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Hung YC, Wu YJ, Chien ME, Lin YT, Tsai CF, Hsu KS. Loss of oxytocin receptors in hilar mossy cells impairs social discrimination. Neurobiol Dis 2023; 187:106311. [PMID: 37769745 DOI: 10.1016/j.nbd.2023.106311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Revised: 09/24/2023] [Accepted: 09/25/2023] [Indexed: 10/02/2023] Open
Abstract
Hippocampal oxytocin receptor (OXTR) signaling is crucial for discrimination of social stimuli to guide social recognition, but circuit mechanisms and cell types involved remain incompletely understood. Here, we report a role for OXTR-expressing hilar mossy cells (MCs) of the dentate gyrus in social stimulus discrimination by regulating granule cell (GC) activity. Using a Cre-loxP recombination approach, we found that ablation of Oxtr from MCs impairs discrimination of social, but not object, stimuli in adult male mice. Ablation of MC Oxtr increases spontaneous firing rate of GCs, synaptic excitation to inhibition ratio of MC-to-GC circuit, and GC firing when temporally associated with the lateral perforant path inputs. Using mouse hippocampal slices, we found that bath application of OXTR agonist [Thr4,Gly7]-oxytocin causes membrane depolarization and increases MC firing activity. Optogenetic activation of MC-to-GC circuit ameliorates social discrimination deficit in MC OXTR deficient mice. Together, our results uncover a previously unknown role of MC OXTR signaling for discrimination of social stimuli and delineate a MC-to-GC circuit responsible for social information processing.
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Affiliation(s)
- Yu-Chieh Hung
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan 70101, Taiwan
| | - Yi-Jen Wu
- Institute of Clinical Medicine, College of Medicine, National Cheng Kung University, Tainan 70457, Taiwan; Department of Neurology, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan 70403, Taiwan
| | - Miao-Er Chien
- Institute of Clinical Medicine, College of Medicine, National Cheng Kung University, Tainan 70457, Taiwan
| | - Yu-Ting Lin
- Institute of Systems Neuroscience, College of Life Science, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Cheng-Fang Tsai
- Department of Physical Medicine and Rehabilitation, Ditmanson Medical Foundation Chia-Yi Christian Hospital, Chiayi 60002, Taiwan; Graduate Institute of Clinical Medical Sciences, College of Medicine, Chang Gung University, Taoyuan 33302, Taiwan.
| | - Kuei-Sen Hsu
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan 70101, Taiwan; Department of Pharmacology, College of Medicine, National Cheng Kung University, Tainan 70101, Taiwan.
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Almeida EDP, Santos Silva LA, de Araujo GRS, Montalvão MM, Matos SS, da Cunha Gonsalves JKM, de Souza Nunes R, de Meneses CT, Oliveira Araujo RG, Sarmento VHV, De Lucca W, Correa CB, Rodrigues JJ, Lira AAM. Chitosan-functionalized nanostructured lipid carriers containing chloroaluminum phthalocyanine for photodynamic therapy of skin cancer. Eur J Pharm Biopharm 2022; 179:221-231. [PMID: 36122783 DOI: 10.1016/j.ejpb.2022.09.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Revised: 08/19/2022] [Accepted: 09/12/2022] [Indexed: 11/26/2022]
Abstract
The objective of this study was to obtain optimized nanostructured lipid carriers (NLC) functionalized with chitosan containing chloroaluminum phthalocyanine (ClAlPc) as a photosensitizer. Initially, the optimization of the preparation method of the NLC was performed, where the influence of different surfactants such as PVA and Tween 80, as well as different solid lipids such as stearic acid and Glycerol Monostearate (GM) was evaluated. The formulation containing GM and PVA (NLC10) was considered promising. Following, by the adsorption method (NLC10q), the formulation was functionalized with chitosan and characterized. NLC10 and NLC10q presented sizes of 131.5 and 231.5 nm, and ZP of -24.30 and + 19.96 mV, respectively. The encapsulation efficiency of NLC10q was 96 %, higher than NLC10 (79 %). The formulations were able to promote significant cutaneous retention of ClAlPc, after 2 h and 4 h of the study, and showed to be non-toxic to fibroblasts (biocompatible). PDT in BF16-F10 melanoma resulted in reduced cell viability to 70 % and 50 % for NLC10 and NLCq, respectively. In view of the results obtained, NLC showed to be promising in the treatment of skin cancer through PDT. NLC10q showed higher encapsulation efficiency and stability than NLC10, but, contrary to what was expected, it presented lower photodynamic efficiency.
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Affiliation(s)
| | - Luiz André Santos Silva
- Department of Pharmacy, Federal University of Sergipe, São Cristóvão, Sergipe 49100-00, Brazil
| | | | | | - Saulo Santos Matos
- Department of Pharmacy, Federal University of Sergipe, São Cristóvão, Sergipe 49100-00, Brazil
| | | | - Rogéria de Souza Nunes
- Department of Pharmacy, Federal University of Sergipe, São Cristóvão, Sergipe 49100-00, Brazil
| | | | | | | | - Waldecy De Lucca
- Department of Morphology, Federal University of Sergipe, São Cristóvão, Sergipe 49100-000, Brazil
| | - Cristiane Bani Correa
- Department of Morphology, Federal University of Sergipe, São Cristóvão, Sergipe 49100-000, Brazil
| | - José Joatan Rodrigues
- Department of Physics, Federal University of Sergipe, São Cristóvão, Sergipe 49100-000, Brazil
| | - Ana Amélia Moreira Lira
- Department of Pharmacy, Federal University of Sergipe, São Cristóvão, Sergipe 49100-00, Brazil.
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Therapeutic Effects of Quetiapine and 5-HT1A Receptor Agonism on Hyperactivity in Dopamine-Deficient Mice. Int J Mol Sci 2022; 23:ijms23137436. [PMID: 35806448 PMCID: PMC9266854 DOI: 10.3390/ijms23137436] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Revised: 06/30/2022] [Accepted: 06/30/2022] [Indexed: 12/03/2022] Open
Abstract
Some diseases that are associated with dopamine deficiency are accompanied by psychiatric symptoms, including Parkinson’s disease. However, the mechanism by which this occurs has not been clarified. Previous studies found that dopamine-deficient (DD) mice exhibited hyperactivity in a novel environment. This hyperactivity is improved by clozapine and donepezil, which are used to treat psychiatric symptoms associated with dopamine deficiency (PSDD). We considered that DD mice could be used to study PSDD. In the present study, we sought to identify the pharmacological mechanism of PSDD. We conducted locomotor activity tests by administering quetiapine and drugs that have specific actions on serotonin (5-hydroxytryptamine [5-HT]) receptors and muscarinic receptors. Changes in neuronal activity that were induced by drug administration in DD mice were evaluated by examining Fos immunoreactivity. Quetiapine suppressed hyperactivity in DD mice while the 5-HT1A receptor antagonist WAY100635 inhibited this effect. The number of Fos-positive neurons in the median raphe nucleus increased in DD mice that exhibited hyperactivity and was decreased by treatment with quetiapine and 5-HT1A receptor agonists. In conclusion, hyperactivity in DD mice was ameliorated by quetiapine, likely through 5-HT1A receptor activation. These findings suggest that 5-HT1A receptors may play a role in PSDD, and 5-HT1A receptor-targeting drugs may help improve PSDD.
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