Summary: A new study reports males seem to remember experiences of pain more clearly, while females are less stress by previous painful experiences. Researchers injected ZIP, a memory blocker into the brains of mice before a painful experience. Following the treatment, the males showed no signs of remembering the pain. The study suggests chronic pain is a problem to the extent you remember it. The findings could help develop new treatments for chronic pain.
Source: McGill University.
Scientists increasingly believe that one of the driving forces in chronic pain–the number one health problem in both prevalence and burden–appears to be the memory of earlier pain. Research published today/this week in Current Biology suggests that there may be variations, based on sex, in the way that pain is remembered in both mice and humans.
The research team, led by colleagues from McGill and University of Toronto Mississauga, found that men (and male mice) remembered earlier painful experiences clearly. As a result, they were stressed and hypersensitive to later pain when returned to the location in which it had earlier been experienced. Women (and female mice) did not seem to be stressed by their earlier experiences of pain. The researchers believe that the robust translational nature of the results, from mice to men, will potentially aid scientists to move forward in their search for future treatments of chronic pain.
It was a discovery that came as a total surprise.
Robust results in mice and men
“We set out to do an experiment looking at pain hypersensitivity in mice and found these surprising differences in stress levels between male and female mice,” explains Jeffrey Mogil, the E.P. Taylor Professor of Pain Studies in McGill’s Department of Psychology and Alan Edwards Centre for Research on Pain who is the senior author on the study. “So we decided to extend the experiment to humans to see whether the results would be similar. We were blown away when we saw that there seemed to be the same differences between men and women as we had seen in mice.”
“What was even more surprising was that the men reacted more, because it is well known that women are both more sensitive to pain than men, and that they are also generally more stressed out,” explains Loren Martin, the first author on the paper and an Assistant Professor of Psychology at the University of Toronto Mississauga.
Creating memories of pain in humans and mice
In experiments with both humans and mice, the subjects (41 men and 38 women between the ages of 18-40 in the case of humans) were taken to a specific room (or put in a testing container of a certain shape–depending on the species) where they experienced low levels of pain caused by heat delivered to their hind paw or forearm. Humans rated the level of pain on a 100-point scale and mice “rated” the pain by how quickly they moved away from the heat source. Immediately following this initial experience of low-level pain, subjects experienced more intense pain designed to act as Pavlovian conditioning stimuli. The human subjects were asked to wear a tightly inflated blood pressure cuff and exercise their arms for 20 minutes. This is excruciating and only seven of the 80 subjects rated it at less than 50 on a 100-point scale. Each mouse received a diluted injection of vinegar designed to cause a stomach ache for about 30 minutes.
In order to look at the role that memory plays in the experience of pain, the following day the subjects returned to either the same or a different room, or to the same or a different testing container. Heat was once again applied to their arms or hind paws.
When (and only when) they were taken into the same room as in the previous test, the men rated the heat pain higher than they did the day before, and higher than the women did. Similarly, male, but not female mice returning to the same environment exhibited a heightened heat pain response, while mice placed in a new and neutral environment did not.
“We believe that the mice and the men were anticipating the cuff, or the vinegar, and, for the males, the stress of that anticipation caused greater pain sensitivity,” says Mogil. “There was some reason to expect that we would see increased sensitivity to pain on the second day, but there was no reason to expect it would be specific to males. That came as a complete surprise.” Blocking memories makes the pain go away
In order to confirm that pain was increased due to memories of previous pain, the researchers interfered with memory by injecting the brains of male mice with a drug called ZIP that is known to block memory. When the researchers then ran the pain memory experiment, these mice showed no signs of remembered pain.
“This is an important finding because increasing evidence suggests that chronic pain is a problem to the extent that you remember it , and this study is the first time such remembered pain has been shown using a translational – both rodent and human subject – approach,” says Martin, who is also the Tier II Canada Research Chair in Translational Pain Research. “If remembered pain is a driving force for chronic pain and we understand how pain is remembered, we may be able help some sufferers by treating the mechanisms behind the memories directly.”
Mogil echoes this optimism, “This research supports the idea that the memory of pain can affect later pain.” He adds, “I think it is appropriate to say that further study of this extremely robust phenomenon might give us insights that may be useful for future treatment of chronic pain, and I don’t often say that! One thing is for sure, after running this study, I’m not very proud of my gender.”
About this neuroscience research article
Funding: The research was funded by the Canadian Institutes for Health Research (CIHR), the Natural Sciences and Engineering Research Council of Canada (NSERC) the Canadian Pain Society/Pfizer Early Career Investigator Pain Research Grant, the Louise and Alan Edwards Foundation, Brain Canada and the Canada Research Chairs Program.
Source: Caroline Brooks – McGill University Publisher: Organized by NeuroscienceNews.com. Image Source: NeuroscienceNews.com image is in the public domain. Original Research: Open access research for “Male-Specific Conditioned Pain Hypersensitivity in Mice and Humans” by Loren J. Martin, Erinn L. Acland, Chulmin Cho, Wiebke Gandhi, Di Chen, Elizabeth Corley, Basil Kadoura, Tess Levy, Sara Mirali, Sarasa Tohyama, Sana Khan, Leigh C. MacIntyre, Erika N. Carlson, Petra Schweinhardt, and Jeffrey S. Mogil in Current Biology. Published January 10 2019. doi:10.1016/j.cub.2018.11.030
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[cbtabs][cbtab title=”MLA”]McGill University “Men and Women Remember Pain Differently.” NeuroscienceNews. NeuroscienceNews, 10 January 2019. <https://neurosciencenews.com/pain-sex-differences-10485/>.[/cbtab][cbtab title=”APA”]McGill University(2019, January 10). Men and Women Remember Pain Differently. NeuroscienceNews. Retrieved January 10, 2019 from https://neurosciencenews.com/pain-sex-differences-10485/[/cbtab][cbtab title=”Chicago”]McGill University “Men and Women Remember Pain Differently.” https://neurosciencenews.com/pain-sex-differences-10485/ (accessed January 10, 2019).[/cbtab][/cbtabs]
Male-Specific Conditioned Pain Hypersensitivity in Mice and Humans
Pain memories are hypothesized to be critically involved in the transition of pain from an acute to a chronic state. To help elucidate the underlying neurobiological mechanisms of pain memory, we developed novel paradigms to study context-dependent pain hypersensitivity in mouse and human subjects, respectively. We find that both mice and people become hypersensitive to acute, thermal nociception when tested in an environment previously associated with an aversive tonic pain experience. This sensitization persisted for at least 24 hr and was only present in males of both species. In mice, context-dependent pain hypersensitivity was abolished by castrating male mice, pharmacological blockade of the hypothalamic-pituitary-adrenal axis, or intracerebral or intrathecal injections of zeta inhibitory peptide (ZIP) known to block atypical protein kinase C (including the protein kinase Mζ isoform). In humans, men, but not women, self-reported higher levels of stress when tested in a room previously associated with tonic pain. These models provide a new, completely translatable means for studying the relationship between memory, pain, and stress.