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Related Experiment Videos

Phytoestrogens decrease brain calcium-binding proteins but do not alter hypothalamic androgen metabolizing enzymes in

E D Lephart1, J M Thompson, K D Setchell

  • 1Neuroscience Center, 633 WIDB, Brigham Young University, Provo, UT 84602, USA. edwin_lephart@byu.edu

Brain Research
|March 18, 2000
PubMed
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Dietary phytoestrogens increase in the brain and plasma, but decrease brain calcium-binding proteins like calbindin in male rats. This occurs without altering key androgen metabolizing enzymes in the CNS.

Area of Science:

  • Neuroendocrinology
  • Molecular Neuroscience
  • Dietary Science

Background:

  • Phytoestrogens, plant compounds with estrogen-like activity, are increasingly researched for health benefits.
  • Their impact on the central nervous system (CNS), particularly neuroendocrine and neuroprotective pathways, remains largely unexplored.
  • Androgen metabolizing enzymes and calcium-binding proteins are crucial for neuroendocrine function and neuroprotection, respectively.

Purpose of the Study:

  • To investigate the effects of dietary phytoestrogens on androgen metabolizing enzyme activity and calcium-binding protein levels in specific brain regions of male rats.
  • To determine if phytoestrogens cross the blood-brain barrier and accumulate in the CNS.

Main Methods:

  • Male rats were fed either a phytoestrogen-free (P-free) or a phytoestrogen-containing (P-600) diet for approximately 5 weeks.

Related Experiment Videos

  • Enzyme activities of aromatase and 5alpha-reductase were measured in the medial basal hypothalamic and preoptic area (mbh-poa).
  • Western analysis was used to quantify calbindin and calretinin protein levels in the mbh-poa and amygdala (amy).

    • Main Results:

    • Phytoestrogen consumption significantly elevated plasma and brain phytoestrogen levels, confirming passage into the CNS.
    • No significant changes were observed in brain aromatase or 5alpha-reductase enzyme activities between diet groups.
    • A significant decrease in calbindin levels was observed in both mbh-poa and amy of rats fed the phytoestrogen-containing diet.
    • Calretinin levels remained unchanged in the mbh-poa but showed a pattern similar to calbindin in the amygdala.

    Conclusions:

    • Short-term dietary phytoestrogen intake effectively increases phytoestrogen concentrations in both plasma and brain tissue.
    • Phytoestrogens significantly reduce the levels of brain calcium-binding proteins, suggesting a potential impact on neuronal function and protection.
    • Dietary phytoestrogens do not appear to alter the activity of key androgen metabolizing enzymes in the studied brain regions.