J Vet Sci.  2004 Dec;5(4):303-307.

Distribution of trkA in cerebral cortex and diencephalon of the mongolian gerbil after birth

  • 1Angio Lab, Inc., Daejeon 302-735, Korea.
  • 2College of Veterinary Medicine, Chungnam National University, Daejeon 305-764, Korea. mgkim@cnu.ac.kr
  • 3College of Oriental Medicine, Daejeon University, Daejeon 302-716, Korea.
  • 4Department of Life Science, KOSEF, Daejeon 305-350, Korea.
  • 5Chungnam Livestock & Veterinary Service Institute, Gongju 314-140, Korea.
  • 6Department of Anatomy, College of Medicine, Chungnam National University, Daejeon 301-130, Korea.


TrkA is essential components of the high-affinity NGF receptor necessary to mediate biological effects of the neurotrophins NGF. Here we report on the expression of trkA in the cerebral cortex and diencephalon of mongolian gerbils during postnatal development. The expression of trkA was identified by immunohistochemical method. In parietal cortex and piriform cortex, higher levels of trkA-IR (immunoreactivity) were detected at 3 days postnatal (P3) and at P9. Although trkA was not expressed till P3 in the parietal cortex, it was detectable at birth in the piriform cortex. Several regions, such as Layers I, IV & VI, did not show much expression. Layer I showed especially weak labeling. In the hippocampus, thalamus, and hypothalamus, higher levels of trkA-IR were detected at P6 and P12 than earlier days. But trkA was not expressed at birth in the hippocampus, at P3 in the reticular thalamic nucleus (Rt), or neonatally in the dorsomedial hypothalamic nucleus (DM). This data shows that expression of trkA is developmentally regulated and suggests that high affinity neurotrophin-receptors mediate a transient response to neurotrophines in the cerebral cortex and diencephalon during mongolian gerbil brain ontogeny.


trkA; NGF; mongolian gerbil; cerebral cortex; diencephalon

MeSH Terms

Animals, Newborn
Cerebral Cortex/*metabolism
Nerve Growth Factor/metabolism
Receptor, trkA/*metabolism
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