Rat hippocampal mossy fibers contain cholecystokinin-like immunoreactivity

✍ Scribed by Chandy, Joby ;Pierce, Joseph P. ;Milner, Teresa A.

• Book ID: 102744835
• Publisher: John Wiley and Sons
• Year: 1995
• Tongue: English
• Weight: 689 KB
• Volume: 243
• Category: Article
• ISSN: 0003-276X
• DOI: 10.1002/ar.1092430415

✦ Synopsis

Background: The possibility that mossy fiber endings in the rat hippocampal formation may contain cholecystokinin (CCK) was reexamined.

Methods: For this, CCK-immunoreactivity was examined by light and electron microscopy using the avidin-biotin complex method.

Results: At the light level, the topographical distribution of perikarya and processes with CCK-like immunoreactivity (CCK-LI) was similar to that previously described by others. Ultrastructural analysis of the dentate gyrus and CA3 region of the hippocampus revealed that some mossy fiber terminals contained CCK-LI most often affiliated with large, dense-core vesicles (DCV). Quantitative analysis revealed that 443% of the mossy terminal profiles examined (n = 350) contained CCK-labeled DCVs, which corresponded to 0.03-0.2 labeled DCVs per 100 Fm2 of neuropil.

Conclusions: The presence of CCK-LI within mossy fibers in the rat suggests that there is less species variability in peptide expression in this pathway than formerly believed.