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Effects of diet-induced hypercholesterolemia on amyloid accumulation in ovariectomized mice

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Abstract

A central hypothesis in the study of Alzheimer’s disease (AD) is the accumulation and aggregation of β-amyloid peptide (Aβ). Recent epidemiological studies suggest that patients with elevated cholesterol and decreased estrogen levels are more susceptible to AD through Aβ accumulation. To test the above hypothesis, we used ovariectomized with diet-induced hypercholesterolemia (OVX) and hypercholesterolemia (HCL) diet alone mouse models. HPLC analysis reveals the presence of beta amyloid in the OVX and HCL mice brain. Congo red staining analysis revealed the extent of amyloid deposition in OVX and hypercholesterolemia mice brain. Overall, Aβ levels were higher in OVX mice than in HCL. Secondly, estrogen receptors α (ERα) were assessed by immunohistochemistry and this suggested that there was a decreased expression of ER α in OVX animals when compared to hypercholesterolemic animals. Aβ was quantified by Western blot and ELISA analysis. Overall, Aβ levels were higher in OVX mice than in HCL mice. Our experimental results suggested that OVX animals were more susceptible to AD with significant increase in Aβ peptide.

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Authors and Affiliations

  1. Department of Bio-Organic and Neurochemistry Laboratory, Central Leather Research Institute, Chennai, 600 020, India

    V Kaliyamurthi

  2. Department of Biochemistry, Sairam Advanced Centre for Research, Chennai, 600 044, India

    V Kaliyamurthi, V Thanigavelan & G Victor Rajamanickam

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  1. V Kaliyamurthi
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  2. V Thanigavelan
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  3. G Victor Rajamanickam
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Correspondence to V Kaliyamurthi.

Additional information

Corresponding editor: Vidita A Vaidya

MS received 29 September 2011; accepted 09 August 2012

Corresponding editor: Vidita A Vaidya

[Kaliyamurthi V, Thanigavelan V and Rajamanickam GV 2012 Effects of diet-induced hypercholesterolemia on amyloid accumulation in ovariectomized mice. J. Biosci. 37 1–11] DOI 10.1007/s12038-012-9262-y

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Kaliyamurthi, V., Thanigavelan, V. & Rajamanickam, G.V. Effects of diet-induced hypercholesterolemia on amyloid accumulation in ovariectomized mice. J Biosci 37 (Suppl 1), 1017–1027 (2012). https://doi.org/10.1007/s12038-012-9262-y

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  • DOI: https://doi.org/10.1007/s12038-012-9262-y

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