Journal
JOURNAL OF NEUROSCIENCE
Volume 27, Issue 42, Pages 11442-11450Publisher
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.2505-07.2007
Keywords
medial prefrontal cortex; methamphetamine; self-administration; Ki-67; bromodeoxyuridine; voluntary exercise
Categories
Funding
- NICHD NIH HHS [R29 HD036460-05, R01 HD036460, HD36460, R29 HD036460] Funding Source: Medline
- NIDA NIH HHS [R01 DA016765-04, R01 DA010072, DA010072, R01 DA016765, R01 DA010072-09A2, K02 DA023555, DA016765] Funding Source: Medline
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Psychostimulant abuse produces deficits in prefrontal cortex (PFC) function, whereas physical activity improves PFC-dependent cognition and memory. The present study explored the vulnerability of medial PFC (mPFC) precursor proliferation and survival to methamphetamine self-administration and voluntary exercise, factors that may have opposing effects on mPFC plasticity to facilitate functional consequences. Intermittent 1 h access to methamphetamine (I-ShA) increased, but daily 1 and 6 h access decreased, proliferation and survival, with dose-dependent effects on mature cell phenotypes. All groups showed increased cell death. Voluntary exercise enhanced proliferation and survival but, in contrast to methamphetamine exposure, did not alter cell death or mature phenotypes. Furthermore, enhanced cell survival by I-ShA and voluntary exercise had profound effects on gliogenesis with differential regulation of oligodendrocytes versus astrocytes. In addition, new cells in the adult mPFC stain for the neuronal marker neuronal nuclear protein, although enhanced cell survival by I-ShA and voluntary exercise did not result in increased neurogenesis. Our findings demonstrate that mPFC gliogenesis is vulnerable to psychostimulant abuse and physical activity with distinct underlying mechanisms. The susceptibility of mPFC gliogenesis to even modest doses of methamphetamine could account for the pronounced pathology linked to psychostimulant abuse.
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