What Are Stem Cells?
Stem cells are master cells of the body that are available for repairing damaged tissues and organs including spine discs and cartilage cushions in the joints Stem cells are cells that have the ability to divide and develop into many different cell types in the body. Stem cells may also help repair the body by dividing to replenish cells that are damaged by disease, injury, or normal wear.
When a stem cell divides, each new cell has the potential either to remain a stem cell or to become another type of cell with a more specialized function, such as a nerve cell, cartilage cell, disk cell, bone cell..
Three types of stem cells have been identified:
- Adult stem cells
- Human embryonic stem cells
- Induced pluripotent stem cells
These three types of stem cells share properties:
- They are capable of surviving over long periods and divide to make additional stem cells.
- They are unspecialized (“blank slates” that can become specific types of cells).
- They can develop into specialized cell types (cells that do specific work in the body).
Adult stem cells can be found throughout the body. They are found as unspecialized cells among the specialized cells in tissues and organs. +An adult stem cell can either divide to make more adult stem cells, or differentiate to produce some or all of the major specialized cell types of the tissue or organ.
Human embryonic stem cells (hESC) come from embryos that develop from eggs that have been fertilized in vitro (in a test tube or another artificial environment). Embryonic stem cells can develop into any specialized cell type in the body.
Induced pluripotent stem cells (iPS) are generated by reprogramming adult cells that have already differentiated into a specific cell, such as a skin cell. After reprogramming, iPS cells are able to develop into any specialized cell type in the body.
There are two accessible sources of autologous adult stem cells in humans:
- Bone marrow, which requires extraction by harvesting, that is, aspiration through a simple needle.
- Adipose tissue (fat cells), which requires extraction by simple, non-surgical liposuction, through a needle