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Description Estradiol is a human sex hormone and steroid, and the primary female sex hormone.
In Vitro Estradiol induces new dendritic spines and synapses on hippocampal CA1 pyramidal cells. Estradiol treatment resulted in a 46% increase in NMDA receptor binding. Estradiol treatment increases NMDA receptor binding in parallel with dendritic spine and synapse density. Estradiol treatment results in increased sensitivity of CA1 pyramidal cells to NMDA receptor-mediated synaptic input and that this increase is well correlated with the estradiol-induced increase in dendritic spine density in the apical dendritic tree of these cells[1]. Estradiol is found to reduce Ba2+ entry reversibly via Ca2+ channels in acutely dissociated and cultured neostriatal neurons. Estradiol also reduces Ba2+ currents but is significantly less effective than Estradiol in rat neostriatal neurons[2]. Estradiol exerts a dose-dependent inhibition of IL-1-, TNF-, and IL-1 and TNF-induced production of bioassayable IL-6. Estradiol inhibits both TNF-induced IL-6 production and osteoclast development in primary bone cell cultures derived from neonatal murine calvaria[3].
In Vivo Estradiol mediates fluctuation in hippocampal synapse density during the estrous cycle in the adult rat[4]. Estradiol alone can reverse the ovariectomy-induced decrease in spine density. Estradiol combined with Progesterone initially increases spine density for a period of 2 to 6 hours but then results in a much sharper decrease than is observed following estradiol alone[5].
Preparing Stock Solutions
Concentration Volume Mass 1 mg 5 mg 10 mg


1 mM 3.6713 mL 18.3567 mL 36.7134 mL
5 mM 0.7343 mL 3.6713 mL 7.3427 mL
10 mM 0.3671 mL 1.8357 mL 3.6713 mL

Please refer to the solubility information to select the appropriate solvent.

Cell Assay
Estradiol is dissolved in 0.01% ethanol.

Briefly, B9 cells (5×103/well of a 96-well plate) are cultured with a series of dilutions of the supernatants in a final volume of 100 mL of RPMI 1640, supplemented with 5×10-5mol/Lof 2-mercaptoethanol, 10% FBS, 100 U/mL penicillin, and 100 μg/mL streptomycin in flat-bottom microtiter plates. After 42 h, 0.5 μCi of [3H]thymidine is added. 6 h later, the cells are harvested and the radioactivity incorporated is determined. IL-6 is quantitated from a standard curve set up with known amounts of recombinant human or mouse IL-6. The anti-IL-6 monoclonal antibody completely inhibited the ability of the B9 cells to proliferate in response to recombinant mouse IL-6. In addition, we determined that B9 cells do not proliferate in response to IL-I or TNF, and that antibodies to these two cytokines did not affect the cell proliferation in response to IL-6. Further, it is established that neither Estradiol (17β-estradiol), nor the 0.01% ethanol used as vehicle in these experiments, has any effect on the bioassay. MCE has not independently confirmed the accuracy of these methods. They are for reference only.

Animal Administration
Estradiol is formulated in sesame oil.

Adult female Sprague Dawley rats are housed on a 12 hr light/dark cycle with unlimited access to food and water. These animals are left gonadally intact (intact), ovariectomized and treated with estradiol benzoate (OVX+E), or ovariectomized and treated with sesame oil vehicle (OVX+O). The hormone treatment regimen that is used in these experiments has been shown previously to result in differences in CA1 pyramidal cell dendritic spine and synapse density. Six days before electrophysiological analysis, animals are ovariectomized under Metofane anesthesia using aseptic surgical procedure. After surgery, animals are housed individually. On days 3 and 4 after surgery, OVX+E animals are injected (s.c.) with 10 μg of 17β-estradiol benzoate in 100 μL of sesame oil vehicle; OVX+O animalsreceive oil vehicle at each injection time. Forty-eight hours after the second estradiol or vehicle injection, animals are killed by decapitation and hippocampal slices are prepared from their brains. Gonadally intact animals are killed at random stages of the estrous cycle. MCE has not independently confirmed the accuracy of these methods. They are for reference only.

Molecular Weight 272.38
Formula C₁₈H₂₄O₂
CAS No. 50-28-2
Powder -20°C 3 years
  4°C 2 years
In solvent -80°C 6 months
  -20°C 1 month


Shipping Room temperature in continental US; may vary elsewhere
Solvent & Solubility DMSO: ≥150 mg/mL

* “<1 mg/mL” means slightly soluble or insoluble. “≥” means soluble, but saturation unknown.

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Estradiol-COA wharton

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