In a recent reply post to forum member Parkie13 (Mary) I was discussing the chemokine Interleukin-8 (IL-8) and its relationship to PD and Multiple Sclerosis(MS) which I had only recently read about myself. The conversation got going because the post was discussing the possibility that MS may be caused by a virus and that in a similar line of thinking, is there a possibility that PD could potentially be caused by a virus or other pathogen? After doing some reading on this idea, I decided to do a post with a little more detail than the reply that I wrote to Mary and try and expand on the role of IL-8 in PD and find ideas on how to potentially inhibit or antagonize IL-8 in an effort to reduce its very negative effects in promoting neuroinflammation and consequently neurodegeneration in PD since it is seldom mentioned or discussed, if at all, in regards to PD even though it is clearly "a very major player" in the disease process! I have not seen one post on this forum discussing it, but it should definitely be a target for therapy in PD once you read about its role!
From what I have read so far, the chemokine IL-8 is part of the inflammatory process in both PD and MS, but It does not have direct inflammatory qualities itself, but rather recruits neutrophils which ultimately call upon other inflammatory mediators such as NF Kappa b, tnf alpha and inflammatory cytokines such as IL-1, IL-6 and IL-17 which are all known to be active in PD and MS based on many studies about the inflammatory cascade process with both diseases. The following abstract clearly illustrates that IL-8 is low in the serum of PWP.
ncbi.nlm.nih.gov/pubmed/270...
Interestingly, in serum testing of PD and MS patients it is shown that IL-8 levels are actually lower than comparable control groups. At first glance this looks like a good thing since less IL-8 likely means less neutrophils and consequently less inflammatory mediators and less of the damage that they are known to cause when they are chronically activated as they are in PD and MS. Upon closer inspection it turns out that while serum levels of IL-8 are lower, the levels in the brain /cerebrospinal fluid (CSF) compartment are definitely very elevated! As shown in the following study, by as much as 220% or more in PWP! This is more than a little significant and this compartment is where much of the damage is done in both MS and PD! Here is a link to a study that shows that IL-8 is definitely at very elevated levels in the CSF of PD and AD patients also! :
ncbi.nlm.nih.gov/pmc/articl...
The following study clearly suggests that IL-8 is a very major player in the disease process of PD and a definite potential target in the CSF! Here is a direct quote from this study below :
' PD and HC subjects showed significantly different relationships between CSF Aβ proteins and α-synuclein and specific inflammatory factors, and CSF IFNγ and serum IL-8 positively correlated with clinical measures of PD.'
ncbi.nlm.nih.gov/pmc/articl...
Here is a chart from the above study that illustrates some of the inflammatory mediators in serum and CSF of PWP :
Table 1
CSF TNF, CRP, IL-8, IL-6, α-synuclein, and Aβ levels were disrupted in PD versus HC
Quadratic effectHCPD
Serum analyteF statisticsp valueF statisticsp value
TNFF (1,5) = 0.060.82F (1,11) = 0.020.89
IFNγF (1,5) = 0.480.52F (1,11) = 1.160.31
NGALF (1,5) = 2.240.19F (1,11) = 1.370.27
CRPF (1,5) = 0.090.78F (1,11) = 3.620.08
IL-6F (1,5) = 5.370.07F (1,11) = 0.100.76
IL-8F (1,5) = 0.110.76F (1,11) = 2.880.12
CSF AnalyteF statisticsp valueF statisticsp value
TNFF (1,5) = 5.390.07F (1,10) = 7.470.02
IFNγF (1,5) = 0.000.99F (1,10) = 1.240.29
NGALF (1,5) = 0.160.71F (1,10) = 0.900.37
CRPF (1,5) = 1.670.25F (1,10) = 6.510.03
IL-6F (1,5) = 15.000.01F (1,10) = 2.970.12
IL-8F (1,5) = 1.280.31F (1,10) = 8.450.02
α-synucleinF (1,5) = 3.890.11F (1,11) = 6.020.03
Aβ40F (1,5) = 26.360.004F (1,11) = 8.190.02
Aβ42F (1,5) = 5.600.06F (1,11) = 11.600.006
Also of interest as regards IL-8 is that "thiamine deficiency" can cause elevation of IL-8 according to the following study!
ncbi.nlm.nih.gov/pmc/articl...
Since IL-8 is so active in the CSF of MS and PD and is at such significantly elevated levels it is possible that researchers at some point may consider the chemokine IL-8 a potential target in the treatment of either disease and expand on the current limited studies. Since it is the IL-8 in the CSF that would likely be targeted, it would be necessary to find molecules that are capable of passing through the blood brain barrier (BBB) and this is a bit of a problem because the BBB is supposed to keep many molecules out. Even if you have a molecule that is capable of crossing the BBB, that molecule will also have to have the ability to antagonize or inhibit IL-8 once it crosses the BBB and again this adds a further degree of difficulty in locating such a molecule.Such a molecule would also have to have a very good safety profile since it will be active in the brain/CSF and this adds a further degree of difficulty in trying to locate such a molecule.
So any candidate molecule will need to have the ability to cross the BBB in amounts sufficient enough to be capable of interacting with the chemokine IL-8 effectively, this molecule will also be required to have a very good safety profile so it does not do damage to brain cells, it must be easily available to the masses and it has to be able to antagonize or inhibit the target, IL-8. Ideally, this molecule will not require two decades of testing to establish its safety for the intended purpose of targeting IL-8 in the brain/CSF. Lastly, this molecule will hopefully not be so expensive as to make it too cost prohibitive to be a practical treatment option for MS and PD patients.
With those criteria established, the search for such a molecule or molecules begins. On this forum we frequently discuss magnesium in many forms for different uses by PWP to help alleviate PD symptoms and medication symptoms. Many members report good effects from these multiple forms of magnesium including a topically applied form called magnesium chloride oil or mag oil (MO) which has shown benefit for rapid relief of muscle cramps and tight muscles and pains of various origins and causes. We also talk about three specific forms of magnesium that have shown the ability to cross the BBB better than other forms of magnesium so far.
Three forms of magnesium that have shown the ability to effectively cross the BBB are Magnesium Aspartate which has shown the ability to rapidly cross the BBB as well as the ability to be rapidly taken up by other areas of the body. The second form of magnesium that is purported to be able to cross the BBB is Magnesium L Threonate and it is sold almost as a specialty form that is able to cross the BBB, but human studies are not its strong suit. The third form of magnesium that has shown itself to be able to cross the BBB is Magnesium Taurate. This third form of magnesium contains taurine and as has been discussed previously on the forum. Taurine is also considered to be helpful in PD and has some neuroprotective qualities, but also important is that taurine can cross the BBB and inhibit IL-8. So these are molecules which all have a very good safety profile, can cross the BBB, have been around for quite awhile, are relatively inexpensive, are easily attainable, have multiple other health potential, are often low, insufficient or deficient in humans and they all antagonize or inhibit the chemokine IL-8! Another molecule with the proven ability to cross the BBB, has a very good safety profile, is relatively inexpensive, has already shown benefit in some PWP, is readily available in multiple forms and inhibits or antagonizes IL-8 is our very well known Thiamine HCL!
Another popular supplement that has shown potential to cross the BBB and inhibit IL-8 is Pine Bark Extract (PBE) of which there is a patented form that sells at a substantially higher price than other pine bark extracts. Many studies have touted the health benefits of PBE and it too has a very good safety profile. The unpatented forms of PBE are readily available and relatively inexpensive. For those of you who are familiar with PBE, you are also probably aware that Grape Seed Extract (GSE), is thought to have very similar effects to PBE and in this case, GSE has similarities in that it is able to cross the BBB and inhibit IL-8. GSE is not to be confused with Grapefruit Seed Extract, which is of course derived from grapefruit. Like PBE, GSE has also shown neuroprotective effects.
One supplement, though having an as yet undiscovered method of action that has shown the ability to lower the gene expression of IL-8 are probiotics as outlined in the following study :
ams.ac.ir/AIM/NEWPUB/18/21/...
A supplement that I often describe as "one of my favorite supplements" and discuss frequently on this forum, melatonin, is already established for its ability to cross the BBB and this is one way it is able to provide neuroprotection in humans and animals. Melatonin has a very good safety profile, is readily available in the US over the counter, is very inexpensive, is sometimes prescribed by doctors for various reasons, is naturally produced in the body, is a highly potent antioxidant on its own, but is also capable of reducing and recycling other antioxidants and even more importantly increases the bodies own highly potent antioxidants such as catalase, glutathione and super oxide dismutase. Very importantly, melatonin is a known IL-8 inhibitor! Here is an abstract that shows that melatonin inhibits IL-8 and other inflammatory mediators that are known to be active in PD :
ncbi.nlm.nih.gov/pubmed/219...
The following abstract shows that melatonin is able to gain entry and effect repair in the brain and actually can repair or protect the BBB against damage!
ncbi.nlm.nih.gov/pubmed/280...
The fact that we have many melatonin receptors in multiple locations throughout the body illustrates that the human body has uses for melatonin of which we are still learning about. Melatonin has shown many health benefits in humans one of which is its anticarcinogenic effects in certain cancers that it has been tested for in humans. Melatonin also has protective effects in the major organs including the brain, heart, lungs, liver kidneys, skin and eyes! Melatonin can also help repair brain injury from stroke. Well, I did say it was one of my favorite supplements didn't I !
Lastly, another supplement that we have discussed often on the forum and I have previously written an extensive post about its effects in PWP, vitamin D. Yes, beyond all of the positives I wrote about it as it relates to PD, it also meets the criteria for this post! Vitamin D metabolites cross the BBB and can also help protect the BBB against damage, has a very good safety profile, is generally deficient or insufficient in PWP, is inexpensive, is readily available, is some times prescribed by doctors, is easy to take, has shown itself to have multiple potential health benefits and of course happens to be an IL-8 inhibitor as well as an inhibitor of other inflammatory mediators typically seen at elevated levels in PD as outlined in the following study.
ncbi.nlm.nih.gov/pmc/articl...
I think that going after IL-8 which is higher up in the PD and MS inflammatory cascade can be effective because by doing that, it can prevent or significantly lessen the chances for the inflammatory mediators lower in the cascade from ever becoming activated in the first place, as they can be very damaging! While it would be crazy to try and block IL-8, I believe that the majority of these anti- IL-8 supplements are relatively weak inhibitors of IL-8, but I believe the right combination of these supplements, may be just strong enough to try and return the chemokine IL-8 closer to its native levels as seen in control groups which may be just enough inhibition to very significantly limit neutrophil activation and consequently a very meaningful reduction of the inflammatory mediators below IL-8 in the inflammatory cascade that is seen in PD and MS.
As a side note related to previous discussions on the forum regarding reports of the common antibiotic Doxycycline being possibly helpful at reducing PD symptoms, doxy happens to be an IL-8 inhibitor, it crosses the blood brain barrier and can perform its antibiotic actions there also!
Given all of the above, it appears that this forum, has been on a very good track in terms of finding things that may be helpful for PWP and possibly to a degree, higher than any of us may have previously thought or knew! Just look at these nine supplements and how often they have been discussed on the forum and now we know that they all have two other very important activities of crossing the BBB and inhibiting IL-8!
I'm sure there are other molecules like these that may qualify for the proposed purpose, but these nine seem like an excellent starting point and now that we know that the chemokine IL-8 may be a potential target in PD and MS or at least it should be, we can continue the search for other potential molecules which may show promise in their abilities to inhibit the very inflammatory IL-8 chemokine in the brain/CSF!
Regarding the idea that MS or PD may in some cases, have an as yet undiscovered viral or other pathogenic component as a driving force, none has yet been discovered and until such a pathogen might be discovered, you can not just start randomly throwing antiviral or antibacterial meds at PD or MS without knowing which antiviral or antibiotic might be the correct one to use. If such an avenue were to be pursued in a laboratory setting, one possible option would be to consider using colloidal silver nanoparticles (AgNPs) which are already known to cross the BBB, have a very good safety profile, are readily available over the counter, are relatively inexpensive, have the ability to neutralize a huge number of pathogens of both bacterial and viral origin and is relatively gentle to normal human cells while showing very good potency against hundreds of pathogens including some fungus and parasitic pathogens. One difference or advantage with AgNPs is that it can be given without knowing what the potential pathogen is. It either neutralizes it or it doesn't, but it is not likely to do any significant damage to normal cells at the dosing levels required to neutralize most viral and bacterial pathogens it has been tested against. As far as current testing of AgNPs and the brain, there are only PD mouse model studies so far and those show that AgNPs have antiinflammatory effects in the brain because AgNPs aid in the synthesis of the potent antiinflammatory gas signaling molecule, Hydrogen Sulfide (H2S). H2S was previously thought to be toxic at relatively low levels, but has since been found to be potently antiinflammatory at the right levels as produced in the body and because this H2S is being produced in the brain, it demonstrates its effects right there and it is well established that inflammation in the brain is a major driving force in both PD and MS. Here is a link to a mouse PD model study using silver nanoparticles to good effect :
ncbi.nlm.nih.gov/pmc/articl...
I am not suggesting that anyone try any of the above, I would just like you to open your mind further to the possibilities of looking at previously undiscussed options in fighting certain inflammatory aspects of PD! These inflammatory aspects of PD also give rise to reactive oxygen species, oxidative stress and other radicals which all feed off of each other in a vicious cycle that needs to be reduced, controlled or broken in order to interrupt the disease process.
Art
I will list additional supplements that show the potential to inhibit IL-8 and are able to cross the BBB here for future reference. The first addition is Niacin by forum member Gio!
Member's list of IL-8 inhibitors that are purported to cross the BBB :
1. Niacin - Member Gio contributed this one along with study in his post above.
2. Icariin a derivative of the herb Horny Goat Weed. Forum member LAJ12345 including mentioning symptom benefit very early on after starting her husband on it.
3. Sildenafil - This common prescription med was suggested by member bone60
4. Curcumin derived from the herb Turmeric and should come as no surprise! Art
5. Carnosine - Again, this one from LAJ12345 with possible synergy with Icariin.
6. L-Theanine - Used for relaxation, stress relief and anxiety among other benefits. Art
7. EGCG - From tea crosses the BBB and inhibits IL-8, IL-6 & TNF alpha. Art
8. Baicalin - Derived from Scutellaria Baicalensis and meets the criteria. silverstrov
9. Boswellia Serrata (BS) - In all of its forms is an inhibitor of IL-8 and crosses the BBB. Other forms include AKBA which is considered more potent than standard extract. A more potent form of Boswellia is called Apres Flex but is harder to find. BS is a potent antiinflammatory and is often used in glucosamine multi supplements for its pain relieving effects. Some refer to BS as frankincense, but that is actually a more specific form of BS. Art
10. Hesperidin / Hesperitin- from citrus fruit inner peel. Antioxidant, Antiinflammatory and antidiabetic. Anti-psoriasis. Art
11. Fisetin - This one meets the criteria to be on this list and was contributed by forum member JerMan22!
12. Selenium crosses the blood brain barrier and inhibits IL-8. Art