How a receptor works
Peptide medicines act from outside the cell: a key that fits one receptor, switches it on or blocks it, and is built to last.
Transcript and sources
- A peptide medicine doesn't need to get inside a cell to change it. So how does it work?
- It works like a key. The lock is a receptor, a protein sitting on the cell's surface.
- Only the right shape fits. The GLP-1 receptor ignores most molecules, but grips GLP-1 and the medicines built to mimic it.
- When the key fits, the receptor changes shape and passes a message inside. In a pancreas cell, that message helps release insulin.
- A key that turns the lock is called an agonist. A key that fits but won't turn is an antagonist: it blocks the lock instead.
- More medicine fills more locks, up to a point. Once most are full, adding more does little.
- And keys don't stay forever. The body clears them, which is why chemists engineer medicines to linger.
- That's the story of GLP-1 medicines: a key for one lock, redesigned to last a week.
- Try it yourself in the Peptide Lab, at peplexicon.com.
Sources