Inflammation is part of the immune system’s response to damage or infection. It is a very natural process that our bodies undergo when we come into harms way.
Researchers at the University of Queensland, have recently demonstrated something interesting about the inflammation associated with Parkinson’s: by inhibiting a very specific part of the inflammatory process, they can reduce the spread of Parkinson’s associated alpha synuclein pathology in models of PD.
And they have developed a drug – called MCC950 – that specifically targets that component of the inflammation process which they are now seeking to test in clinical trials.
In today’s post, we will discuss what inflammation is, review this new research, and consider what it could all mean for the Parkinson’s community.
Spot the unhealthy cell – exhibiting signs of stress (yellow). Source: Gettyimages
No silly preamble today – this is going to be a very long post, so we’re diving straight in:
When cells in your body are stressed or sick, they begin to release messenger proteins which inform the rest of your body that something is wrong.
When enough cells release these messenger proteins, it can cause inflammation.
What is inflammation?
Inflammation is a vital part of the immune system’s response to trouble. It is the body’s way of communicating to the immune system that something is wrong and activating it so that it can help deal with the situation.
By releasing the messenger proteins, injured/sick cells kick off a process that results in multiple types of immune cells entering the troubled area of the body and undertaking very specific tasks.
The inflammatory process. Source: Trainingcor
The strength of the immune response depends on the volume of the signal arising from those released messenger proteins.
And the level of messenger proteins being released partly depends on multi-protein structures called inflammasomes.
What are inflammasomes?
Researchers are building as ever increasing amount of evidence supporting the idea that as our bodies age, there is an accumulation of cells that cease to function normally. But rather than simply dying, these ‘non-functional’ cells shut down and enter a state which is refered to as ‘senescence‘.
And scientists have also discovered that these senescent cells are not completely dormant. They are still active, but their activity can be of a rather negative flavour. And new research from the
The good new is that a novel class of therapies are being developed to deal with senescent cells. These new drugs are called senolytics.
In today’s post, we will discuss what is meant by senescence, we will review the new data associated with Parkinson’s, and we will consider some of the interesting senolytic approaches that could be useful for PD.
This is not my living room… honest. Source: Youtube
Humans being are great collectors.
We may not all be hoarders – as in the image above – but everyone has extra baggage. Everybody has stuff they don’t need. And the ridiculous part of this equation is that some of that stuff is kept on despite the fact that it doesn’t even work properly any more.
The obvious question is:
Oh, and don’t get me wrong – I’m not talking about all that junk you have lying around in your house/shed.
No, I’m referring to all the senescent cells in your body.
Huh? What are senescent cells?
Numerous epidemiologic studies have indicated that coffee consumption reduces the risk of Parkinson’s disease. For a long time, efforts have been made to determine what the magic ingredient in this popular beverage is. Many people have speculated that the stimulant caffeine is the critical active ingredient in this neuroprotective effect.
New research, however, suggests that this may not be the case.
Today’s post will review recently published results suggesting that Quercetin (and not caffeine) is the neuroprotective component in coffee.
Kaldi the goat herder. Source: CoffeeCrossroads
Legend has it that in 800AD, an Ethiopian goat herder called Kaldi noticed that his animals were “dancing” after eating some berries from a tree that he did not recognise. Fascinated by the happy behaviour of his goats, Kaldi naturally decided to eat the berries for himself and he subsequently became “the happiest herder in happy Arabia”.
This amusing encounter was apparently how humans discovered coffee. It is most likely a fiction as the earliest credible accounts of coffee-consumption emerge from the 15th century in the Sufi shrines of Yemen, but since then coffee has gone on to become one of the most popular drinks in the world.
Stupid question: what exactly is coffee?
For a person who doesn’t drink coffee (like myself), this is actually a really interesting question. Coffee is a beverage made from ground up roasted beans, which are the seeds of berries from the Coffea plant. These are the berries:
Coffea berries. Source: About.me
And these are the beans (unroasted):
Unroasted Coffee beans. Source: Kopiholic
There are basically two types of coffee beans: Arabica and Robusta.
Approximately 70 percent of the coffee beans we use are Arabica. Surprisingly, the less popular Robusta actually has twice as much caffeine as Arabica. And caffeine is the stimulant that rewards people for drinking this beverage.
Caffeine is also the chemical that has long been thought to have positive effects on Parkinson’s disease, possibly even reducing the risk of the condition (more on that below).
Fancy a cuppa? Source: Science-All
What does coffee have to do with Parkinson’s disease?
We have previously discussed the enormous contribution that the Honolulu Heart Study has made to our understanding of Parkinson’s disease (click here to read that post). Many of the earliest associations with the condition were found in that large epidemiologic study. One of those findings was that the consumption of coffee reduced one’s risk of developing Parkinson’s disease.
Title: Association of coffee and caffeine intake with the risk of Parkinson disease.
Authors: Ross GW, Abbott RD, Petrovitch H, Morens DM, Grandinetti A, Tung KH, Tanner CM, Masaki KH, Blanchette PL, Curb JD, Popper JS, White LR.
Journal: JAMA. 2000 May 24-31;283(20):2674-9.
PMID: 10819950 (This article is OPEN ACCESS if you would like to read it)
The researchers behind this article analysed the data from the Honolulu Heart Study – an epidemiological study of 8,006 “non-institutionalized men of Japanese ancestry, born 1900-1919, resident on the island of Oahu” – and found that the age-adjusted incidence of Parkinson’s disease declined consistently with increased amounts of coffee intake (from 10.4 per 10,000 person-years in men who drank no coffee to 1.9 per 10,000 person-years in men who drank at least 28 oz/d). This and other findings in their analysis indicated that higher coffee (and caffeine) intake is associated with a significantly lower incidence of Parkinson’s disease.
Subsequent studies have replicated this association, and several have demonstrated the neuroprotective effects of caffeine (click here for a review on this topic).
So what new data has been published?
This is Prof Patrick and Prof Edith McGeer:
Prof Patrick and Prof Edith McGeer. Source: Mcgeerandassociates
This husband and wife team of scientists are well recognised figures within the Parkinson’s disease research work, having produced many seminal scientific reports. Patrick is a particularly interesting character having played basketball for Canada in the 1948 Olympics and then a politician in the British Columbia legislature (1962-1986).
They are also authors on the article we are going to review today:
Title: Quercetin, not caffeine, is a major neuroprotective component in coffee.
Authors: Lee M, McGeer EG, McGeer PL.
Journal: Neurobiol Aging. 2016 Jul 5;46:113-123.
As we said above, for the longest time people have believed that caffeine was the active ingredient in the miraculous ability of coffee to reduce the risk of Parkinson’s disease. The researchers who published this report were particularly interested in the neuroprotective role for coffee in Parkinson’s disease and they decided to break coffee down into some of its basic components. Specifically:
- Chlorogenic acids (CGAs)
They tested each of these coffee components on cells (grown in petri dishes) that had been exposed to a toxin, and then assessed cell survival. Curiously, although caffeine did exhibit neuroprotective effects on the cells, it was beaten by the far superior protective effects of quercetin.
What is quercetin?
Quercetin is a flavonoid (a type of plant pigment) that is found in many fruits, vegetables, leaves and grains. Flavonoids are potent antioxidants. Antioxidants scavenge particles (called free radicals) in the body which can damage cell membranes, affect DNA, and even cause cell death. Antioxidants neutralize these free radicals. (For more on flavonoids – click here).
What does this mean?
The results are very interesting, especially if they provide us with a new potential target for therapeutic drug development. It also raises the age-old idea of antioxidants being potentially useful in the treatment of Parkinson’s disease (the previous history of this therapeutic approach has been disappointing – click here to read more on this).
But before you rush out and load up on quercetin, there are a few things to consider:
Quercetin is generally considered pretty safe. Fruits and vegetables are the primary dietary sources of quercetin, particularly citrus fruits, apples, onions, parsley, sage, tea, and red wine.
That said: excessive use of quercetin can have side effects, which may include headache and upset stomach. Very high doses of quercetin can cause damage to the kidneys (doses greater than 1 g per day), and regular periodic breaks from taking quercetin is advised. Importantly, pregnant women, breastfeeding women, and people with kidney disease should avoid quercetin.
EDITOR’S NOTE: If you are considering supplementing your diet with quercetin (or any other potential therapeutic agents) please firstly discuss this change of lifestyle with your medical physician. Information provided here can under no circumstances be considered medical advice.
Having said that we shall keep an eye out for any new research of quercetin and Parkinson’s disease, and report it here.
The banner for today’s post was sourced from Phoxpopmagazine