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  3. For the first time, stem cells purified from fat have been used to heal an injury in a living animal. Michael Longaker of Stanfo

For the first time, stem cells purified from fat have been used to heal an injury in a living animal. Michael Longaker of Stanfo

admin2014-02-27  56
问题     For the first time, stem cells purified from fat have been used to heal an injury in a living animal. Michael Longaker of Stanford University in California and his team showed in mouse experiments that so-called adipose derived adult stromal(ADAS)cells purified from a rodent’s belly fat could be coaxed to heal a skull fracture too large to mend by itself.
    The power of ADAS cells to transform into bone, cartilage and even neurons has been studied for years in test tubes. But Jeffrey Gimble, who studies human ADAS cells at Louisiana State University in Baton Rouge says Longaker’s report is an important step forward. "Actually repairing a defect in an animal model had never been done. This is an excellent study." If the same technique works in humans, these cells could be coaxed to mend broken bones and correct other defects in tens of thousands of surgical procedures each year in which bone grafts and prosthetics are now necessary.
    Longaker’s group tested the ability of ADAS cells to heal four-millimetre-long fractures surgically-induced in the skulls of mice. In 12 weeks, the cells filled 70 to 90 per cent of the defects, while untreated animals had only unorganized bone formation in less than 10 per cent of the fractures. No extreme genetic manipulation or treatment of the cells was necessary. ADAS cells began manufacturing bone when they were simply laid onto a biodegradable polymer that contained apatite, a compound that naturally occurs in bone. Furthermore, the ADAS cells performed as well as bone marrow stromal cells, which would seem to be more natural architects of bone. It remains to be seen whether human ADAS cells will build bone as effectively. But researchers are excited about the prospects. Human bone marrow stromal cells are already being used in clinical trials as sources of skeleton-building material, but the ADAS cells may have some significant advantages.
    Longaker reports that ADAS cells grow seven times faster than the bone marrow cells in the laboratory. And it is relatively easy to harvest more than a litre of fat tissue, even from patients who are not obese. Bone marrow is much less plentiful and must be removed in a painful surgical procedure. Of course, liposuction itself is not a pleasant operation. But according to the American Society of Plastic Surgeons, more than 300,000 people volunteered to have the procedure in 2003 simply for cosmetic reasons. "If the procedure was the first step to healing broken bones or replacing other tissue its popularity could only grow," says Gimble. "Just think of that."
The best title for the passage might be______.
选项 A、Bright Future of ADAS Cells
B、A Potential Repairing Technique
C、Advantaged ADAS Cells
D、Application of ADAS Cells
答案B
解析 这是一道主旨题。文章第一段提到了．ADAS细胞，介绍了它治愈骨折的作用，随后的段落分析了．ADAS细胞的诸多优点，指出，人类可能应用这种技术。这说明，本文主要讲的是治疗骨折的新技术。B说“一种可能的修补技术”，这可以表达文章的主题。A、C和D都只是文中部分段落的内容，不能表达文章的主题。
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