Olive oil and Her2 downregulation - question for the propellerheads
 

Hi all,

The recent spate of new information and posts on our ever popular olive oil threads brings up a question for me.

The way I am reading this, the active component in olive oil (oleic acid) downregulates Her2 overexpression, or the number of her2 receptors on the cell. It has been shown to be synergistic with Herceptin, which makes sense if part of the action of Herceptin is to inhibit the growth signals by blocking the receptor. It would follow (in my non technical mind) that if oleic acid "downregulates" Her2 by the same mechanism or some other mechanism that reduces the number of available Her2 proteins on the cell, that would be a good thing as it would, like Herceptin, reduce the amount of growth signalling through the Her2.

How am I doing so far?

Now comes my question: Some of our members are in a trial of Herceptin MCC-DM1 (fo shizzah) which is Herceptin with a toxin attached. So it would work by bringing the toxin directly to the cancer cell via the Her2 receptor. In this case, would it be better to have higher overexpression of Her2 so that more of the toxin would reach the cell, and if so, would oleic acid DECREASE the effectiveness of this treatment?

Just when I was about to start dousing my bread in EVOO...

not a propellerhead
 

oh jeez - first no vitamin D and now no EVOO... I'm screwed. I feel like my brain is about to melt. LOL

waiting for more opinions on this BIG MATTER for me !!!I just drink today 2 spoons of EVOO ...and tomorrow I will get my #5 infusion ...

Here's one of the "original" olive oil and HER2 studies
 

I found this article when I "originally" was not to get Herceptin and wanted to do what I could. In laymans terms, it was found that olive oil (46 % reduction of cell surface) provided "similar" results as Herceptin (48% reduction in cell surface), but TOGETHER they work synergistically (70% reduction in cell surface). SO I would drink up:)

http://www.ncbi.nlm.nih.gov/pubmed/1...ubmed_RVDocSum


RESULTS: Flow cytometric analyses demonstrated a dramatic (up to 46%) reduction of cell surface-associated p185(Her-2/neu) following treatment of the Her-2/neu-overexpressors BT-474 and SK-Br3 with OA. Indeed, this effect was comparable to that found following exposure to optimal concentrations of trastuzumab (up to 48% reduction with 20 microg/ml trastuzumab). Remarkably, the concurrent exposure to OA and suboptimal concentrations of trastuzumab (5 microg/ml) synergistically down-regulated Her-2/neu expression, as determined by flow cytometry (up to 70% reduction), immunoblotting, and immunofluorescence microscopy studies. The nature of the cytotoxic interaction between OA and trastuzumab revealed a strong synergism, as assessed by MTT-based cell viability and anchorage-independent soft-agar colony formation assays.


Rhonda

Hi Rhonda,
I read that too and it sure excited me. Makes the grossness of "drinking" it seem worth it. http://www.her2support.org/vbulletin...cons/icon7.gif

Hugs,
Mary Jo

Chrisy, I think your question alone demonstrates that you are perhaps a propellarhead yourself. I think you know the answer to your question too. I want to confirm what your concerns are via the posted article that Rhonda so kindly posted above. The p185 surface area was reduced following tx. with OA. Now, Herceptin also decreases the p185 surface area receptor site. When Herceptin and OA are given together, there is according to this article a synergistic reaction where both work to decrease the receptor site of p185, thus decreasing heterodimerzation with other deleterious her family members, such as her1 and her3. As the p185 receptor site is blocked with the help of herceptin and OA, phosphorlazation and the downward PI3K pathway is block to prevent cellular proliferation. As you can see H. and OA are working together to prevent cellular replication. However, in your trail, you are counting on the Herceptin and cytoxic agent to destroy the her2 molecule, not prevent it from replication as the study Rhonda posted. Therefore, you need all the Herceptin and cytoxic agent you can get into the p185 site in order to destroy THE HER2 MOLECULE. NO, YOU DO NOT WANT OA, IN THIS CASE, TO COMPETE WITH THE P185 RECEPTOR SITE. YOU WANT ALL THE CYTOXIC AGENT CARRIED BY HERCEPTIN INTO THAT HER2 SITE WITHOUT THE COMPETING OA, OA DOES NOT CARRY THE CYTOXIC AGENT. I WOULD DEFINATELY CUT OUT ALL OA IN YOUR DIET. IN FACT, I AM SURPRISED THAT THE TRAIL DOES NOT SPECIFY OA RESTRICTION. I WOULD WRITE A LETTER TO THE INVESTIGATORS ABOUT YOUR CONCERNS OVER OA.

RESULTS: Flow cytometric analyses demonstrated a dramatic (up to 46%) reduction of cell surface-associated p185(Her-2/neu) following treatment of the Her-2/neu-overexpressors BT-474 and SK-Br3 with OA. Indeed, this effect was comparable to that found following exposure to optimal concentrations of trastuzumab (up to 48% reduction with 20 microg/ml trastuzumab). Remarkably, the concurrent exposure to OA and suboptimal concentrations of trastuzumab (5 microg/ml) synergistically down-regulated Her-2/neu expression, as determined by flow cytometry (up to 70% reduction), immunoblotting, and immunofluorescence microscopy studies. The nature of the cytotoxic interaction between OA and trastuzumab revealed a strong synergism, as assessed by MTT-based cell viability and anchorage-independent soft-agar colony formation assays.

Propellerhead? Moi?
 

Robin,
You restated my concerns EXACTLY, only it sounded much more impressive and scientific! At best, I'm an illiterate propellerhead! Maybe we can go into business together translating this stuff between "english" and "science".

You come to the same opinion I did, and I will definitely pose this question.

Lily - let me know what you find out on your end, it's an interesting question, isn't it? On the other hand, you are clearly doing very well on this drug, so by the "proof is in the pudding" standard it seems not to be hurting.

Brenda, I think you should be ok on the EVOO since for you reducing the amount of Her2 would still be a good thing. In fact, you could probably have my share, too! Ever chug a bottle of EVOO???

If I were to predict, I would guess that the doc's answer will be to avoid ingesting excessive amounts of oleic acid. But unfortunately I doubt the recommendation will be to go back to eating butter!

Hoping to hear some more people weigh in on this...

This is an interesting thread. I've been wondering about this myself, only didn't quite know how to form the question coherently, so thanks Chris for bringing it up, it's really "food for thought".

<3 Lolly

Lani? RB? Help!
 

On the other hand... these articles suggeststhat something in EVOO reverses herceptin resistance by reducing the cleavage of the Her2 extracellular domain which as I read it, would present more receptors for the herceptin to bind to.

We are certainly complicated creations, aren't we?? I definitely need some expert help in interpreting this stuff.

Maybe I can get Dr. Menendez to accompany me to my appointment. Of course, I think he's in Spain now, so that might be a problem.

http://www.ncbi.nlm.nih.gov/pubmed/1...ubmed_RVDocSum

http://www.ncbi.nlm.nih.gov/pubmed/1...ubmed_RVDocSum

Chrisy, you did introduce a very interesting and good question, which is very technical and difficult to answer. I just want to further clarify this topic... doesn't olive oil reduce the number of her2 docking sites where herceptin would bind, not increase it? Because according to one of the articles you posted above, " oleuropein aglycone ( olive oil) treatment significantly reduced (note not increase!) HER2 ECD cleavage OR HERCEPTIN DOCKING SITES and subsequent HER2 auto-phosphorylation. " Wow, I am certainly not an expert, but Iam trying to help.I surely hope you can reach the researchers and clarify some of your pertinent questions and whether taking olive oil will effect your trail. I wish you the very best of luck and hope the new trail Herceptin you are trying will be very effective and completely successful! You deserve the very best. Take care. Please continue to post and let us know how you are doing in your trail. Praying for you.

Just plugging into this interesting conversation. Thanks for letting me follow along! :)

Side question: IF EVOO can make this dramatic synergy with Herceptin, WHY aren't oncologists standardly prescribing it alongside Herceptin? (outside of the dynamics in this thread) Seems like it only makes sense?!

Thanks

Terri

Robin,
As you can tell, I'm not a science person either, but I interpreted the second article as it decreased the cleavage (that is to say, the discarding of the extracellular "docking station") so to me that would present more receptors.

Really need some help from people who understand this stuff! I didn't get to see the doctor yesterday but will start there with these studies.

I think EVOO (as well as other nutritional interventions) are not prescribed is that the data is not compelling enough - there is evidence, but not "proof" that this effect is seen in humans. All these studies were in the petri dish I think. But I think human studies may be underway which is good, we definitely need answers. Joe posted I think in "articles of interest" a link to MD Anderson's complementary website evaluating this stuff. It was really good, but in terms of grades, most things were not conclusive and got a "C".

studies
 

Thanks, Chrisy!

So, the studies were inconclusive because the evidence was inconclusive, or because there's just not been the "real people" studies to prove it one way or another? This drives me nuts. Kajillions of dollars spent to try to prove expensive drugs, but we can't get our act together to show what nutrients will help and which will hurt for certain.

Agreed, agreed with Terri and others. Although foods and/or supplements are powerful medicines (or in the case of McDonalds - poisons), they have not been part of any clinical trials therefore much remains to be totally proven. And doctors don't recommend or try anything without a proven trial - hence some situations many of us have been in during this journey.

However, there are some bonefide facts - a healthful diet is healthy. When I was on Herceptin therapy, if I didn't have a salad everyday that I made a dressing with extra virgin olive oil, I would take a tablespoon off a spoon. I was at my sister's once and my niece saw me do this. She immediately told my sister who told my niece - its one of those things Aunt Becky does. If she believes it helps her then it does.

Another good way to get your daily dose of EVOO (at least I like it this way :) ) is, if you like hot cereal in the morning, instead of butter add a tblsp. of EVOO. It tastes pretty good on oatmeal, along with a little brown sugar and soy milk!

<3 Lolly

Tsund.

Re your observation.

Who will / funds trials that involve risk reduction through lifestyle and diet?

And why ?

R.B.,

Yes, that is the crux, isn't it?

TRS

Tsund

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<img src="http://img52.exs.cx/img52/4566/i7pfrusty.gif" alt="Hitting Head Against Wall" />

YES !

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Our onc did this interview, I do not know how old it is:

http://www2.healthtalk.com/go/cancer...om-coming-back