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Effects of localized histamine microinjections into the hippocampal formation on the retrieval of a one-way active avoidance response in rats

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Summary

The possible role of histamine (HA) locally applied into the hippocampus on memory mechanisms of the rats was studied. The acquisition of a one-way active avoidance response to an ultrasonic 40 kHz sinus-wave tone anticipating an electric shock was used as experimental model. Learning sessions consisted in placing animals into a two compartment cage were they learnt to escape to the safe compartment after an ultrasonic tone anticipating an electric feet shock. After acquiring the conditioned avoidance response, animals were implanted with microinjection cannulae and injected with 1 μl of saline, or increasing doses of histamine (9, 22.5, 45, and 90nmol) into the hippocampus. In the experimental sessions, 4 trials before (PRE) and 4 trials afterward treatment (POST), the percentage of conditioned avoidance responses (% CAR) and the latency time to escape (LT) were measured. Results showed that HA increased significantly the LT and this effect was grossly dose-dependent. % CAR was also affected and the score was significantly inhibited by the imidazolamine administration. Results suggest that HA may be involved in memory retrieval processes in the hippocampus.

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Author notes

  1. E. O. Alvarez

    Present address: Laboratorio de Investigaciones Cerebrales, Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Mendoza, Argentina

Authors and Affiliations

  1. Cátedra de Física Biológica, Universidad Nacional de Cuyo, Mendoza, Argentina

    E. O. Alvarez

  2. Laboratorio de Investigaciones Cerebrales, Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Mendoza, Argentina

    A. M. Banzan

Authors
  1. E. O. Alvarez
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  2. A. M. Banzan
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Alvarez, E.O., Banzan, A.M. Effects of localized histamine microinjections into the hippocampal formation on the retrieval of a one-way active avoidance response in rats. J. Neural Transmission 101, 201–211 (1995). https://doi.org/10.1007/BF01271557

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  • DOI: https://doi.org/10.1007/BF01271557

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