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Research Group
Physiology of prefrontal cortex. Physiology of the Carotid Body
Unit Unit Cellular and Systems Neurobiology »

Principal Investigator
Research Fields
The work of our group is focused on two lines of research:

1. The study of the basic physiological mechanisms of the cortical local circuits, and in particular of the prefrontal cortex circiuts; this cortical area is implicated in several cognitive functions, including a crucial role in the working memory. Also, prefrontal cortex is densely innervated by dopaminergic and serotoninergic fibres arising in diencephalon and brain stem which participate in the control of cortical functions. We currently use intracellular recordings with microelectrodes and patch electrodes from cortical pyramidal neurons visually identified with infrared differential interference contrast microscopy (IR-DIC) and we measure membrane potential and currents and synaptic responses. The main lines of work are the study of:

a. The intrinsic electrophysiological properties of cortical neurons, the voltage-dependent ionic currents and their modulation by dopamine.
b. The mechanisms of excitatory and inhibitory synaptic transmission at the level of local circuits, their modulation by dopamine and the role of intrinsic electrophysiological properties on the processes of synaptic integration.
c. The electrophysiology of the cerebral cortex of a genetically modified mouse that is a model of a human disease (the mutant mouse of the gene Lis1; the mutations of the LIS1 gene in man produce lissencephaly). This line of research is conducted as a collaboration with Dr. Salvador Martínez, from the Unit of Development of the IN:

2. The physiology of the type I cells of the carotid body; these are quimioreceptor cells and are sensitive to the O2 and CO2 partial pressure and to the blood pH. We use current and membrane potential recordings with patch electrodes from dissociated cells from the carotid body kept in primary cultures. The main lines of work are the study of:

a. The calcium currents present in the cell membrane and their role in the secretion of catecholamines.
b. The effect of natural stimuli and of several metabolic venoms on the electrical responses of these cells.

Representative Publications

De la Peña E , Geijo-Barrientos E. " Laminar localization, morphology, and physiological properties of pyramidal neurons that have the low-threshold calcium current in the guinea-pig medial frontal cortex. " Journal of Neuroscience . 16 nº17 , 5301 - 5311 ( 1996 )

Rigual, R. , Almaraz, L., Gonzalez, C., Donnelly, D. " Developmental changes in chemoreceptor nerve activity and catecholamine secretion in rabbit carotid body: possible role of Na+ and Ca2+currents. " Pflügers Arch. Eur. J. Physiol . 493 , 463 - 470 ( 2000 )

Geijo-Barrientos E. , " Subthreshold inward membrane currents in guinea-pig frontal cortex neurons. " Neuroscience. . 95(4) , 965 - 972 ( 2000 )

de la Peña, E. , Geijo-Barrientos, E. " Participation of low-threshold calcium spikes in excitatory synaptic transmission in guinea pig medial frontal cortex. " Eur J Neurosci. . 12(5) , 1679 - 1686 ( 2000 )

Rocher A. , Geijo E., Cáceres AI., González C. y Almaraz L. " A reevaluation of the mechanisms involved in the secretion of catecholamine evoked by 2,4-dinitro-phenol from chemoreceptor cells of the rabbit carotid body. " Advances in Experimental Biology and Medicine . 536 , 85 - 93 ( 2003 )
Consejo Superior de Investigaciones Científicas
Universidad Miguel Hernández

Campus de San Juan | Sant Joan d’Alacant
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