In Vivo Detection of Fluctuating Brain Steroid Levels in Zebra Finches
- 1Neuroscience and Behavior Program, Center for Neuroendocrine Studies, University of Massachusetts, Amherst, Massachusetts 01003;
- 2Department of Integrative Biology and Physiology, University of California, Los Angeles, Los Angeles, California 90095;
- 3Molecular and Cellular Biology Program, University of Massachusetts, Amherst, Massachusetts 01003
Abstract
This protocol describes a method for the in vivo measurement of steroid hormones in brain circuits of the zebra finch. A guide cannula is surgically implanted into the skull, microdilysate is collected through a microdialysis probe that is inserted into the cannula, and steroid concentrations in the microdialysate are determined using the enzyme-linked immunosorbent assay (ELISA). In some cases, the steroids measured are derived locally (e.g., neural estrogens in males), whereas in other cases, the steroids measured reflect systemic circulating levels and/or central conversion (e.g., the primary androgen testosterone and the primary glucocorticoid corticosterone). A reverse-microdialysis (“retrodialysis”) method that can be used to deliver pharmacological agents into the brain to influence local steroid neurochemistry as well as behavior is also discussed.
Footnotes
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↵3 Correspondence: healey{at}cns.umass.edu
- © 2014 Cold Spring Harbor Laboratory Press
