Research Focus

Research on CJD infectious particles from animals and in tissue culture led us to first discover new environmental microbiome derived sequences (circular SPHINX DNAs, see paper on the left) that can have a role in neurodegeneration and cancer. These sequences were independently confirmed in two Multiple Sclerosis patients in Germany. We have proposed that they are only the tip of the iceberg of unsuspected hidden viruses that can act in response to stress and aging.

The Section of Neuropathology research focuses on dementias and their causes, with an emphasis on Transmissible Encephalopathies (TSEs) such as human Creutzfeldt-Jakob disease (CJD), endemic sheep scrapie and “mad cow disease” (BSE and human vCJD). We continues to do fundamental research on neurodegeneration having developed small animal and tissue culture models infected by various human agents including sporadic CJD (sCJD), vCJD, kuru of New Guinea and Asiatic CJD (reviewed in ) Vast differences in the incubation time and regional brain lesions distinguish these different human agents.

Our results emphasize an environmental origin of TSE infectious agents, and the host responses to TSE agents as foreign pathogens. Moreover, it is likely that environmental causes, physiological stresses and several types of infectious agents, underlie more common dementias such as Alzheimer’s Disease (AD) and misfolded proteins such as amyloid. This line of approach deserves investigation, especially in view of major public health issues.

We also do experiments that elucidate the structure of the infectious agent. Our new tissue culture models have revealed virus-like particle arrays (at left) that correspond to isolated infectious brain particles of ~25nm. These arrays were not detectable in uninfected cells. They do not bind PrP antibodies, unlike PrP amyloid, a misfolded form of host PrP that is commonly believed to be the infectious agent or “prion”. We think misfolded PrP is a pathological response to infection. For more information see PMID23633671.

Ultrastructural array of virus-like particles PMID 17267596

Nuclease resistant circular DNAs copurify with infectivity in scrapie and CJD. Click here to download PDF

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