Blocking growth hormone extends mouse lifespan
Mice live measurably longer when their growth hormone stops working normally. That is established. What is new is that a specific blockade of the growth hormone receptor produces the same effect, now rigorously tested for the first time.
Growth hormone drives growth and metabolism through a protein on cell surfaces called the growth hormone receptor. When a molecule (an antagonist) binds to that receptor without activating it, the signal is switched off. Earlier mouse lines with disrupted growth hormone signaling already showed extended lifespan. But whether this specific type of blockade also worked had not been properly tested.
What did the mouse study show?
In a large study of transgenic mice, animals whose DNA was modified so their growth hormone blocks rather than activates the receptor, both median and maximum lifespan increased significantly. Male mice lived up to 186 days longer, females up to 265 days. At two years of age, these mice were less frail and had stronger grip strength despite increased body fat, according to the researchers.
A comparable compound is already approved for humans: pegvisomant, used in acromegaly (a condition caused by excess growth hormone). That makes human research feasible in principle, though it is far from imminent.
Does this apply to humans?
Caution is essential here. People with Laron syndrome, an inherited condition in which the growth hormone receptor does not function, do not appear to live significantly longer than the general population. That gap between mice and humans is an important caveat for mouse aging studies.
The study was published in the journal Aging Cell. It confirms the direction of effect but does not automatically translate into a human intervention. What it does add is that the mechanism works via receptor blockade rather than gene deletion, a subtle but potentially relevant distinction for future drug development.
Search terms to explore further: growth hormone receptor antagonism lifespan, somatotropic axis aging mouse model, IGF-1 signaling healthspan