Postnatal depletion of serotonin affects the morphology of neurons and the function of the hippocampus in male rats. Issue 3 (24th February 2022)

• Record Type: Journal Article
• Authors: Ghaheri, Safa; Niapour, Ali; Sakhaie, Nona; Sadegzadeh, Farshid; Saadati, Hakimeh
• Is Part Of: International journal of developmental neuroscience. Volume 82:Issue 3(2022)
• Page Start: 222
• Page End: 230
• Publication Date: 2022-02-24
• Subjects: hippocampal morphology of neurons -- para‐chlorophenylalanine -- serotonin depletion -- spatial memory; Developmental neurobiology -- Periodicals; Neurology -- Periodicals; Neurologie du développement -- Périodiques; Developmental neurobiology; Periodicals; 612.8
• DOI: 10.1002/jdn.10174
• Languages: English
• ISSNs: 0736-5748

Abstract

Abstract: Serotonin (5‐HT) is an essential neurotransmitter for the refined organization of the cerebral cortex. Studies have suggested that altered serotonin signaling contributes to cognitive impairment and psychiatric disorders. However, the exact role of this neurotransmitter on the development of hippocampal neurons is not recognized. Here we aimed to examine the effects of the para‐chlorophenylalanine (PCPA; 100 mg/kg/daily, s.c. during the postnatal days 10–20), a reversible inhibitor of 5‐HT synthesis, on the serotonin level of the hippocampal and prefrontal cortex. We also focused on the morphology of the neurons in the hippocampus and spatial learning and memory. Our results indicated that the administration of PCPA led to a decrease in serotonin levels in the hippocampus and prefrontal cortex. Postnatal serotonin depletion also induced subtle alterations in the neuronal populations of the hippocampus and impaired spatial memory in the adulthood period of life. We found that critical developmental periods of serotonin depletion caused degeneration and swelling of neurons as well as significant neuronal loss in the hippocampal CA1, CA3, and dentate gyrus (DG) areas. Thus, serotonin, a strikingly important neurotransmitter, can affect neuronal morphology, development, and hippocampal‐dependent memory. Abstract : Here we aimed to examine the effects of the para‐chlorophenylalanine (PCPA; during the postnatal days 10–20, s.c.), a reversible inhibitor of 5‐HT synthesis, on the hippocampal and prefrontal cortex of serotonin levels. We also focused on the morphology of the neurons in the hippocampus and spatial learning and memory.