Intrinsic Membrane Properties and Inhibitory Synaptic Input of Kenyon Cells as Mechanisms for Sparse Coding?

Institute of Zoology and Physiology, Center for Molecular Medicine Cologne (CMMC), and Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany Submitted 2 March 2009; accepted in final form 18 June 2009 Abstract The insect mushroom bodies (MBs) are multimodal signal processing centers and are essential for olfactory learning. Electrophysiological recordings from the MBs' principal component neurons, the Kenyon cells (KCs), showed a sparse representation of olfactory signals. It has been proposed that the intrinsic and synaptic properties of the KC circuitry combine to reduce the firing of action potentials and to generate relatively brief windows for synaptic integration in the KCs, thus causing them to operate as coincidence detectors. To better understand the ionic mechanisms that mediate the KC intrinsic firing properties, we used whole cell patch-clamp recordings from KCs in the adult, intact brain of Periplaneta americana to analyze voltage- and/or Ca 2+ -dependent inward ( I Ca , I Na ) and outward currents [ I A , I K(V) , I K,ST , I O(Ca) ]. In general the currents had properties similar to those of currents in other insect neurons. Certain functional parameters of I Ca and I O(Ca) , however, had unusually high values, allowing them to assist sparse coding. I Ca had a low-activation threshold and a very high current density compared with those of I Ca in other insect neurons. Together these parameters make I Ca suitable for boosting and sharpening the excitatory postsynaptic potentials as reported in previous studies. I O(Ca) also had a large current density and a very depolarized activation threshold. In combination, the large I Ca and I O(Ca) are likely to mediate the strong spike frequency adaptation. These intrinsic properties of the KCs are likely to be supported by their tonic, inhibitory synaptic input, which was revealed by specific GABA antagonists and which contributes significantly to the hyperpolarized membrane potential at rest. Address for reprint requests and other correspondence: P. Kloppenburg, University of Cologne, Institute of Zoology and Physiology, Weyertal 119, 50931 Cologne, Germany (E-mail: peter.kloppenburg{at}uni-koeln.de )