Hirudin

Hirudin

Hirudin is a special substance made by leeches. Leeches are small, jawless creatures that drink blood. This substance is a peptide found in the leech's salivary glands. It helps stop blood from clotting, so the blood keeps flowing smoothly. This is important for leeches when they feed, as it helps the host's blood continue to flow after they make a small puncture in the skin.

Leeches, like Hirudo medicinalis, use hirudin to feed effectively. Without it, the blood would clot too quickly, and the leech wouldn't get enough to eat. Hirudin is part of a group of molecules that stop certain enzymes from working. Other substances in this group include haemadin and antistasin, which also help control blood clotting.

Hirudin is very important in medical research and treatments because it can prevent blood clots. Scientists study it to learn how to make better medicines for conditions where blood clots can be dangerous. This small substance from a leech helps us learn more about keeping blood healthy and flowing.

Structure

In the late 1800s, a scientist named John Berry Haycraft found that leeches make a special substance called hirudin. This substance stops blood from clotting, which helps leeches drink blood. Hirudin is made from 65 small parts called amino acids, arranged in two sections. One section folds tightly with three special bonds, while the other is loose. Scientists learned more about hirudin in the 1970s. Today, we can make hirudin in laboratories using special methods.

Biological activity

Hirudin is a natural substance found in leeches that stops blood from clotting. It works by blocking a substance called thrombin, which helps form blood clots. By blocking thrombin, hirudin keeps blood flowing and can help treat some blood problems and skin conditions.

Unlike some other blood-thinning medicines, hirudin only blocks active thrombin and does not change many other proteins in the blood. This makes it helpful in certain medical cases where other treatments might not work as well.

Medical use

Scientists can now make a special protein called hirudin in labs using a process called recombinant biotechnology. This helps doctors create medicines that prevent blood from clotting too fast. Some of these medicines are:

• recombinant hirudin from Hansenula (Thrombexx, Extrauma)
• lepirudin (Refludan)
• desirudin (Revasc/Iprivask)
• bivalirudin

These medicines help keep blood flowing for people who need it.