Duchenne muscular dystrophy (DMD) is the most common and serious form of muscular dystrophy. One out of every 3500 boys is born with the disorder, and it is invariably fatal. Until recently, there was little hope that the widespread muscle degeneration that accompanies this disease could be combated.
However, stem cell therapy now offers that hope. Like other degenerative disorders, DMD is the result of loss of cells that are needed for correct functioning of the body. In the case of DMD, a vital muscle protein is mutated, and its absence leads to progressive degeneration of essentially all the muscles in the body.
To begin to approach a therapy for this condition, we must provide a new supply of stem cells that carry the missing protein that is lacking in DMD. These cells must be delivered to the body in such a way that they will engraft in the muscles and produce new, healthy muscle tissue on an ongoing basis.
We now possess methods whereby we can generate stem cells that can become muscle cells out of adult cells from skin or fat by a process known as reprogramming. Reprogramming is the addition of genes to a cell that can dial the cell back to becoming a stem cell. By reprogramming adult cells, together with addition to them of a correct copy of the gene that is missing in DMD, we can potentially create stem cells that have the ability to create new, healthy muscle cells in the body of a DMD patient. This is essentially the strategy that we are developing in this proposal.
We start with mice that have a mutation in the same gene that is affected in DMD, so they have a disease similar to DMD. We reprogram some of their adult cells, add the correct gene, and grow the cells in incubators in a manner that will produce muscle stem cells. The muscle stem cells can be identified and purified by using an instrument that detects characteristic proteins that muscles make.
The corrected muscle stem cells are transplanted into mice with DMD, and the ability of the cells to generate healthy new muscle tissue is evaluated. Using the mouse results as a guide, a similar strategy will then be pursued with human cells, utilizing cells from patients with DMD. The cells will be reprogrammed, the correct gene added, and the cells grown into muscle stem cells. The ability of these cells to make healthy muscle will be tested by injection into mice with DMD that are immune-deficient, so they will accept a graft of human cells.
In order to make this process into something that could be used in the clinic, we will develop standard procedures for making and testing the cells, to ensure that they are effective and safe. In this way, this project could lead to a new stem cell therapy that could improve the clinical condition of DMD patients. If we have success with DMD, similar methods could be used to treat other degenerative disorders, and perhaps even some of the degeneration that occurs during normal aging
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Stem Cell Therapy for Duchenne Muscular Dystrophy ...
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