches the bloodstream.

For insulin to work, it must get past the stomach and into the bloodstream still intact, to be transported to the insulin receptors on fat, muscle, and liver cells.

In recent years, there have been many
an MIT-led research team developed an ingestible, self-orienting capsule containing a small needle that could inject insulin directly into the stomach wall.
molecules that mimic insulin’s ability to activate the human insulin receptor, which in turn, triggers blood glucose uptake. Yet this is not an easy feat.
Ph.D., professor of biological and biomedical sciences at Ulster University, explained to Medical News Today that, “insulin […] has a complex structure which has defeated chemists trying to make a small molecule mimetic that can be taken orally.”
Ph.D., professor of molecular biosciences at the University of Texas at Austin, noted to MNT:
“It has been difficult to make an insulin-supplanting pill as insulin is a protein that would be digested in the gut, and any insulin-mimicking ‘pill’ would have to survive being digested as well as be absorbed into the bloodstream.
Cryo-EM involves flash-freezing solutions of biomolecules and then bombarding them with electrons to produce magnified images of individual molecules. Using cryo-EM, researchers can generate 3D images of the insulin receptor and observe how insulin and other molecules alter its shape.
Novel technology sheds light on insulin receptors

When insulin interacts with the human insulin receptor present in fat, muscle, and liver cells, it induces a structural change in the receptor.
Ph.D., study first author and senior research officer at WEHI, described the interaction between insulin and the receptor as being “like a hand bringing a pair of tongs together.”

Certain peptides (short chains of amino acids linked together by peptide bonds) are known to interact with the insulin receptor similarly to insulin.

The researchers used cryo-EM to examine the interaction between these peptides and the insulin receptor at a molecular level.

Why Researchers identify insulin-mimicking molecules that could treat diabetes

The researchers used cryo-EM to examine the interaction between these peptides and the insulin receptor at a molecular level.