Monday, 24 April 2017

More Media Nonsense...Not the Cause of Multiple Sclerosis, but maybe a pathway to damage

There is a story going round the media that the cause of multiple sclerosis has been found.  You can read the paper as it is open access and was published at the end of January.

I have been accused of being HDAD with the post's today...but ProfG has asked that we comment on this story ASAP.

Is this the cause of MS? I would say absolutely not.

It describes a way that nerves can die following inflammation.

If you want it put in a simple way it is a bit like Cluedo. (Clue).  We know that nerves get damaged and die due to inflammation.

The room. It is in the active lesions
The m**der weapon (if I spell this word if makes us an adult site)
The results of the study kind of gives us a weapon or a pathway 
for the weapon to do its damage.

It does not give us the murderer. (the cause of MS). Is it the Rev or Professor Plumb we still don't know.


Therefore, more media hype as ever and opportunist thing for MS Awareness Week....It makes me very aware that the media are so rubbish in science reporting...and I hate to say it we (scientists) help them by not putting out foot down.


Background: Endoplasmic reticulum (ER) stress is a hallmark of neurodegenerative diseases such as multiple sclerosis (MS). However, this physiological mechanism has multiple manifestations that range from impaired clearance of unfolded proteins to altered mitochondrial dynamics and apoptosis. While connections between the triggering of the unfolded protein response (UPR) and downstream mitochondrial dysfunction are poorly understood, the membranous contacts between the ER and mitochondria, called the mitochondria-associated membrane (MAM), could provide a functional link between these two mechanisms. Therefore, we investigated whether the guanosine triphosphatase (GTPase) Rab32, a known regulator of the MAM, mitochondrial dynamics, and apoptosis, could be associated with ER stress as well as mitochondrial dysfunction. 
Methods: We assessed Rab32 expression in MS patient and experimental autoimmune encephalomyelitis (EAE) tissue, via observation of mitochondria in primary neurons and via monitoring of survival of neuronal cells upon increased Rab32 expression. Results: We found that the induction of Rab32 and other MAM proteins correlates with ER stress proteins in MS brain, as well as in EAE, and occurs in multiple central nervous system (CNS) cell types. We identify Rab32, known to increase in response to acute brain inflammation, as a novel unfolded protein response (UPR) target. High Rab32 expression shortens neurite length, alters mitochondria morphology, and accelerates apoptosis/necroptosis of human primary neurons and cell lines. 
Conclusions: ER stress is strongly associated with Rab32 upregulation in the progression of MS, leading to mitochondrial dysfunction and neuronal death.

So what is all this about, I didn't report it previously as to explain means we have to go through a few things first.

The endoplasmic reticulum (ER) is interconnected network of flattened, membrane-enclosed sacs or tube-like structures known as cisternae. The membranes of the ER are continuous with the outer nuclear membrane. There are two types of endoplasmic reticulum: rough and smooth. The outer (cytosolic) face of the rough endoplasmic reticulum is studded with ribosomes that are the sites of protein synthesis. The smooth endoplasmic reticulum lacks ribosomes and functions in lipid manufacture and metabolism.

The mitochondria is the power house of the cell and it is where the energy for a cell is made.

The brain uses about 20% of the bodies energy, to maintain nerve traffic and we know that there are a number of problems with mitochondria in MS as a cause of downstream problems and as a consequence of upstream problems. 

Sometimes the mitochondia becomes in close proximity to the endoplasmic reticulum and this has been termed mitochondria-associated membrane (MAM) and this is a mechanism which results from communication between  endoplasmic reticulum and mitochondria, this linkage consist of some proteins and a region on ER containing lipid making protein connected reversibly to mitochondria

Mitochondria associated membranes are involved in the transport of calcium from the endoplamsmic reticulum to mitochondria. This interaction is important for rapid uptake of calcium by mitochondria through  ion channels, which are located at the outer mitochondrial membrane (OMM). This transport is regulated with chaperones  (Proteins that affect protein folding so that they are made in the correct shape. Last week we heard how misofolded proteins may be important in neurodegenerative diseases) and regulatory proteins which control the formation of the ER–mitochondria junction. 

This calcium is part of normal function but if a cell accumulates too much calcium in the for of electrically charged calcium ions, it triggers cell suicide, which is a process known as apoptosis The main cellular calcium ion store is in the endoplasmic reticulum. 

Release of calcium ions within the diseased cell can enter the mitochondria via the MAM gateway and can trigger cell death.

RAS associated binding (Rab) proteins and protein that regulate steps in the traffic of substances across membrane and one them is is called Rab32.

What has been found in this study is that during inflammation of the brain there is a increase in the production of Rab32, so it means there can be extra membrane traffic. In this study they found that there was an increase in the Rab32 protein in the mitochondria during multiple sclerosis an was highest in places of active inflammation. 

This was associated with the chaperones and also the formation of MAM proteins so that in active lesions the mitochondria appeared to be fusing with the endoplasmic reticulum. This what could be seen in animals with neurodegeneration was also seen in humans. They found the rab32 is swollen axons suggesting that they were dystrophic and on their way to damage and destruction.

It was also found in microglia within the active lesions and even in blood vessels, suggesting that this may occur inresponse to something within the local environment

Depletion of Rab32 from nerve cells didn't have much of an affect, but when they put Rab32 into ther nerve it caused damage to the mitochondria and nerve death, this occured by apoptosis (cell suicide where the cell contents aren't liberated) and Necroptosis is a programmed form of necrosis (whether the cell contents are liberated), or inflammatory cell death.  Necrosis is associated with unprogrammed cell death resulting from cellular damage or infiltration by pathogens, in contrast to orderly, programmed cell death via apoptosis.

Rab32 as a new marker for active and chronic inflammatory lesions of the CNS in MS whose endoplasmic stress (leading to increases in calcium levels)-triggered transcription leads to altered mitochondrial dynamics and neuronal cell death. 

So this is nice work showing us how nerves may die during active inflammation, however it is hardly the cause of MS. 

That this marker occurs in other cells suggests that a similar response is occuring other cells in response to the stimulus possibler hypoxia (lack of oxygen) or maybe a cytokine or some other toxic substance. However as to cause MS, I think more non-sense in the media.

Can this be a treatment, so if we block Rab32 in nerves does it spare them from death. We have shown that is you block Caspase which is a death effector mechanism for apoptosis it may be possible to save the nerves. So it may give rise to a treatment. Further work, is needed but I can see the work in the Rab32 knockout already. 

Rapid Guest post

Don Mahad from the University of Edinburgh, via AAN ,Agrees


"Hi 
Doing a piece for BBC radio Scotland just now. In Boston at AAN. Makes a contribution to existing knowledge on mechanisms of tissue damage but not the cause of MS
Happy to write more if you wish".

23 comments:

  1. Incidentally Team G reported on a related area to this a little while back. This latest report above adds to the findings that mitochondrial dysfunction is a factor in neuronal degeneration.
    https://www.ncbi.nlm.nih.gov/pubmed/26679998

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  2. Seems like rab32 can be upregulated by hep c (https://www.ncbi.nlm.nih.gov/m/pubmed/27852857/) is the same true of ebv?

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    Replies
    1. I dont know but it is also involved in control of bacteria

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  3. So was this a study of brain tissue samples or living MS patients?

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    1. It was brain tissue post mortem.
      I have looked at our data of progressive mice and the Rab32 protein in about 5 times higher than normal.

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  4. Hence why we left it off our publishing docket. Will echo your article.

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    1. It is MS awareness week and the press offices are the ones who should take the blame/responsibility.

      News agencies pick up what is put out to the press office from the universities, but when we are adding cure/and cause to our work we are simplyly hyping and doing the community no favours.
      What are the hash tags that people with MS use for their twitter feeds, we have been using #MSrearch but if we want to get the message out like we did today what should we use?

      Delete
    2. Hi MD, tags #multiplesclerosis #ms #msnews #mswarrior #mswarriors #disability #disabled #chronicillness #msfriends

      Twitter content is quite transient along time. It'd be "nice" if the patient associations would react and send out such information(s) as they tend have best case visibility on social media.

      ---

      I've saw this happen numerous times now w/ stem cells and other news. It doesnt surprise me for mainstream media just echo off press release. Does surprise me for medical media to use the term "Cure" or "Cause Found."

      I suppose in a way, it also exemplifies a part of the "good" of 90% of MS patients not being engaged well online globally.

      ----

      In as far as press offices taking responsibility thats unlikely. Traffic = page views, page views sell advertising.

      I imagine the same thing happens towards other chronic diseases and then some.

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    3. problem having so many hashtags that you can't write a tweet

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  5. Another thirty years and another thirty percent will end up in wheelchairs before anything comes of this.

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    Replies
    1. We are optimising out mitochondrial targeting compounds as we speak:-)

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  6. Is there a way to measure Rab32 protein levels in living MS patients?

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  7. HDAD? What? My, I dislike the use of acronyms with abandon, and hashtags / overuse of Twitter, and bad or American spelling. And poor grammar. Off to read about something else, somewhere else. In a real book with pages. For the sake of my sanity.

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    1. ADHD thought i'd changed that.
      Good to see we are tolerant of disabilities :-) Dyslexia.

      With corporate sponsorship that can all be fixed with a curator

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    2. HDAD, ADHD or OCD, let's call the whole thing off ;-)

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  8. 'With corporate sponsorship that can all be fixed with a curator' ...

    ...or a volunteer?

    Someone reading this may be interested in helping out with that, you could ask around. You might find a student, pwms or a retiree who may be willing to give some time to the blog.





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  9. Great! I guess Donald Trump is not completely mad when he talks about fake news. Don't these so called jouranlists realise giving false hope is more detrimental than no hope!

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  10. Would like to hear thoughts about Mito-Q as a way to support mitochondria and perhaps delay neurodegeneration.

    (Is Mito-Q a superpowered CoQ10 or is that hype?)

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  11. Upon seeing this article, I am happy to answer some of your questions. While these news articles have not reported our findings appropriately, our study shows Rab32 is a protein that causes mitochondrial dysfunction upon ER stress. It therefore connects ER stress to mitochondrial problems, which could then cause activation of the immune system. Feel free to contact me, it's always a good idea to ask at the source! Thomas.Simmen@ualberta.ca

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    Replies
    1. Maybe ask why your co-author in UK went along with the media hype. According to the UK media the source was Paul Eggleton, and I suspect you were tucked up in bed whilst the story was circulating in Europe.

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    2. Always a good idea to check the press release from your colleagues for approval before it's launched ;-)
      http://www.exeter.ac.uk/news/research/title_578807_en.html

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