How Ozempic works: why a diabetes shot makes people stop feeling hungry
Semaglutide: how Ozempic makes a short-lived hormone last a week
Your own GLP-1 lasts minutes, and the first drug that copied it needed a shot twice a day. Ozempic needs one shot a week. Two big changes to the hormone make the difference.
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Rono gets his pens at the pharmacy on his street. Miva, the pharmacist there, hands him a new one. One pen lasts him several weeks, one shot a week.
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The drug in the pen is called semaglutide. It is not built on the lizard's molecule. It is built on human GLP-1, and chemists made two big changes to it.
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First, they swapped one building block near the front end. The enzyme that cuts GLP-1 can no longer grip it there, so it cannot snip it.
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That alone is not enough. Your kidneys clean your blood all day. A small molecule like this one would soon be washed out into the urine.
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So, second, they added a fatty tail. The tail holds on to albumin, the most common protein in your blood. Albumin is far too big to pass the filter of the kidneys, so the drug, riding on it, stays in the blood.
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At any moment, almost all of the drug is riding on albumin. Little by little, a few molecules let go and turn the GLP-1 locks, just as your own GLP-1 does.
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The result: half of a shot is still in Rono's blood a week later. So one shot a week keeps the level up, day and night.
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All week, semaglutide flows through Rono's body. One of the places it reaches is his brain.
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Quick check
A copy with no tail.
Show the answer
No. The enzyme can no longer cut it, but the kidneys would still wash it out fast. The fatty tail keeps it on albumin, and the kidneys keep albumin in.
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