People with a diagnosis of dementia can also face depression. For this reason, they may end up taking antidepressant drugs. Now, a study has found that these drugs may be able to treat not just depression, but dementia itself.

A new study tests out the potential of antidepressants to tackle dementia mechanisms in the brain.

According to data cited by the Alzheimer’s Association, 1 in 10 people aged 65 and over has Alzheimer’s disease, a form of dementia, characterized chiefly by memory loss, disorientation, and having trouble with normal daily activities.  People with Alzheimer’s can often also develop mental health issues, especially depression.  For this reason, healthcare professionals may prescribe selective serotonin reuptake inhibitors (SSRIs) — a class of antidepressants — to individuals with dementia.

Recently, researchers from the University of Waterloo in Ontario, Canada, have found a surprise – SSRIs appear to inhibit the growth of dementia-specific aggregates in the brain.  These finding may not only highlight benefits for people with depression and Alzheimer’s but can also provide insights to serve as a guide to future drug development to treat the disease.  The research team reported the study’s results in the journal ACS Chemical Neuroscience.

SSRIs verses Beta-Amyloid Plaques

Medical researchers believe that a key cause of Alzheimer’s is the build-up of toxic plaques, made up of sticky beta-amyloid proteins that over-accumulate.  Beta-amyloid plaques interfere with the signals that brain cells (neurons) transmit to one another. This blocks information from circulating in the brain and contributes to the progression of dementia.  Current treatments for Alzheimer’s focus on managing its symptoms, but none, as yet, act on this underlying cause. Furthermore, developing new drugs for Alzheimer’s can be very costly and time-consuming.

In this study, the research team looked at how SSRIs — specifically, fluvoxamine, fluoxetine, paroxetine, sertraline, and escitalopram — might affect beta-amyloid aggregation in the brain.  The researchers experimented with different types and quantities of SSRIs in the laboratory, aiming to establish which types and dosages might help people with dementia.  The research team found that fluoxetine and paroxetine had the most promising effect, as they inhibited the growth of amyloid-beta plaque by 74.8 percent and 76 percent respectively.

The researchers hope that their findings — using drugs that have already gained approval from the United States Food and Drug Administration (FDA) — may pave the way to a more effective, safe, and readily available treatment for Alzheimer’s disease.  The scientists note that further research is needed to confirm these benefits before healthcare practitioners can recommend SSRIs for the treatment of dementia.