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The Dementia Caregiver’s Little Book of Hope [Kindle Edition
Kenneth S. Kosik, MD, is professor of neuroscience and codirector of the Neuroscience Research Institute
It’s easy to think that the mysteries of Alzheimer’s disease will be revealed in the high-tech hallways of US medical centers and research institutes. But new discoveries are coming from far-off places like Medellín, Colombia, which may be ground zero for finding the genetic basis of this dreaded neurodegenerative disease that strips people of memories and destroys personalities.
For more than 25 years, I have worked with Dr. Francisco Lopera of Medellín’s University of Antioquia in studying the largest known family with inherited Alzheimer’s disease. Its family tree goes back 300 hundred years. Hundreds of individuals in this family are fated to get the disease. Their symptoms usually develop between the ages of 45 and 50.
Studying this community has given us a clear picture of Alzheimer’s in this genetic microcosm. We now know the gene, called presenilin 1 (PSEN1), that is responsible for this family’s disease. Knowing the gene mutation means we can predict which family members will get Alzheimer’s. Knowing whom the disease will strike, and when, offers a powerful basis for finding a treatment and determining if it is effective. The Colombian family is now part of a large prevention trial.
While most of the family members with the PSEN1 variant develop Alzheimer’s disease before age 50, a few develop it later. We have recently discovered that these individuals carry a different genetic variant that provides some protection against the disease. This modifier gene can delay Alzheimer’s onset by as much eight to 10 years. But it doesn’t provide complete protection — we haven’t seen anyone with the PSEN1 mutation who escapes Alzheimer’s disease.
In a surprisingly improbable happenstance, another large family with a different genetic mutation that also causes Alzheimer’s at an early age lives in a nearby village. This gives us an opportunity to put our findings of a modifier gene to the test in a different genetic setting.
Obstacles remain
Despite more than 100 years of research, relatively little is known about Alzheimer’s disease. Experts still don’t have a fundamental understanding of the underlying biological and physiological changes of the disease or what drives them.
The scope of the problem is daunting. Around the world, more than 40 million people are currently suffering from Alzheimer’s; more than 5 million of them live in the United States, and that number is projected to double as baby boomers age over the next 20 years. The disease already burdens our communities and our country: 15 million Americans provide care for a loved one with the disease, while Alzheimer’s health care costs exceed $200 billion a year in the US and are projected to surpass $1 trillion as the population ages.
The drug development process for Alzheimer’s disease is riddled with challenges. One issue for clinical trials is the inclusion of individuals misdiagnosed with Alzheimer’s disease. Including individuals with vascular dementia, Lewy body dementia, or even poorly understood forms of cognitive impairment — all of which can look like Alzheimer’s — can easily throw off a trial’s results. On the other hand, including those with advanced Alzheimer’s may also skew results because they may have lost too many brain cells to measurably respond to the therapy.
Researchers also face challenges when measuring trial outcomes, since they must quantify changes in the way a person thinks (cognition). Directly measuring cognition can be hard to do, so stand-ins such as brain imaging are often used to interpret whether a therapy is effective. Unfortunately, such stand-ins don’t always correlate with changes in cognition or quality of life.
A path forward
Lopera and other colleagues are now conducting a clinical trial in Colombia to test an antibody directed against a type of protein called amyloid, which collects in the brain plaques associated with Alzheimer’s disease.
Regardless of the outcome of this trial, additional research and trials in Medellín and other parts of the world may help us better identify the underlying physiology of the disease, information the global scientific community desperately needs. Expanding the scope of our understanding can help expand the pipeline for drugs to target Alzheimer’s. There are likely many ways into this problem, but one thing is certain: The only way out of it is research.
Here is a great dementia resource for caregivers and healthcare professionals.
Here is a way for nurses administrators, social workers and other health care professionals to get an easy ceu or two.
Source:
http://dementiaviews.blogspot.com/2017/01/alzheimers-study.html
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