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Effect of Hormone Replacement Therapy in Normalizing Age Related Neuronal Markers in Different Age Groups of Naturally Menopausal Rats

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Abstract

Aging of the normal brain is accompanied by changes in its structure, function, and metabolism. There are significant gender differences in aging brain. Most of these changes increase during menopausal condition in females when the level of estradiol and progesterone are decreased. The objective of this study was to determine the effect of estradiol and progesterone (separate as well as combined) hormones in neuronal tissues from naturally menopausal rats of different age groups. Results show decreased activity of Acetylcholine esterase (AChE) whereas the level of lipid peroxidation increased with age, and after the hormone treatments both AChE activity and level of lipid peroxidation returned to control values. The deposition of lipofuscin, a pigment that accumulated intraneuronally in brain and other tissues and is considered a marker of aging, was increased with aging and the hormone treatment decreased this deposition. The present study clearly shows reduction in risk factors associated with aging in the murine model system by hormone treatments, namely estrogen and progesterone by increasing the activity of acetylcholine esterase and decreasing the levels of lipid peroxidation and lipofuscin deposition in different parts of aging brain. This study suggests that hormone replacement therapy may either reduce or delay the onset of age related diseases like Alzheimer’s, Parkinson’s and other neurological disorders.

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Abbreviations

AChE:

acetylcholine esterase

HRT:

hormonal replacement therapy

LP:

lipid peroxide

MDA:

malondialdehyde

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Authors and Affiliations

  1. School of Life Sciences, Jawaharlal Nehru University, 110 067, New Delhi, India

    K. Moorthy, M. R. Siddiqui, Anil K. Mantha, D. Sharma, Sudha M. Cowsik & Najma Z. Baquer

  2. Department of HBC&G, University of Texas Medical Branch, 77550, Galveston, TX, USA

    Umesh C. S. Yadav

  3. Department of Biosciences, Jamia Millia Islamia University, New Delhi, India

    Seemi F. Basir

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  1. K. Moorthy
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  2. Umesh C. S. Yadav
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  3. M. R. Siddiqui
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  6. D. Sharma
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  7. Sudha M. Cowsik
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  8. Najma Z. Baquer
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Correspondence to Najma Z. Baquer.

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Moorthy, K., Yadav, U.C.S., Siddiqui, M.R. et al. Effect of Hormone Replacement Therapy in Normalizing Age Related Neuronal Markers in Different Age Groups of Naturally Menopausal Rats. Biogerontology 6, 345–356 (2005). https://doi.org/10.1007/s10522-005-4810-6

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