(BBC) – Human trials of a cholesterol-lowering vaccine to help prevent heart disease are under way after successful studies in mice.
Researchers at the Medical University of Vienna are testing the safety of their experimental treatment in 72 volunteers.
The jab is designed to stop fatty deposits from clogging the arteries.
It would offer patients an alternative to taking daily pills to cut their risk of stroke, angina and heart attacks.
It will take years more of testing to know if the treatment will be safe and effective enough for human use, Dr Guenther Staffler and colleagues from The Netherlands Organisation of Applied Scientific Research say in the European Heart Journal.
Even if it does become available, in six years’ time, it should not be seen as an excuse for people to avoid exercise and eat lots of high-fat food, they add.
The jab helps the body’s immune system to attack a protein, called PCSK9, that would otherwise allow “bad” low density lipoprotein (LDL) cholesterol to build up in the bloodstream.
The researchers envisage that patients could have a yearly booster shot to top up their immunity.
In mice, the treatment cuts LDL cholesterol by up to 50% over 12 months and appears to protect against the build-up of fatty deposits in the arteries (atherosclerosis).
What happens next?
The first phase of testing on 72 human volunteers should be completed by the end of the year.
This will check if there are any safety issues or side-effects before more studies in people can begin.
There is a concern that the therapeutic vaccine might increase the risk of diabetes.
The researchers at the Medical University of Vienna who are conducting the human studies will be on the look out for this.
Dr Tim Chico, a cardiologist from the University of Sheffield, said: “Many questions remain about whether this approach could work in man.
“This is yet more proof that cholesterol causes heart disease, and lowering cholesterol reduces risk of heart disease, so it confirms the importance of a healthy lifestyle for everyone and medications such as statins for some people to reduce risk of heart disease.”
Prof Sir Nilesh Samani, from the British Heart Foundation, said: “Finding new ways to manage people’s cholesterol levels is absolutely vital.
“Although only tested in mice, this vaccine could lead to a simple way to target high cholesterol and ultimately reduce people’s risk of heart disease.”