الرئيسية > السؤال
السؤال
ما هي الخلايا الجذعية ؟ و ما المراد فيها ؟
الطب | الأديان والمعتقدات | العلوم | الأحياء | الصحة 28‏/8‏/2011 تم النشر بواسطة جاسم المادح (Jassim Al-Madeh).
الإجابات
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،،،،،هي خلايا غير متخصصة قادرة على تكوين أي نوع من الخلايا الاخرى في الجسم بعد ان تنقسم في ظروف مناسبة (الخلايا الاولية التي ينشأ منها الكائن الحي ) فتعرف بخلايا المنشأ أحيانا ً (stem cells) ،،،،

وبالنسبة لانواعها 3 من حيث المنشأ والقدرة لكن أريد ان اكتفي بالاجابة على السؤالين ..

استخداماتها لمعالجة كثير من الامراض المستعصية مثل الباركنسون ،، والحروق ،، واصابات الحبل الشوكي ووووو غيرها كثير ،،،،

،،، وتستخدم ايضا ً للمساعدة في تعرف اسباب حدوث امراض مستعصية مثل السرطان والعيوب الخلقية وغيرها .....

لها مزايا ولها سلبيات ..... موضوع ممتع ،،، وعميق جدا
28‏/8‏/2011 تم النشر بواسطة nadia anis (Nadia anis).
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Stem cells are biological cells found in all multicellular organisms, that can divide (through mitosis) and differentiate into diverse specialized cell types and can self-renew to produce more stem cells. In mammals, there are two broad types of stem cells: embryonic stem cells, which are isolated from the inner cell mass of blastocysts, and adult stem cells, which are found in various tissues. In adult organisms, stem cells and progenitor cells act as a repair system for the body, replenishing adult tissues. In a developing embryo, stem cells can differentiate into all the specialized cells, but also maintain the normal turnover of regenerative organs, such as blood, skin, or intestinal tissues.

Stem cells can now be artificially grown and transformed into specialized cell types with characteristics consistent with cells of various tissues such as muscles or nerves through cell culture. Highly plastic adult stem cells are routinely used in medical therapies. Stem cells can be taken from a variety of sources, including umbilical cord blood and bone marrow. Embryonic cell lines and autologous embryonic stem cells generated through therapeutic cloning have also been proposed as promising candidates for future therapies.[1] Research into stem cells grew out of findings by Ernest A. McCulloch and James E. Till at the University of Toronto in the 1960s.[2][3]

There are three sources of autologous adult stem cells: 1) Bone marrow, which requires extraction by harvesting, that is, drilling into bone (typically the femur or illiac crest), 2) Adipose tissue (lipid cells), which requires extraction by liposuction, and 3) Blood, which requires extraction through pheresis, wherein blood is drawn from the donor, (similar to a blood donation) passed through a machine that extracts the stem cells and returns other portions of the blood to the donor.

Of all stem cell types, autologous harvesting involves the least risk. By definition, autologous cells are obtained from one's own body, just as one may bank his or her own blood for elective surgical procedures.  

العلاج
Medical researchers believe that stem cell therapy has the potential to dramatically change the treatment of human disease. A number of adult stem cell therapies already exist, particularly bone marrow transplants that are used to treat leukemia.[51] In the future, medical researchers anticipate being able to use technologies derived from stem cell research to treat a wider variety of diseases including cancer, Parkinson's disease, spinal cord injuries, Amyotrophic lateral sclerosis, multiple sclerosis, and muscle damage, amongst a number of other impairments and conditions.[52][53] However, there still exists a great deal of social and scientific uncertainty surrounding stem cell research, which could possibly be overcome through public debate and future research, and further education of the public.

One concern of treatment is the risk that transplanted stem cells could form tumors and become cancerous if cell division continues uncontrollably.[54]

Stem cells are widely studied, for their potential therapeutic use and for their inherent interest

Supporters of embryonic stem cell research argue that such research should be pursued because the resultant treatments could have significant medical potential. It has been proposed that surplus embryos created for in vitro fertilization could be donated with consent and used for the research.

The recent development of iPS cells has been called a bypass of the legal controversy. Laws limiting the destruction of human embryos have been credited for being the reason for development of iPS cells, but it is still not completely clear whether hiPS cells are equivalent to hES cells. Recent work demonstrates hotspots of aberrant epigenomic reprogramming in hiPS cells

اختصار

خلايا الجذعية هي الخلايا البيولوجية متعددة الخلايا توجد في جميع الكائنات الحية ، التي يمكن أن الفجوة (من خلال الانقسام ) ، و التفريق في مختلف أنواع الخلايا المتخصصة ، ويمكن تجديد الذاتي في إنتاج المزيد من الخلايا الجذعية. لخلايا الجذعية هي الخلايا البيولوجية متعددة الخلايا توجد في جميع الكائنات الحية ، التي يمكن أن الفجوة (من خلال الانقسام ) ، و التفريق في مختلف أنواع الخلايا المتخصصة ، ويمكن تجديد الذاتي في إنتاج المزيد من الخلايا الجذعية.
28‏/8‏/2011 تم النشر بواسطة The English Sam (Sam Hoky).
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