The longevity-promoting NAD+-dependent class III histone deacetylase Sirtuin 1 (SIRT1) is involved in stem cell function by controlling cell fate decision and/or by regulating the p53-dependent expression of NANOG. We show that SIRT1 is down-regulated precisely during human embryonic stem cell differentiation at both mRNA and protein levels and that the decrease in Sirt1 mRNA is mediated by a m...

Beginning with the assumption that human life begins at conception, this article explores the problematic terrain accompanying embryonic stem cell research and human cloning. “Lethal Experimentation on Human Beings,” as enumerated in the article’s title, refers to experimentation on and the removal of stem cells from human embryos, both of which ”kill” a human being. The article warns that the ...

Imbalance in immune responses plays an indispensable role pathogenesis and development of multiple sclerosis (MS), as a neurodegenerative disorder. Current treatments are not always successful preventing MS treating the disease. Stem cell-based cell therapy has provided new window for disorders. cells can regulate system improve axonal remyelination. They be isolated from different origins such...

From cloning to political controversy, human embryonic stem cells consistently capture newspaper headlines. With remarkable regenerative abilities, stem cells theoretically possess the potential to replace any diseased or damaged tissue. Governments around the world are now encouraging their top stem cell experts to conduct their research at home. In 2006, Canada succeeded in enticing 35-year-o...

Cultures of human embryonic stem cell typically rely on protein matrices or feeder cells to support attachment and growth, while mechanical, enzymatic or chemical cell dissociation methods are used for cellular passaging. However, these methods are ill defined, thus introducing variability into the system, and may damage cells. They also exert selective pressures favouring cell aneuploidy and l...

PURPOSE The evidence is increasing that cancer stem cells (CSCs) expressing embryonic and neuronal stem cell markers are present in human retinoblastoma (Rb). This study was conducted to determine whether stem-like cancer cells (SLCCs) in Rb express retinal stem cell-related genes and whether SLCCs can directly differentiate into retinal neurons. METHODS The cancer stem cell characteristics i...

objective: the neural crest is a transient structure of early vertebrate embryos that generates neural crest cells (nccs). these cells can migrate throughout the body and produce a diverse array of mature tissue types. due to the ethical and technical problems surrounding the isolation of these early human embryo cells, researchers have focused on in vitro studies to produce nccs and increase t...

Stem cell therapies offer great promise for a wide range of diseases and conditions. However, stem cell research-particularly human embryonic stem cell research-has also been a source of ongoing ethical, religious, and political controversy.

introduction: to evaluate the camp -mediated ibmx (3-isobutyle -1-methyl xanthin) and db-camp (dibutyryl camp) effects on differentiation of human embryonic stem cells (hescs) into nerve cells were the objectives of this study. methods: we have used royan h1 hesc- derived embryoid bodies with four treatment groups: six days treatment with ibmx (5×10 -4m) and db-camp (10 -9m) (referred to as cam...

objective: micrornas (mirnas) are a new class of non-coding rnas involved in regulating various biological processes including proliferation, differentiation, and apoptosis, among others. alterations in mirna expression are reported in several human cancers, which suggests their potential roles in tumor initiation and progression. members of the mir-302 cluster are highly expressed in embryonic...