Effect of hormone replacement therapy on amyloid beta (Aß) plaque density in the rhesus macaque amygdala.
Front Aging Neurosci
; 15: 1326747, 2023.
Article
em En
| MEDLINE
| ID: mdl-38274989
ABSTRACT
Background:
Amyloid beta (Aß) plaque density was examined in the amygdala of rhesus macaques, to elucidate the influence of age, diet and hormonal environment.Methods:
Luminex technology was used to measure cerebrospinal fluid (CSF) concentrations of Aß40 and Aß42 across three decades, while immunohistochemistry was used to examine Aß plaque density in the amygdala.Results:
Aß40 was found to be the predominant isoform of Aß in the CSF, but neither Aß40 or Aß42 concentrations showed an age-related change, and the ratio of Aß42 to Aß40 showed only a marginal increase. Significantly fewer Aß plaques were detected in the amygdala of old ovariectomized animals if they received estradiol HRT (p < 0.001); similar results were obtained regardless of whether they had been maintained on a regular monkey chow for â¼48 months or on a high-fat, high-sugar, Western-style diet for â¼30 months.Conclusion:
The results demonstrate that HRT involving estrogen can reduce Aß plaque load in a cognitive brain region of aged non-human primates. The results from this translational animal model may therefore have clinical relevance to the treatment of AD in post-menopausal women, whether used alone, or as a supplement to current pharmacological and monoclonal antibody-based interventions.
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Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article
País de afiliação:
Estados Unidos