Experimental, Theoretical and Biological Activity of a Triazonine- Derivative on Left Ventricular Pressure

BACKGROUND

There are data indicating that several azonine-derivatives may exert effects on some biological systems; however, there is very low information on the biological activity induced by these compounds on left ventricular pressure.

OBJECTIVE

The aim of this study was to synthesize and evaluate the biological activity of new triazoninederivative on left ventricular pressure.

MATERIAL AND METHODS

The first stage involved: 1) preparation of two azepine-benzamide derivatives (Z or E) by reaction of the nitrobenzoyl azide with adrenosterone; and 2) reaction of (Z)-azepine-benzamide derivative with ethylenediamine to form the triazonine derivative. The structure of compounds was confirmed by spectroscopy and spectrometry data. The second stage involved the biologic activity on left ventricular pressure was evaluated in a model of rat heart isolated. In addition, some physicochemical parameters were evaluated to characterize the possible molecules involved in its effect.

RESULTS

The results showed that only the triazonine increased left ventricular pressure via androgen receptor.

CONCLUSIONS

In conclusion, this phenomenon is conditioned by the functional groups involved in the chemical structure of triazonine derivative and their interaction with residues of amino acids involved on the androgen receptor surface.

Effect of progesterone-carbachol derivative on perfusion pressure and coronary resistance in isolated rat heart: via activation of the M2 muscarinic receptor

AIM

The present study was designed to investigate the effects of progesterone-carbachol derivative on perfusion pressure and coronary resistance in rats. An additional aim was to identify the molecular mechanisms involved.

METHODS

The Langendorff model was used to measure perfusion pressure and coronary resistance changes in isolated rat heart after progesterone-carbachol derivative alone and after the following compounds; mifepristone (progesterone receptor blocker), yohimbine (α2 adreno-receptor antagonist), ICI 118,551 (selective β2 receptor blocker), atropine (non-selective muscarinic receptor antagonist), methoctramine (antagonist of M2 receptor) and L-NAME (inhibitor of nitric oxide synthase).

RESULTS

The results show that progesterone-carbachol derivative [10(-9) mM] significantly decreased perfusion pressure (P=0.005) and coronary resistance (P=0.006) in isolated rat heart. Additionally, the effect of progesterone-carbachol on perfusion pressure [10(-9) to 10(-4) mM] was only blocked in the presence of methoctramine and L-NAME.

CONCLUSIONS

These data suggest that progesterone derivative exert its effect on perfusion pressure via activation of the M2 muscarinic. In addition, this phenomenon involves stimulation of nitric oxide synthase (NOS).