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Cholecystokinin in the mouse hippocampus: localization in the mossy fiber and dentate commissural systems

Summary

The distribution and source of cholecystokinin-like immunoreactivity (CCK-I) in the hippocampus of the Swiss Webster mouse was analyzed using light microscopic immunocytochemical techniques. In agreement with what has been observed in other animals, CCK-I was localized within sparsely scattered neurons throughout the hippocampus proper, in axons that arborize within and around stratum pyramidale, and in fine axons and puncta in stratum lacunosum-moleculare of region CA1. In contrast to other animals, CCK-I was also localized within the mossy fiber system (including dentate gyrus granule cells), within a dense band which occupied the full septo-temporal extent of the dentate gyrus inner molecular layer, and within polymorph neurons of the central hilus. The presence of CCK-I within the latter two areas suggested localization within the dentate gyrus commissural system. This was verified by the combined use of retrograde fluorescent dye transport and CCK immunocytochemistry. Virtually all of the dyelabeled dentate commissural neurons within the hilus were CCK-I. These data demonstrate that while there is little change in the distribution of CCK-I within hippocampal local circuit neurons across animals, there are substantial interspecies differences in the localization of CCK-I within major axonal projections in the hippocampal formation.

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Correspondence to C. Gall.

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Gall, C., Berry, L.M. & Hodgson, L.A. Cholecystokinin in the mouse hippocampus: localization in the mossy fiber and dentate commissural systems. Exp Brain Res 62, 431–437 (1986). https://doi.org/10.1007/BF00238862

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Key words

  • Cholecystokinin
  • Hippocampus
  • Dentate gyrus
  • Mossy fibers
  • Neuropeptides