Unbalding my response was to post #107. I explained that the dermal papilla acts as a instructive niche for the progenitors cells in the hair follicle in post #106. In response to post #107 however I explain that he can't make such a statement. First of all you can't say that upregulation of progenitor cells will act as the cure. Cotsarelis would understand this he even mentions this in his study in 2011;
After that study of Cotsarelis we have come to understand that the dermal papilla niche is regulating these progenitors. So if the dermal papilla is altered for instance as shown by other researchers it would automatically lead to a lack of progenitors. This would make the lack of progenitors a secondary event. I hope you understand this so far and everyone else. So to argue that upregulation of progenitors will lead to a cure is ridiculous.
Now he also mentioned that PGD2 down and PGE2 up needs to be done to provide a cure. Well in post #108 (
https://www.baldtruthtalk.com/thread...l=1#post219757) I reply. Not with the intention of showing you that PGE2 is carcinogenic. No I reply that the guy is using many compounds that have a lot of effect on downstream pathways.
Look 17b-estradiol tends to grow awesome hair in some people. Can we shout now that 17b-estradiol is a cure now? Hell no. If we look at 17b-estradiol it has much effect on downstream pathways(1);
-P53
-Cyclin D1
-MAPK Pathway
-IGF-1
-SHH
-WNT
-EGFR
-BMP's
And many more. So (some) of these downstream pathways might be attributing to the pro-hair growth effects of 17b-estradiol. Not because 17b-estradiol binds to both estrogen receptors (ERa and ERb) in the hair follicle. Same thing with minoxidil. It grows hair but we don't understand which pathways or what mechanism is responsible for this. If we do know the pathways responsible for it we could perhaps modulate them directly which would possibly provide a far better result. However that could lead to safety concerns obviously but you get the point.
So PGE2 binds to the EP receptors and has many effect on downstream pathways too. So if we go to Garza his study;
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3982925/. He says that PGE2 has pro-carcinogenic effects and links to two studies. Let's take one of these studies;
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2759608/. We can see that PGE2 in this study has an effect on
- Cyclin D1
- MAPK pathway
- EGFR
- Other stuff
Hey, do you see some correlations between the two compounds? Now this just acts as an example to explain things but I hope you get the point now. For instance we do know that PGF2A (bimatoprost) grows hair. Does that mean that PGF2A has a big role upstream in the pathway of AGA or acts as a cure? Nope it could have a very small role in the pathology of AGA. Yet it seems to grow hair. That seems strange right? But this can be because using a compound like PGF2A can actually have downstream effect on other pathways that
DO have a bigger role upstream in the pathology of AGA.
And I repeat again we don't know what happens after AR activation. I don't concur with the whole prostaglandin hypothesis. I concur with other researchers that master regulatory pathways come into play that decide cell fate decision in the dermal papilla niche. This ultimately leads to an altered dermal papilla niche. We have seen from studies that the dermal papilla regulates hair follicle size. An altered dermal papilla niche would indeed cause a lack of progenitors. I have seen to many correlations and find the evidence of other researchers having it on the right end way way more convincing. Besides that the attention on that hypothesis overall is way more focused than the prostaglandin hypothesis. This is only my opinion. Time will tell eventually.
Hopefully you have gained a bit more insight now. After that reply of my post someone else posted that I was wrong with a total broscience response. So I just reacted to that again. Many things can act as a carcinogen that doesn't mean that they will CAUSE cancer. Read this page and understand for yourself
http://www.cancer.org/cancer/cancerc...an-carcinogens
Hope that helps unbalding. I wasn't trying to project fear. No, my intention was to explain that some things are far more complex than most think they are. We definitely can't look at someone his temples who grows some intermediate vellus hair by using a whole array of compounds/methods and then make a conclusive statement that this is because of upregulation of PGE2, downregulation of PGD2 and enhancing progenitors or that that will act as a cure. That´s pure broscience.
(1)
http://press.endocrine.org/doi/full/...0/er.2006-0020
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