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As a woman’s eggs are depleted, eventually bringing menopause, the ovaries’ chemical communications seem to go quiet. That corresponds to an increased risk for dementia, cardiovascular disease, osteoporosis and other age-related diseases. The earlier a woman enters this life phase, the higher her risk for developing those conditions, and the shorter her life is likely to be. And in women who enter menopause prematurely because their ovaries are surgically removed, the risks for chronic conditions are greater still. That suggests that even after the ovaries stop releasing eggs in menopause, they may still be somewhat protective to a woman’s overall health, says Dr Stephanie Faubion, the medical director of the Menopause Society. It’s just unclear how.
How delaying menopause could extend lifespan
There is some evidence, mostly in animals, that suggests prolonging ovarian function can improve health and increase longevity. In mice, for example, transplanting an ovary from a younger animal into an older one lengthens the older mouse’s life.
Scientists are now experimenting with different ways to prolong ovarian function and delay the onset of menopause in humans.
One company, Oviva Therapeutics, is in the early stages of testing – mainly in mice and cats – whether a pharmaceutical version of anti-Müllerian hormone (AMH), which modulates how many follicles mature in each menstrual cycle, could be used to reduce how many eggs are lost. (Typically, a woman loses dozens of eggs per cycle even though, in most cases, she ends up ovulating only one.)
The earlier a woman enters this life phase, the higher her risk for developing conditions such as dementia, cardiovascular disease, osteoporosis and other age-related diseases.Credit: iStock
Think of AMH as “a porous cloth that you cover around the ovary”, says Daisy Robinton, co-founder and chief executive of Oviva, which is competing for some of the funding from the White House initiative. The level of AMH dictates the size of the holes in the cloth; if there are huge gaping holes (in other words, there’s low AMH), a bunch of eggs can leave in each cycle. But if there are only small holes (meaning there’s high AMH), fewer eggs can get out.
The idea is that if a woman loses fewer eggs, she can hold onto her ovarian reserves and the ovaries’ functionality for longer, Robinton says.
A clinical trial under way at Columbia University is also trying to slow the rate at which women lose their eggs. The study is testing the use of an immunosuppressive drug called rapamycin – which is used to prevent organ transplant rejection and has become a darling of the longevity movement – in women ages 35 to 45 to see how it affects their ovarian reserve. Rapamycin influences the number of eggs that mature each month, and the drug has been shown in mice to extend ovarian function.
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The study is ongoing, and the researchers don’t know which participants received the medication or a placebo, but the lead scientist on the trial, Dr Zev Williams, says two patterns have emerged: some women appear to have a normal decline of ovarian reserve, which can be measured via ultrasounds and AMH levels, but in others, it seems to have been altered. “So, you know, that’s promising,” he says. Williams, an associate professor of women’s health at Columbia, is also applying for the health agency funding.
The experts were explicit that the goal of this type of research was not to prolong women’s periods indefinitely, nor to make pregnancy possible at age 70, although the treatments could potentially extend fertility.
The New York Times
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