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Vol. 65, No. 3, 1997
Issue release date: 1997
Neuroendocrinology 1997;65:210–215

Central and Peripheral Administration of Atriopeptin Is Anxiolytic in Rats

Ströhle A. · Jahn H. · Montkowski A. · Liebsch G. · Boll E. · Landgraf R. · Holsboer F. · Wiedemann K.
Max Planck Institute of Psychiatry, Clinical Institute, Munich, Germany

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The effects of the central and peripheral administration of atriopeptin II, a 23-amino acid residue peptide of atrial natriuretic peptide (Ser103-Arg125) on anxiety-related behavior and on locomotor activity, was studied in male Wis-tar rats. Their behavior on the elevated plus-maze after social defeat stress indicated that intracerebroventricular (2.5 and 5 µg) and intraperitoneal (50 µg) administration of atriopeptin II produced anxiolysis. A low dose of 0.25 µg atriopeptin II administered bilaterally into the central nucleus of the amygdala was also found to be anxiolytic. Because intracerebroventricular administration of 5 µg atriopeptin II did not affect locomotor activity in the open-field test, the possibility that the anxiolytic effect was secondary to sedation could be ruled out. The anxiolytic effects observed after central and peripheral administration support the idea that atrial natriuretic peptide, which is increased in panic-anxiety, may be involved in the tapering of anxiety-related behavior.

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