Journal
PLATELETS
Volume 17, Issue 1, Pages 56-60Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/09537100500181913
Keywords
coated-platelet; thrombin; convulxin; collagen; amyloid precursor protein; Alzheimer's disease
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Funding
- NHLBI NIH HHS [HL68129] Funding Source: Medline
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Coated-Platelets are a subset of platelets produced by dual-agonist activation with collagen plus thrombin and are characterized by strong retention of several procoagulant, alpha-granule proteins on the cell surface. In this report we demonstrate that coated-platelets also retain full-length amyloid precursor protein (APP) on their surface in contrast to the cleavage of APP in platelets activated with a single agonist. In addition, western blot analysis indicated that APP is derivatized during coated-platelet synthesis. We subsequently measured coated-platelet production in patients with Alzheimer's disease (AD). Twenty-two AD patients showed a wide distribution of coated-platelet values; however the least impaired AD patients produced coated-platelets at a level significantly above that of aged controls (41.0 +/- 9.9 vs. 28.7 +/- 11.4%; mean +/- 1SD; p = 0.017). These findings suggest that coated-platelets may be a model of aberrant APP processing in early AD patients.
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