More on Tissue Engineering of Bone Marrow
From the Economist: "tissue engineers have mastered the arts of artificial skin and bladders, and recently they have managed to rig up a windpipe for a patient whose existing one was blocked. But more complicated organs elude them. And simpler ones, too. No one, for instance, has managed to grow bone marrow successfully. At first sight, that is surprising. The soft and squishy marrow inside bones does not look like a highly structured tissue, but apparently it is. That does not matter for transplants. If marrow cells are moved from one bone to another they quickly make themselves at home. But it matters for research. Bone marrow plays an important role in the immune system, and also in bodily rejuvenation. Stem cells that originate within the marrow generate various sorts of infection-fighting blood cells and also help to repair damaged organs. However, many anti-cancer and anti-viral drugs are toxic to marrow. That leaves patients taking them susceptible to disease and premature ageing. Experiments intended to investigate this toxicity using mice have proved unsatisfactory. Nicholas Kotov of the University of Michigan in Ann Arbor and his colleagues have therefore been trying to grow human marrow artificially."
Link: http://www.economist.com/science/tm/displaystory.cfm?story_id=12883495