Beta amyloid and hyperphosphorylated tau deposits in the pancreas in type 2 diabetes
Strong epidemiologic evidence suggests an association between Alzheimer disease (AD) and type 2 diabetes. To determine if amyloid beta (A$\beta$) and hyperphosphorylated tau occurs in type 2 diabetes, pancreas tissues from 21 autopsy cases (10 type 2 diabetes and 11 controls) were analyzed. APP and tau mRNAs were identified in human pancreas and in cultured insulinoma beta cells (INS-1) by RT-PCR. Prominent APP and tau bands were detected by Western blotting in pancreatic extracts. Aggregated A$\beta$, hyperphosphorylated tau, ubiquitin, apolipoprotein E, apolipoprotein(a), IB1/JIP-1 and JNK1 were detected in Langerhans islets in type 2 diabetic patients. A$\beta$ was co-localized with amylin in islet amyloid deposits. In situ beta sheet formation of islet amyloid deposits was shown by infrared microspectroscopy (SIRMS). LPS increased APP in non-neuronal cells as well. We conclude that A$\beta$ deposits and hyperphosphorylated tau are also associated with type 2 diabetes, highlighting common pathogenetic features in neurodegenerative disorders, including AD and type 2 diabetes and suggesting that A deposits and hyperphosphorylated tau may also occur in other organs than the brain.
- URL: http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6T09-4TRR8KN-1&_user=164550&_coverDate=09%2F30%2F2010&_rdoc=1&_fmt=high&_orig=search&_sort=d&_docanchor=&view=c&_searchStrId=1408456772&_rerunOrigin=google&_acct=C000013218&_version=1&_urlVersion=0&_userid=164550&md5=ff768e7b216bc191202b17ccd23dc8bf
Record created on 2010-07-22, modified on 2016-08-08