Wednesday, January 30, 2019

RESEARCH: New skin test detects prion infection before symptoms appear.

RESEARCH: New skin test detects prion infection before symptoms appear. Prions can infect both humans and animals, causing Creutzfeldt-Jakob disease (CJD) in humans, mad cow disease in cattle, and chronic wasting disease in elk and deer. The infectious, misfolded protein particles often go undetected as they destroy brain tissue, causing memory loss, mobility issues, and ultimately death. Preclinical detection of prions has proven difficult, but new research suggests skin samples hold early signs of prion disease that precede neurologic symptoms. Currently, a definitive diagnosis of Creutzfeldt-Jakob disease is dependent on the examination of diseased brain tissue obtained at biopsy or autopsy. It has been impossible to detect at the early preclinical stage," said Wenquan Zou, MD, PhD, associate professor of pathology at Case Western Reserve University School of Medicine. In a ground-breaking study published in Nature Communications, Zou and an international team of researchers successfully used two methods to detect prions in skin samples collected from inoculated rodents. The study provides the first proof-of-concept evidence that readily accessible skin samples could be used to detect prion disease early -- before clinical symptoms appear. In the new study, Zou and colleagues successfully detected prions in rodent skin samples as early as two weeks post-infection. They also detected prions in the skin of uninoculated rodents that were housed alongside inoculated cage mates, demonstrating that prion transmission can occur between cohabiting rodents.

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