Abstract
Abstract: This report presents the scientific rationale and hypothesis for the investigator‐initiated, double‐blind, placebo‐controlled Alzheimer's Disease Cholesterol‐Lowering Treatment Trial. As part of the supporting preclinical data, accumulation of neuronal β‐amyloid immunoreactivity was investigated in 12‐month‐old male spontaneously hypercholesterolemic Watanabe rabbits, female Watanabe rabbits between 3 and >36 months of age, and untreated female New Zealand white rabbits between 6 and 12 months of age. Prior evidence suggests that there are significant accumulations of neuronal β‐amyloid immunoreactivity in the cholesterol‐fed New Zealand white rabbit. At 3 months of age, abundant β‐amyloid immunoreactive neurons are also found in female hypercholesterolemic Watanabe rabbits. By 6 months of age, as female Watanabe rabbits are approaching sexual maturity, the number of β‐amyloid immunoreactive neurons was somewhat reduced, but the intensity of the immunoreactivity was clearly and consistently diminished. Very few neurons expressing β‐amyloid immunoreactivity were identifiable among the 12‐month‐old Watanabe female rabbits. Variably increased numbers of intensely stained β‐amyloid immunoreactive neurons were observed in retired breeder female animals over 3 years of age. Twelve‐month‐old male Watanabe rabbits exhibited levels of neuronal β‐amyloid immunoreactivity consistent with younger and older female animals, but greater than the adult 12‐month‐old females. Cholesterol levels in the blood were not noticeably different among females over the age range investigated or compared to 12‐month‐old males. Estrogen levels varied with age in female Watanabe rabbits in an apparent inverse relationship with neuronal β‐amyloid immunoreactivity. However, there was no evidence of increased neuronal β‐amyloid immunoreactivity in untreated female New Zealand white rabbits with “normal” circulating cholesterol levels at any age investigated. Therefore, under conditions of stable, but elevated, circulating cholesterol levels, pathologic accumulation of neuronal β‐amyloid immunoreactivity was similar in male Watanabe rabbits and female animals prior and subsequent to estrus. The intensity of observable neuronal β‐amyloid immunoreactivity accumulation decreases in female animals as circulating estrogen levels increased with sexual maturity. These data suggest that a loss of circulating estrogen could mark the collapse of a system previously protecting a female from conditions conducive to production of β‐amyloid as a putative neurotoxin in AD. This may, in part, explain the epidemiological evidence for “protective” effects of estrogen in AD.
References
55
Referenced
18
10.1016/0197-4580(90)90024-T
10.1097/00005072-199303000-00006
10.1111/j.1749-6632.1997.tb48466.x
{'key': 'e_1_2_6_5_2', 'first-page': '255', 'article-title': 'Dietary cholesterol induces Alzheimer‐like β‐amyloid immunoreactivity in rabbit brain', 'volume': '7', 'author': 'Sparks D.L.', 'year': '1997', 'journal-title': 'Nutr. Metab. Cardiovasc. Dis.'}
/ Nutr. Metab. Cardiovasc. Dis. / Dietary cholesterol induces Alzheimer‐like β‐amyloid immunoreactivity in rabbit brain by Sparks D.L. (1997)10.1006/exnr.1994.1044
10.1111/j.1749-6632.2000.tb06384.x
10.1016/0197-4580(95)02067-5
10.1007/s001090050097
10.1016/0304-3940(95)11357-6
- Sparks D.L. 1999. Neuropathologic links between Alzheimer's disease and vascular disease.InAlzheimer's Disease and Related Disorders pp. 153‐163. Wiley. New York.
10.1074/jbc.271.8.4436
10.1097/00001756-199906030-00014
{'key': 'e_1_2_6_14_2', 'first-page': '16', 'article-title': "Decreased prevalence of Alzheimer's disease associated with HMG‐CoA reductase inhibitors", 'volume': '26', 'author': 'Wolozin B.', 'year': '1999', 'journal-title': 'Soc. Neurosci.'}
/ Soc. Neurosci. / Decreased prevalence of Alzheimer's disease associated with HMG‐CoA reductase inhibitors by Wolozin B. (1999){'key': 'e_1_2_6_15_2', 'first-page': 'S281', 'article-title': 'Effect of age and diet on the expression of β‐amyloid 1–40 and 1–42 in the brains of apolipoprotein‐E‐deficient mice', 'volume': '19', 'author': 'Durham R.A.', 'year': '1998', 'journal-title': 'Neurobiol. Aging'}
/ Neurobiol. Aging / Effect of age and diet on the expression of β‐amyloid 1–40 and 1–42 in the brains of apolipoprotein‐E‐deficient mice by Durham R.A. (1998){'key': 'e_1_2_6_16_2', 'first-page': '1859', 'article-title': "High fat diet potentiates β‐amyloid deposition in the APP V717F transgenic mouse model of Alzheimer's disease", 'volume': '25', 'author': 'Fishman C.E.', 'year': '1999', 'journal-title': 'Soc. Neurosci.'}
/ Soc. Neurosci. / High fat diet potentiates β‐amyloid deposition in the APP V717F transgenic mouse model of Alzheimer's disease by Fishman C.E. (1999){'key': 'e_1_2_6_17_2', 'first-page': '1859', 'article-title': 'Effects of an atherogenic diet on amyloidosis in transgenic mice overexpressing the C‐terminal portion of β‐amyloid precursor protein', 'volume': '25', 'author': 'Li L.', 'year': '1999', 'journal-title': 'Soc. Neurosci.'}
/ Soc. Neurosci. / Effects of an atherogenic diet on amyloidosis in transgenic mice overexpressing the C‐terminal portion of β‐amyloid precursor protein by Li L. (1999){'key': 'e_1_2_6_18_2', 'first-page': '1859', 'article-title': "Effects of cholesterol feeding on histopathologic hallmarks of Alzheimer's disease in β‐amyloid precursor protein (APP) transgenic mice", 'volume': '25', 'author': 'Shie F.S.', 'year': '1999', 'journal-title': 'Soc. Neurosci.'}
/ Soc. Neurosci. / Effects of cholesterol feeding on histopathologic hallmarks of Alzheimer's disease in β‐amyloid precursor protein (APP) transgenic mice by Shie F.S. (1999)10.1016/0014-5793(96)01042-3
10.1523/JNEUROSCI.22-05-01679.2002
10.1006/nbdi.2001.0470
10.1038/ncb1001-905
10.1074/jbc.273.26.16576
10.1006/nbdi.2001.0422
10.1073/pnas.081620098
10.1001/archneur.57.10.1439
10.1016/S0140-6736(00)03155-X
10.1001/archneur.59.3.378
10.1016/0014-5793(80)81223-3
10.1016/S0022-2275(20)37988-8
/ J. Lipid Res. / Cholesterol synthesis in vivo and in vitro in the WHHL rabbit, an animal with defective low density lipoprotein receptors by Dietschy J.M. (1983)10.1016/S0140-6736(96)03356-9
10.1212/WNL.48.6.1517
10.1016/S0002-9378(99)70724-6
10.1001/jama.283.8.1007
10.1212/WNL.54.2.295
10.1212/WNL.57.4.605
10.1001/archneur.59.3.385
10.1507/endocrj.43.737
10.1016/S0378-5122(98)00109-1
{'key': 'e_1_2_6_40_2', 'first-page': '27', 'article-title': 'Prognostic features of menopausal and postmenopausal applicants for life insurance', 'volume': '28', 'author': 'Schiefeling M.', 'year': '1996', 'journal-title': 'J. Insur. Med.'}
/ J. Insur. Med. / Prognostic features of menopausal and postmenopausal applicants for life insurance by Schiefeling M. (1996){'key': 'e_1_2_6_41_2', 'first-page': '13', 'article-title': 'Estrogen increases cerebral and cerebellar blood flows in postmenopausal women', 'volume': '2', 'author': 'Ohkura T.', 'year': '1994', 'journal-title': 'Menopause'}
/ Menopause / Estrogen increases cerebral and cerebellar blood flows in postmenopausal women by Ohkura T. (1994)10.1016/0378-5122(94)90099-X
10.1016/0021-9150(80)90234-8
10.1016/0026-0495(85)90132-5
10.1016/S0026-0495(00)80025-6
{'key': 'e_1_2_6_46_2', 'first-page': '319', 'article-title': 'Hematologic and biochemical profiles of selectively bred WHHL rabbits', 'volume': '43', 'author': 'Norido F.', 'year': '1993', 'journal-title': 'Lab. Anim. Sci.'}
/ Lab. Anim. Sci. / Hematologic and biochemical profiles of selectively bred WHHL rabbits by Norido F. (1993)10.1007/BF02924292
10.1258/002367796780684854
{'key': 'e_1_2_6_49_2', 'first-page': '97', 'article-title': 'Natural history of atherosclerosis and hyperlipidemia in heterozygous WHHL (WHHL‐Hh) rabbits: the effects of aging and gender on plasma lipids and lipoproteins', 'volume': '121', 'author': 'Esper E.', 'year': '1993', 'journal-title': 'J. Lab. Clin. Med.'}
/ J. Lab. Clin. Med. / Natural history of atherosclerosis and hyperlipidemia in heterozygous WHHL (WHHL‐Hh) rabbits: the effects of aging and gender on plasma lipids and lipoproteins by Esper E. (1993)10.1016/S0022-2275(20)40127-0
/ J. Lipid Res. / Aberrant hypothalamic‐pituitary‐ovarian axis in the Watanabe heritable hyperlipidemic rabbit by Robins E.D. (1994)10.1016/S0531-5565(00)00157-1
10.1046/j.0022-3042.2001.00690.x
10.1016/S0304-3940(00)01078-8
10.1016/S0304-3940(01)01896-1
10.1212/WNL.54.4.833
10.1210/jc.86.3.1099
Dates
Type | When |
---|---|
Created | 16 years, 1 month ago (July 9, 2009, 3:51 p.m.) |
Deposited | 1 year, 11 months ago (Sept. 25, 2023, 4:26 a.m.) |
Indexed | 1 year, 11 months ago (Sept. 29, 2023, 12:50 a.m.) |
Issued | 22 years, 10 months ago (Nov. 1, 2002) |
Published | 22 years, 10 months ago (Nov. 1, 2002) |
Published Online | 19 years, 7 months ago (Jan. 24, 2006) |
Published Print | 22 years, 10 months ago (Nov. 1, 2002) |
@article{SPARKS_2002, title={Cholesterol and Cognition: Rationale for the AD Cholesterol‐Lowering Treatment Trial and Sex‐Related Differences in β‐Amyloid Accumulation in the Brains of Spontaneously Hypercholesterolemic Watanabe Rabbits}, volume={977}, ISSN={1749-6632}, url={http://dx.doi.org/10.1111/j.1749-6632.2002.tb04838.x}, DOI={10.1111/j.1749-6632.2002.tb04838.x}, number={1}, journal={Annals of the New York Academy of Sciences}, publisher={Wiley}, author={SPARKS, D. LARRY and MARTINS, RALPH and MARTIN, TIM}, year={2002}, month=nov, pages={356–366} }