New animal research reveals fundamental sex differences in how pain is processed.
New research released today in Nature Neuroscience reveals for the first time that pain is processed in male and female mice using different cells. These findings have far-reaching implications for our basic understanding of pain, how we develop the next generation of medications for chronic pain–which is by far the most prevalent human health condition–and the way we execute basic biomedical research using mice.
“Research has demonstrated that men and women have different sensitivity to pain and that more women suffer from chronic pain than men, but the assumption has always been that the wiring of how pain is processed is the same in both sexes,” said co-senior author Jeffrey Mogil, Ph.D., E.P. Taylor Professor of Pain Studies at McGill University and Director of the Alan Edwards Centre for Research on Pain. “The realization that the biological basis for pain between men and women could be so fundamentally different raises important research and ethical questions if we want to reduce suffering.”
The research was conducted by teams from McGill University, The Hospital for Sick Children (SickKids), and Duke University, and looked at the longstanding theory that pain is transmitted from the site of injury or inflammation through the nervous system using an immune system cell called microglia. This new research shows that this is only true in male mice. Interfering with the function of microglia in a variety of different ways effectively blocked pain in male mice, but had no effect in female mice
According to the researchers, a completely different type of immune cell, called T cells, appears to be responsible for sounding the pain alarm in female mice. However, exactly how this happens remains unknown.
“Understanding the pathways of pain and sex differences is absolutely essential as we design the next generation of more sophisticated, targeted pain medications,” said Michael Salter, M.D., Ph.D., Head and Senior Scientist, Neuroscience & Mental Health at SickKids and Professor at The University of Toronto, the other co-senior author. “We believe that mice have very similar nervous systems to humans, especially for a basic evolutionary function like pain, so these findings tell us there are important questions raised for human pain drug development.”
The discovery comes as there is increased attention to the inclusion of female animals and cells in preclinical research. The U.S. National Institutes of Health recently unveiled a new policy, similar to one already in force in Canada, to require the use of female animals and cell lines in preclinical research.
“For the past 15 years scientists have thought that microglia controlled the volume knob on pain, but this conclusion was based on research using almost exclusively male mice,” said Mogil. “This finding is a perfect example of why this policy, and very carefully designed research, is essential if the benefits of basic science are to serve everyone.”
About this neurology and pain research
Funding: This work was supported by grants from the Canadian Institutes of Health Research, the Louise and Alan Edwards Foundation, the U.S. National Institutes of Health and SickKids Foundation.
Source: Chris Chipello – McGill Image Credit: Image is adapted from the McGill press release Original Research:Abstract for “Different immune cells mediate mechanical pain hypersensitivity in male and female mice” by Robert E Sorge, Josiane C S Mapplebeck, Sarah Rosen, Simon Beggs, Sarah Taves, Jessica K Alexander, Loren J Martin, Jean-Sebastien Austin, Susana G Sotocinal, Di Chen, Mu Yang, Xiang Qun Shi, Hao Huang, Nicolas J Pillon, Philip J Bilan, YuShan Tu, Amira Klip, Ru-Rong Ji, Ji Zhang, Michael W Salter and Jeffrey S Mogil in Nature Neuroscience. Published online June 29 2015 doi:10.1038/nn.4053
Different immune cells mediate mechanical pain hypersensitivity in male and female mice
A large and rapidly increasing body of evidence indicates that microglia-to-neuron signaling is essential for chronic pain hypersensitivity. Using multiple approaches, we found that microglia are not required for mechanical pain hypersensitivity in female mice; female mice achieved similar levels of pain hypersensitivity using adaptive immune cells, likely T lymphocytes. This sexual dimorphism suggests that male mice cannot be used as proxies for females in pain research.
“Different immune cells mediate mechanical pain hypersensitivity in male and female mice” by Robert E Sorge, Josiane C S Mapplebeck, Sarah Rosen, Simon Beggs, Sarah Taves, Jessica K Alexander, Loren J Martin, Jean-Sebastien Austin, Susana G Sotocinal, Di Chen, Mu Yang, Xiang Qun Shi, Hao Huang, Nicolas J Pillon, Philip J Bilan, YuShan Tu, Amira Klip, Ru-Rong Ji, Ji Zhang, Michael W Salter and Jeffrey S Mogil in Nature Neuroscience. Published online June 29 2015 doi:10.1038/nn.4053