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Written By: Editorial Team | Updated : June 5, 2014 4:00 PM IST
Women nearing menopause have higher levels of a brain protein linked to depression than both younger and menopausal women, according to a study published in the US journal JAMA Psychiatry Wednesday. The findings may explain the high rates of first-time depression seen among women in this transitional stage of life known as perimenopause, said the study by researchers at Canada's Centre for Addiction and Mental Health, Xinhua reported.
'This is the first time that a biological change in the brain has been identified in perimenopause which is also associated with clinical depression,' senior author Jeffrey Meyer of the centre said in a statement. During perimenopause, a common symptom is mood changes such as crying. Rates of first-time clinical depression among this group reach 16-17 percent, and a similar number get milder depressive symptoms. Meyer has previously linked high levels of a protein called monoamine oxidase-A (MAO-A) to major depressive disorder, depressed mood related to alcohol dependence and smoking cessation, and the period immediately after childbirth. (Read: Tomatoes keep breast cancer at bay in postmenopausal women)
According to Meyer's research team, MAO-A is an enzyme that is a pro-oxidant and breaks down brain chemicals such as serotonin, norepinephrine and dopamine, which help to maintain normal mood. To investigate if MAO-A levels may explain the mood changes during perimenopause, his research team conducted brain scans of three groups of women using a brain imaging technique called positron emission tomography (PET). Among the three groups of women, 19 were of reproductive age, 27 were in perimenopause, and 12 were in menopause.
On average, levels of MAO-A were 34 percent higher in women with perimenopause than in the younger women, and 16 percent higher than those in menopause, the team said. The women in perimenopause also reported a higher tendency to cry, based on a questionnaire called the Adult Crying Inventory, and this was associated with high MAO-A levels in the front part of the brain, the prefrontal cortex, it said. The researchers had also predicted that MAO-A levels would drop during menopause, once fluctuating levels of estrogen stabilized, and this also proved to be the case. (Read: 11 symptoms of menopause that you should be aware of)
The results suggested new opportunities for prevention. 'Using PET imaging, we can test treatments to see if they can prevent this elevation of MAO-A, and potentially prevent clinical depression,' Meyer said. One approach may be a dietary supplement, which he is currently investigating in another study of women after childbirth, to prevent post-partum depression. Another approach may be to offer hormone replacement therapy at an earlier stage to prevent the fluctuation of estrogen levels, which is also linked to higher amounts of MAO-A, he added. (Read: Early menopause makes your heart more vulnerable!)
What is menopause?
Menopause is a process during which a woman's reproductive and hormonal cycles slow down, her periods(menstruation) eventually stop, ovaries stop releasing eggs for fertilization and produce less estrogen and progesterone, and the possibility of pregnancy ends. A natural event, which takes place in most women in the 45-55 age group, of menopausal onsets and rates are influenced by a combination of factors, including heredity, smoking, diet and exercise. Menopause is defined as the day after the woman's final episode of menstrual flow finishes. This date is fixed retrospectively, once 12 months have gone by with no menstrual flow at all.
In a recent trend, Indian woman have shown an increase in the early onset of menopause. According to researchers early onset of menopause is associated with an increased risk of heart conditions and stroke. Pre-menopause are the years leading up to the last period, when the levels of reproductive hormones are already becoming lower and more erratic, and the effects of hormone withdrawal may be present. Often, women who undergo hysterectomies have their ovaries removed and that precipitates rapid menopause. According to research smokers show an earlier onset of menopause by two years as compared to non-smokers. (Read: When does a woman suffer from menopause?)
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