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Question: People are less likely to develop Alzheimer's if they are happy, and 60 percent less likely to develop the disease if they drink coffee. Coffee gives a caffeine high. The effects on the hippocampus are similiar to that of depression. Is it possible that Alzheimer's is a form of depression or vice versa?
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Scarlett commented on :
Thank you again 🙂 @helen that was quite eye-opening and informative. It’s quite amazing how extensive the brain is, when it hardly takes up much space. I really hope the cause and cure is discovered soon (my grandma had alzheimer’s, but she wasn’t ever really unhappy) Does the caffeine help fight against plaques and tangles with the chemical reaction it causes to take place?
Helen commented on :
Hi Scarlett,
I’m really sorry to hear that your Grandma developed Alzheimer’s. It’s a horrible disease, and I also really hope the cause/cure can be found soon. You should know that there’s a huge number of laboratories and companies out there devoting resources to solving this exact problem, so it will happen eventually. Your question about caffeine and the plaques is another excellent one, and to be honest I don’t know much about the effects of caffeine on protein turnover when plaques (or ‘aggregates’) form. I can tell you that caffeine has been shown to increase the natural turnover of ‘normal’ proteins, so for example in sport science it’s known that athletes who consume a small amount of caffeine after an intense training session (where proteins in their muscles get damaged) recover more quickly than if they don’t consume caffeine.
Let’s talk about the plaques in the brain which are the hallmark of Alzheimer’s. There are other diseases which are caused when proteins that aren’t folded properly, or that have accidentally ended up in the wrong part of the cell, start to clump together and form these tangled, sticky aggregations. Parkinson’s disease is an example, also ALS (amyloid lateral schlerosis – remember the ice bucket challenge??). All of our cells are producing proteins, and sometimes those proteins get folded into the wrong shape, or get directed to the wrong place, but we have clever mechanisms in our cells to detect these ‘wrong’ proteins and recycle them. Cells have tiny machines called ‘chaperones’ which attach to a faulty protein and either re-fold them properly or guide them to the part of the cell where they will be broken down back into the amino acids they were built from. So, when this detection and repair mechanism breaks down, that’s when faulty proteins don’t get dealt with, and so they accumulate, causing more and more toxicity to the cell. Usually cells will realise that they are starting to experience this toxicity and they will launch something called a ‘stress response’ and start producing more of those chaperones to clear away the aggregates, but in these diseases, for some reason the cells don’t seem to realise they’re under any stress, possibly because the diseases develop over such a long period of time. In my company, we’re working on a treatment for this kind of accumulation of aggregated proteins. The treatment works by stimulating the cells to produce more of those chaperone proteins, or in other words, by stimulating a stress response in cells which have been under-reacting to stress. We have seen lots of positive results in cells and in animal models for a couple of different protein aggregation diseases, but the next stage in developing any medicine is to do a carefully controlled clinical trial in patients, and this takes a long time, and costs huge amounts of money. That’s where we’re at right now, trying to test this medicine in clinical trials. Then, if the results look positive, we will have to apply to the authorities to get permission to market the drug. At that stage, even if we think the results are conclusive, the regulatory authority could still reject the application and not allow us to make the drug available. It’s an extremely long, complicated and expensive process, but we’re working on it, and so are many others with drugs which work in different ways, so there’s lots to be hopeful for!