Name: アルツハイマーは人間の脳に何をするのか？ (What Does Alzheimer’s Do to the Human Brain?)
Uploaded: 2021-01-14T09:58:52.000Z
Duration: 4 min 30 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

Alzheimer’s disease is the most common cause of dementia in the world.

Nearly 50 million people worldwide have it, and every 66 seconds

someone in the United States is diagnosed with it.

It’s been called the epidemic of our century, but even after decades of research, finding

a way to prevent this disease has been a puzzle that

Now, we may be closer than ever to solving it.

- I personally have a lot of hope that we will see the first survivors of Alzheimer's

I'm a neurologist and I'm a neuroscientist focused on Alzheimer's

Alzheimer's disease is a progressive condition, typically starting in the part of the brain

It then spreads, causing trouble with memory, cognitive abilities

and eventually, loss of bodily functions.

It's a relentlessly progressive condition that leads to

Age is the most common risk factor for Alzheimer's.

In fact, about a third of individuals ages 85

And while the exact onset of this disease is not known, what is known is that it

is characterized by a buildup of toxic proteins in the brain.

- There are two main hallmarks of Alzheimer's disease in the brain.

One of them is amyloid beta, which builds up in plaques outside of

And the other one is tau, which is a fibrillar protein, which builds up inside of neurons.

Both of these proteins are toxic, and ultimately they

lead to dysfunction and death of neurons.

As these proteins accumulate and neurons start to die, the brain’s immune system

- The immune cells of the brain, called microglia, try to get rid of these toxic protein substances.

And they also try to get rid of the dead neurons.

Ultimately, this immune response leads to chronic inflammation of the brain.

Over a longer period of time, as the disease progresses

and neural cell death continues, the affected brain

And that’s about when symptoms start to show.

- Although it starts typically in areas that affect our memory, ultimately it starts affecting

areas that control our movements, that control our

And in the terminal stages of this condition, our patients with

Alzheimer's disease lose their ability to move, and

And at the end our patients unfortunately succumb to pneumonia,

malnutrition, generalized sepsis of the body.

And this is all because of Alzheimer's disease and

And while this all sounds dire, decades of studies on patients show that there may be

a window of opportunity to prevent the condition advancing

- We know that 10 or 20 years before the symptoms of Alzheimer's disease can be observed, there

We know this from biomarker studies looking at levels of abnormal

proteins in the spinal fluid, in the brain, or in blood.

So biomarkers are quantifiable measures that can help us detect disease

So for example, we can think blood glucose levels as being a biomarker for diabetes.

We can think about blood pressure measurements as being a biomarker

In the same vein, we have developed, and continue to develop biomarkers for

And while these biomarkers are important to follow the disease’s progression the research

Right now, knowing a patient's risk factors can help them make choices to slow the

- Those risk factors that are bad for your heart are generally bad for your brain.

So diabetes, hypertension, smoking and obesity are risk

On the flip side, What we recommend to our patients, and even

the general public is that they stay engaged, both

That can be anything from exercise to maintaining a strong social network.

- We are also at an amazing time in research and clinical studies.

We are able to combine clinical information with very complex genetic and

This helps us try and identify the very complex molecular perturbations