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Deem JD, Tingley D, Watts CA, Ogimoto K, Bryan CL, Phan BAN, Damian V, Bruchas MR, Scarlett JM, Schwartz MW, Morton GJ. High-fat diet feeding disrupts the coupling of thermoregulation to energy homeostasis. Mol Metab 2023; 78:101835. [PMID: 37931788 PMCID: PMC10681932 DOI: 10.1016/j.molmet.2023.101835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Revised: 10/26/2023] [Accepted: 11/02/2023] [Indexed: 11/08/2023] Open
Abstract
OBJECTIVE Preserving core body temperature across a wide range of ambient temperatures requires adaptive changes of thermogenesis that must be offset by corresponding changes of energy intake if body fat stores are also to be preserved. Among neurons implicated in the integration of thermoregulation with energy homeostasis are those that express both neuropeptide Y (NPY) and agouti-related protein (AgRP) (referred to herein as AgRP neurons). Specifically, cold-induced activation of AgRP neurons was recently shown to be required for cold exposure to increase food intake in mice. Here, we investigated how consuming a high-fat diet (HFD) impacts various adaptive responses to cold exposure as well as the responsiveness of AgRP neurons to cold. METHODS To test this, we used immunohistochemistry, in vivo fiber photometry and indirect calorimetry for continuous measures of core temperature, energy expenditure, and energy intake in both chow- and HFD-fed mice housed at different ambient temperatures. RESULTS We show that while both core temperature and the thermogenic response to cold are maintained normally in HFD-fed mice, the increase of energy intake needed to preserve body fat stores is blunted, resulting in weight loss. Using both immunohistochemistry and in vivo fiber photometry, we show that although cold-induced AgRP neuron activation is detected regardless of diet, the number of cold-responsive neurons appears to be blunted in HFD-fed mice. CONCLUSIONS We conclude that HFD-feeding disrupts the integration of systems governing thermoregulation and energy homeostasis that protect body fat mass during cold exposure.
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Affiliation(s)
- Jennifer D Deem
- University of Washington Medicine Diabetes Institute, Department of Medicine, Seattle, WA, USA
| | - David Tingley
- Beth Israel-Deaconess Medical Center, Harvard University, School of Medicine, Boston, MA, USA
| | - Christina A Watts
- University of Washington Medicine Diabetes Institute, Department of Medicine, Seattle, WA, USA
| | - Kayoko Ogimoto
- University of Washington Medicine Diabetes Institute, Department of Medicine, Seattle, WA, USA
| | - Caeley L Bryan
- University of Washington Medicine Diabetes Institute, Department of Medicine, Seattle, WA, USA
| | - Bao Anh N Phan
- University of Washington Medicine Diabetes Institute, Department of Medicine, Seattle, WA, USA
| | - Vincent Damian
- University of Washington Medicine Diabetes Institute, Department of Medicine, Seattle, WA, USA
| | - Michael R Bruchas
- Department of Anesthesiology and Pain Medicine, University of Washington, Seattle, WA, USA; Department of Pharmacology, University of Washington, Seattle, WA, USA; Center for the Neurobiology of Addiction, Pain, and Emotion, University of Washington, Seattle, WA, USA
| | - Jarrad M Scarlett
- University of Washington Medicine Diabetes Institute, Department of Medicine, Seattle, WA, USA; Department of Pediatric Gastroenterology and Hepatology, Seattle Children's Hospital, Seattle, WA, USA
| | - Michael W Schwartz
- University of Washington Medicine Diabetes Institute, Department of Medicine, Seattle, WA, USA
| | - Gregory J Morton
- University of Washington Medicine Diabetes Institute, Department of Medicine, Seattle, WA, USA.
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2
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Deem JD, Tingley D, Bjerregaard AM, Secher A, Chan O, Uzo C, Richardson NE, Giering E, Doan T, Phan BA, Wu B, Scarlett JM, Morton GJ, Schwartz MW. Identification of Hypothalamic Glucoregulatory Neurons That Sense and Respond to Changes in Glycemia. Diabetes 2023; 72:1207-1213. [PMID: 37347793 PMCID: PMC10450823 DOI: 10.2337/db23-0139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Accepted: 06/19/2023] [Indexed: 06/24/2023]
Abstract
To investigate whether glucoregulatory neurons in the hypothalamus can sense and respond to physiological variation in the blood glucose (BG) level, we combined continuous arterial glucose monitoring with continuous measures of the activity of a specific subset of neurons located in the hypothalamic ventromedial nucleus that express pituitary adenylate cyclase activating peptide (VMNPACAP neurons) obtained using fiber photometry. Data were collected in conscious, free-living mice during a 1-h baseline monitoring period and a subsequent 2-h intervention period during which the BG level was raised either by consuming a chow or a high-sucrose meal or by intraperitoneal glucose injection. Cross-correlation analysis revealed that, following a 60- to 90-s delay, interventions that raise the BG level reliably associate with reduced VMNPACAP neuron activity (P < 0.01). In addition, a strong positive correlation between BG and spontaneous VMNPACAP neuron activity was observed under basal conditions but with a much longer (∼25 min) temporal offset, consistent with published evidence that VMNPACAP neuron activation raises the BG level. Together, these findings are suggestive of a closed-loop system whereby VMNPACAP neuron activation increases the BG level; detection of a rising BG level, in turn, feeds back to inhibit these neurons. To our knowledge, these findings constitute the first evidence of a role in glucose homeostasis for glucoregulatory neurocircuits that, like pancreatic β-cells, sense and respond to physiological variation in glycemia. ARTICLE HIGHLIGHTS By combining continuous arterial glucose monitoring with fiber photometry, studies investigated whether neurons in the murine ventromedial nucleus that express pituitary adenylate cyclase activating peptide (VMNPACAP neurons) detect and respond to changes in glycemia in vivo. VMNPACAP neuron activity rapidly decreases (within <2 min) when the blood glucose level is raised by either food consumption or glucose administration. Spontaneous VMNPACAP neuron activity also correlates positively with glycemia, but with a longer temporal offset, consistent with reports that hyperglycemia is induced by experimental activation of these neurons. Like pancreatic β-cells, neurons in the hypothalamic ventromedial nucleus appear to sense and respond to physiological variation in glycemia.
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Affiliation(s)
- Jennifer D. Deem
- University of Washington Medicine Diabetes Institute, Department of Medicine, University of Washington, Seattle, WA
| | - David Tingley
- Beth Israel-Deaconess Medical Center, Harvard University School of Medicine, Boston, MA
| | | | - Anna Secher
- Data Science Intelligence, Global Drug Discovery, Novo Nordisk A/S, Maaloev, Denmark
| | - Owen Chan
- Department of Internal Medicine, University of Utah, Salt Lake City, UT
| | - Chukwuemeka Uzo
- Department of Internal Medicine, University of Utah, Salt Lake City, UT
| | - Nicole E. Richardson
- University of Washington Medicine Diabetes Institute, Department of Medicine, University of Washington, Seattle, WA
| | - Elizabeth Giering
- University of Washington Medicine Diabetes Institute, Department of Medicine, University of Washington, Seattle, WA
- Veterans Affairs Puget Sound Health Care System, Seattle, WA
| | - Tammy Doan
- University of Washington Medicine Diabetes Institute, Department of Medicine, University of Washington, Seattle, WA
| | - Bao A. Phan
- University of Washington Medicine Diabetes Institute, Department of Medicine, University of Washington, Seattle, WA
| | - Brandon Wu
- University of Washington Medicine Diabetes Institute, Department of Medicine, University of Washington, Seattle, WA
| | - Jarrad M. Scarlett
- University of Washington Medicine Diabetes Institute, Department of Medicine, University of Washington, Seattle, WA
- Division of Pediatric Gastroenterology and Hepatology, Department of Pediatrics, Seattle Children’s Hospital, Seattle, WA
| | - Gregory J. Morton
- University of Washington Medicine Diabetes Institute, Department of Medicine, University of Washington, Seattle, WA
| | - Michael W. Schwartz
- University of Washington Medicine Diabetes Institute, Department of Medicine, University of Washington, Seattle, WA
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3
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Buzsáki G, Tingley D. Cognition from the Body-Brain Partnership: Exaptation of Memory. Annu Rev Neurosci 2023; 46:191-210. [PMID: 36917822 PMCID: PMC10793243 DOI: 10.1146/annurev-neuro-101222-110632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
Abstract
Examination of cognition has historically been approached from language and introspection. However, human language-dependent definitions ignore the evolutionary roots of brain mechanisms and constrain their study in experimental animals. We promote an alternative view, namely that cognition, including memory, can be explained by exaptation and expansion of the circuits and algorithms serving bodily functions. Regulation and protection of metabolic and energetic processes require time-evolving brain computations enabling the organism to prepare for altered future states. Exaptation of such circuits was likely exploited for exploration of the organism's niche. We illustrate that exploration gives rise to a cognitive map, and in turn, environment-disengaged computation allows for mental travel into the past (memory) and the future (planning). Such brain-body interactions not only occur during waking but also persist during sleep. These exaptation steps are illustrated by the dual, endocrine-homeostatic and memory, contributions of the hippocampal system, particularly during hippocampal sharp-wave ripples.
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Affiliation(s)
- György Buzsáki
- Neuroscience Institute and Department of Neurology, NYU Grossman School of Medicine, New York University, New York, NY, USA;
- Center for Neural Science, New York University, New York, NY, USA
| | - David Tingley
- Neuroscience Institute and Department of Neurology, NYU Grossman School of Medicine, New York University, New York, NY, USA;
- Division of Endocrinology, Diabetes and Metabolism, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
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4
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Green L, Tingley D, Rinzel J, Buzsáki G. Action-driven remapping of hippocampal neuronal populations in jumping rats. Proc Natl Acad Sci U S A 2022; 119:e2122141119. [PMID: 35737843 PMCID: PMC9245695 DOI: 10.1073/pnas.2122141119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Accepted: 05/03/2022] [Indexed: 12/24/2022] Open
Abstract
The current dominant view of the hippocampus is that it is a navigation "device" guided by environmental inputs. Yet, a critical aspect of navigation is a sequence of planned, coordinated actions. We examined the role of action in the neuronal organization of the hippocampus by training rats to jump a gap on a linear track. Recording local field potentials and ensembles of single units in the hippocampus, we found that jumping produced a stereotypic behavior associated with consistent electrophysiological patterns, including phase reset of theta oscillations, predictable global firing-rate changes, and population vector shifts of hippocampal neurons. A subset of neurons ("jump cells") were systematically affected by the gap but only in one direction of travel. Novel place fields emerged and others were either boosted or attenuated by jumping, yet the theta spike phase versus animal position relationship remained unaltered. Thus, jumping involves an action plan for the animal to traverse the same route as without jumping, which is faithfully tracked by hippocampal neuronal activity.
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Affiliation(s)
- Laura Green
- Neuroscience Institute, Langone Medical Center, New York University, New York, NY 10016
- Center for Neural Science, New York University, New York, NY 10003
| | - David Tingley
- Neuroscience Institute, Langone Medical Center, New York University, New York, NY 10016
| | - John Rinzel
- Center for Neural Science, New York University, New York, NY 10003
- Courant Institute for Mathematical Sciences, New York University, New York, NY 10012
| | - György Buzsáki
- Neuroscience Institute, Langone Medical Center, New York University, New York, NY 10016
- Center for Neural Science, New York University, New York, NY 10003
- Department of Neurology, Langone Medical Center, New York University, New York, NY 10016
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5
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Tingley D, McClain K, Kaya E, Carpenter J, Buzsáki G. A metabolic function of the hippocampal sharp wave-ripple. Nature 2021; 597:82-86. [PMID: 34381214 PMCID: PMC9214835 DOI: 10.1038/s41586-021-03811-w] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Accepted: 07/07/2021] [Indexed: 02/07/2023]
Abstract
The hippocampus has previously been implicated in both cognitive and endocrine functions1-15. We simultaneously measured electrophysiological activity from the hippocampus and interstitial glucose concentrations in the body of freely behaving rats to identify an activity pattern that may link these disparate functions of the hippocampus. Here we report that clusters of sharp wave-ripples recorded from the hippocampus reliably predicted a decrease in peripheral glucose concentrations within about 10 min. This correlation was not dependent on circadian, ultradian or meal-triggered fluctuations, could be mimicked with optogenetically induced ripples in the hippocampus (but not in the parietal cortex) and was attenuated to chance levels by pharmacogenetically suppressing activity of the lateral septum, which is the major conduit between the hippocampus and the hypothalamus. Our findings demonstrate that a function of the sharp wave-ripple is to modulate peripheral glucose homeostasis, and offer a mechanism for the link between sleep disruption and blood glucose dysregulation in type 2 diabetes16-18.
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Affiliation(s)
- David Tingley
- Neuroscience Institute, New York University, New York, NY, USA.,Correspondence and requests for materials should be addressed to D.T. or G.B. ;
| | - Kathryn McClain
- Center for Neural Science, New York University, New York, NY, USA
| | - Ekin Kaya
- Neuroscience Institute, New York University, New York, NY, USA.,Department of Psychology, Bogazici University, Istanbul, Turkey
| | - Jordan Carpenter
- Neuroscience Institute, New York University, New York, NY, USA.,Kavli Institute for Systems Neuroscience and Centre for Neural Computation, Norwegian University of Science and Technology, Trondheim, Norway
| | - György Buzsáki
- Neuroscience Institute, New York University, New York, NY, USA.,Center for Neural Science, New York University, New York, NY, USA.,Department of Neurology, New York University, New York, NY, USA.,Langone Medical Center, New York University, New York, NY, USA.,Correspondence and requests for materials should be addressed to D.T. or G.B. ;
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6
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Abstract
A major task in the history of neurophysiology has been to relate patterns of neural activity to ongoing external stimuli. More recently, this approach has branched out to relating current neural activity patterns to external stimuli or experiences that occurred in the past or future. Here, we aim to review the large body of methodological approaches used towards this goal, and to assess the assumptions each makes with reference to the statistics of neural data that are commonly observed. These methods primarily fall into two categories, those that quantify zero-lag relationships without examining temporal evolution, termed reactivation, and those that quantify the temporal structure of changing activity patterns, termed replay. However, no two studies use the exact same approach, which prevents an unbiased comparison between findings. These observations should instead be validated by multiple and, if possible, previously established tests. This will help the community to speak a common language and will eventually provide tools to study, more generally, the organization of neuronal patterns in the brain. This article is part of the Theo Murphy meeting issue 'Memory reactivation: replaying events past, present and future'.
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Affiliation(s)
- David Tingley
- Neuroscience Institute, New York University, New York, NY, USA
| | - Adrien Peyrache
- Montreal Neurological Institute, McGill University, Montreal, QC, Canada
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7
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Swanson RA, Levenstein D, McClain K, Tingley D, Buzsáki G. Variable specificity of memory trace reactivation during hippocampal sharp wave ripples. Curr Opin Behav Sci 2020; 32:126-135. [DOI: 10.1016/j.cobeha.2020.02.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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8
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Fernández-Ruiz A, Oliva A, Fermino de Oliveira E, Rocha-Almeida F, Tingley D, Buzsáki G. Long-duration hippocampal sharp wave ripples improve memory. Science 2020; 364:1082-1086. [PMID: 31197012 DOI: 10.1126/science.aax0758] [Citation(s) in RCA: 211] [Impact Index Per Article: 52.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Accepted: 05/01/2019] [Indexed: 01/22/2023]
Abstract
Hippocampal sharp wave ripples (SPW-Rs) have been hypothesized as a mechanism for memory consolidation and action planning. The duration of ripples shows a skewed distribution with a minority of long-duration events. We discovered that long-duration ripples are increased in situations demanding memory in rats. Prolongation of spontaneously occurring ripples by optogenetic stimulation, but not randomly induced ripples, increased memory during maze learning. The neuronal content of randomly induced ripples was similar to short-duration spontaneous ripples and contained little spatial information. The spike content of the optogenetically prolonged ripples was biased by the ongoing, naturally initiated neuronal sequences. Prolonged ripples recruited new neurons that represented either arm of the maze. Long-duration hippocampal SPW-Rs replaying large parts of planned routes are critical for memory.
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Affiliation(s)
- Antonio Fernández-Ruiz
- New York University Neuroscience Institute, New York University, New York, NY 10016, USA
| | - Azahara Oliva
- New York University Neuroscience Institute, New York University, New York, NY 10016, USA.,Department of Neuroscience and Zuckerman Mind Brain Behavior Institute, Columbia University, New York, NY 10027, USA
| | - Eliezyer Fermino de Oliveira
- New York University Neuroscience Institute, New York University, New York, NY 10016, USA.,Center for Mathematics, Computing and Cognition, Universidade Federal do ABC, São Bernardo do Campo, São Paulo, Brazil
| | - Florbela Rocha-Almeida
- New York University Neuroscience Institute, New York University, New York, NY 10016, USA.,Division of Neurosciences, University Pablo de Olavide, 41013 Seville, Spain
| | - David Tingley
- New York University Neuroscience Institute, New York University, New York, NY 10016, USA
| | - György Buzsáki
- New York University Neuroscience Institute, New York University, New York, NY 10016, USA. .,Center for Neural Science, New York University, New York, NY 10016, USA
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9
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Tingley D, Buzsáki G. Routing of Hippocampal Ripples to Subcortical Structures via the Lateral Septum. Neuron 2020; 105:138-149.e5. [PMID: 31784288 PMCID: PMC6952543 DOI: 10.1016/j.neuron.2019.10.012] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Revised: 08/06/2019] [Accepted: 10/03/2019] [Indexed: 01/10/2023]
Abstract
The mnemonic functions of hippocampal sharp wave ripples (SPW-Rs) have been studied extensively. Because hippocampal outputs affect not only cortical but also subcortical targets, we examined the impact of SPW-Rs on the firing patterns of lateral septal (LS) neurons in behaving rats. A large fraction of SPW-Rs were temporally locked to high-frequency oscillations (HFOs) (120-180 Hz) in LS, with strongest coupling during non-rapid eye movement (NREM) sleep, followed by waking immobility. However, coherence and spike-local field potential (LFP) coupling between the two structures were low, suggesting that HFOs are generated locally within the LS GABAergic population. This hypothesis was supported by optogenetic induction of HFOs in LS. Spiking of LS neurons was largely independent of the sequential order of spiking in SPW-Rs but instead correlated with the magnitude of excitatory synchrony of the hippocampal output. Thus, LS is strongly activated by SPW-Rs and may convey hippocampal population events to its hypothalamic and brainstem targets.
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Affiliation(s)
- David Tingley
- Neuroscience Institute, New York University, New York, NY 10016, USA
| | - György Buzsáki
- Neuroscience Institute, New York University, New York, NY 10016, USA; Department of Neurology, Langone Medical Center, New York University, New York, NY 10016, USA; Center for Neural Science, New York University, New York, NY 10003, USA.
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10
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Lampshire Z, Tingley D, Jarvis A, Wernham C, Hughes JC, Welsh TJ. Fracture risk is under-recognised and under-treated in memory clinic attendees. Maturitas 2019; 123:37-39. [PMID: 31027675 DOI: 10.1016/j.maturitas.2019.02.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2019] [Revised: 02/08/2019] [Accepted: 02/11/2019] [Indexed: 12/21/2022]
Abstract
UK national guidelines recommend that older people at risk of falling should have their fracture risk assessed and acted upon. People with cognitive impairment are more likely to sustain a fracture than their cognitively intact peers. We assessed the fracture risk of 79 memory clinic attendees and compared their actual management with guidelines. Despite reporting 57 falls in the last year, only 36% of those who would be recommended antiresportive treatment were prescribed it and a dual-energy X-ray absorptiometry (DEXA)scan was performed in only 13% where it would be recommended. These findings highlight an important deficit in fracture risk assessment which should inform future interventions.
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Affiliation(s)
- Z Lampshire
- Research Institute for the Care of Older People, Bath, United Kingdom; Cardiff University Brain Research Imaging Centre, School of Psychology, Cardiff University, Cardiff, United Kingdom
| | - D Tingley
- Research Institute for the Care of Older People, Bath, United Kingdom
| | - A Jarvis
- Research Institute for the Care of Older People, Bath, United Kingdom
| | - C Wernham
- Research Institute for the Care of Older People, Bath, United Kingdom
| | - J C Hughes
- Research Institute for the Care of Older People, Bath, United Kingdom; Royal United Hospitals Bath NHS Foundation Trust, Bath, United Kingdom; University of Bristol, Bristol, United Kingdom
| | - T J Welsh
- Research Institute for the Care of Older People, Bath, United Kingdom; Royal United Hospitals Bath NHS Foundation Trust, Bath, United Kingdom; University of Bristol, Bristol, United Kingdom.
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11
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Abstract
Neural computations are often compared to instrument-measured distance or duration, and such relationships are interpreted by a human observer. However, neural circuits do not depend on human-made instruments but perform computations relative to an internally defined rate-of-change. While neuronal correlations with external measures, such as distance or duration, can be observed in spike rates or other measures of neuronal activity, what matters for the brain is how such activity patterns are utilized by downstream neural observers. We suggest that hippocampal operations can be described by the sequential activity of neuronal assemblies and their internally defined rate of change without resorting to the concept of space or time.
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Affiliation(s)
- György Buzsáki
- Neuroscience Institute, 435 East 30th Street, Langone Medical Center, New York University, New York, NY 10016, USA; Department of Neurology, Langone Medical Center, New York University, New York, NY 10016, USA; Center for Neural Science, New York University, New York, NY 10003, USA.
| | - David Tingley
- Neuroscience Institute, 435 East 30th Street, Langone Medical Center, New York University, New York, NY 10016, USA
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12
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Alexander AS, Rangel LM, Tingley D, Nitz DA. Neurophysiological signatures of temporal coordination between retrosplenial cortex and the hippocampal formation. Behav Neurosci 2018; 132:453-468. [PMID: 30070554 DOI: 10.1037/bne0000254] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Retrosplenial cortex (RSC) is heavily interconnected with a multitude of cortical regions and is directly connected with the hippocampal formation. As such, it is a likely coordinator of information transfer between the hippocampus (HPC) and cortex in the service of spatial cognition and episodic memory. The current work examined three potential temporal frameworks for retrosplenial-hippocampal communication, namely, theta frequency oscillations (6-12 Hz), sharp-wave/ripple events, and repeating, theta phase-locked shifts from low (30-65 Hz) to high (120-160 Hz) gamma frequency oscillations. From simultaneous recordings of single units and local field potentials (LFPs) in RSC and HPC, we report the presence of prominent theta, low-gamma, and high-gamma oscillations in the retrosplenial LFP. Retrosplenial and hippocampal theta rhythms were strongly coherent and subgroups of retrosplenial neurons exhibited either spiking at theta frequencies and/or spike-phase-locking to theta. Retrosplenial neurons were also phase-locked to local low- and high-gamma rhythms, and power in these frequency bands was coupled in a sequential fashion to specific phases of hippocampal and retrosplenial theta rhythms. Coordinated activity between the two regions also occurred during hippocampal sharp-wave/ripple events, where retrosplenial neuron populations were modulated in their spiking and retrosplenial LFPs exhibited sharp-wave-like events that co-occurred with those observed in HPC. These results identify several temporal windows of synchronization between RSC and HPC that may mediate cortico-hippocampal processes related to learning, memory, and spatial representation. (PsycINFO Database Record (c) 2018 APA, all rights reserved).
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13
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Tingley D, Alexander AS, Quinn LK, Chiba AA, Nitz D. Multiplexed oscillations and phase rate coding in the basal forebrain. Sci Adv 2018; 4:eaar3230. [PMID: 30083600 PMCID: PMC6070333 DOI: 10.1126/sciadv.aar3230] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Accepted: 06/19/2018] [Indexed: 05/30/2023]
Abstract
Complex behaviors demand temporal coordination among functionally distinct brain regions. The basal forebrain's afferent and efferent structure suggests a capacity for mediating this coordination at a large scale. During performance of a spatial orientation task, synaptic activity in this region was dominated by four amplitude-independent oscillations temporally organized by the phase of the slowest, a theta-frequency rhythm. Oscillation amplitudes were also organized by task epoch and positively correlated to the task-related modulation of individual neuron firing rates. For many neurons, spiking was temporally organized through phase precession against theta band field potential oscillations. Theta phase precession advanced in parallel to task progression, rather than absolute spatial location or time. Together, the findings reveal a process by which associative brain regions can integrate independent oscillatory inputs and transform them into sequence-specific, rate-coded outputs that are adaptive to the pace with which organisms interact with their environment.
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Affiliation(s)
- David Tingley
- New York University (NYU) Neuroscience Institute, School of Medicine, NYU, New York, NY 10016, USA
- Department of Cognitive Science, University of California, San Diego, San Diego, CA 92093–0515, USA
| | - Andrew S. Alexander
- Department of Cognitive Science, University of California, San Diego, San Diego, CA 92093–0515, USA
- Department of Psychological and Brain Science, Boston University, Boston, MA 02215, USA
| | - Laleh K. Quinn
- Department of Cognitive Science, University of California, San Diego, San Diego, CA 92093–0515, USA
| | - Andrea A. Chiba
- Department of Cognitive Science, University of California, San Diego, San Diego, CA 92093–0515, USA
| | - Douglas Nitz
- Department of Cognitive Science, University of California, San Diego, San Diego, CA 92093–0515, USA
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14
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Tingley D, Buzsáki G. Transformation of a Spatial Map across the Hippocampal-Lateral Septal Circuit. Neuron 2018; 98:1229-1242.e5. [PMID: 29779942 DOI: 10.1016/j.neuron.2018.04.028] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2018] [Revised: 03/20/2018] [Accepted: 04/19/2018] [Indexed: 01/08/2023]
Abstract
The hippocampus constructs a map of the environment. How this "cognitive map" is utilized by other brain regions to guide behavior remains unexplored. To examine how neuronal firing patterns in the hippocampus are transmitted and transformed, we recorded neurons in its principal subcortical target, the lateral septum (LS). We observed that LS neurons carry reliable spatial information in the phase of action potentials, relative to hippocampal theta oscillations, while the firing rates of LS neurons remained uninformative. Furthermore, this spatial phase code had an anatomical microstructure within the LS and was bound to the hippocampal spatial code by synchronous gamma frequency cell assemblies. Using a data-driven model, we show that rate-independent spatial tuning arises through the dynamic weighting of CA1 and CA3 cell assemblies. Our findings demonstrate that transformation of the hippocampal spatial map depends on higher-order theta-dependent neuronal sequences. VIDEO ABSTRACT.
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Affiliation(s)
- David Tingley
- Neuroscience Institute, New York University, New York, NY 10016, USA
| | - György Buzsáki
- Neuroscience Institute, New York University, New York, NY 10016, USA; Department of Neurology, New York University, New York, NY 10016, USA; Langone Medical Center, New York University, New York, NY 10016, USA; Center for Neural Science, New York University, New York, NY 10003, USA.
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Tingley D, Alexander AS, Kolbu S, de Sa VR, Chiba AA, Nitz DA. Task-phase-specific dynamics of basal forebrain neuronal ensembles. Front Syst Neurosci 2014; 8:174. [PMID: 25309352 PMCID: PMC4173808 DOI: 10.3389/fnsys.2014.00174] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2014] [Accepted: 09/01/2014] [Indexed: 02/01/2023] Open
Abstract
Cortically projecting basal forebrain neurons play a critical role in learning and attention, and their degeneration accompanies age-related impairments in cognition. Despite the impressive anatomical and cell-type complexity of this system, currently available data suggest that basal forebrain neurons lack complexity in their response fields, with activity primarily reflecting only macro-level brain states such as sleep and wake, onset of relevant stimuli and/or reward obtainment. The current study examined the spiking activity of basal forebrain neuron populations across multiple phases of a selective attention task, addressing, in particular, the issue of complexity in ensemble firing patterns across time. Clustering techniques applied to the full population revealed a large number of distinct categories of task-phase-specific activity patterns. Unique population firing-rate vectors defined each task phase and most categories of task-phase-specific firing had counterparts with opposing firing patterns. An analogous set of task-phase-specific firing patterns was also observed in a population of posterior parietal cortex neurons. Thus, consistent with the known anatomical complexity, basal forebrain population dynamics are capable of differentially modulating their cortical targets according to the unique sets of environmental stimuli, motor requirements, and cognitive processes associated with different task phases.
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Affiliation(s)
- David Tingley
- Department of Cognitive Science, University of California, San Diego San Diego, CA, USA
| | - Andrew S Alexander
- Department of Cognitive Science, University of California, San Diego San Diego, CA, USA
| | - Sean Kolbu
- Department of Cognitive Science, University of California, San Diego San Diego, CA, USA
| | - Virginia R de Sa
- Department of Cognitive Science, University of California, San Diego San Diego, CA, USA
| | - Andrea A Chiba
- Department of Cognitive Science, University of California, San Diego San Diego, CA, USA
| | - Douglas A Nitz
- Department of Cognitive Science, University of California, San Diego San Diego, CA, USA
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Chappell P, Bachinsky M, Seymour P, Siuciak J, Tingley D, Schmidt C, McLean S. NK-1 receptor antagonists: a review of preclinical and clinical data. Eur Psychiatry 2002. [DOI: 10.1016/s0924-9338(02)80045-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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Davies C, Tingley D, Kachar B, Wenthold RJ, Petralia RS. Distribution of members of the PSD-95 family of MAGUK proteins at the synaptic region of inner and outer hair cells of the guinea pig cochlea. Synapse 2001; 40:258-68. [PMID: 11309841 DOI: 10.1002/syn.1048] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
PDZ-domain containing proteins of the MAGUK (membrane-associated guanylate kinase) family target, anchor, and cluster receptors and channels to subcellular sites. Among the MAGUK proteins, the members of the PSD-95 family (MAGUKs: PSD-95, PSD-93, SAP-97, and SAP-102) target and anchor glutamate receptors to the synaptic terminals. Associations of glutamate receptors with MAGUKs have been described in the brain but not in the cochlea. In this study, RT-PCR, immunofluorescence microscopy, and immunoelectron microscopy were used to investigate the presence and distribution of MAGUK proteins in the organ of Corti. The presence of the mRNA for PSD-95, PSD-93, SAP-97, and SAP-102 in the organ of Corti was confirmed by RT-PCR. Immunocytochemistry using a "pan-MAGUK" antibody, which recognizes all four MAGUK proteins, and selective antibodies against these proteins revealed that all four MAGUKs are present within the base of inner hair cells while all except SAP-97 are found within the base of the outer hair cells. In addition, PSD-93 and PSD-95 are found in postsynaptic afferent terminals on inner hair cells, while postsynaptic afferent terminals on outer hair cells have PSD-93.
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MESH Headings
- Animals
- Guanylate Kinases
- Guinea Pigs
- Hair Cells, Auditory, Inner/chemistry
- Hair Cells, Auditory, Inner/ultrastructure
- Hair Cells, Auditory, Outer/chemistry
- Hair Cells, Auditory, Outer/ultrastructure
- Immunohistochemistry
- Microscopy, Immunoelectron
- Nerve Tissue Proteins/analysis
- Neuropeptides/analysis
- Nucleoside-Phosphate Kinase/analysis
- Potassium Channels/metabolism
- Receptors, Glutamate/metabolism
- Spiral Ganglion/chemistry
- Spiral Ganglion/ultrastructure
- Synaptic Membranes/chemistry
- Synaptic Membranes/ultrastructure
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Affiliation(s)
- C Davies
- Section on Structural Cell Biology, NIDCD, NIH, Bethesda, Maryland, USA
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