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- W1977830005 abstract "Abstract Because the estrogen-based hormone therapy (HT) in postmenopausal women typically contains a progestogen component, understanding the interactions between estrogens and progestogens is critical for optimizing the potential neural benefits of HT. An important issue in this regard is the use of continuous vs discontinuous hormone treatments. Although sex steroid hormone levels naturally exhibit cyclic fluctuation, many HT formulations include continuous delivery of hormones. Recent findings from our laboratory and others have shown that coadministration of progesterone (P4) can either attenuate or augment beneficial actions of 17β-estradiol (E2) in experimental models depending in part upon the delivery schedule of P4. In this study, we demonstrate that the P4 delivery schedule in combined E2 and P4 treatments alters degenerative and regenerative outcomes of unilateral entorhinal cortex lesion. We assessed how lesion-induced degeneration of layer II neurons in entorhinal cortex layer and deafferentation in dentate gyrus are affected by ovariectomy and treatments with E2 alone or in combination with either continuous or discontinuous P4. Our results demonstrate the combined efficacy of E2 and P4 is dependent on the administration regimen. Importantly, the discontinuous-combined E2+P4 regimen had the greatest neuroprotective efficacy for both end points. These data extend a growing literature that indicates qualitative differences in the neuroprotective effects of E2 as a function of cotreatment with continuous versus discontinuous P4, the understanding of which has important implications for HT in postmenopausal women." @default.
- W1977830005 created "2016-06-24" @default.
- W1977830005 creator A5007207994 @default.
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- W1977830005 date "2015-03-01" @default.
- W1977830005 modified "2023-10-16" @default.
- W1977830005 title "Impact of Continuous Versus Discontinuous Progesterone on Estradiol Regulation of Neuron Viability and Sprouting After Entorhinal Cortex Lesion in Female Rats" @default.
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- W1977830005 doi "https://doi.org/10.1210/en.2014-1216" @default.
- W1977830005 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4330320" @default.
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- W1977830005 hasPublicationYear "2015" @default.
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