Abstract

Introduction: Although aging is the most important risk factor for Alzheimer's disease (AD), there is evidence indicating that neuroinflammation may contribute to the development and progression of the disease. Several studies indicated that minocycline may exert neuroprotective effects in rodent models of neurodegenerative diseases. Nevertheless, there are also other studies implying that minocycline has no positive beneficial effects. Thus, the aim of the present study was to assess the preventive effect of minocycline against A beta-induced changes in intrinsic electrophysiological properties in a rat model of AD. Methods: The present study extended this line of research by examining whether inhibition of microglial activation may alter the intrinsic electrophysiological properties of CA1 pyramidal neurons in a rat model of A beta neurotoxicity, using whole cell patch clamp. Results: Findings showed that bilateral injection of the A beta (1-42) into the prefrontal cortex caused membrane hyperpolarization, action potential (AP) narrowing and after hyperpolarization (AHP) amplitude enhancement. It was also resulted in a faster decay time of AP, higher rheobase current, lower firing frequency and smaller post stimulus AHP amplitude. Administration of minocycline (45mg/kg, i.p) not only failed to prevent A beta-induced alterations in the intrinsic electrophysiological properties, but also enhanced the effects of A beta on neuronal firing behavior. Conclusion: It can be concluded that minocycline, as a microglial inhibitor, may enhance the disruption of electrophysiological properties of CA1 pyramidal neurons induced by A beta neurotoxin, including AP parameters and intrinsic neuronal excitability.