In Vivo Seeding and Cross-Seeding of Localized Amyloidosis A Molecular Link between Type 2 Diabetes and Alzheimer Disease

Oskarsson, Marie E.Uppsala universitet,Institutionen för medicinsk cellbiologi (author)

Several proteins have been identified as amyloid forming in humans, and independent of protein origin, the fibrils are morphologically similar. Therefore, there is a potential for structures with amyloid seeding ability to induce both homologous and heterologous fibril growth; thus, molecular interaction can constitute a Link between different amyloid forms. Intravenous injection with preformed fibrils from islet amyloid polypeptide (IAPP), proIAPP, or amyloid-beta (A beta) into human IAPP transgenic mice triggered IAPP amyloid formation in pancreas in 5 of 7 mice in each group, demonstrating that IAPP amyloid could be enhanced through homologous and heterologous seeding with higher efficiency for the former mechanism. Proximity Ligation assay was used for colocalization studies of IAPP and A beta in islet amyloid in type 2 diabetic patients and A beta deposits in brains of patients with Alzheimer disease. All reactivity was not detected in islet amyloid although islet beta cells express A beta PP and convertases necessary for A beta production. By contrast, IAPP and proIAPP were detected in cerebral and vascular A beta deposits, and presence of proximity Ligation signal at both locations showed that the peptides were <40 nm apart. It is not clear whether IAPP present in brain originates from pancreas or is Locally produced. Heterologous seeding between IAPP and All shown here may represent a molecular Link between type 2 diabetes and Alzheimer disease.

Paulsson, Johan F.Uppsala universitet,Institutionen för medicinsk cellbiologi (author)
Schultz, Sebastian W. (author)
Ingelsson, MartinUppsala universitet,Geriatrik(Swepub:uu)maing121 (author)
Westermark, PerUppsala universitet,Molekylär och morfologisk patologi(Swepub:uu)perweste (author)
Westermark, Gunilla T.Uppsala universitet,Institutionen för medicinsk cellbiologi(Swepub:uu)gunwe105 (author)
Uppsala universitetInstitutionen för medicinsk cellbiologi (creator_code:org_t)

In:American Journal of Pathology: Elsevier BV185:3, s. 834-8460002-94401525-2191

By the author/editor: Oskarsson, Marie ...; Paulsson, Johan ...; Schultz, Sebasti ...; Ingelsson, Marti ...; Westermark, Per; Westermark, Guni ...

About the subject

MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Basic Medicine; and Cell and Molecul ...

MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Basic Medicine; and Immunology in th ...

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