fast health 40

It is mind-boggling t o imagine how our brain develops from just a handful of cells at the early embryo into a highly convoluted biochemical and bioelectric system comprising more than 100 billion neurons in adults. Scientists at the Institute of Molecular Biotechnology (IMBA) in Vienna have published new research in  EMBO Journal , in which they reveal how cells are instructed by a small RNA molecule to shape the complex layered structures of developing mouse brains. When stem cells divide to form new tissues and organs, they have to position their cell division apparatus in a specific orientation to position their daughter cells at sites where they experience different fate cues defining their subsequent function. The newly formed cells may then go on to take a specialised function -- in the brain, for example, they can become various types of neurons to generate and transmit electrical impulses -- or stay stem cells that will keep dividing to generate more cells. Failure to ...

A study at The University of Texas MD Anderson Cancer Center believes their survival may be due to deficiency of a tumor suppressor gene called quaking (QKI), a potential new target for therapies. Findings from the study, led by Jian Hu, Ph.D., assistant professor of the Department of Cancer Biology, were published in the Nov. 14 online issue of  Nature Genetics . "Cancer stem cells require 'niches' to remain viable but it is unclear how they survive in an environment outside of these niches both within the same tissues or during invasion to other organs," said Hu. "We discovered that QKI is a major regulator of these cancer stem cells in glioblastoma, the deadliest type of brain tumor." "Evidence is emerging that some brain cancer cells called glioma stem cells possess an inexhaustible ability to self-renew and produce tumors that resemble the features of original tumors," said Hu. Self-renewal is a unique feature of all stem cells tha...

Now, researchers at the Texas A&M College of Medicine have found that these dormant tumor cells might have become latent because they cannibalized -- basically ate -- the body's own stem cells. The study was published this month in the  Proceedings of the National Academy of Sciences  ( PNAS ). The team had been working on teaching adult stem cells from bone marrow, called mesenchymal stem/stromal cells (MSCs), to fight cancer when they noticed that the MSCs were disappearing from the cell cultures. "We actually thought we made a mistake or were witnessing an anomaly or negative result, " said Thomas J. Bartosh, PhD, assistant professor at the Texas A&M College of Medicine and first author of the study. "We eventually realized that the breast cancer cells were eating the stem cells. What was really interesting was what happened next: The breast cancer cells that had taken in the stem cells went dormant -- essentially became 'sleepy' -- but at t...

Two fluorescent microscopy pictures of intestinal organoids rising in artificial hydrogels. Credit score: N. Gjorevski/EPFL EPFL scientists have developed a gel for rising miniaturized physique organs that can be utilized in medical diagnostics and drug improvement. Organoids are miniature organs that may be grown within the lab from an individual's stem cells. They can be utilized to mannequin ailments, and sooner or later may very well be used to check medicine and even exchange broken tissue in sufferers. However at present organoids are very troublesome to develop in a standardized and managed manner, which is essential to designing and utilizing them. EPFL scientists have now solved the issue by growing a patent-pending "hydrogel" that gives a totally controllable and tunable solution to develop organoids. The breakthrough is printed in  Nature . Organ...

The study is published in the journal  Cancer Research . The brain is composed mainly of two types of cells ; neurons and supportive cells called glial cells. Glioma are brain tumors that are similar to glial cells and in adults malignant glioma is the most common form of primary brain tumor. In children malignant glioma is relatively rare, but, as for adults, the prognosis is very poor, and of all childhood cancers malignant glioma is among the most lethal. Malignant glioma in children is much less studied than in adults and to improve the possibilities to find efficient drugs more knowledge and relevant disease models are needed. Also, most studies in the field have been focused on the genetics of the disease and there is a lack of knowledge about in which cell type the tumor has originated and how this particular cell type affects the properties of the tumor. This is exactly what the researchers have investigated in the present study where they have used mouse models of gl...

Study findings were published in the Nov. 17 online version of  Cell . Co-authors included Baoli Hu, Ph.D., senior research scientist, Y. Alan Wang, Ph.D., associate professor, and Ronald A. DePinho, M.D., professor, all of Cancer Biology, and Qianghu Wang Ph.D., Bioinformatics and Computational Biology. "The poor prognosis of glioblastoma relates to the near universal recurrence of tumors despite robust treatment including surgery, radiotherapy and chemotherapy," said Hu. "Our study shows the potential for a new therapeutic strategy based on targeting the mechanisms allowing glioma to re-grow aggressively in the brain." Hu and his colleagues developed a glioblastoma model to locate glioma stem cells, which, like all stem calls, have the ability to become other cell types. The researchers further found that the gene, WNT5A, when activated, allowed glioma stem cells to transition, leading to invasive tumor growth. "We uncovered a process by which glioma ...

This can be a methylated DNA molecule. DNA methylation perform s an vital function for epigenetic gene regulation in improvement and most cancers. Credit score: Christoph Bock/CeMM Scientists have established complete maps of the human epigenome, shedding gentle on how the physique regulates which genes are lively wherein cells. During the last 5 years, a worldwide consortium of scientists has established epigenetic maps of two,100 cell sorts. Inside this coordinated effort, the CeMM Analysis Heart for Molecular Drugs contributed detailed DNA methylation maps of the growing blood, opening up new views for the understanding and remedy of leukemia and immune ailments. One of many nice mysteries in biology is how the numerous completely different cell sorts that make up our our bodies are derived from a single cell and from one DNA sequence, or genome. Now we have discovered ra...

The determine exhibits calcium deposits within the hearts of mice (A,D ) and the impact of two medicine, ARL67156 (B,E) and etidronate (C,F), in lowering the extent of calcium deposits after coronary heart harm. Credit score: Pillai and Li et al./Cell Stem Cell 2016 Connective tissue cells within the coronary heart flip into bone-producing cells in response to harm, College of California, Los Angeles scientists report November 17 in  Cell Stem Cell . The invention helps clarify why some individuals who survive coronary heart injury develop irregular calcium deposits -- the primary part of bone -- within the valves or partitions of the center. The researchers additionally present that coronary heart calcification may be prevented in mice by blocking an enzyme that regulates bone mineralization with small molecules. Tissues outdoors of the bones do not naturally calcify, but ...

The study is a major step toward understanding and one day treating pulmonary fibrosis , which affects about 100,000 people in the U.S. The disease often is called idiopathic pulmonary fibrosis because, in most cases, the cause cannot be found. While the prognosis is unpredictable, patients typically survive only three to five years after diagnosis, according to the U.S. National Library of Medicine. "Pulmonary fibrosis slowly robs patients of breath and finally life," said Paul W. Noble, MD, professor and chair of the Department of Medicine and director of the Women's Guild Lung Institute at Cedars-Sinai. "In our study, we identified novel potential pathways to finding treatments for this relentless disease." Noble was the study's principal investigator. The investigators focused on alveoli, the small air sacs at the ends of lung airways. In the alveoli, oxygen and carbon dioxide are exchanged with blood during respiration. Epithelial cells that line ...

An international study led by scientists from the Crick Institute in London and the Hebrew University of Jerusalem revealed a survival mechanism in cancer cells that allows the disease to erupt again even after aggressive treatment. In a paper published in  Science  the researchers describe the mechanism by which cancer tumor cells become cancer stem cells that can sustain long-term growth. When cancer develops, the generated cells are not uniform in their biological properties and contribute differently to tumor development. Only a small portion of cancer cells can form new tumors or metastases, and these are called "cancer stem cells." This disparity between tumor cells poses major challenges in understanding the nature of the tumor, its sensitivity to drugs, and planning an effective treatment that will eliminate all tumor cells. "Many chemotherapy drugs leave a small amount of cancer stem cells that cause a renewed outbreak of the disease after a few years. It ...