 |
|
Decreased Prevalence of Alzheimer Disease Associated With 3-Hydroxy-3-Methyglutaryl Coenzyme A Reductase Inhibitors
Benjamin Wolozin, MD, PhD;
Wendy Kellman;
Paul Ruosseau, MD;
Gastone G. Celesia, MD;
George Siegel, MD
Arch Neurol. 2000;57:1439-1443.
ABSTRACT
| |
Context Increasing evidence suggests that cholesterol plays a role in the pathophysiology of Alzheimer disease (AD). For instance, an elevated serum cholesterol level has been shown to be a risk factor for AD.
Objective To determine whether patients taking 3-hydroxy-3-methylglutaryl coenzyme A reductase inhibitors (statins), which are a group of medicines that inhibit the synthesis of cholesterol, have a lower prevalence of probable AD.
Design The experiment uses a cross-sectional analysis comparing the prevalence of probable AD in 3 groups of patients from hospital records: the entire population, patients receiving 3-hydroxy-3-methylglutaryl coenzyme A reductase inhibitors (hereafter referred to as the statins), and patients receiving medications used to treat hypertension or cardiovascular disease.
Patients The subjects studied were those included in the computer databases of 3 different hospitals for the years October 1, 1996, through August 31, 1998.
Main Outcome Measures Diagnosis of probable AD.
Results We find that the prevalence of probable AD in the cohort taking statins during the study interval is 60% to 73% (P<.001) lower than the total patient population or compared with patients taking other medications typically used in the treatment of hypertension or cardiovascular disease.
Conclusions There is a lower prevalence of diagnosed probable AD in patients taking 2 different 3-hydroxy-3-methylglutaryl coenzyme A reductase inhibitors—lovastatin and pravastatin. While one cannot infer causative mechanisms based on these data, this study reveals an interesting association in the data, which warrants further study.
INTRODUCTION
THE PATHOPHYSIOLOGY of Alzheimer disease (AD) has many connections with cholesterol metabolism. Epidemiological studies show that patients with elevated cholesterol levels have an increased risk of AD.1-2 One of the major risk factors for AD, is apolipoprotein E type 4 (APOE4), which is a cholesterol transport protein.3-4 Patients carrying the APOE4 polymorphism have elevated cholesterol levels, although at least part of the risk for AD seems to derive from factors unrelated to cholesterol level.2 Patients with the APOE4 polymorphism also have increased risk of cardiovascular disease, and epidemiological studies show that patients with cardiovascular disease have an increased risk of AD.5 A second putative risk factor for AD,  2-macroglobulin, binds to the same receptor as does APOE4.6 This receptor, the lipoprotein receptor–related protein, is important for cellular uptake of cholesterol.7 Cholesterol also effects the biology of  -amyloid (A). -myloid is a protein that accumulates in the affected brains of patients with AD and is thought to cause the neurodegeneration underlying AD.8 Production of the A peptide is increased by cholesterol in some cells.9 These multiple links suggest a potentially important relation between cholesterol and AD.
To test this possibility we analyzed the effect of a class of medications termed "statins," which reduce the level of plasma cholesterol, on the prevalence of AD. Statins act by inhibiting the enzyme 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase.10 We examined 3 independent hospital patient databases and compared the prevalence of AD in patients taking statins with the prevalence of AD in the total patient population or in cohorts of patients taking other medications that do not inhibit cholesterol synthesis but are used in treating cardiovascular disease. We focused on 3 statins—lovastatin (Mevacor), pravastatin sodium (Pravachol), and simvastatin (Zocor). We report that patients who have taken lovastatin or pravastatin have a lower prevalence of probable AD.
PATIENTS, MATERIALS, AND METHODS
This is a cross-sectional analysis comparing the prevalence of AD in patients 60 years or older in the following 3 groups (which are each subdivided by the particular medication): (1) the entire population, (2) patients receiving statins, and (3) patients receiving medications used to treat hypertension or cardiovascular disease. The term "AD," as used for data in this article, refers to probable AD. To perform the study, we searched relational databases at 3 different hospitals (Loyola University Medical Center, Maywood, Ill, 22,143 medical records; Edward Hines Jr Veterans Affairs Hospital, Hines, Ill, 23,028 medical records; and Carl T. Hayden Veterans Affairs Medical Center, Phoenix, Ariz, 15,178 medical records) to obtain aggregate data about the frequency of AD. The relational databases allow correlational analysis of fields (such as diagnosis and medication) within a patient medical record from an aggregate patient database. The 3 databases are independent and do not overlap. The databases contain patient medical records, including information relevant to this study: age, sex, International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) diagnoses, and medications history. Severity of disease was not present in the databases. For Edward Hines Jr Veterans Affairs Hospital and Carl T. Hayden Veterans Affairs Medical Center, the medical records describe patients who used the hospitals in the last 2 years (October 1, 1996, through August 31, 1998). Entries in the databases that contained patients' names but no medical information were excluded. Patients younger than 60 years were also excluded. Next we identified all patients who were taking 8 different medications (Table 1). Some of the patients may have received more than 1 medication or have had more than 1 diagnosis. We then determined the prevalence of AD or transient ischemic attacks (TIAs) for patients taking each medication. The patient searches were carried out using ICD-9-CM codes. Alzheimer disease was specifically identified under the code 331.0. However, as other codes also apply to AD, we included the following: 331.2 and 290.0, 290.10 to 290.13, 290.20, 290.21, and 290.3. Patients with TIAs were identified with ICD-9-CM codes: 434.00, 433.00, 433.10, 433.20, 435.0, and 435.2. Patients at each site who were being assessed for dementia were all seen or their medical records reviewed by the same attending neurologist or geriatrician (Loyola University Medical Center [G.G.C.]; Edward Hines Jr Veterans Affairs Hospital [G.S.]; and Carl T. Hayden Veterans Administration Medical Center [P.R.]). The diagnosis of AD was made according to the criteria of the National Institute of Neurology, Communicative Disorders, and Stroke–Alzheimer's Disease and Related Disorders Association11: clinical evidence of progressive dementia in more than 1 area of cognition in patients aged between 40 and 90 years, documentation of cognitive impairment by the Mini-Mental State Examination (MMSE), neuropsychological examination, and exclusion of other diagnoses by computed tomography or magnetic resonance imaging of the brain. The patients with the diagnosis of AD were all screened for other causes of their dementia. Each patient was screened for other metabolic, toxic, or affective disorders that may produce dementia. To screen for toxic or metabolic disorders, every patient with a putative diagnosis of AD underwent blood workup that included tests for VDRL findings and for thyrotropin, electrolytes, vitamin B12, folic acid, hepatic enzymes, serum creatinine, and serum urea nitrogen levels. Patients were screened for drug abuse, alcohol abuse, or affective disorder by clinical assessment. However, it is recognized that there may be considerable overlap of probable AD with ischemic white matter and subcortical nuclear lesions and leukoariosis as shown in prospective clinical longitudinal studies,12-13 as well as overlap of definite AD with infarction on postmortem analyses. Thus, the diagnosis of probable AD by the usual conventional criteria does not exclude confounding vascular disease factors. In this study, the diagnosis of AD refers to probable AD and does not exclude the possibility of overlapping leukoariosis or ischemic white matter or subcortical nuclear lesions.
|
|
|
|
Prevalence of Alzheimer Disease (AD)*
|
|
|
At the Carl T. Hayden Veterans Affairs Medical Center, all patients with a diagnosis of AD had MMSE scores of 24 or less. At Loyola University Medical Center all patients either had a MMSE score of 24 or less or had taken a full battery of neuropsychological testing. At the Edward Hines Jr Veterans Affairs Hospital, all patients for whom a MMSE test result was available had scores of 24 or less.
Statistics were determined by comparisons of proportions using  2 analyses. All statistics list P values.
RESULTS
The mean age of patients (>60 years) taking each medication did not differ significantly among the 8 samples (Table 1). In all 3 databases the overall prevalence of diagnosis of AD (1.28%) was found to be below the estimated population prevalence of AD in the elderly subjects (2%-10%).14 This could be owing to the use of register-based case finding vs population-based active screening.
The trends seen at each hospital were similar. At each of the 3 sites, the prevalence of diagnosed AD in patients taking lovastatin or pravastatin was 60% to 73% lower than the entire patient population aged 60 years or older (Table 1, P<.001 for each site). At each site, patients taking lovastatin or pravastatin also had a lower prevalence of diagnosed AD than patients taking -blockers, furosemide, or captopril (Table 1). However, although the trends for each medication were clear, the number of patients receiving each medication at each site was not sufficiently large to allow meaningful statistical analysis. To maximize the statistical power of the analysis, we combined the data from the 3 sites. This was justified because of the similar diagnostic trends and similar ages of the patient populations. One clear difference between the populations at each site, sex, is discussed below.
The prevalence of diagnosed AD in the combined set was 69.6% less than in the total patient population (Figure 1, left, and Table 1). The prevalence of diagnosed AD for patients taking lovastatin or pravastatin was lower than the prevalence of diagnosed AD for patients taking each of the individual medications examined as well. Our study contained 2 different controls for potential selection biases: the effects of other medications on the prevalence of diagnosed AD, and the effects of the statins on the prevalence of another syndrome (TIAs). The prevalence of diagnosed AD in patients taking the statins to patients taking other medications related to hypertension and cardiovascular disease was examined to compensate for potential errors in assessment of the total number of patients in the database. This analysis permits comparison of the patients receiving the statins with patients who one expects to have a similar age-related prevalence of diagnosed AD, such as those with hypertension or cardiovascular disease. Patients taking either lovastation or pravastatin had a prevalence of diagnosed AD that was 73% lower than those taking -blockers, 64.2% less than those taking captopril, and 57.3% lower than those taking furosemide (Figure 1, left, and Table 1). The comparisons to other medications are particularly informative because they control for potential biases that could occur if clinicians were reticent to refer patients being treated for cardiovascular disorders for a neurologic workup of AD.
|
|
|
|
Left, Prevalence of diagnosed Alzheimer disease (AD) for patients receiving statins and related medications. The total patient sample size used for this study was 56,790 patients. The total number of patients with a diagnosis of AD, both taking and not taking medications, is 753. Right, Prevalence of transient ischemic attack (TIA) for patients receiving statins and related medications. Data are shown from the database at Loyola University Medical Center, Maywood, Ill, but similar results were seen at the other 2 sites (Edward Hines Jr Veterans Affairs Hospital, Maywood, and Carl T. Hayden Veterans Affairs Medical Center, Phoenix, Ariz). The total patient sample size used for this study was 26,171 patients. Statistical significance was set at P<.001.
|
|
|
The sex distribution did differ between the 3 sites, but the differences did not seem to effect the outcome. The patients at both veterans affairs medical centers were more than 95% male, while the patients at Loyola University Medical Center were 46.5% male and 54.5% female. The presence of a larger population of female subjects in the Loyola University Medical Center database does not seem likely to account for the smaller apparent efficacy of lovastatin or pravastatin in reducing the prevalence of diagnosed AD there because the females in the Loyola University Medical Center database showed a greater reduction in the prevalence of diagnosed AD than the males (96.3% vs 58%, respectively).
Another possible source of bias could have originated from physicians terminating statin treatment for a patient receiving the diagnosis of AD. To examine this issue, we examined the medical records of patients from the Edward Hines Jr Veterans Affairs Medical Center to determine whether patients with diagnoses of AD had their statin treatment terminated. We did not observe any cases in which treatment for hypercholesterolemia was terminated among patients already diagnosed with AD. Among the patient medical records examined, the duration of statin use varied from 1 to 5 years, with the exception of 1 case in which a patient briefly started a trial of lovastatin therapy, then stopped treatment after 1 month because of side effects and subsequently progressed to AD. This suggests that termination of statin treatment in patients with AD did not account for the lower prevalence of diagnosed AD in patients receiving statins.
To control for other selection biases, such as the possibility that internists might not refer patients for neurologic workups, we also examined the prevalence of TIAs in patients receiving the 8 medications. None of the HMG-CoA reductase inhibitors (nor any of the other medications) had any effect on reducing the rate of TIAs in the patient populations examined (Figure 1, right). In fact, the prevalence of TIAs was increased for all of the medications examined compared with the total patient database. This likely reflects the fact that a TIA is the result of vascular disease, which is expected to be increased in all of the patients receiving all of the medications studied. A significant variable that could not be determined in this study is the prevalence of coexisting cerebral ischemic disease in the populations receiving and not receiving statin therapy.
Despite being an HMG-CoA reductase inhibitor, simvastatin was not associated with a lower prevalence of diagnosed AD. Patients receiving simvastatin had a prevalence of diagnosed AD that did not differ significantly from that of the total patient population or that of patients receiving captopril or furosemide.
COMMENT
This study examines the relation between use of HMG-CoA reductase inhibitors, collectively termed statins, and the prevalence of diagnosed AD. We chose to examine the statins because of increasing evidence linking cholesterol metabolism to AD. The results present evidence that there is a lower prevalence of diagnosed AD in patients taking 2 different HMG-CoA reductase inhibitors—lovastatin and pravastatin. While one cannot infer causative mechanisms based on these data, data do suggest an interesting association, which warrants further study.
In this study we performed a cross-sectional analysis of 3 independent hospital patient databases and observed that patients taking the HMG-CoA reductase inhibitors lovastatin or pravastatin exhibited a 69.6% reduction in the prevalence of diagnosed AD. A number of controls present in our study lead us to conclude that the lower prevalence in diagnosed AD associated with the statins represents a protective effect of these medications rather than a spurious bias in the databases. To control for the possibility that physicians might not prescribe statins to patients with dementias, we compared the prevalence of diagnosed AD for patients taking statins with patients taking other medications that are used to treat cardiovascular disease but that do not influence cholesterol metabolism. Compared with other cardiovascular medications, patients taking the statins also exhibited a significant reduction in the prevalence of diagnosed AD. To control for the possibility that physicians might not diagnose neurologic diseases in patients receiving the statins, we compared the prevalence of diagnosed AD to the prevalence of TIAs for patients taking the statins, as well as other cardiovascular medications. Only patients taking the statins had a lower prevalence of AD compared with patients taking other cardiovascular medications. Finally, we also examined the medical records of some of the patients and observed no evidence suggesting that physicians were discontinuing statin treatment in patients with AD.
The particular relational databases used in this study are best at determining associations. While data were not analyzed using a case-control paradigm, in which identified patients are matched for age, sex, and ethnicity to determine an odds ratio, the aggregate nature of the data does benefit from the ability to analyze a large population cohort. Future studies will allow us to determine the relation between the length of time taking medication, the dose of medication, cholesterol levels, and the degree of risk reduction for AD.
Two aspects of our study produced unexpected results. First, the prevalence of patients with a diagnosis of AD in these databases is less than has been reported in the literature.14 This difference in the observed rate of AD might be owing in part to our use of register-based hospital databases because the physicians generating such databases do not specifically focus on the diagnosis of AD and other dementias. In such hospitals, the threshold for considering a diagnosis of AD (and referring such patients to a neurologist for evaluation) is likely to be higher than in a study in which the physicians are specifically focusing on detecting and diagnosing dementia. It is possible that some subjects with MMSE scores higher than 24 who actually had mild or very mild AD would have been missed by this study. The low prevalence of diagnosed AD reported at the Edward Hines Jr Veterans Affairs Hospital suggests that the underreporting of AD may be particularly prevalent at this site. However, even at this site, no particular selection bias was evident because the prevalence in diagnosed AD was proportionately lower in all the groups examined.
A second surprising finding in our study is that the HMG-CoA reductase inhibitor simvastatin has only a weak effect, if any at all, in reducing the prevalence of diagnosed AD. Simvastatin and pravastatin are similar in structure, are equally effective at inhibiting liver HMG-CoA reductase, and share similar blood-brain barrier permeabilities.15 The differential effects of the statins on the prevalence of diagnosed AD contrasts with the similar efficacy at inhibiting liver HMG-CoA and, therefore, suggests that the reason for the bias in these data relates to a factor other than the reduction in liver HMG-CoA activity. The reason might be due to biological considerations, such as the actions of HMG-CoA reductase inhibitors on the brain or cerebral vasculature. Alternately, the difference could be owing to clinical considerations. For instance, since simvastatin is slightly newer than lovastatin or pravastatin, a lower prevalence of AD among patients taking simvastatin could have resulted from differences in physician prescribing patterns among the statins. Finally, it is also possible that these heterogeneity of effects could be owing to chance.
A number of studies have noted a potential relation between cholesterol level and AD, although whether this relation is direct and causative or indirect remains to be determined. A number of studies suggest that elevated cholesterol levels might correlate with AD.1-2,5 Notkola et al1 observed that an elevated cholesterol level increases the risk of AD. Similarly, Sparks5 observed that patients with cardiovascular disease, which is a disease associated with an elevated cholesterol level, are at increased risk of AD. The ApoE4 isozyme, a cholesterol transport protein associated with an elevated cholesterol level, is known to increase the risk of AD.3 In addition, cholesterol has also been shown to directly affect A secretion.9 Recent studies have shown a direct connection between cholesterol level and neuritic plaque burden using the PDAPP transgenic mice, which are transgenic for the human amyloid precursor protein and develop neuritic plaques.16-17 Refolo et al17 have shown increased dietary cholesterol intake in PDAPP transgenic mice leads to an elevated serum cholesterol level and an increased plaque load compared with mice fed normal diets.17 Our observations of decreased prevalence of diagnosed AD associated with treatment of hypercholesterolemia provides further evidence of a potential link between cholesterol level and AD.
The results of this article, while not showing any causal relations, establish a distinct association between use of the statins among a population of patients with the diagnosis of probable AD. The source of the association may be related to (1) the criteria for the diagnosis of AD and for exclusion of ischemic cerebral disease, (2) the criteria for selection of patients for statin treatment, or (3) some other unknown confounding variable in this population of patients with dementia. In any of these cases, the fact of an inverse relation of statin therapy to dementia of any form is of considerable potential importance and needs to be tested with a rigorous prospective clinical trial.
AUTHOR INFORMATION
Accepted for publication June 28, 2000.
This research was supported in part by grants from the Neuroscience Research and Education Foundation, San Diego, Calif, and from the Alzheimer Association, Chicago, Ill.
We thank Robert Morris and Kevin Dizorzi from the Carl T. Hayden Veterans Administration Medical Center, Phoenix, Ariz, and Sabah Al Janabi from Loyola University Medical Center, Maywood, Ill, for their assistance in the database searches. We also thank Hossein Ghanbari from Panacea Corp, Bethesda, Md, and Jack Lee, MD, PhD, and Richard Cooper, MD, from Loyola University Medical Center for their helpful comments.
Corresponding author: Benjamin Wolozin, MD, PhD, Department of Pharmacology, Loyola University Medical Center, Bldg 102, Room 3634, 2160 S First Ave, Maywood, IL 60153 (e-mail: bwolozi{at}luc.edu).
From the Departments of Pharmacology (Dr Wolozin), Neurology (Drs Celesia and Seigel), and Biochemistry (Dr Siegel and Ms Kellman), Loyola University Medical Center, Maywood, Ill; Department of Neurology, Edward Hines Jr Veterans Affairs Hospital, Hines, Ill (Dr Siegel); and Department of Geriatrics and Extended Care Medicine, Carl T. Hayden Veterans Affairs Medical Center, Phoenix, Ariz (Dr Rousseau). Drs Wolozin and Siegel have applied for a patent on the use of lovastatin and pravastatin in treating Alzheimer disease.
REFERENCES
| |
1. Notkola IL, Sulkava R, Pekkanen J, et al. Serum total cholesterol, apolipoprotein E epsilon 4 allele, and Alzheimer's disease. Neuroepidemiology. 1998;17:14-20.
FULL TEXT
|
ISI
| PUBMED
2. Jarvik GP, Wijsman EM, Kukull WA, Schellenberg GD, Yu C, Larson EB. Interactions of apolipoprotein E genotype, total cholesterol level, age, and sex in prediction of Alzheimer's disease: a case-control study. Neurology. 1995;45:1092-1096.
ABSTRACT
3. Corder E, Saunders A, Strittmatter W, et al. Gene dose of apolipoprotein E type 4 allele and the risk of Alzheimer's disease in late onset families. Science. 1993;261:921-923.
FREE FULL TEXT
4. Mahley R. Apolipoprotein E: cholesterol transport protein with expanding role in cell biology. Science. 1988;240:622-630.
FREE FULL TEXT
5. Sparks DL. Coronary artery disease, hypertension, ApoE, and cholesterol: a link to Alzheimer's disease? Ann N Y Acad Sci. 1997;826:128-146.
ISI
| PUBMED
6. Narita M, Holtzman DM, Schwartz AL, Bu G. Alpha2-macroglobulin complexes with and mediates the endocytosis of beta-amyloid peptide via cell surface low-density lipoprotein receptor-related protein. J Neurochem. 1997;69:1904-1911.
ISI
| PUBMED
7. Blacker D, Wilcox M, Laird N, et al. Alpha-2 macroglobulin is genetically associated with Alzheimer disease. Nat Genet. 1998;19:357-360.
FULL TEXT
|
ISI
| PUBMED
8. Selkoe D, Lansbury P. Biochemistry of Alzheimer's and Prion diseases. In: Siegel G, Agranoff B, Albers R, Fisher S, Uhler M, eds. Basic Neurochemistry. Philadelphia, Pa: Lippincott-Raven: 1999:949-968.
9. Simons M, Keller P, De Strooper B, Beyreuther K, Dotti C, Simons K. Cholesterol depletion inhibits the generation of -amyloid in hippocampal neurons. Proc Natl Acad Sci U S A. 1998;95:6460-6464.
FREE FULL TEXT
10. Endo A, Hasumi K. Biochemical aspect of HMG CoA reductase inhibitors. Adv Enzyme Regul. 1989;28:53-64.
FULL TEXT
|
ISI
| PUBMED
11. McKhann G, Drachman D, Folstein M, Katzman R, Price D, Stadlan EM. Clinical diagnosis of Alzheimer's disease: report of the NINCDS-ADRDA Work Group under the auspices of the Department of Health and Human Services Task Force on Alzheimer's disease. Neurology. 1984;34:939-944.
FREE FULL TEXT
12. Blennow K, Wallin A. Clinical heterogeneity of probable Alzheimer's disease. J Geriatr Psychiatry Neurol. 1992;5:106-113.
13. Bowler J, Munoz D, Merskey H, Hachinski V. Factors affecting the age of onset and rate of progression of Alzheimer's disease. J Neurol Neurosurg Psychiatry. 1998;65:184-190.
FREE FULL TEXT
14. Fratiglioni L, De Ronchi D, Aguero-Torres H. Worldwide prevalence and incidence of dementia. Drugs Aging. 1999;15:365-375.
FULL TEXT
|
ISI
| PUBMED
15. Saheki A, Terasaki T, Tamai I, Tsuji A. In vivo and in vitro blood-brain barrier transport of 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase inhibitors. Pharm Res. 1994;11:305-311.
FULL TEXT
|
ISI
| PUBMED
16. Games D, Adams D, Alessandrini R, et al. Development of neuropathology similar to Alzheimer's disease in transgenic mice overexpressing the 717V-F -amyloid precursor protein. Nature. 1995;373:523-528.
FULL TEXT
| PUBMED
17. Refolo LM, Pappolla MA, Malester B, et al. Hypercholesterolemia accelerates the Alzheimer's amyloid pathology in a transgenic mouse model. Neurobiol Aging. In press.
RELATED ARTICLES
Is There a Connection Between the Concentration of Cholesterol Circulating in Plasma and the Rate of Neuritic Plaque Formation in Alzheimer Disease?
Robert W. Haley and John M. Dietschy
Arch Neurol. 2000;57(10):1410-1412.
EXTRACT
| FULL TEXT
Archives of Neurology Reader's Choice: Continuing Medical Education
Arch Neurol. 2000;57(10):1535-1537.
FULL TEXT
THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES
|
Effects of Cardiovascular Medications on Rate of Functional Decline in Alzheimer Disease
Rosenberg et al.
AJGP 2008;16:883-892.
ABSTRACT
| FULL TEXT
Estrogens and Alzheimer's Disease: Is Cholesterol a Link?
Etgen
Endocrinology 2008;149:4253-4255.
FULL TEXT
Direct and Potent Regulation of {gamma}-Secretase by Its Lipid Microenvironment
Osenkowski et al.
J. Biol. Chem. 2008;283:22529-22540.
ABSTRACT
| FULL TEXT
Use of statins and incidence of dementia and cognitive impairment without dementia in a cohort study
Cramer et al.
Neurology 2008;71:344-350.
ABSTRACT
| FULL TEXT
Statins, incident Alzheimer disease, change in cognitive function, and neuropathology
Arvanitakis et al.
Neurology 2008;70:1795-1802.
ABSTRACT
| FULL TEXT
Independent Inhibition of Alzheimer Disease {beta}- and {gamma}-Secretase Cleavage by Lowered Cholesterol Levels
Grimm et al.
J. Biol. Chem. 2008;283:11302-11311.
ABSTRACT
| FULL TEXT
Statin-Induced Heme Oxygenase-1 Increases NF-{kappa}B Activation and Oxygen Radical Production in Cultured Neuronal Cells Exposed to Lipopolysaccharide
Hsieh et al.
Toxicol Sci 2008;102:150-159.
ABSTRACT
| FULL TEXT
A Pivotal Role for Interleukin-4 in Atorvastatin-associated Neuroprotection in Rat Brain
Clarke et al.
J. Biol. Chem. 2008;283:1808-1817.
ABSTRACT
| FULL TEXT
Geranylgeranyl pyrophosphate stimulates {gamma}-secretase to increase the generation of A and APP-CTF{gamma}
Zhou et al.
FASEB J. 2008;22:47-54.
ABSTRACT
| FULL TEXT
HMG-CoA Reductase Inhibitor Simvastatin Inhibits Cell Cycle Progression at the G1/S Checkpoint in Immortalized Lymphocytes from Alzheimer's Disease Patients Independently of Cholesterol-Lowering Effects
Sala et al.
J. Pharmacol. Exp. Ther. 2008;324:352-359.
ABSTRACT
| FULL TEXT
Simvastatin-Induced Heme Oxygenase-1 Increases Apoptosis of Neuro 2A Cells in Response to Glucose Deprivation
Hsieh et al.
Toxicol Sci 2008;101:112-121.
ABSTRACT
| FULL TEXT
Association of statin use with cognitive decline in elderly African Americans
Szwast et al.
Neurology 2007;69:1873-1880.
ABSTRACT
| FULL TEXT
Statins Reduce Amyloid-beta Production through Inhibition of Protein Isoprenylation
Ostrowski et al.
J. Biol. Chem. 2007;282:26832-26844.
ABSTRACT
| FULL TEXT
Characterization of the Lipid Profile in Dementia and Depression in the Elderly
Dimopoulos et al.
J Geriatr Psychiatry Neurol 2007;20:138-144.
ABSTRACT
Statins prevent cholinesterase inhibitor blockade of sympathetic {alpha}7-nAChR-mediated currents in rat superior cervical ganglion neurons
Mozayan and Lee
Am. J. Physiol. Heart Circ. Physiol. 2007;293:H1737-H1744.
ABSTRACT
| FULL TEXT
Statin therapy is associated with reduced neuropathologic changes of Alzheimer disease
Li et al.
Neurology 2007;69:878-885.
ABSTRACT
| FULL TEXT
Simvastatin Suppresses Self-Renewal of Mouse Embryonic Stem Cells by Inhibiting RhoA Geranylgeranylation
Lee et al.
Stem Cells 2007;25:1654-1663.
ABSTRACT
| FULL TEXT
The effects of commonly prescribed drugs in patients with Alzheimer's disease on the rate of deterioration
Ellul et al.
J. Neurol. Neurosurg. Psychiatry 2007;78:233-239.
ABSTRACT
| FULL TEXT
Clinical practice with anti-dementia drugs: a consensus statement from British Association for Psychopharmacology.
Burns and O'Brien
J Psychopharmacol 2006;20:732-755.
ABSTRACT
Therapeutic approaches to Alzheimer's disease
Klafki et al.
Brain 2006;129:2840-2855.
ABSTRACT
| FULL TEXT
Statins and Cancer Risk: A Literature-Based Meta-Analysis and Meta-Regression Analysis of 35 Randomized Controlled Trials
Bonovas et al.
JCO 2006;24:4808-4817.
ABSTRACT
| FULL TEXT
Regulation of Steady-state beta-Amyloid Levels in the Brain by Neprilysin and Endothelin-converting Enzyme but Not Angiotensin-converting Enzyme
Eckman et al.
J. Biol. Chem. 2006;281:30471-30478.
ABSTRACT
| FULL TEXT
Mechanisms for cellular cholesterol transport: defects and human disease.
Ikonen
Physiol. Rev. 2006;86:1237-1261.
ABSTRACT
| FULL TEXT
Simvastatin-Induced Decline in Cognition
Padala et al.
The Annals of Pharmacotherapy 2006;40:1880-1883.
ABSTRACT
| FULL TEXT
High-dose statin treatment does not alter plasma marker for brain cholesterol metabolism in patients with moderately elevated plasma cholesterol levels.
Thelen et al.
J Clin Pharmacol 2006;46:812-816.
ABSTRACT
| FULL TEXT
Brain Cholesterol Synthesis in Mice Is Affected by High Dose of Simvastatin but Not of Pravastatin
Thelen et al.
J. Pharmacol. Exp. Ther. 2006;316:1146-1152.
ABSTRACT
| FULL TEXT
The Lipoprotein Receptor LR11 Regulates Amyloid beta Production and Amyloid Precursor Protein Traffic in Endosomal Compartments
Offe et al.
J. Neurosci. 2006;26:1596-1603.
ABSTRACT
| FULL TEXT
Treating vascular risk factors and maintaining vascular health: Is this the way towards successful cognitive ageing and preventing cognitive decline?
Alagiakrishnan et al.
Postgrad. Med. J. 2006;82:101-105.
ABSTRACT
| FULL TEXT
Apolipoprotein (apo) E4 enhances amyloid {beta} peptide production in cultured neuronal cells: ApoE structure as a potential therapeutic target
Ye et al.
Proc. Natl. Acad. Sci. USA 2005;102:18700-18705.
ABSTRACT
| FULL TEXT
Lipid lowering agents are associated with a slower cognitive decline in Alzheimer's disease
Masse et al.
J. Neurol. Neurosurg. Psychiatry 2005;76:1624-1629.
ABSTRACT
| FULL TEXT
Use of Statins and Breast Cancer: A Meta-Analysis of Seven Randomized Clinical Trials and Nine Observational Studies
Bonovas et al.
JCO 2005;23:8606-8612.
ABSTRACT
| FULL TEXT
Statins and cognitive function in the elderly: The Cardiovascular Health Study
Bernick et al.
Neurology 2005;65:1388-1394.
ABSTRACT
| FULL TEXT
Translational Research on the Way to Effective Therapy for Alzheimer Disease
Rosenberg
Arch Gen Psychiatry 2005;62:1186-1192.
ABSTRACT
| FULL TEXT
The Potential Relevance of the Multiple Lipid-Independent (Pleiotropic) Effects of Statins in the Management of Acute Coronary Syndromes
Ray and Cannon
J Am Coll Cardiol 2005;46:1425-1433.
ABSTRACT
| FULL TEXT
Serum cholesterol and risk of Alzheimer disease: A community-based cohort study
Li et al.
Neurology 2005;65:1045-1050.
ABSTRACT
| FULL TEXT
Mechanisms of Statin-mediated Inhibition of Small G-protein Function
Cordle et al.
J. Biol. Chem. 2005;280:34202-34209.
ABSTRACT
| FULL TEXT
Statin Use and the Risk of Incident Dementia: The Cardiovascular Health Study
Rea et al.
Arch Neurol 2005;62:1047-1051.
ABSTRACT
| FULL TEXT
High total cholesterol levels in late life associated with a reduced risk of dementia
Mielke et al.
Neurology 2005;64:1689-1695.
ABSTRACT
| FULL TEXT
Statins Cause Intracellular Accumulation of Amyloid Precursor Protein, {beta}-Secretase-cleaved Fragments, and Amyloid {beta}-Peptide via an Isoprenoid-dependent Mechanism
Cole et al.
J. Biol. Chem. 2005;280:18755-18770.
ABSTRACT
| FULL TEXT
APOE genotype, cholesterol level, lipid-lowering treatment, and dementia: The Three-City Study
Dufouil et al.
Neurology 2005;64:1531-1538.
ABSTRACT
| FULL TEXT
Lipid homeostasis and apolipoprotein E in the development and progression of Alzheimer's disease
Lane and Farlow
J. Lipid Res. 2005;46:949-968.
ABSTRACT
| FULL TEXT
Association of active {gamma}-secretase complex with lipid rafts
Urano et al.
J. Lipid Res. 2005;46:904-912.
ABSTRACT
| FULL TEXT
Atorvastatin for the Treatment of Mild to Moderate Alzheimer Disease: Preliminary Results
Sparks et al.
Arch Neurol 2005;62:753-757.
ABSTRACT
| FULL TEXT
Optimal lipids, statins, and dementia
Lavie and Milani
J Am Coll Cardiol 2005;45:963-964.
FULL TEXT
Cholesterol and apolipoprotein E in Alzheimer's disease
Reiss
AM J ALZHEIMERS DIS OTHER DEMEN 2005;20:91-96.
ABSTRACT
Do Statins Reduce Risk of Incident Dementia and Alzheimer Disease?: The Cache County Study
Zandi et al.
Arch Gen Psychiatry 2005;62:217-224.
ABSTRACT
| FULL TEXT
Chronic Administration of Statins Alters Multiple Gene Expression Patterns in Mouse Cerebral Cortex
Johnson-Anuna et al.
J. Pharmacol. Exp. Ther. 2005;312:786-793.
ABSTRACT
| FULL TEXT
3-Hydroxy-3-Methylglutaryl-Coenzyme A Reductase Inhibitors Attenuate {beta}-Amyloid-Induced Microglial Inflammatory Responses
Cordle and Landreth
J. Neurosci. 2005;25:299-307.
ABSTRACT
| FULL TEXT
Mixed Dementia: Emerging Concepts and Therapeutic Implications
Langa et al.
JAMA 2004;292:2901-2908.
ABSTRACT
| FULL TEXT
Neuronal membrane cholesterol loss enhances amyloid peptide generation
Abad-Rodriguez et al.
JCB 2004;167:953-960.
ABSTRACT
| FULL TEXT
A lipid boundary separates APP and secretases and limits amyloid {beta}-peptide generation
Kaether and Haass
JCB 2004;167:809-812.
ABSTRACT
| FULL TEXT
Inhibition of Geranylgeranylation Mediates the Effects of 3-Hydroxy-3-methylglutaryl (HMG)-CoA Reductase Inhibitors on Microglia
Bi et al.
J. Biol. Chem. 2004;279:48238-48245.
ABSTRACT
| FULL TEXT
Statin therapy and risk of dementia in the elderly: A community-based prospective cohort study
Li et al.
Neurology 2004;63:1624-1628.
ABSTRACT
| FULL TEXT
Enzyme blockade: a nonradioactive method to determine the absolute rate of cholesterol synthesis in the brain
Keller et al.
J. Lipid Res. 2004;45:1952-1957.
ABSTRACT
| FULL TEXT
ApoAI Deficiency Results in Marked Reductions in Plasma Cholesterol But No Alterations in Amyloid-{beta} Pathology in a Mouse Model of Alzheimer's Disease-Like Cerebral Amyloidosis
Fagan et al.
Am. J. Pathol. 2004;165:1413-1422.
ABSTRACT
| FULL TEXT
Differential Expression of Cholesterol Hydroxylases in Alzheimer's Disease
Brown et al.
J. Biol. Chem. 2004;279:34674-34681.
ABSTRACT
| FULL TEXT
The Risk of Cancer in Users of Statins
Graaf et al.
JCO 2004;22:2388-2394.
ABSTRACT
| FULL TEXT
Hypercholesterolemia, HMG-CoA Reductase Inhibitors, and Risk of Intracerebral Hemorrhage: A Case-Control Study
Woo et al.
Stroke 2004;35:1360-1364.
ABSTRACT
| FULL TEXT
Statin Therapy: Having the Good Without the Bad
Liao
Hypertension 2004;43:1171-1172.
FULL TEXT
Dietary fat intake and 6-year cognitive change in an older biracial community population
Morris et al.
Neurology 2004;62:1573-1579.
ABSTRACT
| FULL TEXT
Relation of Plasma Lipids to Alzheimer Disease and Vascular Dementia
Reitz et al.
Arch Neurol 2004;61:705-714.
ABSTRACT
| FULL TEXT
Brain Cholesterol: Long Secret Life Behind a Barrier
Bjorkhem and Meaney
Arterioscler. Thromb. Vasc. Bio. 2004;24:806-815.
ABSTRACT
| FULL TEXT
Plasma Levels of {beta}-Amyloid(1-40), {beta}-Amyloid(1-42), and Total {beta}-Amyloid Remain Unaffected in Adult Patients With Hypercholesterolemia After Treatment With Statins
Hoglund et al.
Arch Neurol 2004;61:333-337.
ABSTRACT
| FULL TEXT
Young onset dementia
Sampson et al.
Postgrad. Med. J. 2004;80:125-139.
ABSTRACT
| FULL TEXT
Apomine, a Novel Hypocholesterolemic Agent, Accelerates Degradation of 3-Hydroxy-3-methylglutaryl-coenzyme A Reductase and Stimulates Low Density Lipoprotein Receptor Activity
Roitelman et al.
J. Biol. Chem. 2004;279:6465-6473.
ABSTRACT
| FULL TEXT
Involvement of oxidative stress-induced abnormalities in ceramide and cholesterol metabolism in brain aging and Alzheimer's disease
Cutler et al.
Proc. Natl. Acad. Sci. USA 2004;101:2070-2075.
ABSTRACT
| FULL TEXT
Dietary intake of fatty acids and fish in relation to cognitive performance at middle age
Kalmijn et al.
Neurology 2004;62:275-280.
ABSTRACT
| FULL TEXT
Conceptual Foundations of the UCSD Statin Study: A Randomized Controlled Trial Assessing the Impact of Statins on Cognition, Behavior, and Biochemistry
G |
