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The effect of rosiglitazone on LRP1 expression and amyloid β uptake in human brain microvascular endothelial cells: a possible role of a low-dose thiazolidinedione for dementia treatment

  • Jae Hoon Moon (a1), Hyung Jun Kim (a2), Ae Hee Yang (a2), Hyun Min Kim (a1), Byung-Wan Lee (a1), Eun Seok Kang (a1), Hyun Chul Lee (a1) and Bong Soo Cha (a1) (a2)
  • DOI: http://dx.doi.org/10.1017/S1461145711001611
  • Published online: 01 November 2011
Abstract
Abstract

Thiazolidinediones, such as rosiglitazone or pioglitazone, are anti-diabetic agents that have been expected to show a beneficial effect in Alzheimer's disease (AD) because of their anti-inflammatory effect. However, these agents have failed to show a significant beneficial effect on AD in recent clinical trials. Here, we suggest that low-dose rosiglitazone treatment, and not the conventional doses, has an amyloid β (Aβ)-clearing effect by increasing LRP1, an Aβ outward transporter in the blood–brain barrier. Rosiglitazone up-regulated LRP1 mRNA and protein expression and LRP1 promoter activity in human brain microvascular endothelial cells (HBMECs). Aβ uptake through LRP1 in HBMECs was also increased by rosiglitazone. This increase in LRP1 and Aβ uptake was observed in up to 10 nm rosiglitazone concentration. At concentrations above 20 nm rosiglitazone, the LRP1 expression and Aβ uptake in HBMECs were not altered. The possible mechanism of this unusual dose response is discussed. This study suggests a new therapeutic application of thiazolidinediones for AD at a much lower dose than the doses used for diabetes treatment.

Copyright
Corresponding author
Address for correspondence: B. S. Cha, M.D., Ph.D., Prof., Division of Endocrinology and Metabolism, Department of Internal Medicine, Yonsei University College of Medicine, 250 Seongsanno, Seodaemun-gu, Seoul, Korea. Tel.: +82-2-2228-1962Fax: +82-2-393-6884Email: bscha@yuhs.ac
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The International Journal of Neuropsychopharmacology
  • ISSN: 1461-1457
  • EISSN: 1469-5111
  • URL: /core/journals/the-international-journal-of-neuropsychopharmacology
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