Navigation Links
Only A Few Differentiating Factors Between Adult And Stem Cells

Researchers have successfully directed cells taken from mouse embryos or adult mice to behave like stem cells by using just four differentiating factors. The details appear// in an immediate early publication of the journal Cell. Researchers said the newly formed cells called "induced pluripotent stem cells" (iPS) behaved physically and genetically as stem cells.

"Human embryonic stem cells might be used to treat a host of diseases, such as Parkinson's disease, spinal cord injury, and diabetes," said Shinya Yamanaka of Kyoto University in Japan. "However, there are ethical difficulties regarding the use of human embryos, as well as the problem of tissue rejection following transplantation into patients."

Those problems could be circumvented if pluripotent cells could be obtained directly from the patients' own cells.

"We have demonstrated that pluripotent stem cells can be directly generated from fibroblast cultures by the addition of only a few defined factors," Yamanaka said. Fibroblasts make up structural fibers found in connective tissue.

Embryonic stem cells are derived from inner cells of the mammalian blastocyst, a ball of cells that develops after fertilization and goes on to form a developing embryo. Cells from other parts of the body can also be "reprogrammed" by transferring their nuclear contents into egg cell precursors called oocytes or by fusion with embryonic stem cells, earlier studies showed.

Those findings provided evidence that unfertilized eggs and embryonic stem cells contain factors that can confer pluripotency to differentiated cells, Yamanaka said.

"We hypothesized that the factors that play important roles in the maintenance of embryonic stem cell identity also play pivotal roles in the induction of pluripotency" in other body cells, he explained.

The researchers selected 24 genes--all previously found to play a role in early embryos and embryonic stem cell identity--as candidate factors that might give body cells the ability to become other cell types.

The researchers found that four of those factors, known as Oct3/4, Sox2, c-Myc, and Klf4, could lend differentiated fibroblast cells taken from embryonic or adult mice the pluripotency normally reserved for embryonic stem cells.

They further reported that transplantation of the iPS cells under the skin of mice resulted in tumors containing a variety of tissues representing the three primary types found in mammalian embryos. Those primary "germ layers" in embryos eventually give rise to all an animal's tissues and organs.

Following injection into blastocysts, iPS cells also contributed to mouse embryonic development.

"The finding is an important step in controlling pluripotency, which may eventually allow the creation of pluripotent cells directly from somatic cells of patients," Yamanaka said.

While the findings could have wide applications, stem cell experts caution that the study of embryonic stem cells has much further to go.

"We still do not know whether the four factors can generate pluripotent cells from human somatic cells," Yamanaka said. Use of c-Myc, a gene implicated in many human cancers, may not be suitable for clinical applications, they added, and the process may require specific culture environments. It also remains unclear whether iPS cells can do everything that embryonic stem cells can.

Source: Eurekalert
'"/>




Related medicine news :

1. Risk Factors for vision problems in Diabetes
2. Age-Related Macular Degeneration - Risk Factors
3. Factors That Might Increase The Risk Of Schizophrenia
4. Evaluating The Risk Factors Of Osteoporosis
5. Risk Factors For Stroke Studied
6. Analyzing The Risk Factors For Diabetic Neuropathy
7. Heart Disease Risk Factors Found To Increase Risk of Dementia In Old Age
8. Environmental Factors Found To Have An Impact On The Sex of A Child
9. Environmental Factors Found To Have An Impact On The Sex of A Child
10. Prostate Cancer Test Is Influenced By Age and Nutrition Factors
11. Youth Smoking Sparked By Multiple Factors: Study
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:6/26/2017)... ... 2017 , ... Maryland’s soybean farmers have improved the sustainability ... the United Soybean Board. , Thanks to the responsible use of technology ... on less land per bushel, the report says. The United Soybean Board’s “Soy ...
(Date:6/26/2017)... ... June 26, 2017 , ... New patients with missing ... Cotey, with or without a referral. Dr. Cotey is a trusted dentist who has ... tooth replacement option. , Patients with missing teeth in Fitchburg, WI, are encouraged to ...
(Date:6/25/2017)... ... ... CareSet Labs released the Root NPI Graph today at the 2017 Academy ... of the Doctor Referral teaming dataset commonly available from Medicare. , Originally created through ... “Doctor Referral Dataset” as released by Medicare and “DocGraph” as released by Trotter, the ...
(Date:6/24/2017)... ... June 24, 2017 , ... Dr. Mitchell Mehlman ... Road in Lake Ronkonkoma, Dental365 offers patients high-quality and affordable routine and emergency ... the dentist fit into their patients’ busy lifestyles. Dental365 also gladly work with ...
(Date:6/23/2017)... ... ... By scoring 100% for fiscal management and accountability, the Arthritis National Research ... Charity Navigator, validating ANRF's work as a top charity in America. , This achievement ... earns ANRF a spot on their “ 10 Charities Worth Watching ” list as ...
Breaking Medicine News(10 mins):
(Date:6/20/2017)... CHICAGO , June 19, 2017  Hill-Rom Holdings, Inc. ... conference call and webcast on Friday, July 28, 2017, beginning ... Conference Call Audio Only Dial-in information: To participate in the ... Please dial into the call at least 10 minutes prior ... Code is 34090339.  ...
(Date:6/16/2017)... -- Datascope Corp. is voluntarily performing a worldwide field correction of certain Intra-Aortic ... code.     ... NUMBER ... 0998-UC-0446HXX; 0998-UC-0479HXX 0998-00-3013-XX;  0998-UC-3013-XX ... This field correction also applies to any System ...
(Date:6/14/2017)... , June 14, 2017  ivWatch LLC, a medical ... of intravenous (IV) therapy, is pleased to announce it ... of Nonsurgical Hospital Supplies and Equipment at the 2017 ... for the medtech industry. The award was presented by ... K. Javits Center in New York ...
Breaking Medicine Technology: