We previously reported1 the presence of amyloid-β protein (Aβ) deposits in individuals with Creutzfeldt–Jakob disease (CJD) who had been treated during childhood with human cadaveric pituitary-derived growth hormone (c-hGH) contaminated with prions. The marked deposition of parenchymal and vascular Aβ in these relatively young individuals with treatment-induced (iatrogenic) CJD (iCJD), in contrast to other prion-disease patients and population controls, allied with the ability of Alzheimer’s disease brain homogenates to seed Aβ deposition in laboratory animals, led us to argue that the implicated c-hGH batches might have been contaminated with Aβ seeds as well as with prions. However, this was necessarily an association, and not an experimental, study in humans and causality could not be concluded. Given the public health importance of our hypothesis, we proceeded to identify and biochemically analyse archived vials of c-hGH. Here we show that certain c-hGH batches to which patients with iCJD and Aβ pathology were exposed have substantial levels of Aβ40, Aβ42 and tau proteins, and that this material can seed the formation of Aβ plaques and cerebral Aβ−amyloid angiopathy in intracerebrally inoculated mice expressing a mutant, humanized amyloid precursor protein. These results confirm the presence of Aβ seeds in archived c-hGH vials and are consistent with the hypothesized iatrogenic human transmission of Aβ pathology. This experimental confirmation has implications for both the prevention and the treatment of Alzheimer’s disease, and should prompt a review of the risk of iatrogenic transmission of Aβ seeds by medical and surgical procedures long recognized to pose a risk of accidental prion transmission2,3.
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This work was funded by the UK Medical Research Council (MRC); the National Institute of Health Research (NIHR) University College London Hospitals (UCLH)/University College London (UCL) Biomedical Research Centre; the Leonard Wolfson Experimental Neurology Centre; and a grant to D.M.W. from the National Institute on Aging (AG046275). We thank the Queen Square Brain Bank for Neurological Disorders (supported by the Reta Lila Weston Trust for Medical Research, the Progressive Supranuclear Palsy (Europe) Association and the MRC) at the UCL Institute of Neurology, University College London; and the Oxford Brain Bank (supported by the MRC, the NIHR Oxford Biomedical Research Centre and the Brains for Dementia Research programme, jointly funded by Alzheimer’s Research UK and Alzheimer’s Society) for providing the UK human brain tissue samples. We thank M. Ellis for image analysis; Z. Jaunmuktane for advice on CAA scoring; and G. Graham, C. Fitzhugh, R. Labesse-Garbal and other staff of the MRC Prion Unit Biological Services facility for animal inoculation, observation and care. We thank M. Farmer and E. Quarterman for technical assistance; O. Avwenagha and J. Wadsworth for assistance in selecting and processing tissue samples; and E. Noble for assistance with assay development. We thank P. Adlard for help in identifying growth-hormone batches for this study and M. Sutton for providing c-hGH vials from archived stores at Public Health England Porton Down. Antibodies m266, 2G3 and 21F12 were gifts from P. Seubert and D. Schenk, Elan Pharmaceuticals.
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