Alzheimer's disease - plaques, tangles, causes, symptoms & pathology
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- Опубліковано 27 вер 2024
- What is Alzheimer's disease? Alzeimer's (Alzheimer) disease is a neurodegenerative disease that leads to symptoms of dementia. Progression of Alzheimer's disease is thought to involve an accumulation of beta-amyloid plaque and neurofibrillary tangles in the brain. Find our full video library only on Osmosis: osms.it/more.
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You guys have no idea how many students are being helped by your team.....thank you Osmosis.
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Osmosis Extremely helpful videos. Amazing team!
Why read a huge book full of uninteresting and fairly meaningless dribble when you can just watch one of these really insightful and succinct videos. Cheers Osmois.
L
I’m just watching because I’m bored
My grandmother had Alzheimer's. I remember her looking at an old picture of her and my grandfather, pointing at it and saying "He left me" He didn't leave her. He died in 2012 and she forgot due to her illness. She died in September 2018 only 2 months away from becoming 90. Diseases that cause memory loss are things I wouldn't wish upon my worst enemy.
Man my grandmother had the same thing she couldn't remember some people
It is a very sad thing
Episodic memory loss
It’s worse than cancer because your lost in your own mind and you loss all memories of yourself so you basically lose your identity
My fear for my grandmother.. she already currently deals with aphasia 😢
it's the best video on Alzheimer I've ever seen. it helped me in my exams alot. Thanks
Hope you wrote exam well . God gave me a big exam that is dementia.
R u medical student..??
@@striker1011 hello,how are you now?
@@trofaznimotor901 I am fine sir. Happy & curious every day of my life 🙏
Hands down, the most concise and simple explainatory video on All i have seen online. Like always, thanks!
Wow, thanks for the feedback, Rohit! 🙏🏻
Rohit koi mil gya vala?
A very well described video Thanks !!!
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Osmosis , thank you for existing. You can't even imagine how much you guys have helped me to clear my annual exams in medical college. Every prof was so easy because of you and I never had to have sleepless nights to study and cram diseases from books, your videos were enough for me to write about a disease in exams. Please never stop making content. I will always watch your videos despite being a practicing physician.
Thanks for making us part of your medical education and professional journey, Delcy! We're glad that you shared this with us. Definitely made our day! 🥰❤️🙏🏼
Oh my god
Our professor took 3 hours explaining that desease and we have not understood almost anything
But you with that video in 9 minutes made it really simple and clear
Man you are extremely genius
You are talented
Thank you so much 💙💙💙💙
Happy to help! 🙏🏼 ❤️ 😊
My mother passed way at the age of 39 the doctor didn't get the disease but the symptom is related to this...
It was really heartbreaking ....She didn't even know us
My 7 year old brother and 16 year me
didn't even got a chance to say a last goodbye to her........
I wish i had a chance to show that how much i love her
wow. Hope you both are doing well
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My grandpa had this and he was an amazing man. I wish I had spent more time with him. May he Rest In Peace, and thank you for educating thousands of people and helping them grow. Keep doing what you’re doing! 🤍
. When I see this post I remember Dr. Osemuahu. He really made me believe in him so much. by healing me months ago with his herbal treatment from Alzheimer disease. I really appreciate you very much and he is able to cure you from any sickness and he also cured my cousin from Ischemic heart disease thanks to him ...if you have any diseases let me know so I can link you up with him ..
Peace to those who have unease from this disease
-one day in Heaven will be healing for all! 🗻🌅🌳⛅️😇💫
Sorry for your loss.
@@-HolySpiritDove- 8
Got a neuro exam tomorrow so going through your videos as a refresher. They’re well made, thanks a ton!
What grade did you get
@@filefolder3 he failed
My grandmother has Alzheimer’s or dementia. Once she didn’t recognize photos of her deceased husband, and has forgotten what relation my deceased father (her son) was to her. I hope that one day Alzheimer’s and all other forms of dementia will be cured. 💜
Alzheimer can be cured naturally. Contact @herbalistehi for cure and any other disease/virus.
Helping teachers and students equally ❤.
Our pleasure to help 🙏🏼
When it comes to neurology, we all are helpless as these diseases don't have a definitive cure.
Hope this field grows faster!
At this moment prevention looks like the only way of slowing it down. Dr Bredesen is doing research for trying to prevent Alzheimer's. He is hoping to reverse the symptoms.
I finally understand the actual biology behind this disease. Life saver for my final!!!
Incredibly helpful with an excellent presentation. Thanks so much!
+Charles Jacocks We're really glad that you found it useful. You're very welcome.
You can pledge to support them with as little as $1/month :) :)
Alzheimer can be cured naturally. Contact @herbalistehi for cure and any other disease/virus.
These are by far the most helpful medical videos I've come across! I love how concepts are clearly and concisely explained, relevant information included. I got more from these 10min videos than from hours of lecture and reading textbooks. Thanks so much, you guys are doing an incredible job!
+iSedma Thanks so much!!
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After discussing with some people working with numerous patient affecter by this disease, I've learned that this disease seems to act like a chronological undoing of the brain. The patient gradually forget about more recent memories and abilities, and seem to go through the stage of human maturation in reverse. It seems strange to me that "random" cell degeneration would lead to such a process instead of a more random loss of function and memories.
Chronological undoing of the brain is definitely a great way to explain what Alzheimers appears to be. It happens like that because a lot of the plaques and tangles start in the hippocampus (where recent memories and hearings are formed) and then spread into different regions of the brain eventually to the area in the brain that regulates heart and breathing killing the patient. The spread of the plaques and tangles cause the "chronological" phases of the Alzheimers.
Alzheimers Disease is characterized for the randomness of the progression that the neurons die. Not all cases are the same although there is a set of stages from start to finish. Other dementias are characterized other ways. Frontotemporal demetia begins in the frontal lobe and the section on the side of the brain. Vascular dementia is clogging of the blood vessels through the brain thus killing off neurons,
For those interested, I made a full transcript of this video. Hope this helps someone else out, especially those writing papers! I double checked everything, but please let me know if I missed anything.
"Dementia isn't technically a disease, but more of a way to describe a set of symptoms, like poor memory and difficulty learning new information, which can make it really hard to function independently. Usually dementia is caused by some sort of damage to the cells in the brain which can be caused by a variety of diseases. Alzheimer's disease, now referred to as Alzheimer disease is the most common cause of dementia. Alzheimer disease is considered a neurodegenerative disease meaning it causes the degeneration or loss of neurons in the brain particularly in the cortex. This, as you might expect, leads to the symptoms characteristic of dementia. although the cause of Alzheimer disease isn't completely understood, two major players that are often cited in its progression are plaques in tangles.
All right, so here we've got this cell membrane of a neuron in the brain. in the membrane you've got this molecule called amyloid precursor protein or APP. One end of this guy’s in the cell and the other end’s outside the cell. It's thought that this guy helps the neuron grow and repair itself after an injury. since APP’s a protein just like other proteins, it gets used and overtime it gets broken down and recycled. Normally, it gets chopped up by an enzyme called Alpha secretase and its buddy, Gamma secretase. This chopped up peptide is soluble and goes away and everything is all good. if another enzyme, beta secretase, teams up with gamma secretase instead then we've got a problem. This leftover fragment isn't soluble and creates a monomer called amyloid beta. These monomers tend to be chemically sticky and bond together just outside the neurons and form what are called beta amyloid plaques, these clumps of lots of these monomers. These plaques can potentially get between the neurons which can get in the way of neuron-to-neuron signaling. if the brain cells can't signal and relay information, then brain functions like memory can be seriously impaired. it's also thought that these plaques can start up an immune response and cause inflammation which might damage surrounding neurons.
Amyloid plaque can also deposit around blood vessels in the brain called amyloid angiopathy, which weakens the walls of the blood vessels and increases the risk of hemorrhage or rupture and blood loss. Here's an image of amyloid plaque on Histology. These clumps are buildups of beta amyloid and this is happening outside the cells. Another big part of Alzheimer disease are tangles, and these are actually found inside the cell as opposed to the beta amyloid plaques. Just like other cells, neurons are held together by their cytoskeleton which is partly made up of microtubules, these track like structures that essentially act like a minecart shipping nutrients and molecules along the length of the cell. A special protein called Tau makes sure that these tracks don't break apart, kind of like railway ties. Although again it's not completely understood, it's thought that the beta amyloid plaque buildup outside the neuron initiates pathways inside the neuron that lead to activation of kinase an enzyme that transfers phosphate groups to the Tau protein. The Tau protein then changes shape, stops supporting the microtubules, and clumps up with other Tau proteins and gets tangled and leads to the other characteristic finding of Alzheimer disease, neurofibrillary tangles.
Neurons with tangles in non-functioning microtubules can't signal as well and sometimes end up undergoing apoptosis, or programmed cell death. Here's an image of Histology showing these neurofibrillary tangles formed inside the neuron. As neurons die, large scale changes start to take place in the brain. For one, the brain atrophies, or shrinks, and the Gyri get narrower (which are the characteristic ridges of the brain). As those get narrower the Sulci, which are the groups between the Gyri, get wider. With atrophy the ventricles, or fluid filled cavities in the brain, get larger as well.
So, that's the pathophysiology part, but why does this happen in some people and not others? well Alzheimer disease can be split into two groups sporadic and familial. Sporadic is used to describe the late onset type where the exact cause isn't very well defined and is probably a combination of genetic and environmental risk factors. And sporadic accounts for the vast majority of cases. With sporadic Alzheimer's, the risk increases significantly with age affecting around 1% of people between ages 60-65 and 50% of people over the age of 85. In fact, a gene that's been identified as possibly contributing to an increased risk of Alzheimer disease is the e4 allele of apolipoprotein E gene or APOE e4. Researchers have shown that the risk of developing Alzheimer disease increases for patients that inherit one e4 allele and increases even more for patients who inherited two e4 alleles, one from each parent. Apolipoprotein E helps breakdown beta amyloid, but the E4 allele seems to be less effective than the other alleles like the APOE 2 allele, meaning patients are more likely to develop beta amyloid plaques.
Familial Alzheimer disease, on the other hand, is used to describe cases where some dominant gene was inherited that speeds up the progression of the disease. So, sometimes familial Alzheimer's disease is referred to as early-onset Alzheimer's. Familial accounts for about 5 to 10% of cases and could be caused by several gene mutations. First, mutations in the PSEN-1 or PSEN-2 genes on chromosome 14 or chromosome 1, respectively, had been linked to early-onset Alzheimer's. These genes encode for presenilin 1 and presenilin 2, both protein subunits of gamma secretase. Mutations in these PSEN-1 or PSEN-2 genes can change the location where gamma secretase chops APP, producing different length beta amyloid molecules, which seem to be better at clumping up and forming plaques.
Another known genetic cause of Alzheimer's is trisomy 21, or Down Syndrome, which involves an extra copy of chromosome 21. It turns out that the gene responsible for producing APP is located on chromosome 21, which means that people with Down Syndrome have an extra APP gene and presumably increased expression of APP, potentially increasing the amount of amyloid plaque buildup. For this reason, familial Alzheimer disease often progresses by age 40 in patients with Down Syndrome.
Symptoms of Alzheimer disease worsen as plaques and tangles buildup and damage to the neurons accumulates. In the early stages, symptoms might not even be detectable. As it progresses, though, patients lose short-term memory. Like, for example, they might not be able to remember what they had for breakfast that morning. They then progress to a loss of motor skills making things like eating difficult without help. Also language becomes affected making it more difficult to communicate. Eventually they lose long term memory, like forgetting the name of their spouse or even that they're married in the 1st place. And they progressively become more disoriented, which can be dangerous because they might wander from home and get lost.
In the late stages they become bedridden and the most common cause of death is actually infection, like pneumonia.
Diagnosis of Alzheimer disease is really tough because the only way to definitively show that a person had Alzheimer's is by performing a brain biopsy after autopsy. Usually a clinician will, therefore, make a diagnosis after excluding other causes of dementia. Currently there isn't any cure for Alzheimer disease. Some medications exist but the benefits are small and there haven't been any medications that clearly and definitively halt the progression of Alzheimer's."
I think i have alzheimer cuz i dont remember asking
@@kazrulgaymingIs that why Snape killed you?
@@SteveWoodyMusic couldnt remember
@@kazrulgayming LOL
Thank you very much!
Do you know how much I love you gus and how grateful I am. You are AMAZING !!!!
Wow, thank you! ❤️
Thank you for your precious help ! You have no idea how much you make it easier , May GOD bless you !
Alzheimer can be cured naturally. Contact @herbalistehi for cure and any other disease/virus.
this video is the best one I've come across explaining Alzheimer's . thank you so much!!
Wow, thank you, Alanna! 😊
I agree, but to understand this video, you must at least know ninth grade biology, which many people doesn't know. But still, great video, Keep it up
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This video really helped me for the boards
Thanks!
qas
the vision in the description is so cute, thank you for your efforts honestly🥺❤
Thank you 🥰
Great work team osmosis ❤aplausable job. U are giving education to lots of students across the world. 😇
I’m 70, alone and just been given this diagnosis. It is absolutely devastating particularly having to give up my job, my home and everything I worked for. I am devastated!.
Plzz belive in Jesus he is the only real god he can heal you and cahnge your life plzz only 1 time pray to him with whole your heart trust me I am only 17 and i have experienced how great he is and i am not doing this for relegious sake because jesus came for whole world and relegion and christians
God will heal you
Alzheimer can be cured naturally. Contact @herbalistehi for cure and any other disease/virus 100%
Thank you alotttt osmosis and your team man!! it's help me alot❤
Happy to hear that! 💕
I can't thank you enough, you helped me a lot! it's a talent to make a complicated subject so simple and interesting. THANK YOU
You've just made my exam more easier! Thank you. ✨
7:20 I'm in danger
Being diagnosed with Alzheimer's disease. has been a major loss of money and has caused major problems in my immune system,but when I came across Dr. Osaka on UA-cam Channel and he recommended his herbal medicine I got completely cured of Alzheimer's disease.
Thanks bro! Totally helped.
As I prepare for my upcoming practical test tomorrow.... Big thumbs up! :)
one of the best channel on youtube when it comes to medicine
The explanation is so great. I satisfied with it. Thanks a lot!
I had this topic to elaborate and was not able how to because all the causing factors ,NFT ,Tau are getting me confused ,now they r just superb cleared
I can’t find the proper words to thank u osmosis
THANK YOU
Most welcome! ❤️
Thank you so much❤ I'm using this for my seminar the mechanism of Alzheimer
God bless you good job ❤🙏🏻
Glad it was helpful! 💖
Highly thankful for this video.. 😊
Our pleasure! 😊
Best simplification ever!
Nice video of Alzheimer's disease.I understood Alzheimer's disease very well. Thank you for making this video.
Simple, Excellent job. Thanks
You are welcome!
Explained it way better than my lecturer
Im 12 my grandma does not remember who i am but some time she remembers me but then forgets 😥😪
treat for her as much as you can, she's got a limited time to enjoy life.
I am so sorry to read this. My grandfather says he remember me, just after I say who I am and what's my name, I think he do that because I'm the only one who come to see him, and don't wanna hurt my feelings cus he see that I'm crying, I trust that you will be fine
. When I see this post I remember Dr. Osemuahu. He really made me believe in him so much. by healing me months ago with his herbal treatment from Alzheimer disease. I really appreciate you very much and he is able to cure you from any sickness and he also cured my cousin from Ischemic heart disease thanks to him ...if you have any diseases let me know so I can link you up with him ..
Thank you so much, this is super helpful! As someone who is just beginning to get to grips with the neurobiology of Alzheimer's you''ve really helped a gal out!
Alzheimer can be cured naturally. Contact @herbalistehi for cure and any other disease/virus.
Thank you so much! So helpful, would you consider doing a video on Parkinson's Disease..?
Thank you! We plan to do that disease in the future. You can vote for upcoming videos by becoming a Patreon subscriber at www.patreon.com/osmosis
yes also a video on meningitis
This video is amazing. it made me understand this topic a lot easier, thanks for making it.
THANK YOU SO MUCH I WAS SO CONFUSED BUT THANKS TO YOU GUYS IM NOT ANYMORE
I also really like the drawings and the animation it was a big help for me to understand! really good job I hope you continue your great work!
Hat's off to you guys.. Thanks for such selfless work!
Nowadays.. I hit like button before seeing this awesome video's.
Thanks again. 😊
Please speak on the recent studies that do not support studies on current drugs that treat Alzheimer disease. Sounds like there was fraud
I FORGOT 💀
Very neat to learn all the points are hidden over hear ... It is more enough for students .... Thanks a lot osmosis 👍
thanks for these video's these build up my concepts clearly n help me a lot in understanding things which are difficult....thank you osmosis
After watching ur videos i always get cleared about the topic thankx
I feel like a great dr after seeing your videos
Thnx for the very helpful information I have an exam tomorrow and I feel like I'm more then ready now
Keep it up !
We hope your exam went well! If you haven’t yet checked out our educational platform we have a bunch of tools, including unreleased videos, quizzes, and flashcards to help you learn medicine. You can sign up for a free trial of Osmosis Prime here: bit.ly/2ut5ZEJ
Very clear, concise, and concrete. I looked at the First Aid book and everything said in this video and some correlated with the material. I will starting these videos more often to take my understanding and studying to another level. Thank you!!
I've just come across your channel. As a medical student this is a wonderful starting point. Thank you!
I keep forgetting stuff I did 2 SEC ago, but i still remeber things from long ago or 3 days ago
this soothed my visual learning brain, i wish i could find the words to show how much this helped me
Glad our video was able to help, Jessica! 🥰❤️🙏🏼
Alzheimer can be cured naturally. Contact @herbalistehi for cure and any other disease/virus 100%
Please write your sources i need them for my research 🙏
Thanks 😍
from Egypt ❤
I really appreciate the details you shared in this video. 👍👍👍
It made me clearer about what is happen with my mom's brain.🙏
Glad it was helpful! Keeping your mom and your family in our thoughts today. 🙏🏼
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I had no idea that I love vids like this.
Thank you then! 😊
The Best one i have ever seen. I have been studying it and found it very difficult to understand but this made that too easy for me.... Thanks Osmosis!!!!!!
Extremely well done.
dude these videos are so goood and short and awesome for reviewing the material especially if u r preping for boards like step 1
keep up the good work and God bless yall
+mody wattar Thank you!
Fantastic explanation!
Glad you think so! 💫 🥰 💖
Thankyou Very Much... Tomorrow is My paper of clinical Bio.chem.
Grazie! Bei disegni!
My dads grandma had this she lost her memory keep up the great work
I am trying the same.. I hope I can do more for psychology students. Good luck
That was the easiest and explicit explanation! Thank you 😊
If you're interested in research that looks at possible root causes for Alzheimer's, check out the work of Dr. Dale Bredesen. He had a 2018 study in the Journal of Alzheimers Disease & Parkinsonism. The study is titled: "Reversal of Cognitive Decline: 100 patients." It's fascinating stuff!
Best lecture
Vowww... Thank God I found this video! Too much simplified👍🏻
u guys are amazing!
VERy informative, and easily understood, thank you.Rhonda
Alzheimer can be cured naturally. Contact @herbalistehi for cure and any other disease/virus.
Even though I have trouble memorizing or difficult learning strategies or the stuff
I DO NOT HAVE DEMENTIA OK?
Thats nice.... end the explanation with no cure followed by a pause
Outstanding DEAR Sir ,Now completely understood....thanks
Great explanation of Alzheimer’s disease. Thank you!
Alzheimer can be cured naturally. Contact @herbalistehi for cure and any other disease/virus.
I feel this needs vision with more modern data. Specifically that plaque does not in fact play a rule in the disease like previously thought.
Just a quick edit - Short-term memory ISN'T remembering what you had for breakfast. Remembering recent events is still Long-Term Memory (Episodic), and the unability to do so is called anterograde amnesia (inability to form new memories). Short-Term Memory (also noted as Working Memory and sometimes used interchangeably) refers to the memory of the now - spanning back SECONDS, not hours - it is what helps you remember the beginning of your sentence, do mental calculations, remember a phone number being said to you as you type it up in your phone, etc. It's also what is impaired temporarily when someone's high on weed, for example.
But still, very helpful video! :)
So helpful.
Glad it was helpful, Isaias! 💕
You make me smarter everytime i watch one of these!
In nutshell..... Is the best presentation.. Thank you
excellent presentation.. thank you so much,, :)
Very useful video!! Would love one on Parkinsons and Huntingtons! Thank you
What an amazing channel. Super helpful. Thank you osmosis!
It must be the most effective thing to watch .thanks alot
This is really well done. I'd love to get an updated version with Bredesen's argument that APP is a dependence receptor, and the way it is cut is contingent on whether it finds its neurotrophic support as well as if there is enough trophic support throughout the brain.
This videos have superficial information and are mainly for basic introduction and visual overview!
@@jordan.d1475 I understand your perspective. Judging by the comments, there are a lot of medical workers in training watching this video to study for exams, so it would be great to expose them to new ideas about Alzheimer's since 2016. Also, there are a lot of people coming to this video to try to understand the disease of a loved one, and since Dale Bredesen has created the first program to reverse cognitive decline, I'd love for more people to be exposed to the one glimmer of hope we have.
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my great great great grandmother Nana Loudermilk had Alzheimer's disease.
F
plzz make more videoes about pharmacolgy too ,really want to give my fee to you guys
Pathophysiology of alzheimers was confusing everywhere but with your explanation i have found my answers.
Alzheimer can be cured naturally. Contact @herbalistehi for cure and any other disease/virus.
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Thank you, my professor explained this with the thickest incoherent accent I have ever heard, and could not understand a thing.
Happy to help, Linh! 😊
What software did you use to make your videos?? I want to know so that I can make one for school presentations.
We use Camtasia and Sketchbook. We also have an amazing team of artists.
Thank you bro you made me to take seminar easy way👏👏👏
I love you thank you so much you dont know how much this helps
Pleasure to help, Tamil! 😊
Being diagnosed with Alzheimer's disease. has been a major loss of money and has caused major problems in my immune system,but when I came across Dr. Osaka on UA-cam Channel and he recommended his herbal medicine I got completely cured of Alzheimer's disease.
Alzheimer can be cured naturally. Contact @herbalistehi for cure and any other disease/virus 100%
This is very easy to understand! Thank you !
Please create playlists. Thank you
This is very clearly explained - thank-you
Alzheimer can be cured naturally. Contact @herbalistehi for cure and any other disease/virus.
Dr berg video on this is helpful. Care for your liver.
Bless Osmosis you will be remembered and pass to the next gen ekip ekip 667🎉❤
Thank you! 😊
thank you so much for these helpful videos with perfect presentation