Monday, April 13, 2009
Here are the results from the survey I posted several weeks ago. Click on the link to view the breakdown of the multiple choice responses.
Click here for survey results.
The following are several of the answers to the questions that required a personal comments:
Question: Please describe, to the best of your ability, what you think embryonic stem cell research is and how it is done.
I think there are two main ways to apply stem cell research, regenerative medicine and also in the study of differentiation for use in examining pathways and gene therapies. Embryonic stem cell research is conducted by removing the inner cell mass from a blastula and culturing them.
Embryonic stem research is a done in a laboratory in some hospital, it is a method to assist in pregnancy and/or find remedies to genetic diseases.
Stem cells are taken from unwanted embryos (excess from IVF) that have been killed. Research is being performed on stem cells to find cures for diseases such as Parkinson's, where being able to regenerate new cells from the stem cells is needed. Embryonic stem cells can be triggered to differentiate into any type of cell needed, so embryonic stem cell research has the possibility of curing many, many diseases.
Embryonic stem cell research is when research is conduct with stem cells from embryonic cells which would be discard if it was not used for research. I am not quite sure how it is done, but the embryonic stem cells are used to group strands of other stem cells which could be used to replicate into any cell we would want it to become. For example a stem cell could be used to create nerve cells.
with embryonic research we can take the placenta and perform genetic experiments on it with the DNA. There are human cells present which allow us to manipulate the information present along with using the cells for research that could not be conducted productively on a false cell.
An either aborted or miscarried zygote or fetus has its stem cells extracted in order to use those stem cells to do medical research and perhaps help cure diseases and cancer.
Question: To the best of your ability, please describe what you think induced pluripotent stem (iPS) cells are and how they are made. If you don't know please write "I don't know"
Induced pluripotent stem cells come from differentiated cells which genes for stemness had been added via retroviruses and are induced to de-differentiate into stem cells.
I believe they are either adult stem cells that can be induced to become pluripotent, or they are cells that are somehow synthesized and induced to become pluripotent. This would allow them an ability similar to embryonic stem cells to differentiate into any type of cell needed.
Use of adult stem cells in a way that mimics the possible capabilities of embryonic stem cells.
20/33 Said they did not know
Question: For those that answer stated that they are opposed to iPS cells or are somewhat opposed to iPS cells Please describe some of your reasoning in the space below.
I didn't answer as either of those choices. I put does not apply because I don't really know enough about them!
I don't really know much about it but if it could help someone in a positive way im for it
Much of the responses included responses such as "I don't know enough about them", etc.
Thanks to everyone who participated. If you still have not completed the survey but would like to do so, you can find it here: Click Here to take survey
Sunday, April 12, 2009
6-8 cells stage embryos
Once the embryos reach this stage of division, a test called Pre Implantation Genetic Diagnosis can be done to determine if the embryos have any abnormalities by examining the chromosomes. The normal embryos are determined and then implanted back into the uterus. The sex of the embryos can also be determined and implanted according to the patients wish. Since the sex of the embryos can be determined, it makes me think that the embryo is a life right at the point of conception, but that it is just so minuscule to see, whereas when you see an image of a fetus growing you can easily see the shape of the baby.
However, through IVF clinics, the way they store the embryos and have them frozen and shipped makes me feel like storage places treat them as just something out of the ordinary, or just cell dividing in a petri dish. So I would think that if they are in IVF clinics and are treated as packaged material, then one who is for IVF treatment should be ok to discard their embryo and use it for research where it would have to be destroyed to remove the stem cells. I personally think the word “destroyed” makes it seem far worse then it is. I think maybe it should be said it is put to use and stem cells are extracted to use it for a different potentiality.
Curious FYI :How they freeze an embryo
The reason I show you this is because it makes me think that if a human embryo can be frozen and stored, then it makes it sort of inhumane if one was to think of it as a human life. The freezing and storing I think, would not constitute for the right manner of taking care of an embryo, even though they still have the potential of turning into a human if implanted in the womb. Thus, I think that an embryo is a group of cells that just like how the stem cells have the potential to turn into any different cell, it has different uses and potentials, like turning into a baby under the right circumstances, or potential for gaining information through research.
Tuesday, April 7, 2009
Social scientists have shown that in all societies, there is a correspondence between the biological and the social order. Everywhere, and throughout all periods, it is the individual who is sick, but they are sick in the eyes of their society in relation to, and in keeping with the manners fixed by it. The language surrounding the disease and the sick individual thus takes shape within the language expressing the relations between the individual and society. Over the last twenty years, we have seen an extraordinary growth of the medical establishment and an equally remarkable crisis of confidence with respect to it. These developments have had an impact on the sick, their self-image, and their behavior. The transformation of the very nature of the diseases over time, the development of medicine and the sudden linking of illness and work in the legal framework brought about by industrialization are all examples of the constant restructuring of illness and the sick, showing us that each society has its own way of letting the sick exist, defining them, and taking charge of them.
Embryonic stem cell development exhibits a tremendous amount of promise with respect to treating many illnesses and diseases, some of which offer no cures currently. However, I can also see how these innovations may bring negative implications on our society, particularly individuals who are currently inflicted by a certain disease. As someone already pointed out, there have been recent developments which have demonstrated how stem cells have contributed to the cure of deafness. However, how might this new development influence others who do not wish to seek treatment and may not consider their condition to be a disability? Furthermore, how will this affect individuals with these condition who desire the treatment but simply do not possess the means to obtain the procedure? How might this change the way our society views the diseased and people with disabilities and the conditions associated with individuals who exhibit them. Will people inflicted become more readily discriminated against and how might it influence the Americans with Disabilities Act of 1990 if embryonic stem cell provides treatment for existing diseases. Bush’s approval of funding for limited embryonic stem-cell research with his concurrent praise of the American’s with Disabilities Act took many people by surprise. His consent to allow federal funding to take action towards curing and possibly even eliminating disabilities from society seems to many as completely countering the progress the ADA which has taken over eleven years to establish. With some even claiming this to be eugenics, they fear this may be jeopardizing the livelihood of the advancement and progressive reform that has been made from laws protecting those with disabilities.
In addition, it's important to consider how these innovations may also influence the non diseased or disabled. Nearly 46 million Americans, or roughly 18% of the population under the age of 65 were without health insurance between they years of 2007 and 2008 and that number is predicted to increase. Is it possible that this promising innovation may actually make it more difficult for average citizens to obtain health coverage?
An interesting quote I stumbled upon:
When scientists talk about curing the usual swathe of conditions, including spinal cord injuries, Alzheimer's and Parkinson's disease, they often take a warped view of living life with a disability. Not only may they describe such conditions as an intolerable burden for society but some are as arrogant as to foreshadow that "we may be able to produce a whole generation of people who have a pretty good quality of life right up until they die (Professor Rathen, "Laws hamper stem cell research", The Australian, September 2, 2005)
With regards to their unspecialized characteristic, stem cells have the ability to proliferate many times unlike other cells. These cells do not contain any tissue-specific structures that force it to have specialized functions; however, they do have the ability to produce specialized cells, a process called differentiation.
There are three types of stem cells which include embryonic stem cells, adult stem cells, and induced pluripotent stem cells.
Embryonic stem cells are derived from four to five day old embryos, or fertilized eggs. This structure is also known as a blastocyst and can be divided into the trophoblast, blastocoel, and inner cell mass. The inner cell mass is where the stem cells are located. To access the stem cells, the scientist would need to destroy the embryo and transfer the inner cell mass into a culture medium. Embryonic stem cells have the ability to differentiate into any type of cell in the body, thus they are pluripotent cells. Additionally, they are very easily grown in culture.
An adult stem cell is an undifferentiated cell that is found in a specific tissue among other differentiated cells. These stem cells can create specialized cells types of the tissue in which they reside. There is a very small number of adult stem cells that are located in the stem cell niche where they remain quiescent for years until they are needed to divide. "These cells have a limited capacity for proliferation, thus making it difficult to generate large quantities of these cells in the laboratory." Adult stem cells are primary used for repair and maintenance mechanisms of the cell. Currently, adult stem cells have been reported in the brain, bone marrow, peripheral blood, blood vessels, skeletal muscle, skin, intestine, teeth, heart, gut, liver, ovarian epithelium, and testes. Adult stem cells are limited to the cell types of their tissue of origin. Since there are very few of them in the stem cell niche, they are relatively rare, harder to isolate and they have a limited ability to proliferate which greatly reduces the ability to effectively produce a large number of cells needed for stem cell replacement therapies.
Finally, induced pluripotent cells (iPS) are "adult cells that have been genetically reprogrammed to an embryonic stem cell-like state by being forced to express genes and factors important for maintaining the defining properties of embryonic stem cells." The cells clinical ability compared to embryonic stem cells is currently unknown and needs more research. With research done from mouse iPS cells, they have shown characteristics of pluripotent stem cells such as their ability to express stem cell markers, form tumors from all three germ layers, and contribute to make different tissues.
Stem cells have many different potential uses. They gave scientists more information about the complexity of development among humans. Scientists now know that the key to identifying how undifferentiated stem cells become differentiated is through the process of turning genes on and off. Additionally, most of the serious medical concerns today such as cancer and birth defects are related to cell division and differentiation. Stem cells would help scientists have a better grasp as to what is happening and what type of treatment may be useful with the help of stem cells. Stem cells are also important to test new drugs. They would allow scientists to test the drugs on the cells rather then a person. Finally, human stem cells could be used for cell-based therapies such as transplants. Now days, there are a limited number of available organs for the numerous people that need organ transplants. Stem cells would allow scientists to grow cells to repair the damaged organs. Since the scientists would be using the individuals own stem cells, then the risk of rejection is eliminated since it is their own cells in the first place.
Here is a basic diagram to show the differences of how embryonic and adult stem cells are created. It also shows the other forms of stem cells but unfortunately, iPS cells are not included.
This website gives a nice interactive introduction to the different types of stem cells.
Sunday, April 5, 2009
One of the afflictions that scientists recently found a link to stem cells is deafness. Deafness usually involves the loss of sensory receptors, labeled as hair cells because of their clumps of hair like protrusions and their related neurons. But as of March 29, 2009, Scientists from Sheffield University in the United Kingdom found stem cells that could be used to reverse this hearing loss. They were able to take stem cells from fetuses and change them to behave like early versions of the sensory hair cells and neurons in the human inner ear. These cells would assist scientists in advancing the technologies needed to transport them into damaged tissues, such as the cochlea, in order to restore the different cell types. This discovery could eventually help those people who have lost these sensory hair cells through noise damage or even some people who were born with hearing problems. So in all, scientists would be developing a treatment for deafness.
According to Dr. Rivolta, “these stem cells were taken from the developing cochleas of discarded human fetuses aged 9 to 11 weeks.” Dr. Rivolta’s team grew the cells in the laboratory and “more than half of them displayed the electrical and physical features of sensory hair cells which turn sound waves into nerve impulses. Other cells showed the properties of auditory neurons which transmit hearing messages to the brain.”
Scientists were exhilarated by being able to make neuron and hair cells because these cells were originally only created in the womb making it impossible to treat people who have lost these cells. This meant that curing deafness was unattainable.
As indicated by the BBC news article, “Currently, hair cell damage is irreversible and causes hearing problems in some 10% of people worldwide.” But embryonic stem cells can change this because they have the capability of becoming any human cell.
According to Dr. Ralph Holme, director of biomedical research at the Royal National Institute for Deaf and Hard of Hearing People said, “Stem cell therapy for hearing loss is still some years away but this research is incredibly promising and opens up possibilities by bringing us closer to restoring hearing in the future.” The exciting news about treatment for hearing loss is still at least ten years away. Along with Dr. Rivolta, the next step in the deafness treatment research is to look at how these cells respond when implanted into animal models. In the end, everyone hopes they may propose a path to restoring hearing for patients. Even though scientists still have many years of researching treatments for hearing loss, it is very exciting that they have come this far in treating hearing loss that was thought to be irreversible.
Embryonic stem cell research has been debated since its creation, the controversial issue heated by the underlying topic regarding the beginning of life. The debate remains unresolved and is becoming increasingly complex, however, as new technologies are presented. Most recently in the United Kingdom, legislation has been passed to allow a new form of technology for deriving embryonic stem cells. With the legislation, stem cells can be acquired by fusing the e-nucleated eggs of cows with the somatic nuclei of humans. These human-to-animal embryonic chimeras often referred to as human-cow hybrids, have a genetic composition that is approximately 99% human and 1% bovine. The techniques, developed to evade a shortage of human eggs, are promising to researchers hoping to make advances in regenerative medicine, and therefore, harness the potential to lessen the suffering of millions around the world. Given this context, I will be arguing that there is currently, no concrete argument for limitations on embryonic stem cell research via human-to-animal embryonic chimeras, and in the following, hope to shine a light onto the common misconceptions instilled in many by societal constructs and norms.
When considering human-to-animal embryonic chimeras, it is important to note that the debate no longer revolves around what people believe to be the beginning of life, but instead on the morality of combining genetic material of humans with that of other animals. Interspecies chimeras are not a new practice, however. Animal-to-animal embryonic chimeras are regularly created within the laboratory setting, so the issue at hand is not that of simply crossing genetic material between different species, but specifically crossing human genetic material with another species. Those who oppose this new technology do so on the grounds of repugnance and fear, neither of which hold any valid weight in ethical debate.
The commonly held Western view, known as the Great Chain of Being, establishes a hierarchy at which God is at the top, followed by angels, human beings, animals, and lastly plants. While this view is declining in popularity with time, it is still deeply engrained within our culture, and clearly sets humans apart from all other organisms. Along these same lines, human beings are often given a privileged place based on our higher cognitive capabilities, such as language and reason. But are such abilities truly grounds to make this distinction? To make such an argument, one would have to establish guidelines for species identification. Many assume species boundaries to be determined by fixed characterizations. Evolution being a fluid process, however, debunks this misconception. (Robert, 2003) With evolution discrediting the notion of fixed species boundaries, one cannot argue against interspecies hybrids based on categorizations that, in reality, don’t exist.
Another common objection is based upon the moral confusion introduced by creating a being with no defined moral status. Just previously we established that, scientifically speaking, there is no such thing as fixed species boundaries. Regardless of this fact, however, we still rely on this notion in a moral context when making decisions on how to treat creatures that differ from us, whether from what we eat to what we experimentally manipulate. It is a generally held worldview that human beings have a heightened moral status over other animals. When creating a being that mixes two organisms of different moral statuses, however, we are faced with defining how human a being has to be to accredit it with full moral status. Individuals who oppose human-to-animal embryonic chimeras, based on this uncertainty, do so out of fear because such a being would force us to revisit our current behaviors towards certain human and nonhuman animals. This is not the first time we have been faced with having to determine the moral status of a being, however. Just as we resolved the moral status of beings that are undeniably human (women, African Americans, and the like), we can rest assure that the same will be resolved for any beings we create. (Robert, 2003)
There are a multitude of other objections that appear to be variations of the ones discussed above. Accepting that species boundaries are social constructs rather than scientific truths, however, refutes the majority of these objections. By recognizing evolution as a fluid process in which species are ever changing, we have no reason to limit technology that harnesses potential to lessen the pain and suffering of all beings around the world.
Robert, Jason Scott. (2003). Crossing Species Boundaries. The American Journal of Bioethics, Volume 3, Number 3, Summer 2003, pp. 1-13. Retrieved on March 31st, 2009 from http://muse.jhu.edu.proxy1.cl.msu.edu/journals/american_journal_of_ bioethics/v003/3.3robert.pdf
Saturday, April 4, 2009
Lifting of embryonic stem cell funding ban gives families more options
With the new lift off the ban from George W. Bush, the new stem cell policy by President Barack Obama allows for patients of IVF treatment to decide what they wish to do with the remaining of their embryos, whether they wish to save or discard them, or give them to research.
Amy Birney, a patient from IVF had resulted in just donating her remaining embryos to her doctor where he froze the embryos and put them in storage, since at the time under the previous policy, she could not donate her embryos for stem cell research.
A couple said they had five options. "Well, one, we could have used them to have a third child, the potential of a third child. We could have destroyed them, not used them and … have them thawed and put away. We could have donated them to another couple who's having reproductive difficulties and wants to have a baby. We could continue to do nothing. Or we could donate them to medical research."
Julie Robichaux, 38, and just one of the thousands of former infertility patients said, “(As an IVF patient) you know what your embryo can become. You know the actual, not just the potential.” She argues that the patients themselves have the final say about whether to donate their embryos to another family, to research, or to discard them, and that IVF patients realize the struggle of what to do with the remaining embryos. She also says "No one comes to IVF without a great soul searching and examination of our own morals. So for the government to take the choice away from us is extremely upsetting," she said.
( http://www.msnbc.msn.com/id/29621284/ )
What should people do with their unused embryos?
There are about 300,000 frozen embryos that have been stored in the United States in 2003. The estimate now has risen to approximately around to 500,000, according to the American Society for Reproductive Medicine.
If unused embryos are not given to research, they are usually treated as biological waste and disposed of through incineration. Different IVF clinics have different options for the disposal of their embryos. IVF clinics usually need to have consent from the couple to dispose of it. Out of 175 IVF clinics surveyed in, the majority allowed couples to attend the disposal, while few even offered it to the patients.
This new overturn of the research policy gives the study for embryonic stem cells to continue and be federally funded. This gives the research community the supplies to now potentially catch up to the successful trials of using adult stem cells.
This article points out the fact that the patients are the ones that have a say in what happens to the remaining of their embryos. he way that patients can choose what to do with their remaining embryos that are not implanted in a woman’s womb is what I believe justifies the “destruction” of a human embryo after it has been created in an IVF clinic, and has been donated to research.
I think these two articles are important, since it in a way seems to put the moral dilemma to an ease over the destruction vs. the discarding of their embryos. It shows both sides, that sometimes the patients who donated want to take the embryos home and treat them as if they were human, but also gives others the choice of giving them to research that may benefit from such research instead of just freezing the embryos and letting them sit like they have for the past 8 years. I think that by having allowed the use of these “extra” embryos in the passed years would have speeded up the research.
I’m glad that there is finally a potential in the research of using embryonic stem cells and I think it will encourage researchers to show the benefits after certian trial and errors. The only thing that worries me is that the move from the thought of destroying embryos in the first place for research will now move to the concerns with experiencing the potential benefits by treating and testing the results on real humans in which puts the harm on real living people. But I understand that the only way to know if the stem cells work is through such trials.