BETHESDA, MD July 6, 2012 Yona Goldshmit, Ph.D., is a former physical therapist who worked in rehabilitation centers with spinal cord injury patients for many years before deciding to switch her focus to the underlying science.
"After a few years in the clinic, I realized that we don't really know what's going on," she said.
Now a scientist working with Peter Currie, Ph.D., at Monash University in Australia, Dr. Goldshmit is studying the mechanisms of spinal cord repair in zebrafish, which, unlike humans and other mammals, can regenerate their spinal cord following injury. On June 23 at the 2012 International Zebrafish Development and Genetics Conference in Madison, Wisconsin, she described a protein that may be a key difference between regeneration in fish and mammals.
One of the major barriers to spinal regeneration in mammals is a natural protective mechanism, which incongruously results in an unfortunate side effect. After a spinal injury, nervous system cells called glia are activated and flood the area to seal the wound to protect the brain and spinal cord. In doing so, however, the glia create scar tissue that acts as a physical and chemical barrier, which prevents new nerves from growing through the injury site.
One striking difference between the glial cells in mammals and fish is the resulting shape: mammalian glia take on highly branched, star-like arrangements that appear to intertwine into dense tissue. Fish glia cells, by contrast, adopt a simple elongated shape called bipolar morphology that bridges the injury site and appears to help new nerve cells grow through the damaged area to heal the spinal cord.
"Zebrafish don't have so much inflammation and the injury is not so severe as in mammals, so we can actually see the pro-regenerative effects that can happen," Dr. Goldshmit explained.
Studies in mice have found that mammalian glia can take up the same elongated shape, but in response to
|Contact: Phyllis Edelman|
Genetics Society of America