Abstract

1. 1. The cardiac effects of the N-terminal (1–34) peptide fragment of bovine parathyroid hormone [bPTH-(1–34)] on isolated atria were examined in the frog, Rana tigrina. 2. 2. bPTH-(1–34) produced dose-related inotropic response but no chronotropic response. This inotropic response varied at different times of the year. 3. 3. The inotropic effect of bPTH-(1–34) was attenuated in the presence of verapamil and imidazole. 4. 4. The mechanism of action of bPTH-(1–34) is probably a stimulation of calcium influx directly or indirectly via cAMP production.

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