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Zhou YS, Tao HB, Lv SS, Liang KQ, Shi WY, Liu KY, Li YY, Chen LY, Zhou L, Yin SJ, Zhao QR. Effects of Kv1.3 knockout on pyramidal neuron excitability and synaptic plasticity in piriform cortex of mice. Acta Pharmacol Sin 2024; 45:2045-2060. [PMID: 38862816 PMCID: PMC11420205 DOI: 10.1038/s41401-024-01275-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2023] [Accepted: 03/24/2024] [Indexed: 06/13/2024] Open
Abstract
Kv1.3 belongs to the voltage-gated potassium (Kv) channel family, which is widely expressed in the central nervous system and associated with a variety of neuropsychiatric disorders. Kv1.3 is highly expressed in the olfactory bulb and piriform cortex and involved in the process of odor perception and nutrient metabolism in animals. Previous studies have explored the function of Kv1.3 in olfactory bulb, while the role of Kv1.3 in piriform cortex was less known. In this study, we investigated the neuronal changes of piriform cortex and feeding behavior after smell stimulation, thus revealing a link between the olfactory sensation and body weight in Kv1.3 KO mice. Coronal slices including the anterior piriform cortex were prepared, whole-cell recording and Ca2+ imaging of pyramidal neurons were conducted. We showed that the firing frequency evoked by depolarization pulses and Ca2+ influx evoked by high K+ solution were significantly increased in pyramidal neurons of Kv1.3 knockout (KO) mice compared to WT mice. Western blotting and immunofluorescence analyses revealed that the downstream signaling molecules CaMKII and PKCα were activated in piriform cortex of Kv1.3 KO mice. Pyramidal neurons in Kv1.3 KO mice exhibited significantly reduced paired-pulse ratio and increased presynaptic Cav2.1 expression, proving that the presynaptic vesicle release might be elevated by Ca2+ influx. Using Golgi staining, we found significantly increased dendritic spine density of pyramidal neurons in Kv1.3 KO mice, supporting the stronger postsynaptic responses in these neurons. In olfactory recognition and feeding behavior tests, we showed that Kv1.3 conditional knockout or cannula injection of 5-(4-phenoxybutoxy) psoralen, a Kv1.3 channel blocker, in piriform cortex both elevated the olfactory recognition index and altered the feeding behavior in mice. In summary, Kv1.3 is a key molecule in regulating neuronal activity of the piriform cortex, which may lay a foundation for the treatment of diseases related to piriform cortex and olfactory detection.
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Affiliation(s)
- Yong-Sheng Zhou
- Department of Chemical Biology, School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan, 430074, China
| | - Hao-Bo Tao
- Department of Chemical Biology, School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan, 430074, China
| | - Si-Si Lv
- Department of Chemical Biology, School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan, 430074, China
| | - Ke-Qin Liang
- Department of Chemical Biology, School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan, 430074, China
| | - Wen-Yi Shi
- Department of Chemical Biology, School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan, 430074, China
| | - Ke-Yi Liu
- Department of Chemical Biology, School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan, 430074, China
| | - Yun-Yun Li
- Department of Chemical Biology, School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan, 430074, China
| | - Lv-Yi Chen
- Department of Chemical Biology, School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan, 430074, China
| | - Ling Zhou
- Department of Chemical Biology, School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan, 430074, China
| | - Shi-Jin Yin
- Department of Chemical Biology, School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan, 430074, China.
| | - Qian-Ru Zhao
- Department of Chemical Biology, School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan, 430074, China.
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Traub RD, Tu Y, Whittington MA. Cell assembly formation and structure in a piriform cortex model. Rev Neurosci 2021; 33:111-132. [PMID: 34271607 DOI: 10.1515/revneuro-2021-0056] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2021] [Accepted: 06/19/2021] [Indexed: 11/15/2022]
Abstract
The piriform cortex is rich in recurrent excitatory synaptic connections between pyramidal neurons. We asked how such connections could shape cortical responses to olfactory lateral olfactory tract (LOT) inputs. For this, we constructed a computational network model of anterior piriform cortex with 2000 multicompartment, multiconductance neurons (500 semilunar, 1000 layer 2 and 500 layer 3 pyramids; 200 superficial interneurons of two types; 500 deep interneurons of three types; 500 LOT afferents), incorporating published and unpublished data. With a given distribution of LOT firing patterns, and increasing the strength of recurrent excitation, a small number of firing patterns were observed in pyramidal cell networks: first, sparse firings; then temporally and spatially concentrated epochs of action potentials, wherein each neuron fires one or two spikes; then more synchronized events, associated with bursts of action potentials in some pyramidal neurons. We suggest that one function of anterior piriform cortex is to transform ongoing streams of input spikes into temporally focused spike patterns, called here "cell assemblies", that are salient for downstream projection areas.
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Affiliation(s)
- Roger D Traub
- AI Foundations, IBM T.J. Watson Research Center, Yorktown Heights, NY10598, USA
| | - Yuhai Tu
- AI Foundations, IBM T.J. Watson Research Center, Yorktown Heights, NY10598, USA
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Bekkers JM. Autaptic Cultures: Methods and Applications. Front Synaptic Neurosci 2020; 12:18. [PMID: 32425765 PMCID: PMC7203343 DOI: 10.3389/fnsyn.2020.00018] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2019] [Accepted: 04/01/2020] [Indexed: 11/13/2022] Open
Abstract
Neurons typically form daisy chains of synaptic connections with other neurons, but they can also form synapses with themselves. Although such self-synapses, or autapses, are comparatively rare in vivo, they are surprisingly common in dissociated neuronal cultures. At first glance, autapses in culture seem like a mere curiosity. However, by providing a simple model system in which a single recording electrode gives simultaneous access to the pre- and postsynaptic compartments, autaptic cultures have proven to be invaluable in facilitating important and elegant experiments in the area of synaptic neuroscience. Here, I provide detailed protocols for preparing and recording from autaptic cultures (also called micro-island or microdot cultures). Variations on the basic procedure are presented, as well as practical tips for optimizing the outcomes. I also illustrate the utility of autaptic cultures by reviewing the types of experiments that have used them over the past three decades. These examples serve to highlight the power and elegance of this simple model system, and will hopefully inspire new experiments for the interrogation of synaptic function.
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Affiliation(s)
- John M Bekkers
- Eccles Institute of Neuroscience, The John Curtin School of Medical Research, The Australian National University, Canberra, ACT, Australia
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Lunelli L, Collini C, Jimenez-Garduño A, Roncador A, Giusti G, Verucchi R, Pasquardini L, Iannotta S, Macchi P, Lorenzelli L, Pederzolli C, Musio C, Potrich C. Prototyping a memristive-based device to analyze neuronal excitability. Biophys Chem 2019; 253:106212. [DOI: 10.1016/j.bpc.2019.106212] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Accepted: 06/20/2019] [Indexed: 12/31/2022]
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