Differential cardiovascular effects of synthetic peptides derived from endomorphin-1 in anesthetized rats

Peptides
Hong-mei LiuRui Wang

Abstract

Previously, five synthetic peptides derived from endomorphin-1 (Tyr1-Pro2-Trp3-Phe4-NH2, EM-1), including Tyr-D-Ala-Trp-p-Cl-Phe-NH2 (HDAPC), Tyr-D-Ala-Trp-Phe-NH2 (HDADC), Nalpha-amidino-Tyr-D-Ala-Trp-p-Cl-Phe-NH2 (GDAPC), Nalpha-amidino-Tyr-D-Ala-Trp-Phe-NH2 (GDADC) and Nalpha-amidino-Tyr-D-Pro-Gly-Trp-p-Cl-Phe-NH2 (GBDPC), were described to elicit analgesia by subcutaneous administration with enhanced metabolic stabilities. To further our knowledge of the influences of particular modification on the pharmacological activities of EM-1, the present study was undertaken to investigate cardiovascular effects of these peptides in anesthetized rats by intravenous injection. Our results showed that the four D-Ala-containing peptides decreased the systemic arterial pressure (SAP) and heart rate (HR) through a naloxone-sensitive mechanism. Different patterns, potencies and durations of cardiovascular effects were observed among these peptides. When compared to EM-1, the hemodynamic responses to these four tetrapeptides were significantly lower in magnitude but much longer in duration. Surprisingly, intravenous administration of the only pentapeptide GBDPC produced fairly prolonged hypertensive and tachycardiac effects, which was nalo...Continue Reading

References

Jun 26, 1998·Journal of Cardiovascular Pharmacology·A T OmoniyiH H Szeto
Sep 16, 2000·American Journal of Respiratory and Critical Care Medicine·M A CzaplaJ E Zadina

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Citations

Oct 2, 2009·Peptides·Richard J Bodnar
Dec 3, 2014·European Journal of Pharmacology·Xiao-Zhu TianXin-Min Tian
Jan 5, 2012·Expert Opinion on Therapeutic Patents·Lawrence H Lazarus, Yoshio Okada

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