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【公司名稱】 廣州健侖生物科技有限公司
【】    楊永漢 
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在小鼠中進行的這項研究也顯示腎臟自我更新的能力。不是單一型的腎干細胞就可替換任何丟失或受損的腎臟組織，而是駐留在腎臟的不同部分稍微??更專門的干細胞產(chǎn)生每個類型的腎組織??內(nèi)的新細胞。
“這就像有分支的樹，其中每個分支考慮其自身的成長，而不是依賴于軀干的照顧，”德克爾說。
科學家還發(fā)現(xiàn)，這些細胞是通過一個名為Wnt蛋白的細胞通路的活化作出生長的決定。Rinkevich說，即使腎上皮細胞的數(shù)量看起來一樣，zui健壯腎臟形成能力可追溯到前體細胞中的Wnt信號被激活，并且只能生長為某些特定類型的腎組織。“這提示了Wnt信號是負責新腎組織的成長提供了一個治療目標，以通過促進或恢復腎臟的再生能力，”他說。“我們也許能夠打開Wnt信號通路產(chǎn)生新的腎臟形成細胞。”
研究人員說，這項研究發(fā)現(xiàn)對于科學家試圖在實驗室創(chuàng)造腎部分有著至關重要的影響。
然而，他們警告說，這樣的進步并不迫在眉睫。“為了在實驗室里長出整個腎臟是復雜的，因為我們需要協(xié)調(diào)許多不同種類的前體細胞的活性，” 德克爾說。“這不象血液和免疫系統(tǒng)可以從一種類型的干細胞再生。”
奧地利科學技術研究所(IST)的副教授Harald Janovjak，與維也納醫(yī)學大學癌癥研究學會的副教授邁克爾·格呂施，一起利用光“遙控”癌細胞的行為，相關文章發(fā)表于本周的EMBO雜志上。這項工作*將光遺傳學應用到癌癥研究的新領域。
為了解細胞信號的動態(tài)，研究人員需要將膜受體蛋白激活和使其失活，膜受體蛋白作為一個細胞內(nèi)外世界之間的中轉(zhuǎn)站。理想情況下，這種激活在短時間(幾秒到幾分鐘)以及近的目標位置(微米到毫米)內(nèi)發(fā)生。然而，如此高水平的活化精密度不能使用當前的藥理學和遺傳學的方法來實現(xiàn)。光遺傳學利用光來控制細胞的活性，以及具有在時間和空間上精確地被應用和移動(施加和除去)的優(yōu)點。Janovjak，格呂施和同事重新設計受體酪氨酸激酶(RTKs)，在光的控制下，感測生長因子和激素的必要的細胞表面受體。

This study, conducted in mice, also shows the kidney's ability to self-renew. Rather than a single type of kidney stem cell that replaces any lost or damaged kidney tissue, it resides in a slightly more specialized, more specialized stem cell that produces new cells within each type of kidney tissue.
"It's like a tree with branches, each of which takes into account its own growth, not its torso care," Decker said.
Scientists also found that these cells are the decision to grow through the activation of a cellular pathway called Wnt protein. Rinkevich said that even though the number of renal epithelial cells looks the same, the most robust kidney formation can be traced back to the activation of Wnt signaling in precursor cells and can only grow to certain types of kidney tissue. "This suggests that Wnt signaling is responsible for the growth of new kidney tissue and provides a therapeutic target to promote or restore the regenerative capacity of the kidneys," he said. "We may be able to turn on the Wnt signaling pathway to produce new kidney-forming cells."
The researchers said the study found a crucial impact on scientists trying to create parts of the kidney in the lab.
However, they warned that such progress is not imminent. "To grow an entire kidney in a lab is complicated because we need to coordinate the activity of many different kinds of precursor cells," Decker said. "It's not like the blood and the immune system can regenerate from one type of stem cell."
Harald Janovjak, an associate professor at the Austrian Institute of Science and Technology (IST), and Michael Gruissch, an associate professor at the Institute for Cancer Research at the University of Wien University, are using light to "control" cancer cells in an article published in this week's EMBO magazine. This work, for the first time, applies optogenetics to new areas of cancer research.
To understand the dynamics of cell signaling, researchers need to activate and inactivate membrane receptor proteins, which act as a transit site between the cell's inner and outer cells. Ideally, this activation occurs within short periods of time (seconds to minutes) and near target locations (micrometers to millimeters). However, such a high level of activation precision can not be achieved using current pharmacological and genetic approaches. Photogenetics uses light to control the activity of cells, and has the advantage of being precisely applied and moved (applied and removed) in time and space. Janovjak, Gruch and colleagues redesigned their receptor tyrosine kinases (RTKs) to sense the necessary cell surface receptors for growth factors and hormones under the control of light.