title: Photostimulation of whole-cell conductance in primary rat neocortical astrocytes mediated by organic semiconducting thin films.
abstract: Astroglial ion channels are fundamental molecular targets in the study of brain physiology and pathophysiology. Novel tools and devices intended for stimulation and control of astrocytes ion channel activity are therefore highly desirable. The study of the interactions between astrocytes and biomaterials is also essential to control and minimize reactive astrogliosis, in view of the development of implantable functional devices. Here, the growth of rat primary neocortical astrocytes on the top of a light sensitive, organic polymer film is reported; by means of patch-clamp analyses, the effect of the visible light stimulation on membrane conductance is then determined. Photoexcitation of the active material causes a significant depolarization of the astroglial resting membrane potential: the effect is associated to an increase in whole-cell conductance at negative potentials. The magnitude of the evoked inward current density is proportional to the illumination intensity. Biophysical and pharmacological characterization suggests that the ion channel mediating the photo-transduction mechanism is a chloride channel, the ClC-2 channel. These results open interesting perspectives for the selective manipulation of astrocyte bioelectrical activity by non-invasive, label-free, organic-based, photostimulation approaches.
authors: Consiglio Nazionale delle Ricerche (CNR), Istituto per la Sintesi Organica e la Fotoreattività (ISOF), Via Gobetti 101, 40129, Bologna, Italy.
authors: Valentina
authors: V
authors: Benfenati
authors: Nicola
authors: N
authors: Martino
authors: Maria Rosa
authors: MR
authors: Antognazza
authors: Assunta
authors: A
authors: Pistone
authors: Stefano
authors: S
authors: Toffanin
authors: Stefano
authors: S
authors: Ferroni
authors: Guglielmo
authors: G
authors: Lanzani
authors: Michele
authors: M
authors: Muccini
mesh_terms: D000818:Animals; D001253:Astrocytes / Q000528:radiation effects*; D000090007:CLC-2 Chloride Channels; D002470:Cell Survival / Q000528:radiation effects; D002478:Cells, Cultured; D018118:Chloride Channels / Q000378:metabolism; D008027:Light; D008564:Membrane Potentials / Q000528:radiation effects; D019579:Neocortex / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D051381:Rats
chemical_list: D000090007:CLC-2 Chloride Channels; D018118:Chloride Channels; D011108:Polymers
keywords: astrocytes; cell photostimulation; chloride ion channels; organic bioelectronics; organic semiconducting polymers