Franke, H., Krugel, U., Illes, P. P2 receptor-mediated proliferative effects on astrocytes in vivo. Glia, 28(3) (1999), 190-200

Kittner, H., Krugel, U., Poelchen, W., Sieler, D., Reinhardt, R., Illes, P. P2 receptor-mediated activation of noradrenergic and dopaminergic neurons in the rat brain. Prog. Brain Res. 120 (1999), 223-235

Franke, H., Krugel, U., Illes, P. P2Y- and P2X-Receptor mediated effects on astrocytes in vivo. Br. J. Pharmacol. Vol. 128 Suppl. (1999) 153

Krugel, U., Kittner, H., Illes, P. Adenosine 5‘-triphosphate-induced dopamine release in the rat nucleus accumbens in vivo. Neurosci. Lett. 265 (1999) 49-52

Krugel, U., Kittner, H., Illes, P. Studies on the relationships between extracellular dopamine in the rat nucleus accumbens and quantitative EEG. Br. J. Pharmacol. Vol. 128 Suppl. (1999) 173

Kittner, H., Krugel, U., Hoffmann, E., Illes, P. Effects of intra-accumbens injection of 2-methylthio ATP: a combined open field and electroencephalographic study in rats. Psycopharmalcol. 150 (2000) 123-131

Kittner, H., Krugel, U., El-Ashmawy, I.M., Illes, P. Suppression of feeding-evoked dopamine release in the rat nucleus accumbens by blockade of P2 receptors. Eur. J. Pharmacol. 406 (2000) R13-14

Krugel, U., Kittner, H., Illes, P. Mechanisms of adenosine 5’-phosphate-induced dopamine release in the nucleus accumbens in vivo. Synapse 39 (3) (2001) 222-232

Kittner, H., Krugel, U., Illes P. The purinergic P2 receptor antagonist pyridoxalphosphate-6-azophenyl-2’,4’-disulphonic acid prevents both the acute locomotor effects of amphetamine and the behavioural sensitisation caused by repeated amphetamine injections in rat. Neuroscience (2001) 102, 241-243

Krugel, U., Kittner, H., Franke, H., Illes, P. Stimulation of P2 receptors in the ventral tegmental area enhances dopaminergic mechanisms in vivo. Neuropharmacology (2001), 40(8) 1083-1092

Krugel, U., Bigl, V., Eschrich, K., Bigl, M. Deafferentation of the septohippocampal pathway in rat as a modell of the metabolic events in Alzheimers Disease. Intern. J. Develop. Neurosci. 19(3) (2001) 263-277

Krugel, U., Kittner, H., Franke ,H., Illes, P. Accelerated functional recovery after neuronal injury by P2 receptor blockade. Eur. J. Pharmacol. (2001), 420/2-3, R3-R5

Franke, H., Bringmann, A., Pannicke., T, Krugel, U., Grosche, J., Reichenbach, A., Illes, P. P2 receptors on macroglial cells: functional implication for gliosis. Drug Devel. Res. (2001) 53, 140-147

Franke, H., Krugel, U., Schmidt, R., Grosche, J., Reichenbach, A., Illes, P. P2 receptor-types involved in astrogliosis in vivo. Brit. J. Pharmacol. (2001), 134 (6), 1180-1189

Franke, H., Grosche, J., Schädlich, Krugel, U., Allgeier, C., Illes, P. P2X receptor expression on astrocytes in the nucleus accumbens of rats. Neurosci. (2001), 108 , 421-429

Kittner H., Franke H., Fischer W., Schultheis, N., Krugel, U., Illes, P. Stimulation of P2Y(1) Receptors Causes Anxiolytic-like Effects in the Rat Elevated Plus-maze: Implications for the Involvement of P2Y(1) Receptor-Mediated Nitric Oxide Production. Neuropsychopharmacology 2003 Mar;28(3):435-444

Krugel, U., Kittner, H., Fanke, H., Illes, P. Purinergic modulation of neuronal activity in the mesolimbic dopaminergic system in vivo. Synapse 47:134-142 (2003)

Franke, H., Krugel, U.,  Grosche, J., Illes, P. Immunoreactivity for glial fibrillary acidic protein and P2 receptor expression on astrocytes in vivo. Drug Devel. Res. 59: 175-189 (2003)

Krugel, U., Seidel, B., Spies, O., Kittner, H., Illes, P., Kiess, W. Chronic food restriction alters purinergic receptor mRNA expression in the nucleus accumbens of the rat. Drug Devel. Res. 59(1) 95-103 (2003)

Krugel, U., Schraft, T., Kittner, H., Kiess, W., Illes, P. Basal and feeding-evoked dopamine release in the rat nucleus accumbens is depressed by leptin. Eur. J. Pharmacol 482 (1-3) 185-187, 2003

Kittner, H., Krugel, U., Hoffmann, E., Illes, P. Modulation of feeding behaviour by blocking of purinergic receptors in the rat nucleus accumbens: a combined microdialysis, electroencephalographic and behavioural study. Eur J Neurosci. 19(2), 396-404, 2004

Kittner, H., Hoffmann, E., Krugel, U., Illes, P. P2 receptor-mediated effects on the open field behaviour of rats in comparison with behavioural responses induced by the stimulation of dopamine D₂-like and by the blockade of ionotrophic glutamate receptors. Behav. Brain Res., 149(2) 197-208, 2004

Krugel, U. Schraft, T., Regenthal, R., Illes, P., Kittner, H. Purinergic modulation of extracellular glutamate levels in the nucleus accumbens in vivo. Intern J. Dev. Neurosci. 22/7,565-570, 2004

Franke, H, Krugel, U., Grosche, J., Heine, C., Härtig,W:, Allgaier, C., Illes, P. P2Y receptor expression on astrocytes in the nucleus accumbens of rats. Neuroscience, 127(2):431-41, 2004

K. Eger, M. Hermes, K. Uhlemann, S. Rodewald, J. Ortwein, M. Brulport, A.W. Bauer, W. Schormann, F. Lupatsch, I.B. Schiffer, C.K. Heimerdinger, S. Gebhard, C. Spangenberg, D. Prawitt, T. Trost, B. Zabel, C. Sauer, B. Tanner, H. Kolbl, U. Krugel, H. Franke, P. Illes, P. Madaj-Sterba, E.O. Bockamp, T. Beckers, J.G. Hengstler, 4-Epidoxycycline: an alternative to doxycycline to control gene expression in conditional mouse models, Biochem. Biophys. Res. Comm. 323 (2004) 979–986

Krugel, U., Spies, O., Regenthal, R., Illes, I., Kittner, H:. P2 receptors are involved in the mediation of motivation-related behavior. Purinergic Signalling 1 (in press), 2004