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Rijal S, Jang SH, Park SJ, Han SK. Lithium Enhances the GABAergic Synaptic Activities on the Hypothalamic Preoptic Area (hPOA) Neurons. Int J Mol Sci 2021; 22:3908. [PMID: 33918982 PMCID: PMC8069239 DOI: 10.3390/ijms22083908] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 04/06/2021] [Accepted: 04/08/2021] [Indexed: 12/12/2022] Open
Abstract
Lithium (Li+) salt is widely used as a therapeutic agent for treating neurological and psychiatric disorders. Despite its therapeutic effects on neurological and psychiatric disorders, it can also disturb the neuroendocrine axis in patients under lithium therapy. The hypothalamic area contains GABAergic and glutamatergic neurons and their receptors, which regulate various hypothalamic functions such as the release of neurohormones, control circadian activities. At the neuronal level, several neurotransmitter systems are modulated by lithium exposure. However, the effect of Li+ on hypothalamic neuron excitability and the precise action mechanism involved in such an effect have not been fully understood yet. Therefore, Li+ action on hypothalamic neurons was investigated using a whole-cell patch-clamp technique. In hypothalamic neurons, Li+ increased the GABAergic synaptic activities via action potential independent presynaptic mechanisms. Next, concentration-dependent replacement of Na+ by Li+ in artificial cerebrospinal fluid increased frequencies of GABAergic miniature inhibitory postsynaptic currents without altering their amplitudes. Li+ perfusion induced inward currents in the majority of hypothalamic neurons independent of amino-acids receptor activation. These results suggests that Li+ treatment can directly affect the hypothalamic region of the brain and regulate the release of various neurohormones involved in synchronizing the neuroendocrine axis.
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Affiliation(s)
| | | | | | - Seong Kyu Han
- Department of Oral Physiology, School of Dentistry & Institute of Oral Bioscience, Jeonbuk National University, Jeonju 54896, Korea; (S.R.); (S.H.J.); (S.J.P.)
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Sani G, Simonetti A, Janiri D, Banaj N, Ambrosi E, De Rossi P, Ciullo V, Arciniegas DB, Piras F, Spalletta G. Association between duration of lithium exposure and hippocampus/amygdala volumes in type I bipolar disorder. J Affect Disord 2018; 232:341-348. [PMID: 29510351 DOI: 10.1016/j.jad.2018.02.042] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Revised: 01/17/2018] [Accepted: 02/16/2018] [Indexed: 02/07/2023]
Abstract
BACKGROUND Prior studies on the effects of lithium on limbic and subcortical gray matter volumes are mixed. It is possible that discrepant findings may be explained by the duration of lithium exposure. We investigated this issue in individuals with type I bipolar disorder (BP-I). METHODS Limbic and subcortical gray matter volume was measured using FreeSurfer in 60 subjects: 15 with BP-I without prior lithium exposure [no-exposure group (NE)]; 15 with BP-I and lithium exposure < 24 months [short-exposure group (SE)]; 15 with BP-I and lithium exposure > 24 months [long-exposure group (LE)]; and 15 healthy controls (HC). RESULTS No differences in limbic and subcortical gray matter volumes were found between LE and HC. Hippocampal and amygdalar volumes were larger bilaterally in both LE and HC when compared to NE. Amygdalar volumes were larger bilaterally in SE when compared to NE but did not differ from LE. Hippocampal volumes were smaller bilaterally in SE when compared to LE and HC but did not differ from NE. No between-group differences on subcortical gray matter or other limbic structure volumes were observed. LIMITATIONS Cross-sectional design and concurrent treatment with other medications limit attribution of between-group differences to lithium exposure alone. CONCLUSIONS The effect of lithium exposure on limbic and subcortical gray matter volumes appears to be time-dependent and relatively specific to the hippocampus and the amygdala, with short-term effects on the amygdala and long-term effects on both structures. These results support the clinical importance of long-term lithium treatment in BP-I.
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Affiliation(s)
- Gabriele Sani
- NESMOS Department (Neurosciences, Mental Health, and Sensory Organs), Sapienza University of Rome, School of Medicine and Psychology, Sant'Andrea Hospital, Rome, Italy; Centro Lucio Bini, Rome, Italy; School of Medicine, Mood Disorder Program, Tufts University, Boston, MA, USA
| | - Alessio Simonetti
- Department of Neurology and Psychiatry, Sapienza University of Rome, Rome, Italy; Centro Lucio Bini, Rome, Italy; Menninger Department of Psychiatry and Behavioral Sciences, Baylor College of Medicine, Houston, TX, USA
| | - Delfina Janiri
- Psychiatry Residency Training Program, Faculty of Medicine and Psychology, Sapienza University of Rome, Italy
| | - Nerisa Banaj
- IRCCS Santa Lucia Foundation, Laboratory of Neuropsychiatry, Rome, Italy
| | - Elisa Ambrosi
- Menninger Department of Psychiatry and Behavioral Sciences, Baylor College of Medicine, Houston, TX, USA; IRCCS Santa Lucia Foundation, Laboratory of Neuropsychiatry, Rome, Italy
| | - Pietro De Rossi
- NESMOS Department (Neurosciences, Mental Health, and Sensory Organs), Sapienza University of Rome, School of Medicine and Psychology, Sant'Andrea Hospital, Rome, Italy; Department of Neurology and Psychiatry, Sapienza University of Rome, Rome, Italy
| | - Valentina Ciullo
- IRCCS Santa Lucia Foundation, Laboratory of Neuropsychiatry, Rome, Italy; Neurosciences, Psychology, Drug Research and Child Health (NEUROFARBA), University of Florence, 50139 Italy
| | - David B Arciniegas
- Menninger Department of Psychiatry and Behavioral Sciences, Baylor College of Medicine, Houston, TX, USA; Departments of Neurology and Psychiatry, University of Colorado School of Medicine, Aurora, CO, USA
| | - Fabrizio Piras
- IRCCS Santa Lucia Foundation, Laboratory of Neuropsychiatry, Rome, Italy
| | - Gianfranco Spalletta
- Menninger Department of Psychiatry and Behavioral Sciences, Baylor College of Medicine, Houston, TX, USA; IRCCS Santa Lucia Foundation, Laboratory of Neuropsychiatry, Rome, Italy.
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Wakita M, Nagami H, Takase Y, Nakanishi R, Kotani N, Akaike N. Modifications of excitatory and inhibitory transmission in rat hippocampal pyramidal neurons by acute lithium treatment. Brain Res Bull 2015; 117:39-44. [PMID: 26247839 DOI: 10.1016/j.brainresbull.2015.07.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Revised: 07/24/2015] [Accepted: 07/28/2015] [Indexed: 11/25/2022]
Abstract
The acute effects of high-dose Li(+) treatment on glutamatergic and GABAergic transmissions were studied in the "synaptic bouton" preparation of isolated rat hippocampal pyramidal neurons by using focal electrical stimulation. Both action potential-dependent glutamatergic excitatory and GABAergic inhibitory postsynaptic currents (eEPSC and eIPSC, respectively) were dose-dependently inhibited in the external media containing 30-150 mM Li(+), but the sensitivity for Li(+) was greater tendency for eEPSCs than for eIPSCs. When the effects of Li(+) on glutamate or GABAA receptor-mediated whole-cell responses (IGlu and IGABA) elicited by an exogenous application of glutamate or GABA were examined in the postsynaptic soma membrane of CA3 neurons, Li(+) slightly inhibited both IGlu and IGABA at the 150 mM Li(+) concentration. Present results suggest that acute treatment with high concentrations of Li(+) acts preferentially on presynaptic terminals, and that the Li(+)-induced inhibition may be greater for excitatory than for inhibitory transmission.
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Affiliation(s)
- Masahito Wakita
- Research Division for Clinical Pharmacology, Medical Corporation, Juryokai, Kumamoto Kinoh Hospital, 6-8-1, Yamamuro, Kita-ku, Kumamoto 860-8518, Japan
| | - Hideaki Nagami
- Research Division for Clinical Pharmacology, Medical Corporation, Juryokai, Kumamoto Kinoh Hospital, 6-8-1, Yamamuro, Kita-ku, Kumamoto 860-8518, Japan
| | - Yuko Takase
- Research Division for Clinical Pharmacology, Medical Corporation, Juryokai, Kumamoto Kinoh Hospital, 6-8-1, Yamamuro, Kita-ku, Kumamoto 860-8518, Japan
| | - Ryoji Nakanishi
- Research Division for Clinical Pharmacology, Medical Corporation, Juryokai, Kumamoto Kinoh Hospital, 6-8-1, Yamamuro, Kita-ku, Kumamoto 860-8518, Japan
| | - Naoki Kotani
- Research Division of Neurophysiology, Kitamoto Hospital, 3-7-6, Kawarasone, Koshigaya 343-0821, Japan
| | - Norio Akaike
- Research Division for Clinical Pharmacology, Medical Corporation, Juryokai, Kumamoto Kinoh Hospital, 6-8-1, Yamamuro, Kita-ku, Kumamoto 860-8518, Japan; Research Division of Neurophysiology, Kitamoto Hospital, 3-7-6, Kawarasone, Koshigaya 343-0821, Japan; Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto 862-0973, Japan.
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Coincidence detection and stress modulation of spike time-dependent long-term depression in the hippocampus. J Neurosci 2010; 30:6225-35. [PMID: 20445048 DOI: 10.1523/jneurosci.6411-09.2010] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Associative long-term depression (LTD) in the hippocampus is a form of spike time-dependent synaptic plasticity that is induced by the asynchronous pairing of postsynaptic action potentials and EPSPs. Although metabotropic glutamate receptors (mGluRs) and postsynaptic Ca(2+) signaling have been suggested to mediate associative LTD, mechanisms are unclear further downstream. Here we show that either mGluR1 or mGluR5 activation is necessary for LTD induction, which is therefore mediated by group I mGluRs. Inhibition of postsynaptic phospholipase C, inositol-1,4,5-trisphosphate, and PKC prevents associative LTD. Activation of PKC by a phorbol ester causes a presynaptic potentiation of synaptic responses and facilitates LTD induction by a postsynaptic mechanism. Lithium, an inhibitor of the PKC pathway, inhibits LTD and the presynaptic and postsynaptic effects of the phorbol ester. Furthermore, LTD is sensitive to the postsynaptic application of synthetic peptides that inhibit the interaction of AMPA receptors with PDZ domains, suggesting an involvement of protein interacting with C-kinase 1 (PICK1)-mediated receptor endocytosis. Finally, enhanced PKC phosphorylation, induced by behavioral stress, is associated with enhanced LTD. Both increased PKC phosphorylation and stress-induced LTD facilitation can be reversed by lithium, indicating that this clinically used mood stabilizer may act on synaptic depression via PKC modulation. These data suggest that PKC mediates the expression of associative LTD via the PICK1-dependent internalization of AMPA receptors. Moreover, modulation of the PKC activity adjusts the set point for LTD induction in a behavior-dependent manner.
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Valentín A, Garcia-Seoane JJ, Colino A. Lithium enhances synaptic transmission in neonatal rat hippocampus. Neuroscience 1997; 78:385-91. [PMID: 9145795 DOI: 10.1016/s0306-4522(96)00618-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The effects of lithium on excitatory synaptic transmission were studied in the CA1 region of hippocampal slices taken from 14- to 30-day-old rats using extracellular recording techniques. Lithium (2-18 mM) reversibly increased the field excitatory postsynaptic potentials in a concentration-dependent manner. Application of lithium for 6-15 min had no effect on the synaptic input-output function, while application of lithium for 20-35 min shifted this curve to the left. Lithium reversibly increased the amplitude of the presynaptic fibre volley in a concentration- and calcium-dependent manner. Lithium decreased paired-pulse facilitation measured at 50-ms interstimulus intervals. The results indicate that lithium enhances excitatory synaptic transmission in CA1 pyramidal cells by at least two different actions.
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Affiliation(s)
- A Valentín
- Departamento de Fisiologia, Facultad de Medicina, Universidad Complutense, Ciudad Universitaria, Madrid, Spain
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