How does the body heal itself?

In a video interview, Luis Romero Guerra, M.D., talks about the magic of the human body.
The way in which the human body heals itself, or renews itself, or regenerates itself, is through its stem cells. Tissues, organs, and stem cells are found throughout the body. Organs and tissues that have sustained damage or that are being damaged for one reason or another make use of nearby stem cells.
As it turns out, when a disease is more advanced than the local stem cells can cure, as in the case of diabetes where the problem is in the pancreas, the body is unable to do what it was designed to do, in this case, to produce insulin. When we bring a large quantity of stem cells to such a pancreas, the body is able to do what it was designed to do.
How does this happen? How do these stem cells decide to go to the pancreas or the liver or the brain or the heart or to other areas and repair the damaged tissues? It’s because damaged tissue emits chemical markers that the stem cells recognize. These chemical markers are well-known to modern medicine, so well-known that, when labs analyze blood to diagnose diseases, they look for these chemical markers. What I mean is that, if a patient has a healthy liver, the lab isn’t going to find any of these chemical markers. If the patient has a damaged liver, the lab is going to find these chemical markers in the blood and in the tissue surrounding the liver. Stem cells sense these markers, collect up around them, and then start transforming themselves into the healthy form of whatever tissue is damaged.
This has been demonstrated scientifically. It is no longer a hypothesis or a theory. There have been studies in which various organs were deliberately damaged, then specially tagged stem cells were applied, and those stem cells transformed themselves into new tissue for the damaged organs.
For this therapy, the quantity of stem cells applied to the damaged area is much greater than the quantity of nearby stem cells. They can come from many sources. They are treated to develop into particular tissues – muscle, cartilage, nerve tissue, pancreatic tissue, whatever – and then injected into the appropriate area, where they transform themselves into healthy tissue.
Currently, medical science doesn’t know the specific steps that stem cells take to transform themselves into specialized tissues. Medical science accomplishes this transformation without knowing the individual steps that the cells must take. It happens because the body is the greatest laboratory there is. When the stem cells are introduced into the body, they are in the most appropriate environment. A stem cell implanted in a liver, depending on the condition of the patient – their levels of oxygen, hormones, etc. – transforms sooner or later into a liver cell. It isn’t going to turn into bone or cartilage because it’s receiving a stimulus specific to liver cells and so it turns into one.
The body doesn’t have the ability to move around large amounts of stem cells. But that’s exactly what we do in the clinic. We introduce a lot of stem cells into the bloodstream so that the body might make use of them. Naturally occurring stem cells are limited, by their quantity, in how much they can repair. When disease or damage is greater than what these stem cells can fix, something needs to be done and what we do is introduce large amounts of stem cells.
We have the ability to use bone-marrow stem cells immediately, extracting them fresh and minimizing damage to them in order to ensure that the patient receives greatest concentration possible of live, active stem cells that retain all of their transformative capabilities.
Among all the forms of stem cell therapy, I don’t believe there is a safer one than autologous treatments. In all of the cases at ProgenCell , we have not had even one complication. Zero. I think we need to be focusing on autologous approaches, not homologous nor allogous because those others have drawbacks.

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