Estrogen replacement regimen and brain infusion of lipopolysaccharide differentially alter steroid receptor expression in the uterus and hypothalamus

L. K. Marriott, K. R. McGann-Gramling, B. Hauss-Wegrzyniak, L. C. Sheldahl, R. A. Shapiro, D. M. Dorsa, G. L. Wenk

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

The regimen of estrogen replacement can alter the consequences of estrogen therapy and stressors. To determine the long-term effects and interaction of these systems on the brain and periphery, adult female rats were infused with lipopolysaccharide (LPS) into the fourth ventricle of the brain for 4 weeks, and ovariectomized rats were administered either constant or pulsed regimens of estrogen replacement (17β-estradiol) until sacrifice at 8 weeks. Constant, but not pulsed, estrogen replacement reduced ERα and increased HSP90, HSP70, and PR B uterine protein levels. Both estrogen regimens increased ERβ, HSP27, and PR A uterine proteins. Both regimens reduced hypothalamic levels of ERα, but not ERβ, HSP, or PR. No changes were observed in the hippocampus. Long-term brain infusion of LPS activated microglia and reduced body weight, but did not alter corticosterone or nitrotyrosine levels. LPS infusion into intact rats suppressed uterine weight, increased ERα and decreased HSP90 in the uterus. LPS did not alter uterine weight in ovariectomized rats treated with constant or pulsed estrogen. Together, these data suggest the timing of estrogen replacement and neuroinflammatory stressors can profoundly affect uterine and hypothalamic steroid receptor expression and may be important parameters to consider in the post-menopausal intervention with estrogen.

Original languageEnglish (US)
Pages (from-to)317-328
Number of pages12
JournalEndocrine
Volume32
Issue number3
DOIs
StatePublished - Dec 1 2007

Keywords

  • Estrogen receptor (ER; ERα (ESR1), ERβ (ESR2))
  • Estrous cycle
  • Fluctuating regimen
  • Heat shock protein (HSP; HSP90 (HSPAA1), HSP70 (HSPA1B), HSP27 (HSPB2))
  • Lipopolysaccharide (LPS)
  • Progesterone receptor (PGR; PR , PR )

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Endocrinology

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