Abstract
Neurostimulation employing photoactive organic semiconductors offers an appealing alternative to conventional techniques, enabling targeted action and wireless control through light. In this study, organic electrolytic photocapacitors (OEPC) are employed toinvestigate theeffects oflight-controlled electric stimulation onneuronal networks in vitro and in vivo. The interactions between the devices and biological systems are characterized. Stimulation of primary rat cortical neurons results in anelevated expression of c-Fos within a mature neuronal network. OEPC implantation for three weeks and subsequent stimulation of the somatosensory cortex leads to anincrease of c-Fos in neurons at the stimulation site and in connected brainregions (entorhinal cortex, hippocampus), both intheipsi- andcontralateral hemispheres. Reactivity ofglial andimmune cells after semi-chronic implantation of OEPC in the rat brain is comparable tothatofsurgical controls, indicating minimal foreign body response. Device functionality is further substantiated through retained charging dynamics following explantation. OEPC-based, light-controlled electric stimulation has asignificant impact onneural responsiveness. Theabsence ofdetrimental effects onboth the brain and device encourages further use of OEPC as cortical implants. These findings highlight its potential as anovel mode of neurostimulation and instigate further exploration into applications in fundamental neuroscience.
Published Version
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