Publication Date


Document Type


Committee Members

Dragana Claflin (Advisor), Dragana Claflin (Committee Member), Timothy Cope (Other), Michael Hennessy (Committee Member), Andrew Hsu (Other), Larry Ream (Committee Member)

Degree Name

Master of Science (MS)


Exogenous glucocorticoids are commonly used in modern medications and animal studies examining the effects of glucocorticoids on the developing brain report inconsistent results. Recent reports have questioned the reliability of available drug delivery methods in mice (Herrmann et al., 2009). In our laboratory, variable behavioral results using trace eyeblink conditioning (EBC) suggest that we may be having similar problems delivering glucoroticoids to developing rat pups (Claflin et al., 2005, 2011). Subcutaneous pellets and osmotic minipumps resulted in impaired learning during trace eyeblink conditioning whereas subcutaneous injection of corticosterone (CORT) resulted in facilitation of learning on the same task. One of the possible mechanisms for CORT-induced cognitive effects may be changes to hippocampal development, specifically neurogenesis. We examined potential differences in hippocampal neurogenesis for rats subjected to elevated CORT levels as in the aforementioned behavioral studies. For the present report, exogenous administration of CORT was achieved using subcutaneous pellets. CORT- treated males showed significantly less neurogenesis than the CORT treated females. Furthermore, males of the control group showed significantly more neurogenesis than the females.

Page Count


Department or Program

Department of Neuroscience, Cell Biology & Physiology

Year Degree Awarded


Included in

Anatomy Commons