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X-ORIGINAL-URL:https://ibecbarcelona.eu
X-WR-CALDESC:Events for Institute for Bioengineering of Catalonia
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DTSTART:20140101T000000
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BEGIN:VEVENT
DTSTART;TZID=UTC:20151119T120000
DTEND;TZID=UTC:20151119T130000
DTSTAMP:20260416T192157
CREATED:20151109T154810Z
LAST-MODIFIED:20151109T154810Z
UID:95878-1447934400-1447938000@ibecbarcelona.eu
SUMMARY:IBEC Seminar: Luis de Lecea
DESCRIPTION:Optogenetic control of arousal\nLuis de Lecea\, Department of Psychiatry and Behavioral Sciences\, Stanford University School of Medicine\nChanges in arousal states are at the core of most neuropsychiatric disorders. Several groups of monoaminergic neurons have long been known to facilitate arousal state transitions. Here we will review the role of hypocretin/orexin neurons in the dynamics of sleep-to-wake transitions. I will also show data demonstrating that dopaminergic neurons of the ventral tegmental area (VTA) directly and causally control the generation and maintenance of electrocortical and behavioral arousal. Combining chemogenetic and optogenetic tools with polysomnographic recordings in mice\, we show that activity in VTA-dopaminergic neurons is necessary for arousal\, and that their chemogenetic inhibition suppresses wakefulness to promote both non-rapid eye movement (NREM) and REM sleep. Moreover\, chemogenetic inhibition of VTA-dopaminergic neurons suppresses wakefulness even in the face of highly salient stimuli related to reproduction\, feeding and predation. Nevertheless\, prior to inducing sleep\, chemogenetic inhibition of VTA-dopaminergic neurons promotes goal-directed and sleep-related nest building behavior. Optogenetic stimulation\, in contrast\, initiates and maintains long-term wakefulness and suppresses sleep and sleep-related nesting behavior. We further show that the nucleus accumbens (NAc) circuit\, and not the medial prefrontal cortex (mPFC)\, mediates most of VTA-dopaminergic effects on arousal. After collecting data from multiple brain structures involved in arousal states\, we propose a computational model that assigns probabilities to optogenetically-induced arousal state transitions in individual brain structures. We identify feedback\, redundancy\, and gating hierarchy as three fundamental aspects of this model. Incorporation of conductance-based models of neuronal ensembles into this model and existing models of cortical excitability will provide more comprehensive insight into arousal state dynamics as well as arousal-related disorders.
URL:https://ibecbarcelona.eu/event/ibec-seminar-luis-de-lecea-2/
CATEGORIES:IBEC Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20151119T120000
DTEND;TZID=UTC:20151119T130000
DTSTAMP:20260416T192157
CREATED:20151109T154810Z
LAST-MODIFIED:20151113T074152Z
UID:19587-1447934400-1447938000@ibecbarcelona.eu
SUMMARY:IBEC Seminar: Luis de Lecea
DESCRIPTION:Optogenetic control of arousal\nLuis de Lecea\, Department of Psychiatry and Behavioral Sciences\, Stanford University School of Medicine\nChanges in arousal states are at the core of most neuropsychiatric disorders. Several groups of monoaminergic neurons have long been known to facilitate arousal state transitions. Here we will review the role of hypocretin/orexin neurons in the dynamics of sleep-to-wake transitions. I will also show data demonstrating that dopaminergic neurons of the ventral tegmental area (VTA) directly and causally control the generation and maintenance of electrocortical and behavioral arousal. Combining chemogenetic and optogenetic tools with polysomnographic recordings in mice\, we show that activity in VTA-dopaminergic neurons is necessary for arousal\, and that their chemogenetic inhibition suppresses wakefulness to promote both non-rapid eye movement (NREM) and REM sleep. Moreover\, chemogenetic inhibition of VTA-dopaminergic neurons suppresses wakefulness even in the face of highly salient stimuli related to reproduction\, feeding and predation. Nevertheless\, prior to inducing sleep\, chemogenetic inhibition of VTA-dopaminergic neurons promotes goal-directed and sleep-related nest building behavior. Optogenetic stimulation\, in contrast\, initiates and maintains long-term wakefulness and suppresses sleep and sleep-related nesting behavior. We further show that the nucleus accumbens (NAc) circuit\, and not the medial prefrontal cortex (mPFC)\, mediates most of VTA-dopaminergic effects on arousal. After collecting data from multiple brain structures involved in arousal states\, we propose a computational model that assigns probabilities to optogenetically-induced arousal state transitions in individual brain structures. We identify feedback\, redundancy\, and gating hierarchy as three fundamental aspects of this model. Incorporation of conductance-based models of neuronal ensembles into this model and existing models of cortical excitability will provide more comprehensive insight into arousal state dynamics as well as arousal-related disorders.
URL:https://ibecbarcelona.eu/event/ibec-seminar-luis-de-lecea/
CATEGORIES:IBEC Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20151127T120000
DTEND;TZID=UTC:20151127T130000
DTSTAMP:20260416T192157
CREATED:20151106T080207Z
LAST-MODIFIED:20151123T092950Z
UID:19561-1448625600-1448629200@ibecbarcelona.eu
SUMMARY:IBEC Seminar: Chia-Fu Chou
DESCRIPTION:Low-copy number biomolecular analysis with dielectrophoretic enrichment /trapping via molecular dam and plasmonic electrode nanogaps\nChia-Fu Chou\, Senior Research Fellow/Professor\, Institute of Physics\, Academia Sinica\, Taiwan\nNanoscale structures\, such as electrode nanogap and nanofluidic confinement\, given its simplicity in geometry\, nevertheless offer unique platforms for the study of molecular and cellular biophysics\, with the potential for bioanalytical applications [1-5]. For low-copy number molecule detection\, we developed two versatile analysis platforms for the manipulation and sensing of biomolecules. In the first scenario\, sub-30 nm insulating nanoconstriction operating under the balance of negative dielectrophoresis (DEP)\, electrophoresis\, and electroosmosis\, serves as molecular dam\, enables protein enrichment of 105-fold in 20 seconds [6]\, which can then be coupled with graphene-modified electrode for sensitive electrochemical detection of proteins and peptides [7\, 8]. In the second scenario\, an array of Ti/Au electrode nanogaps with sub-10 nm gap size function as templates for AC DEP-based molecular trapping\, plasmonic hot spots for surface-enhanced Raman spectroscopy as well as electronic measurements\, and fluorescence imaging. During molecular trapping\, recorded Raman spectra\, conductance measurements across the nanogaps and fluorescence imaging show unambiguously the presence and characteristics of the trapped molecules\, demonstrated with R-phycoerythrin [9] and Alzheimer’s disease associated biomarkers A-beta 40 and 42 peptides. Our platforms open up simple ways for multifunctional low-concentration heterogeneous sample analysis.\n[1] L.J. Guo\, X. Cheng\, C.F. Chou\, Nano Lett. 4\, 69 (2004).\n[2] J. Gu\, R. Gupta\, C.F. Chou\, Q. Wei\, F. Zenhausern\, Lab Chip 7\, 1198 (2007).\n[3] J.W. Yeh\, A. Taloni\, Y.L. Chen\, C.F. Chou\, Nano Lett. 12\, 1597 (2012). [Research Highlights\, Nature 482\, 442 (2012)].\n[4] J.P. Shen and C.F. Chou\, Biomicrofluidics 8\, 041103 (2014).\n[5] K.K. Sriram\, J.W. Yeh\, Y.L. Lin\, Y.R. Chang\, C.F. Chou\, Nucleic Acids Res. 42\, e85 (2014).\n[6] K.T. Liao\, C.F. Chou\, J. Am. Chem. Soc. 134\, 8742 (2012). [JACS Spotlights: JACS 134\, 10307 (2012)]\n[7] B. Sanghavi\, W. Varhue\, J. Chávez\, C.F. Chou\, N. S. Swami\, Anal. Chem. 86\, 4120 (2014\,).\n[8] B.J. Sanghavi\, W. Varhue\, A. Rohani\, K.T. Liao\, L. Bazydlo\, C.F. Chou\, N. S. Swami\, Lab Chip 2015\, DOI: 10.1039/c5lc00840a.\n[9] L. Lesser-Rojas\, P. Ebbinghaus\, G. Vasan\, M.L. Chu\, A. Erbe\, C.F. Chou\, Nano Lett. 14\, 2242 (2014).
URL:https://ibecbarcelona.eu/event/ibec-seminar-chia-fu-chou/
CATEGORIES:IBEC Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20151127T120000
DTEND;TZID=UTC:20151127T130000
DTSTAMP:20260416T192157
CREATED:20151106T080207Z
LAST-MODIFIED:20151106T080207Z
UID:95877-1448625600-1448629200@ibecbarcelona.eu
SUMMARY:IBEC Seminar: Chia-Fu Chou
DESCRIPTION:Low-copy number biomolecular analysis with dielectrophoretic enrichment /trapping via molecular dam and plasmonic electrode nanogaps\nChia-Fu Chou\, Senior Research Fellow/Professor\, Institute of Physics\, Academia Sinica\, Taiwan\nNanoscale structures\, such as electrode nanogap and nanofluidic confinement\, given its simplicity in geometry\, nevertheless offer unique platforms for the study of molecular and cellular biophysics\, with the potential for bioanalytical applications [1-5]. For low-copy number molecule detection\, we developed two versatile analysis platforms for the manipulation and sensing of biomolecules. In the first scenario\, sub-30 nm insulating nanoconstriction operating under the balance of negative dielectrophoresis (DEP)\, electrophoresis\, and electroosmosis\, serves as molecular dam\, enables protein enrichment of 105-fold in 20 seconds [6]\, which can then be coupled with graphene-modified electrode for sensitive electrochemical detection of proteins and peptides [7\, 8]. In the second scenario\, an array of Ti/Au electrode nanogaps with sub-10 nm gap size function as templates for AC DEP-based molecular trapping\, plasmonic hot spots for surface-enhanced Raman spectroscopy as well as electronic measurements\, and fluorescence imaging. During molecular trapping\, recorded Raman spectra\, conductance measurements across the nanogaps and fluorescence imaging show unambiguously the presence and characteristics of the trapped molecules\, demonstrated with R-phycoerythrin [9] and Alzheimer’s disease associated biomarkers A-beta 40 and 42 peptides. Our platforms open up simple ways for multifunctional low-concentration heterogeneous sample analysis.\n[1] L.J. Guo\, X. Cheng\, C.F. Chou\, Nano Lett. 4\, 69 (2004).\n[2] J. Gu\, R. Gupta\, C.F. Chou\, Q. Wei\, F. Zenhausern\, Lab Chip 7\, 1198 (2007).\n[3] J.W. Yeh\, A. Taloni\, Y.L. Chen\, C.F. Chou\, Nano Lett. 12\, 1597 (2012). [Research Highlights\, Nature 482\, 442 (2012)].\n[4] J.P. Shen and C.F. Chou\, Biomicrofluidics 8\, 041103 (2014).\n[5] K.K. Sriram\, J.W. Yeh\, Y.L. Lin\, Y.R. Chang\, C.F. Chou\, Nucleic Acids Res. 42\, e85 (2014).\n[6] K.T. Liao\, C.F. Chou\, J. Am. Chem. Soc. 134\, 8742 (2012). [JACS Spotlights: JACS 134\, 10307 (2012)]\n[7] B. Sanghavi\, W. Varhue\, J. Chávez\, C.F. Chou\, N. S. Swami\, Anal. Chem. 86\, 4120 (2014\,).\n[8] B.J. Sanghavi\, W. Varhue\, A. Rohani\, K.T. Liao\, L. Bazydlo\, C.F. Chou\, N. S. Swami\, Lab Chip 2015\, DOI: 10.1039/c5lc00840a.\n[9] L. Lesser-Rojas\, P. Ebbinghaus\, G. Vasan\, M.L. Chu\, A. Erbe\, C.F. Chou\, Nano Lett. 14\, 2242 (2014).
URL:https://ibecbarcelona.eu/event/ibec-seminar-chia-fu-chou-2/
CATEGORIES:IBEC Seminar
END:VEVENT
END:VCALENDAR