|
Human Embryonic Stem Cells (HESC) |
|
|
|
|
STEM CELL INFORMATION - Source : National Institute of Health
Stem Cell Basics
- Introduction: What are stem cells, and why are they important?
- What are the unique properties of all stem cells?
- What are embryonic stem cells?
- What are adult stem cells?
- What are the similarities and differences between embryonic and adult stem cells?
- What are induced pluripotent stem cells?
- What are the potential uses of human stem cells and the obstacles that must be overcome before these potential uses will be realized?
- Where can I get more information?
I. Introduction: What are stem cells, and why are they important?
Stem cells have the remarkable potential to develop into many different cell types in the body during early life and growth. In addition, in many tissues they serve as a sort of internal repair system, dividing essentially without limit to replenish other cells as long as the person or animal is still alive. When a stem cell divides, each new cell has the potential either to remain a stem cell or become another type of cell with a more specialized function, such as a muscle cell, a red blood cell, or a brain cell.
Stem cells are distinguished from other cell types by two important characteristics. First, they are unspecialized cells capable of renewing themselves through cell division, sometimes after long periods of inactivity. Second, under certain physiologic or experimental conditions, they can be induced to become tissue- or organ-specific cells with special functions. In some organs, such as the gut and bone marrow, stem cells regularly divide to repair and replace worn out or damaged tissues. In other organs, however, such as the pancreas and the heart, stem cells only divide under special conditions.
Until recently, scientists primarily worked with two kinds of stem cells from animals and humans:embryonic stem cells and non-embryonic "somatic" or "adult" stem cells. The functions and characteristics of these cells will be explained in this document. Scientists discovered ways to derive embryonic stem cells from early mouse embryos nearly 30 years ago, in 1981. The detailed study of the biology of mouse stem cells led to the discovery, in 1998, of a method to derive stem cells from human embryos and grow the cells in the laboratory. These cells are called human embryonic stem cells. The embryos used in these studies were created for reproductive purposes through in vitrofertilization procedures. When they were no longer needed for that purpose, they were donated for research with the informed consent of the donor. In 2006, researchers made another breakthrough by identifying conditions that would allow some specialized adult cells to be "reprogrammed" genetically to assume a stem cell-like state. This new type of stem cell, called induced pluripotent stem cells (iPSCs), will be discussed in a later section of this document.
Stem cells are important for living organisms for many reasons. In the 3- to 5-day-old embryo, called ablastocyst, the inner cells give rise to the entire body of the organism, including all of the many specialized cell types and organs such as the heart, lung, skin, sperm, eggs and other tissues. In some adult tissues, such as bone marrow, muscle, and brain, discrete populations of adult stem cells generate replacements for cells that are lost through normal wear and tear, injury, or disease.
Given their unique regenerative abilities, stem cells offer new potentials for treating diseases such as diabetes, and heart disease. However, much work remains to be done in the laboratory and the clinic to understand how to use these cells for cell-based therapies to treat disease, which is also referred to as regenerative or reparative medicine.
Laboratory studies of stem cells enable scientists to learn about the cells’ essential properties and what makes them different from specialized cell types. Scientists are already using stem cells in the laboratory to screen new drugs and to develop model systems to study normal growth and identify the causes of birth defects.
Research on stem cells continues to advance knowledge about how an organism develops from a single cell and how healthy cells replace damaged cells in adult organisms. Stem cell research is one of the most fascinating areas of contemporary biology, but, as with many expanding fields of scientific inquiry, research on stem cells raises scientific questions as rapidly as it generates new discoveries.
I. Introduction | Next 
Continue Reading from HERE
|
|
Last Updated on Thursday, 09 September 2010 17:21 |
|
New Stem Cell treatment helps MS patients achieve ‘long-lasting remission’ |
|
|
|
|
BY DALSON CHEN, WINDSOR STAR MAY 3, 2010 9:43 AM
WINDSOR, Ont. — Ottawa doctors, who claim a new medical technique can cause a “very long-lasting remission,” are giving hope to multiple sclerosis patients.
“The inflammatory nature of the disease has virtually ceased in everyone who has received this transplant,” said neurologist Dr. Mark Freedman, who led the study with bone marrow transplant specialist Dr. Harold Atkins.
Freedman said he’s hesitant to say that the transplant of bone marrow stem cells can “cure” multiple sclerosis.
“I hate to use the C-word ... but we’ve induced a very long-lasting remission,” he said.
Aaron Prentice, 35, said he has been “blessed” to be part of the study, which investigates the theory that a person’s immune system can be reset.
Stem cells are harvested from the patient’s blood. Next, the patient’s immune system is destroyed through intense chemotherapy. Then the stem cells are reintroduced with the hope that when the immune system grows back, it will no longer attack the nervous system.
“Kind of like rebooting a computer,” said the Windsor man.
Multiple sclerosis causes the body’s own immune system to attack the fatty myelin sheaths that surround the axons that transmit electrical signals between the nerve cells in the brain and spinal cord. This hampers the ability of the cells to communicate, leading to a weakening and wasting of the muscles.
Freedman and Atkins plan to release the results of the research later this year.
Continue to read from Canada.com
|
|
Last Updated on Friday, 04 June 2010 12:34 |
|
Advancing Stem Cell Therapies for Multiple Sclerosis |
|
|
|
|
Susan Aldridge, Ph.D.
The UK Stem Cell Foundation (UKSCF) and the Multiple Sclerosis Society joined forces to accelerate the transfer of stem cell science into the clinic to help patients with multiple sclerosis (MS). Up to £1 million of seed funding is to be made available to applicants starting in September. The hope is to get Phase I/II trials of stem cells in MS under way over the next year or so, with initial results expected in 2012.
This is the first disease-specific collaboration for UKSCF, whose mission is to fund the gap between promising stem cell research and clinical trials. It was announced at a special meeting of the London Regenerative Medicine Network (LRMN) on January 14. “MS and advanced stem cell-based therapies—an ABC guide” was the first of a series of new disease-themed meetings to be hosted by LRMN.
“Everyone thinks there is potential for stem cell therapy in MS, but there have been some studies of dubious worth,” noted Mary Archer, UKSCF trustee and chairman of Cambridge University Hospitals NHS Foundation Trust. “Benefit will only be seen from long-term clinical trials. There is no shortcut, but we are seeking to accelerate the process by joining with the MS Society.”
Stem cell therapies for MS aim to prevent or repair the demyelination of nerve fibers, which is the hallmark of the disease. Two different approaches were described at the LRMN meeting. Professor Robin Franklin, director of the MS Society Cambridge Centre for Myelin Repair, explained that a major problem in MS is that the inherent regenerative process, which would otherwise remyelinate nerve fibers, is not sustained. Therapy could be based on either transplanting myelinogenic oligodendrocytes into the patient or on promoting remyelination by endogenous neural stem cells (NSCs).
Targeting the Wnt Pathway
As long ago as 1993, Franklin and colleagues were able to show remyelination in animals by transplanting NSCs. “We thought we were not far from transplantation, but there was a problem in obtaining cells from humans.” It was not until 2008 that Steve Goldman of the University of Rochester Medical Centershowed that human NSCs can remyelinate the entire brain in a mouse model of a genetic demyelinating disease.
MS, however, is not genetic. It is an autoimmune disease, and transplanted cells are not likely to patch up damaged areas in this way. “We should be able to get the brain to repair the damage itself rather than use a transplant,” Franklin pointed out.
Continue to read from the Genetic Engineering website
|
|
Last Updated on Tuesday, 26 January 2010 09:28 |
|
Two MS patients take part in controversial cell treatment |
|
|
|
|
Taking an injection of pureed sheep fetus organs mixed with saline solution may sound like something out of the television show “Fear Factor,” but for two local women suffering from multiple sclerosis, live organo cell therapy brings relief.
First injected into patients intramuscularly by Swiss doctor Prof. Paul Niehans in 1931, live cell therapy uses stem cells from other mammal species to trigger the growth of new cells in humans. The therapy is used to treat a variety of ailments from premature aging and immune deficiencies to degenerative bone disorders, liver and kidney disease and even impotence in men.
The unusual procedure is not without medical controversy regarding health benefits and resulting allergic reactions and is generally debunked in the United States.
For that reason, Naples residents Dr. Debbie Heil and RN Lisa Luthringer travel to Villa Medica in Edenkoben, Germany, twice a year for treatments under the direction of third-generation therapy physician Dr. Robert Janson-Muller.
It was Janson-Muller’s demonstrated success with treating neurological disorders such as multiple sclerosis and paralysis following stroke that caught Heil’s attention.
“MS is a mystery disease,” she says. “No one knows what causes it or whether it’s environmental, genetic or viral. It’s so unpredictable, there’s no standard course of treatment and at any moment, you can experience a new, unexpected crisis. Not one person who has MS shows symptoms or signs that follow the textbook cases.”
Heil and Luthringer met at a tea for physicians’ wives in 2000 and later founded two nonprofit organizations, the Multiple Sclerosis Center of SWFL, a support group, and the Heil Luthringer Foundation, which focuses on education.
Despite her husband’s misgivings, Heil completed her first live cell treatment in October 2002 and has completed 13 injections since. Luthringer completed her first therapy in April 2002. The following accounts detail their experiences.
> Continue reading from the Collier Citizen
.
|
|
Last Updated on Saturday, 23 January 2010 10:06 |
|
What if researchers could reboot a misfiring immune system? |
|
|
|
Body Attacks Self; Body Protects Self
posted October 14, 2009
New studies show promise for using a person's own stem cells to protect them from autoimmune disorders like diabetes and multiple sclerosis
.
What if researchers could reboot a misfiring immune system? That is the intriguing possibility raised by stem cell transplant specialist Richard Burt. He is pioneering a new treatment for autoimmune disorders, one in which patients’ immune systems are suppressed and then replaced with an infusion of their own immune stem cells, filtered out from their blood. These then grow into all types of blood cells, including the white blood cells of the immune system.
.
In autoimmune disorders, the immune system goes haywire and attacks the body’s own tissues. In the case of type 1 diabetes, it destroys the insulin-producing cells in the pancreas, and in multiple sclerosis it strikes the central nervous system.
.
Continue to read from our MS Blog
|
|
Last Updated on Sunday, 18 July 2010 09:14 |
|
Relating to Stem Cell Therapies |
|
|
|
|
May 2009
Because there is still much debate over Stem Cell therapies, for those that want to know more, I ask that you visit both our MS Blog and Library of MS Archives.
Use the search screen at either location.
Type: Stem Cell and click enter.
The stories/articles that are posted at each site, will then appear.
ALSO, NOW FOUND in our Resources section is a link to Stem Cell Related Information.
==============================
|
|
Last Updated on Saturday, 27 February 2010 19:47 |
|