Effect of N-3-(4-hydroxyphenyl)propionyl Pro-Pro-Gly-Ala-Gly on calcium-induced arrhythmias.

Abstract
The present investigation was done to examine whether or not the presence of hydroxyproline in N-3-(4-hydroxyphenyl) propionyl Pro-Hyp-Gly-Ala-Gly (HP-5) is essential for the antiarrhythmic activity. Pretreatment of mice with 10 mg/kg of [Pro2]-HP-5 provided significantly better protection against calcium-induced arrhythmias than did pretreatment with HP-5. Thus, the prolyl residue was more favorable than the hydroxyprolyl residue for antiarrhythmic activity of these analogues.

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