Constipated? Study Finds Surprising Cause - Yale School Of Medicine

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A Yale-led study has shown a surprising link between constipation and herpes infection. The finding, published June 8 in Cell Host & Microbe, advances the science on herpes, and could help patients with chronic gastrointestinal diseases with no clear cause.

Individuals with herpes have reported seemingly unrelated symptoms such as constipation and urinary retention (inability to empty the bladder), but the mechanism was not understood. The research team, led by Akiko Iwasaki, professor of immunobiology and Howard Hughes Medical Institute investigator, decided to investigate using mice models of herpes simplex virus-1, the dominant cause of genital herpes in the United States.

They found that the herpes virus spread from the genitals to nerves in the spinal chord, and then on to neurons in the colon, killing them. The damage to the colonic neurons prevented the movement of food along the digestive tract, leading to an enlarged colon and disease.

While the effects in mice are distinct from what happens in people with herpes, the study reveals a previously unrecognized disease process. “The key findings is that there is this unexpected infection in the neurons in the colon wall after herpes infection,” said Iwasaki. “Other members of the herpes virus family, including Epstein-Barr virus, chicken pox virus, and cytomegalovirus have been found in the neurons of the colon of people with unexplained chronic constipation. When doctors can’t figure out the cause of these chronic intestinal conditions, one thing to look at is a viral infection.”

Other study authors include William Khoury-Hanold, Brian Yordy, Philip Kong, Yong Kong, William Ge, Klara Szigeti-Buck, Alexandra Ralevski, and Tamas L. Horvath. This research was supported by the Howard Hughes Medical Institute and the National Institutes of Health.

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Tamas Horvath, DVM, PhDJean and David W. Wallace Professor of Comparative Medicine and Professor of Neuroscience and of Obstetrics, Gynecology, and Reproductive Sciences
Akiko Iwasaki, PhDSterling Professor of Immunobiology and Professor of Dermatology and of Molecular, Cellular, and Developmental Biology and of Epidemiology (Microbial Diseases)
Yong Kong, PhDSenior Research Scientist

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Constipated? Study Finds Surprising Cause - Yale School Of Medicine

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