Stem Cells (SC) offer an incredible potential to instill a new lease of life virtually to any organ of the human body, bringing them back to the pre-disease state through its own biological repair mechanism. Intensive research initiatives are on across the world to harness this unique possibility that will be able to successfully address a plethora of serious and chronic ailments for mankind. The good news is, the global scientific community is taking rapid strides in understanding the complex stem cell biology to give shape to a game changing medical treatment blue print for tomorrow.
Capturing one such pursuit, on February 21, 2017, well-reputed British news daily – ‘The Telegraph’, reported the outcome of a path-breaking medical study for freezing the progression of yet another complex and crippling ailment – Multiple Sclerosis (MS). This research followed a unique SC transplantation process. Intriguingly, both such diseases and the treatment are not generally much talked about, particularly in India. If done, it would increase public awareness and help many patients fetch greater benefits from the available and approved SC therapy in the country. Probably, considering the unfathomable scope of the body’s own repairing toolbox with SC, Prime Minister Narendra Modi reportedly called on Indian biologists to motivate school children for pursuing a career in stem cell research.
Let me now go back for a moment to Multiple Sclerosis (MS) as I am aware of this this disease condition rather closely. One of our close family friends who was a very senior official in one of the top multinational corporations of the world, had to give up his job prematurely being a victim to this serious illness. In that sense, this particular news item rekindles a new hope for many to look for a better quality of life while managing many other diseases of such kind, all over the world, including India.
‘The Telegraph’ reported: in so far, the largest long-term follow-up of SC transplantation treatment study of MS, which was spearheaded by Imperial College London, established that 46 per cent of patients who underwent this treatment did not suffer a worsening of their condition for five years. The treatment works by destroying the immune cells responsible for attacking the nervous system. This is indeed a very significant development in the space of medical research.
This new treatment, called autologous hematopoietic stem cell transplantation (AHSCT), was given to patients with advanced forms of MS who had failed to respond to other medications. However, the researchers noted that the nature of the treatment, which involves aggressive chemotherapy, carried “significant risks”.
It’s worth recapitulating here that MS is caused by the immune system malfunctioning and mistakenly attacking nerve cells in the brain and spinal cord, leading to problems with movement, vision, balance and speech. It’s a lifelong condition and often causes serious disability, with no cure still in sight. The disease is most commonly diagnosed in people in their 20s and 30s, although it can develop at any age.
A new hope with a game changing potential:
The above study of SC transplantation conducted by Imperial College London in MS, is just a recent example, among scores of major steps being taken in this frontier of medical science in preparation of a decisive battle against many more life-threatening and serious debilitating diseases.
No doubt that various treatments involving stem cells are generally considered a novel and rapidly advancing medical technology. However, in a small number of developed countries, such as the United States (US), a number medical procedures with stem cells are being practiced since around last three decades. Bone marrow transplant is the most widely used stem-cell therapy in this area, which was first performed in 1968.
According to California Institute for Regenerative Medicine (CIRM) and various other medical literature, SC treatment has the game changing potential for successful use to:
- Replace neurons damaged by spinal cord injury, stroke, Alzheimer’s disease, Parkinson’s disease or other neurological problems
- Produce insulin that could treat people with diabetes and heart muscle cells that could repair damage after a heart attack, or
- Replace virtually any tissue or organ that is injured or diseased
Thus, stem cells offer limitless possibilities, such as tissue growth of vital organs like liver, pancreas. Today there are many diseases for which no effective treatment still exists, besides giving symptomatic relief, such as Multiple Sclerosis, Parkinson’s disease, Alzheimer’s, severe burn, spinal cord injury. There is a host of other diseases, including several chronic ailments, such as diabetes, heart ailments, rheumatoid arthritis, or some types of cancer, which can’t just be reversed, however, could be managed with a lifelong treatment. For most of these diseases, and several others involving tissue degeneration, SC therapy has the potential to be a huge life and a game changer. It may involve, besides patients, several industries, including pharmaceuticals and biotech sectors.
Major stem cell sources and some key milestones:
Medical scientists and researchers have conclusively established that stem cells are the master cells of any human body. These are undifferentiated cells of the same lineage, retaining the ability to divide throughout life and grow into any one of the body’s more than 200 cell types. Some of the major sources of stem cells in the human body are bone marrow, cord blood, embryonic cells, dental pulp and menstrual blood.
As captured by ‘ExploreStemCells’ of UK, some key events in stem cell research include:
- 1978: Stem cells were discovered in human cord blood
- 1981: First in vitro stem cell line developed from mice
- 1988: Embryonic stem cell lines created from a hamster
- 1995: First embryonic stem cell line derived from a primate
- 1997: Cloned lamb from stem cells
- 1997: Leukemia origin found as hematopoietic stem cell, indicating possible proof of cancer stem cells
- 1998: University of Wisconsin isolated cells from the inner cell mass of early embryos and developed the first embryonic stem cell lines.
- 1998: Johns Hopkins University derived germ cells from cells in foetal gonad tissue; pluripotent stem cell lines were developed from both sources.
- 1999 and 2000: Scientists discovered that manipulating adult mouse tissues could produce different cell types. This meant that cells from bone marrow could produce nerve or liver cells and cells in the brain could also yield other cell types.
All these discoveries were exciting for rapid progress in the field of stem cell research, along with the promise of greater scientific control over stem cell differentiation and proliferation. Currently, many more research studies are underway in globally acclaimed institutions and other boutique laboratories exploring the possibility of wide scale use of SC therapy, even in the treatment of several chronic diseases, including diabetes and heart disorders.
A controversy:
The controversy related to SC research mainly involves Embryonic Stem Cells (ESC) and raises several difficult questions for a speedy resolution. As articulated by the ‘Genetic Science Learning Centre’ of the University of Utah, these are mainly:
- Does life begin at fertilization, in the womb, or at birth?
- Is a human embryo equivalent to a human child?
- Does a human embryo have any rights?
- Can destruction of a single embryo be justified to provide a cure for a countless number of patients?
- Since ESC can grow indefinitely in a dish and can, in theory, still grow into a human being, is the embryo really destroyed?
However, in 2006 scientists learned how to stimulate a patient’s own cells to behave like embryonic stem cells. These cells are reducing the need for human embryos in research and revealing exciting new possibilities for stem cell therapies, according to this Centre..........
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