Cellular and Molecular Neurobiology

, Volume 17, Issue 2, pp 157–169

At Least Three Neurotransmitter Systems Mediate a Stress-Induced Increase in c-fos mRNA in Different Rat Brain Areas

  • E. Bozas
  • N. Tritos
  • H. Phillipidis
  • F. Stylianopoulou
Article

DOI: 10.1023/A:1026309727518

Cite this article as:
Bozas, E., Tritos, N., Phillipidis, H. et al. Cell Mol Neurobiol (1997) 17: 157. doi:10.1023/A:1026309727518

Abstract

1. Protooncogene c-fos mRNA levels were determined in the rat cerebral cortex, hippocampus, and cerebellum after exposure to a combined forced swimming and confinement stress. The stress resulted in an increase in c-fos mRNA levels in all three brain areas.

2. In an effort to elucidate the neurotransmitter systems involved in this stress-induced increase, animals were injected, prior to exposure to the stress, with either diazepam, MK-801, or propranolol.

3. In both the cerebral cortex and the hippocampus the stress-induced increase in c-fos mRNA was inhibited by MK-801, suggesting that it is mediated via NMDA receptors. In the hippocampus, propranolol had a similar effect, indicating that β-adrenergic receptors are also involved in the stress-induced increase in c-fos mRNA.

4. On the other hand, the increase in c-fos mRNA produced by the stress of the injection was inhibited in the cerebral cortex by diazepam or propranolol and in the hippocampus only by diazepam. Furthermore, administration of MK-801 resulted in an increase in c-fos mRNA in the hippocampus of the nonstressed animals. In the cerebellum no one of the three drugs employed affected c-fos mRNA levels in either stressed or nonstressed animals.

5. Our results thus show that various forms of stress activate, in different brain areas, neurons with either NMDA, β-adrenergic, and/or GABA-A receptors.

c-fosstressprotooncogenegene transcriptionmRNANMDA receptorsβ-adrenergic receptorsdiazepam

Copyright information

© Plenum Publishing Corporation 1997

Authors and Affiliations

  • E. Bozas
    • 1
  • N. Tritos
    • 1
  • H. Phillipidis
    • 1
  • F. Stylianopoulou
    • 1
  1. 1.Laboratory of Biology-Biochemistry, Faculty of NursingUniversity of AthensAthensGreece