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6-OHDA bilateral lesions to the central amygdala do not affect vasopressin improvement of recall in rats

100%
Winnicka M. M.
Acta Neurobiologiae Experimentalis
|
1996
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vol. 56
|
issue 4
943-948
EN
The influence of vasopressin (AVP) on recall of information in a passive avoidance situation after bilateral 6-OHDA lesions to the central amygdala was tested. AVP given 15 min before the retention testing at the icv dose of 1 mg signifcantly prolonged avoidance latencies both in lesioned and in sham-operated rats in comparison with the respective icv saline injected animals. Insignificant increase of spontaneous locomotor activity in rats lesioned to the central amygdala was unlikely to interfere with the cognitive effect of AVP. These results suggest that dopaminergic projection to the central amygdala is not responsible for the facilitatory effect of AVP on retrieval process in a passive avoidance situation.
2
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CGP 42112A abolishes facilitation of recognition caused by angiotensin II and angiotensin II(3-7) in rats

51%
Braszko J. J., Kulakowska A., Winnicka M. M., Karwowska-Polecka W.
Acta Neurobiologiae Experimentalis
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1997
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vol. 57
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issue 3
227-234
EN
The role of the angiotensin AT2 receptors in some behavioural effects of angiotensin II (Ang II) and its 3-7 fragment [Ang II(3-7)], using their selective antagonist CGP 42112A, was assessed. Ang II and Ang II(3-7), given intracerebroventricularly (icv) at the dose of 1 nmole each, substantially improved object recognition memory and enhanced apomorphine (1 mg/kg) stereotypy. Pre-treatment of rats with CGP 42112A per se ineffective in all tests, abolished activity of both peptides. None of the treatments significantly changed behaviour of rats in open field. The results point to the considerable involvement of the AT2 angiotensin receptors in the improvement of recognition memory caused by Ang II and Ang II(3-7).
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