To support my posit that we may not see a cure for hair loss for many years and that there are still technical problems to be solved I will copy and paste quotes from the recent HairLossTalk.com interview with Team Tsuji.
Mr. Toyoshima is a rep of Team Tsuji. Please note that below in item 1 he states that there is still a tech issue to be solved and he refers to that tech issue as a "significant challenge globally". In other words, this is not a minor problem and researchers the world over are having the same problem. I admit that he says Team Tsuji has some ideas how to solve these problems and he expects to solve these problems soon, but to this point no statement has come from Team Tsuji stating that the problem is solved. And it is common for researchers to say that they have ideas for solving tech problems but then it doesn't happen. I've read tons of positive assessments from researchers over the years and so far it has all fizzled out.
1. Mr. Toyoshima: For applications of our technology, both mesenchymal stem cells and epithelial stem cells, which are applicable to human clinical applications, are needed. With respect to the development of the technology to cultivate mesenchymal stem cells, that is papilla cells, being applicable to human clinical trials, we are already in progress now for development. On the other hand, as for the technology to cultivate epithelial stem cells of follicles, it still remains a significant challenge globally. We are currently in the middle of research and development for this. Based on our recent research results, we finally have some prospects and expect this issue to be resolved in the near future.
Here is another statement by Mr. Toyoshima where he says that this problem is a major problem and it involves making the necessary amount of cells while retaining the safety and functionality of the cells. In other words, INDUCTIVITY. This is the same problem all scientists all over the world are having with hair cells and researchers have been trying to solve this same INDUCTIVITY problem for years and years. And they always sound optimistic but this is a B-I-G problem. This problem is why Replical only arrested hair loss and regrew small amounts of hair. And the same as this problem prevented Replicel from growing lots of hair it can also prevent Tsuji from growing lots of hair.
2. Mr. Toyoshima: Yes, as I mentioned earlier, we consider the development of the technology to culture epithelial stem cells as the most significant issue we face. In order to regenerate a clinically effective number of follicles, a sufficient number of cells need to be secured while satisfying the safety and functional requirements. These are tough challenges, so also pose major issues to us.
Here below is another key point stated by Mr. Toyoshima from Team Tsuji and he is saying exactly what I've been saying. He says that since the cells will come from your donor area this means that the new hairs will be the same as your donor hairs. Now keep in mind that many of us with hair loss are seeing some thinning even in our donor area. And many of us who aren't seeing thinning in our donor areas YET will at some point in the future. This means that even if Tsuji solves his inductivity problem and you get new hairs from it, the new hairs would eventually get thinner over time the same as your donor area will.
3. Mr. Toyoshima: For regeneration of hair, the most important thing is whether hair can be regenerated or not rather than gene expression. In this sense, we conducted animal testing to regenerate hair and analyzed its form, and the internal structures which characterize hair. Further, we analyzed hair growth cycles. Hair grows and falls in cycles and in certain intervals between growth and resting phases. So we conducted analysis on these patterns. These analyses indicated that the form, internal structure, and especially hair cycle of regenerated hair will typically match all those traits from the follicles where the cells were originally collected. These factors are the most critical factors in defining the length and width of hair. As we succeeded in regenerating all of these factors, we feel that we have succeeded in regenerating all the characteristics which largely contribute to formation of naturally growing hair. We have succeeded in regenerating hair similar to the original normal hair.
The interviewer, Mr. Keiko, delves further into this issue by raising the issue that some people's donor area will also thin over time and asks if there is a way to solve this problem. Here is Mr. Keiko's question:
Interviewer Keiko: Certain individuals with advanced androgenetic alopecia experience significant miniaturization of follicles and extensive loss on the sides and back of the head. This is the typical location for donor follicles for transplants and with your therapy. As a result, these donor follicles may be extensively affected by Androgenetic Alopecia prior to the procedure. What can these people expect from your therapy?
Below is Mr. Toyoshima's response. Please note that Mr. Toyoshima acknowledges that some people's Androgenetic Alopecia will advance and their donor area hair will thin. It's my contention that if and when this happens then their newly implanted hairs will also thin. This is the second issue I raised as a problem. I have said that there are 3 problems. Two of those problems are (1) INDUCTIVITY and (2) continued Androgenetic Alopecia regression in the donor hair resulting in thinning of newly implanted hairs.
4. Mr. Toyoshima: This question rather relates to the Androgenetic Alopecia clinical condition; therefore, I believe it would be more appropriate for a physician to talk about this. However, I can provide you with an answer from a biologist perspective. It is thought that the site of Androgenetic Alopecia onset is already determined in the stage wherein the follicular organ is generated, and follicular papilla cells store information such as destiny, determining the site of male pattern alopecia onset, to a certain degree. Consequently, follicles on the back of the head and those on the front of the head will have different destinies, and it is thought that patients with alopecia develop the disease in a specific site in this manner. As the disease gradually progresses, follicles on the back of the head and also those on the side of the head also become miniaturized. However, even though the disease has progressed into those areas, there is still a large number of normal follicles left. Based on this, we are currently conducting a human-tissue study using dermal tissues collected from the back of Androgenetic Alopecia patients’ heads in order to verify the possible number of normal follicles which can be collected from such areas, and whether cells collected from such areas have the function needed for follicular regeneration, etc. So far, we have found out that there is a large number of normal follicles on the back of Androgenetic Alopecia patients. We believe that collecting the cells from such areas will definitely result in regeneration of normal follicles.
Here below Mr. Toyoshima again talks about lost "functionality" (aka INDUCTIVITY) when culturing cells. He says he can culture DP cells without losing functionality but he still can't culture epithelial stem cells without losing "functionality". He's saying that he's having the same inductivity problems that everyone else is having. He sounds optimistic but he doesn't say that the problem is solved. Also, it's common for researchers to sound optimistic. What really matters is when they say that a problem is, in fact, solved. He isn't saying that yet and researchers have been wrestling with this problem for numerous years.
5. Mr. Toyoshima: Generally speaking, it is said that there is a limit to stem cell proliferation. It is generally known that the stem cell function is lost with proliferation, therefore yes, there is limit to stem cell proliferation. In case of human follicular papilla cells having the function as the mesenchymal stem cells, the stems cells can be multiplied by several thousands of times in 3 weeks when we use our technologies. On the other hand, as for the epithelial stem cells, as I mentioned earlier we are still in research for this, therefore there is only a small number of human cases. Consequently, an accurate value for this case is yet to be determined in the near future. However, collectively from these researches, we think that we may be increase follicles at least by about 1,000 times.