Plastic rearrangement of basal forebrain parvalbumin-immunoreactive neurons in the kainite model of epilepsy

• Type: Article in International Scientific Journal
• Date: 2023

Authors

Carvalho, R (Author) Other; Lukoyanova, AN (Author) Other; Casalta Lopes, J (Author) Other; Lukoyanov, NV (Author) FMUP; Soares, JI (Author) Other

Journal

Title: AIMS Neuroscience

Vol. 10

Pages: 300-314

Publisher: AIMS Press

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 0 Citations

Other information

Authenticus ID: P-00Z-G3B

DOI: 10.3934/neuroscience.2023023

Abstract (EN): Temporal lobe epilepsy (TLE) is the most prevalent form of epilepsy, through the neuronal mechanisms of this syndrome remain elusive. In addition to the temporal lobe structures, it was found that the basal forebrain cholinergic cells are also involved in epileptogenesis. However, little is known about the involvement of the basal forebrain GABAergic neurons in epilepsy; despite this, they largely project to the temporal lobe and are crucial for the regulation of the hippocampal circuitry. In this study, we assessed epilepsy-induced changes in parvalbumin (PARV) immunoreactive neurons of the medial septum (MS) and of the magnocellular preoptic nucleus (MCPO) using the kainic acid (KA) model in rats. In addition, we estimated the respective changes in the cholinergic varicosities in the MS, where we observed a significant reduction in the PARV cell number (12849 +/- 2715 vs. 9372 +/- 1336, p = .029) and density (16.2 +/- 2.62 vs. 10.5 +/- 1.00 per .001 mm3, p =.001), and an increase in the density of cholinergic varicosities (47.9 +/- 11.1 vs. 69.4 +/- 17.8 per 30,000 mu m2, p =.036) in KA-treated animals. In the MCPO, these animals showed a significant increase in somatic volume (827.9 +/- 235.2 mu m3 vs. 469.9 +/- 79.6 mu m3, p = .012) and total cell number (2268.6 +/- 707.1 vs. 1362.4 +/- 262.0, p =.028). These results show that the basal forebrain GABAergic cell populations undergo numerical and morphological changes in epileptic animals, which may contribute to an increased vulnerability of brain circuits to epilepsy and epilepsy-related functional impairments.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 15