Neuroanatomical distribution of the enkephalinergic and tachykininergic systems in the alpaca brainstem: An immunohistochemical study

Pablo Sánchez, Manuel Lisardo Sánchez*, Arturo Mangas, Eliana de Souza, Luis Angel Aguilar, Rafael Coveñas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Introduction. A recent study has shown a close neuroanatomical relationship between the enkephalinergic (methionine-enkephalin) and tachykininergic (substance P) systems in the alpaca diencephalon. In this study, our aim is to show this relationship in the alpaca brainstem. Material and methods. Using an immunohistochemical technique, the distribution of immunoreactive (Ir) fibers and cell bodies containing substance P (SP) or methionine-enkephalin (MET) has been studied in the alpaca brainstem. Five adult males were used; brain tissue was fixed and processed by standard methods. Results. SP-and MET-Ir fibers showed a widespread and similar distribution in the mesencephalon, pons and medulla oblongata. The co-localization of fibers containing SP or MET was found in most of the nuclei/tracts of the alpaca brainstem. This close neuroanatomical relationship suggests multiple physiological interactions between both neuropeptides. The distribution of the cell bodies containing SP was very restricted (cell bodies were only observed in a few nuclei located in the mesencephalon and medulla oblongata), whereas MET-Ir perikarya showed a moderately widespread distribution in the mesencephalon, pons and medulla oblongata. Conclusions. This study increases the knowledge on the neuroanatomical distribution/relationship of the tachy-kininergic (SP) and enkephalinergic (MET) systems in the alpaca central nervous system.

Original languageEnglish
Pages (from-to)145-156
Number of pages12
JournalFolia Histochemica et Cytobiologica
Volume59
Issue number3
DOIs
StatePublished - 30 Sep 2021

Keywords

  • Lama pacos, IHC
  • Medulla oblongata
  • Mesencephalon
  • Methionine-enkephalin
  • Pons
  • Substance P

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