Progesterone May Help Protect Brain Cells in Parkinson's Disease
Aktie
Progesterone is often thought of as a reproductive hormone, but research continues to reveal that its effects extend far beyond the ovaries and pregnancy. One of its most important roles is in protecting the brain.
In a recent laboratory study, researchers exposed human nerve cells to toxins commonly used to mimic Parkinson's disease. These toxins damage dopamine-producing nerve cells, the same type of cells that gradually die in people with Parkinson's.
When the cells were treated with progesterone before being exposed to the toxins, many more survived. Surprisingly, this protective effect did not occur through the classical progesterone receptors found in the cell nucleus. Instead, progesterone acted through a membrane progesterone receptor called mPRα (PAQR7), located on the cell surface.
Activation of this receptor switched on powerful cell-survival pathways that help cells resist oxidative stress, reduce damage to mitochondria (the cell's energy factories), and prevent the chain of events that normally leads to cell death.
The researchers also tested compounds that selectively activated this membrane receptor. These produced similar protection, whereas drugs that activated the traditional nuclear progesterone receptor had little effect. This suggests that membrane progesterone receptors may play a previously unrecognised role in maintaining healthy brain cells.
Although these findings come from laboratory-grown human cells and not from people with Parkinson's disease, they add to the growing body of evidence showing that progesterone is an important neurosteroid. The brain not only responds to progesterone but also produces it locally, where it helps regulate inflammation, supports myelin formation, protects neurons, and promotes repair after injury.
The study reinforces a broader message that is becoming increasingly clear: progesterone is far more than a reproductive hormone. It is an essential molecule for brain health, with the potential to protect nerve cells against injury, ageing, and neurodegenerative disease.
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Image credit: Oscar Arias-Carrión1, Maria Stamelou, Eric Murillo-Rodríguez, Manuel Menéndez-González and Ernst Pöppel., CC BY 2.0