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• W2498421627 abstract "Background and Purpose Agmatine, a putative neurotransmitter, plays a vital role in learning and memory. Although it is considered an endogenous ligand of imidazoline receptors, agmatine exhibits high affinity for α‐adrenoceptors, NOS and NMDA receptors. These substrates within the locus coeruleus (LC) are critically involved in learning and memory processes. Experimental Approach The hippocampus and LC of male Wistar rat were stereotaxically cannulated for injection. Effects of agmatine, given i.p. or intra‐LC, on acquisition, consolidation and retrieval of inhibitory avoidance (IA) memory were measured. The NO donor S‐nitrosoglutathione, non‐specific (L‐NAME) and specific NOS inhibitors (L‐NIL, 7‐NI, L‐NIO), the α 2 ‐adrenoceptor antagonist (yohimbine) or the corresponding agonist (clonidine) were injected intra‐LC before agmatine. Intra‐hippocampal injections of the NMDA antagonist, MK‐801 (dizocilpine), were used to modify the memory enhancing effects of agmatine, SNG and yohimbine. Expression of tyrosine hydroxylase (TH) and eNOS in the LC was assessed immunohistochemically. Key Results Agmatine (intra‐LC or i.p.) facilitated memory retrieval in the IA test. S‐nitrosoglutathione potentiated, while L‐NAME and L‐NIO decreased, these effects of agmatine. L‐NIL and 7‐NI did not alter the effects of agmatine. Yohimbine potentiated, whereas clonidine attenuated, effects of agmatine within the LC. The effects of agmatine, S‐nitrosoglutathione and yohimbine were blocked by intra‐hippocampal MK‐801. Agmatine increased the population of TH‐ and eNOS‐immunoreactive elements in the LC. Conclusions and Implications The facilitation of memory retrieval in the IA test by agmatine is probably mediated by interactions between eNOS, NO and noradrenergic pathways in the LC." @default.
• W2498421627 created "2016-08-23" @default.
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• W2498421627 date "2016-08-01" @default.
• W2498421627 modified "2023-10-14" @default.
• W2498421627 title "Interactions of nitric oxide with α₂-adrenoceptors within the locus coeruleus underlie the facilitation of inhibitory avoidance memory by agmatine" @default.
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• W2498421627 doi "https://doi.org/10.1111/bph.13531" @default.
• W2498421627 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4978159" @default.
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