Clinical trial NCT00303277: Do HMG CoA Reductase Inhibitors Affect Abeta Levels?
Official title: Do HMG CoA Reductase Inhibitors Affect Abeta Levels?
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: PHASE4
Conditions: Alzheimer's Disease
Aging
Keywords: Alzheimer's disease
beta-amyloid
statins
Lead sponsor: Seattle Institute for Biomedical and Clinical Research
Sponsor class: OTHER
First posted: 2006-03-16
Enrollment: 35
Sex: ALL
Minimum age (years): 18
Maximum age (years): 90
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: PREVENTION

Brief summary: Recent evidence suggests that there is a significant overlap between AD and cerebrovascular disease. In fact, AD and cerebrovascular disease may share some of the same risk factors, including hypercholesterolemia. In addition, studies have suggested that the HMG Co-A reductase inhibitor lipid-lowering agents, known as "statins," decrease the risk of AD by up to 70%; however, effects differed by specific statin use. This study will compare two statins, simvastatin (which crosses the blood brain barrier) and pravastatin (which does not), with respect to their ability to alter blood and cerebrospinal fluid (CSF) levels of AD and inflammatory markers. The primary aim of the proposed study is to determine whether there is a reduction in Abeta with statins and whether the ability of the statin to cross the blood-brain barrier will affect its ability to decrease Abeta. If it can be demonstrated that statins alter AD-associated biomarkers, this would have broad implications for the treatment and prevention of AD.

Detailed description: Recent evidence suggests that there is a significant overlap between AD and cerebrovascular disease. In fact, AD and cerebrovascular disease may share some of the same risk factors, including hypercholesterolemia. In addition, studies have suggested that the HMG Co-A reductase inhibitor lipid-lowering agents, known as "statins," decrease the risk of AD by up to 70%; however, effects differed by specific statin use. This study will compare two statins, simvastatin (which crosses the blood brain barrier) and pravastatin (which does not), with respect to their ability to alter blood and cerebrospinal fluid (CSF) levels of AD and inflammatory markers. The primary aim of the proposed study is to determine whether there is a reduction in Abeta with statins and whether the lipophilicity of the statin will affect its ability to decrease Abeta. In addition, the proposal will determine statin effects on both peripheral and central inflammation and whether the lipophilicity of the statin will affect its ability to decrease inflammation. If it can be demonstrated that statins alter AD-associated biomarkers, this would have broad implications for the treatment and prevention of AD.

This study will be performed in 60 cognitively normal middle-aged and older persons with hypercholesterolemia (total cholesterol \>200 and/or LDL\>130), presumably persons that have a lipid-related increased risk of AD and in whom alterations of CSF Abeta can be interpreted.The differential effects of the two statins will be evaluated in a 12-week randomized treatment trial with 30 subjects in each group.

Prior to randomization and following 12 weeks of treatment with simvastatin or pravastatin, subjects will undergo CSF and blood collection. In the CSF, concentrations of Abeta 1-40, Abeta 1-42, soluble APP, tau, 24S-hydroxycholesterol, apoE, total cholesterol, F2-isoprostanes, glucose, protein, and cell count will be measured. In the blood, concentrations of total cholesterol, HDL, LDL, triglyceride, phospholipids, fatty acids, 24S-hydroxycholesterol, apoE, apoB, apoA1, Abeta 1-40, Abeta 1-42, F2-isoprostanes, C-reactive protein, fibrinogen, iron, homocysteine, and albumin will be measured. Plasma simvastatin and pravastatin concentrations will be measured at study completion. APOE genotyping will be performed.

Eligibility criteria: Inclusion Criteria:

* Total cholesterol \> 200, and/or LDL \> 130
* No cognitive impairment
* Statin-naive for at least one year
* Women must not be pregnant, nursing, or planning to become pregnant

Exclusion Criteria:

* Back ailments which would hinder LP procedure
* Neurological disease, including stroke, Parkinson's disease, Multiple Sclerosis, uncontrolled epilepsy, history of severe head trauma
* Hepatic disease
* Renal insufficiency
* Unstable medical disease
* Severe pulmonary disease
* Severe cardiac disease
* Uncontrolled hypertension (greater than 160/90)
* Uncontrolled hyper/hypothyroidism
* History of blood clotting abnormalities or platelet abnormalities
* History of chronic major psychiatric disorders or presence of current major depressive disorder (by DSM-IV criteria)
* History of substance abuse within the past year
* Taking exclusionary medications

Primary outcomes:
measure: CSF abeta levels
timeFrame: baseline and 12 weeks
Secondary outcomes:
measure: CSF biomarkers
timeFrame: baseline and 12 weeks
Other outcomes:
Locations:
city: Seattle
country: United States
facility: VA Puget Sound Health Care System
state: Washington
Study officials:
affiliation: University of Washington
name: Elaine R Peskind, MD
role: PRINCIPAL_INVESTIGATOR
References:
citation: Li G, Larson EB, Sonnen JA, Shofer JB, Petrie EC, Schantz A, Peskind ER, Raskind MA, Breitner JC, Montine TJ. Statin therapy is associated with reduced neuropathologic changes of Alzheimer disease. Neurology. 2007 Aug 28;69(9):878-85. doi: 10.1212/01.wnl.0000277657.95487.1c.
citation: Li G, Higdon R, Kukull WA, Peskind E, Van Valen Moore K, Tsuang D, van Belle G, McCormick W, Bowen JD, Teri L, Schellenberg GD, Larson EB. Statin therapy and risk of dementia in the elderly: a community-based prospective cohort study. Neurology. 2004 Nov 9;63(9):1624-8. doi: 10.1212/01.wnl.0000142963.90204.58.
citation: Riekse RG, Li G, Petrie EC, Leverenz JB, Vavrek D, Vuletic S, Albers JJ, Montine TJ, Lee VM, Lee M, Seubert P, Galasko D, Schellenberg GD, Hazzard WR, Peskind ER. Effect of statins on Alzheimer's disease biomarkers in cerebrospinal fluid. J Alzheimers Dis. 2006 Dec;10(4):399-406. doi: 10.3233/jad-2006-10408.