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Stem Cells & Healing?

Taffer said:
Do you think stem cells are just flowing through our body healing damaged bits all the time, Kumar?
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Apparently, yes. He doesn't know the difference between stem cells and white blood cells.

Actually, the nearest thing we have to what he's thinking of is metastatic cancer.
 
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". Where are adult stem cells found, and what do they normally do?
Adult stem cells have been identified in many organs and tissues, including brain, bone marrow, peripheral blood, blood vessels, skeletal muscle, skin, teeth, heart, gut, liver, ovarian epithelium, and testis. They are thought to reside in a specific area of each tissue (called a "stem cell niche"). In many tissues, current evidence suggests that some types of stem cells are pericytes, cells that compose the outermost layer of small blood vessels. Stem cells may remain quiescent (non-dividing) for long periods of time until they are activated by a normal need for more cells to maintain tissues, or by disease or tissue injury.

Typically, there is a very small number of stem cells in each tissue, and once removed from the body, their capacity to divide is limited, making generation of large quantities of stem cells difficult.
http://stemcells.nih.gov/info/basics/basics4.asp "
 
Yes. Bone marrow contains stem cells, as I said. It's the most notable example stem cells in adult mammals. (Well, that and the testes.)

There are small numbers of stem cells present in other tissues.

These are NOT in circulation. They do NOT repair injuries outside their specific organs. No mammal has the ability to regrow lost limbs. This is not something humans have lost for whatever fanciful reason you might propose. We never had it in the first place, because the creatures we evolved from never had it in the first place.

Stem cells are NOT involved in the normal response to infection or injury. That's white blood cells.
 
Kumar said:
". Where are adult stem cells found, and what do they normally do?
Adult stem cells have been identified in many organs and tissues, including brain, bone marrow, peripheral blood, blood vessels, skeletal muscle, skin, teeth, heart, gut, liver, ovarian epithelium, and testis. They are thought to reside in a specific area of each tissue (called a "stem cell niche"). In many tissues, current evidence suggests that some types of stem cells are pericytes, cells that compose the outermost layer of small blood vessels. Stem cells may remain quiescent (non-dividing) for long periods of time until they are activated by a normal need for more cells to maintain tissues, or by disease or tissue injury.

Typically, there is a very small number of stem cells in each tissue, and once removed from the body, their capacity to divide is limited, making generation of large quantities of stem cells difficult.
http://stemcells.nih.gov/info/basics/basics4.asp "
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A simple "no" would have sufficed.

These stem cells do not repair damage all over the body. These stem cells do not respond to infection or injury. These stem cells do not circulate. These stem cells do not increase in number when the body is damaged or ill. You are wrong.
 
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PixyMisa said:
Yes. Bone marrow contains stem cells, as I said. It's the most notable example stem cells in adult mammals. (Well, that and the testes.)

There are small numbers of stem cells present in other tissues.

These are NOT in circulation. They do NOT repair injuries outside their specific organs. No mammal has the ability to regrow lost limbs. This is not something humans have lost for whatever fanciful reason you might propose. We never had it in the first place, because the creatures we evolved from never had it in the first place.

Stem cells are NOT involved in the normal response to infection or injury. That's white blood cells.
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I quote again:-

Where are adult stem cells found, and what do they normally do?
Adult stem cells have been identified in many organs and tissues, including brain, bone marrow, peripheral blood, blood vessels, skeletal muscle, skin, teeth, heart, gut, liver, ovarian epithelium, and testis. They are thought to reside in a specific area of each tissue (called a "stem cell niche"). In many tissues, current evidence suggests that some types of stem cells are pericytes, cells that compose the outermost layer of small blood vessels. Stem cells may remain quiescent (non-dividing) for long periods of time until they are activated by a normal need for more cells to maintain tissues, or by disease or tissue injury.

Typically, there is a very small number of stem cells in each tissue, and once removed from the body, their capacity to divide is limited, making generation of large quantities of stem cells difficult.
http://stemcells.nih.gov/info/basics/basics4.asp
Click to expand...

In this peripheral blood, blood vessels, skeletal muscle, skin etc. are mentioned. It is also mentioned;Stem cells may remain quiescent (non-dividing) for long periods of time until they are activated by a normal need for more cells to maintain tissues, or by disease or tissue injury. As of now limb growing is not possible but in future we can't say.

Look at my personal experiance;

Sometime back, I got minor similar injuries on my both shoulders on fall. On one side I applied antiseptic lotions & antibiotic cream but nothing on other side. To my surprise, when these healed, one side where I applied lotion & cream there was scar but not on other side. Can you comment?
 
Taffer said:
A simple "no" would have sufficed.

These stem cells do not repair damage all over the body. These stem cells do not respond to infection or injury. These stem cells do not circulate. These stem cells do not increase in number when the body is damaged or ill. You are wrong.
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From where WBCs come?
 
Mojo said:
Are you sure that this thread is, as you have claimed, not about homoeopathy?
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Not exactly but if somethinf relevant can be there, I may not hesitate. For it,

Can you tell me healing variations in people living in sandy & non sandy areas?
 
Kumar said:
As of now limb growing is not possible but in future we can't say.
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We can say-No.
Look at my personal experiance;

Sometime back, I got minor similar injuries on my both shoulders on fall. On one side I applied antiseptic lotions & antibiotic cream but nothing on other side. To my surprise, when these healed, one side where I applied lotion & cream there was scar but not on other side. Can you comment?
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What does your irrelevant biased personal experience have got to do with anything stated so far?
 
Kumar said:
I quote again
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Why?

I understood it fine the first time. The point is, you don't.

In this peripheral blood, blood vessels, skeletal muscle, skin etc. are mentioned.
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Yes. Did you understand any of that?

It is also mentioned;Stem cells may remain quiescent (non-dividing) for long periods of time until they are activated by a normal need for more cells to maintain tissues, or by disease or tissue injury.
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Yes. Did you understand any of that?

As of now limb growing is not possible but in future we can't say.
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No.

Wrong.

Completely wrong.

We CANNOT regenerate limbs. We do not have the stem cells to do so. No human has ever had the stem cells to do so. No mammal has the stem cells to do so. Birds don't have the stem cells either. Some reptiles can regenerate their tails, though the regeneration isn't always accurate and they still can't regenerate limbs. Some species of amphibian can regenerate limbs.

We are not amphibians.

Look at my personal experiance
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Why?

Sometime back, I got minor similar injuries on my both shoulders on fall. On one side I applied antiseptic lotions & antibiotic cream but nothing on other side. To my surprise, when these healed, one side where I applied lotion & cream there was scar but not on other side. Can you comment?
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Yes. You have no understanding of how to formulate and test a hypothesis.
 
Kumar said:
From where WBCs come?
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From the bone marrow. Remember that bone marrow has stem cells? Well, what those stem cells do is produce blood cells - red blood cells (which carry oxygen), white blood cells (which are involved in immune and inflammatory response) and platelets (which cause blood to clot).
 
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