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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Differential contribution of H3R antagonism by LINS01 compounds on memory, anxiety-like behaviour and spontaneous locomotor activity in healthy rats

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Author(s):
Soliani, Andressa [1] ; Kubota, Silvia Megumi [1] ; Correa, Michelle Fidelis [2] ; Cerutti, Suzete Maria [1] ; Fernandes, Joao Paulo S. [2]
Total Authors: 5
Affiliation:
[1] Univ Fed Sao Paulo, Dept Biol Sci, Cellular & Behav Pharmacol Lab, Rua Sao Nicolau 210, BR-09913030 Diadema, SP - Brazil
[2] Univ Fed Sao Paulo, Dept Pharmaceut Sci, Rua Sao Nicolau 210, BR-09913030 Diadema, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Behavioural Brain Research; v. 377, JAN 13 2020.
Web of Science Citations: 0
Abstract

Histamine H-3 receptors (H3R) have attracted interest of research groups as drug target to several CNS disorders. Data suggests that H3R antagonists exert neuroprotective, cognitive enhancement and antidepressant effects in rodents. The LINS01 compounds were reported as selective H3R antagonists, but their effects on memory, anxiety-like behaviour and spontaneous locomotor activity were not evaluated to date. Therefore, this study employed the plus-maze discriminative avoidance task (PM-DAT) to assess concomitantly the effects of LINS01 compounds on short- and long-term memory, anxiety-like behaviour and spontaneous locomotor activity. Thirtyeight adult male Wistar rats were divided into five groups (n= 7-8 per group) according to the treatment. The animals were treated with donepezil (1 mg/kg) and clobenpropit (3 mg/kg) (reference compounds), and with two LINS01 compounds at doses of 5 mg/kg (LINS01003 and LINS01004), and then submitted to the PM-DAT protocol. Saline (vehicle) was used as control group. The behavioural data showed that anxiety-like behaviour, spontaneous locomotor activity and memory effects (short- and long-term) were not affected by the treatment with LINS01004 or clobenpropit. Conversely, treatment with LINS01003 and donepezil impaired the maintenance of discriminative avoidance long-term memory, a hippocampal-dependent memory. Donepezil-treated rats also showed decreased spontaneous locomotor activity and anxiolytic-like effects. In summary, considering that hippocampal damage and memory impairment are associated with Alzheimer's disease (AD), this work brought important findings regarding the contribution of the histamine system to the effects of LINS01 compounds on memory, anxiety and motility, and suggests that H3R antagonism had no effects on anxiety-like behaviour and do not impair discriminative avoidance memory. Furthermore, the findings herein raise new questions about donepezil's function in an ``impaired{''} system such as AD, since it prevented the long-term memory formation in healthy rats. (AU)

FAPESP's process: 16/18039-9 - Participation of the hippocampal formation in acquisition, consolidation, evocation and extinction on conditioned suppression: clinical correlations
Grantee:Suzete Maria Cerutti
Support type: Regular Research Grants
FAPESP's process: 16/25028-3 - Antihistamines H3R/H4R as procognitive agents: a multitarget approach
Grantee:João Paulo dos Santos Fernandes
Support type: Regular Research Grants
FAPESP's process: 16/23139-2 - Synthesis and biological evaluation of the LINS01 series as procognitive agents: a multitarget approach
Grantee:Michelle Fidelis Corrêa
Support type: Scholarships in Brazil - Doctorate