Lauro F. V, Marcela R. N, Virginia M. A, Socorro H. M, Francisco D. C, Elodia G. C, Eduardo P. G, Rolando G. M, Regina C. C, Saidy E. H, Perla P. G. Evaluation of Biological Activity Exerted by an Aza-Bicyclo-Carboxylic Acid Derivative Using an Ischemia-Reperfusion Injury Model. Biomed Pharmacol J 2018;11(4).

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Figueroa-Valverde Lauro^1,, Rosas-Nexticapa Marcela², Mateu-Armand Virginia², Herrera-Meza Socorro³, Díaz-Cedillo Francisco⁴, García-Cervera Elodia¹, Pool-Gómez Eduardo¹, García-Martínez Rolando¹, Cauich-Carrillo Regina¹, Euan-Hau Saidy¹, Parra-Galindo Perla²

¹Laboratory of Pharmaco-Chemistry, Faculty of Chemical Biological Sciences, University, University Autonomous of Campeche, Av. Agustín Melgar s/n, Col Buenavista C.P. 24039 Campeche, Camp.,México.

²Facultad de Nutrición, Universidad Veracruzana, Médicos y Odontologos s/n C.P. 91010, Unidad del Bosque Xalapa Veracruz, México.

³Instituto de Investigaciones Psicológicas, Universidad Veracruzana. Av. Dr. Luis Castelazo Ayala s/n Col Industrial Animas. C.P. 91190, Xalapa, Veracruz, México.

⁴ Escuela Nacional de Ciencias Biológicas del Instituto Politécnico Nacional. Prol. Carpio y Plan de Ayala s/n Col. Santo Tomas, México.

Corresponding Author E-Mail: rosasnm@yahoo.com.mx

DOI : https://dx.doi.org/10.13005/bpj/1559

Abstract

The main objective of this study was to evaluate the biological activity of a new compound (derived from aza-bicyclo-carboxylic acid) against heart failure caused by the ischemia- reperfusion phenomenon. In addition, to characterize de molecular mechanism involved in the effect exerted by aza-bicyclo-carboxylic acid against infarction area, some drugs such as prazosin, metoprolol, propanolol, tamoxifen, flutamide, finasteride, nifedipine, levosimedan, adenosine, rolofylline, isoproterenol and the compound ZM-241385 were used as pharmacological tools.  The data found indicated that biological activity induced by compound 3 on infarction area only was similar at effect exerted by adenosine; however, the effect produced by compound 3 was blocked with of rolofylline. Other data showed that the biological activity of compound 3 decreases the cAMP levels in a time-dependent manner. In conclusion, the results indicate that compound 3 can produce a cardioprotective effect against myocardial ischemia-reperfusion injury translated as a decrease on infarction area; this phenomenon involves A₁-adenosine receptor activation and, as a result may cause changes in cAMP levels.

Keywords

Adenosine; Camp; Ischemia; Reperfusion; Rolofylline

Introduction

Heart failure is the main cause of death in patients with heart disease^1-3; this phenomenon is due to the cardiac myocyte cell death caused by prolonged myocardial ischemia that can be translated as myocardial infarction, which consequently results in some changes in the cardiac work of both ventricles.^4,5 Several reports suggest that restoration of blood flow in some case can decrease the cardiac necrosis; nevertheless, other studies indicate that the reperfusion may increase the tissue injury.⁶ It is important to mention, that there are several drugs such as the Cyclosporin-A which showed biological activity against ischemia-reperfusion injury in an animal model.⁷ Other data indicate that rapamycin which can exert benefic effects on myocardial infarction in isolated mouse heart via mitochondrial potassium channel activation.⁸ In addition, a study showed that glibenclamide reduces myocardial damage in ischemia-reperfusion model through potassium channel activation.⁹ Also, a study showed that a benzenamine-derivative (SEA0400) can decrease the reperfusion injury using some “in vitro” and “in vivo” models.¹⁰ Recently, a study showed that a naphthalene-prazosin derivative exerts a cardioprotective effect against myocardial necrosis after ischemia-reperfusion injury via the calcium channels activation.¹¹ All these results indicate that some compounds may exert effects on reperfusion-injury; however, the cell site where they produce their biological activity is not very clear. To characterize this phenomenon, the biological activity exerted by an aza-bicyclo-carboxylic acid derivative was evaluated using an ischemia-reperfusion injury model.

Material and Methods

General methods.

The compounds 3-(2-Amino-ethyl)-1,5-dinitro-9-(3-oxo-butyl)-3-aza-bicyclo [3.3.1]non-6-ene-7-carboxylic acid (1) and (2-Acetyl-9a-methyl-7-oxo-dodecahydro-cyclopenta[a] naphthalen-8-yl)-acetic acid (2) were prepared using a previously methods reported.^12,13 All chemicals were analytical grade supplied by Sigma-Aldrich Co. Ltd. Elemental analysis was performed with an elemental analyzer (Perkin Elmer Ser. II CHNS/0 2400). Infrared spectra were recorded with a FTR iS50 apparatus. Mass spectra were recorded with a Finnigan Trace GCPolaris Q. NMR spectra were obtained using a Varian VXR-300/5 FT NMR spectrometer at 300 and 75.4 MHz in CDCl₃.

Chemical synthesis

Synthesis of 3-{2-[2-(2-Acetyl-9a-methyl-7-oxo-dodecahydro-cyclopenta[a]naphtha- lene-8-yl)-acetylamino]-ethyl}-1,5-dinitro-9-(3-oxo-butyl)-3-aza-bicyclo[3.3.1]non-6-ene-7-carboxylic acid (3)

In a round bottom flask (10 ml), the compound 1 (200 mg, 0.55 mmol), compound 2 (60 µl, 0.90 mmol), boric acid (50 mg, 0.80 mmol) and 5 ml of methanol were placed. After, the mixture was stirred for 72 h to room temperature. The reaction product was dried under reduced pressure and purified by crystallization using the methanol:water (4:1) system.

Biological activity

All experimental procedures and protocols used in this investigation were reviewed and approved by the Animal care and use committee of Autonomous University of Campeche (Faculty of Chemical-Biological Sciences) with No. PI-420/12 and were in accordance with the Guide for the Care and Use of Laboratory Animals.¹⁴ Male Wistar rats; weighing 200-250 g were obtained from Pharmacochemistry Laboratory of University Autonomous of Campeche (Faculty of Chemical-Biological Sciences).

Reagents

It is noteworthy, that drugs involved in this study were dissolved in methanol and from this solution all dilutions were obtained using a Krebs-Henseleit* solution (v/v).

Experimental Design I

Animals were anesthetized with pentobarbital (50 mg/Kg body weight) via intraperitoneal administration. After the animal was opened by a thoracic abdominal laparotomy and the heart was perfused via retrograde with the Krebs-Henseleit solution through a non-circulating perfusion system with a constant flow rate. It is important that the study population involved in each group was n = 9.

*Krebs-Henseleit solution (pH = 7.4, 37°C) composed by following system;  117.8 NaCl; 6 KCl; 1.75 CaCl₂; 1.2 NaH₂PO₄; 1.2 MgSO₄; 24.2 NaHCO₃; 5 glucose and 5 sodium pyruvate (mmol). The solution was then bubbled with a mixture of O₂/CO₂ (95:5/5 %). The coronary flow (10 ml/min) was adjusted with a peristaltic pump and a period of equilibration was carried out for 15 min.

Ischemia-Reperfusion model

It is important to mention that after the equilibrium time; the hearts underwent a period of ischemia for 40 minutes due to closure of the perfusion system such as indicate some reports¹⁵ in absence (control) or presence of each of drug involved in this study (see design experimental). Following, the system was restarted and the hearts were reperfused by other 40 minutes with Krebs-Henseleit solution.

Histological Analysis

For histological evaluation, the technique modifies reported by Engelhardt¹⁶ was used.  Cross sections from the heart were fixed with 10% paraformaldehyde for 8 h. Then, the samples are placed in a histocasette (Leica Mod. TP1020 SN: 042231418), for 12 h to be processed. After, the sections of heart were placed in a Paraffin Embedding Center (Leica EG1160 model) to form paraffin blocks which are cut into 2 µm slices using an aparatus Leica 50138178 model and following were introduced to bath water (Riossa-Rocha B7 SN: 070909 model). Then, the samples were placed on a slide, which was dried at 60 ^oC for 30 minutes in a Binder-ED23 apparatus. After, a solution of ethanol:xylol (1: 1) was added to the slides for cell clearance; then of 10 minutes, was washed with distilled water. To observe the tissue morphology, hematoxylin is added to the sample (for 1 minute), after which time it is washed again. Then eosin is added for 1 minute. Finally, ethanol/xylol     (1:1) is added to the sample and the tissue is observed under the microscope. For morphometrical analysis, photographs of 20 ventricular sections were taken at 3320 magnifications (ZeissIM-35).

Biological Evaluation

Step I

Effects induced by the compound 1 against infarct area

The effect induced by the compound 1 on ischemia-reperfusion injury (translated as infarction area) was evaluated at dose of 0.001-100 nM.

After of each experiment the hearts were cut into two sections at right angles to the vertical axis. It is important to mention that the areas of the normal left ventricle non-risk region, area at risk, and infarct region were evaluated using a previously reported method.^17,18

Biological activity produced by the compounds 1, 2 and 3 against infarct area

The effect induced by the compounds 1, 2 and 3 (at a dose of 0.001 nM) on the ischemia-reperfusion injury (translated as infarction area) was determined.

Step II

The biological activity induced by compound 3 on ischemia-reperfusion injury translated as infarction area was compared with effect exerted by different drugs involved in this study. In addition, it noteworthy that different doses administered in this study of each drug used as pharmacological tools have been previously reported^17-27.

Evaluation of biological activity of the compound 3 against infarction area via sex hormons

The effect induced by the compounds 3 (0.001 nMm/min) or tamoxifen(1 nMm/min) or finasteride (nMm/min) or flutamide (nMm/min) on the ischemia-reperfusion injury (translated as infarction area) was determined.

Determination of biological effect of the compound 3 against infarction area through of adrenergic system

The effect exerted by the compounds 3 (0.001 nM) or prazosin (nMm/min), or propanolol (nMm/min) or metoprolol (nMm/min), on the ischemia-reperfusion injury (translated as infarction area) was asses.

Evaluation of biological activity of the compound 3 against infarction area via calcium channels

The effect induced by the compounds 3 (0.001 nM) or nifedipine (10 nM/min) or levosimedan (0.1 μM/min) on the ischemia-reperfusion injury (translated as infarction area) was determined.

Determination of biological effect of the compound 3 against infarction area through phosphodiesterase inhibition

The effect exerted by the compounds 3 (0.001 nM) or milrinone (0.025 μM/min), on the ischemia-reperfusion injury (translated as infarction area) was asses.

Evaluation of biological activity of the compound 3 against infarction area via ATP-ase inhibition

The effect induced by the compounds 3 (0.001 nM) or digoxine (20 μM/min) on the ischemia-reperfusion injury (translated as infarction area) was determined.

Determination of biological effect of the compound 3 against infarction area through purinergic system

The effect exerted by the compounds 3 (0.001 nM) or adenosine (140μg/min), on the ischemia-reperfusion injury (translated as infarction area) was asses.

Step III

Biological activity exerted of compound 3 against infarct area via adenosine receptors

The compound 3 was perfused (1 nM/min) in the hearts and infarct area was evaluated; then this experiment was repeated in presence of rolofylline (1 µM)²⁸ or ZM- 241385 (1 ´  10^-7 M/min).²⁹

Step IV

Effect exerted of Compound 3 on cAMP concentration

Isoproterenol (100 nM / min) was perfused on the heart for 3, 6, 9, 12 or 18 minutes and its effect on cAMP levels was determined using a previously reported method.^39,31 After, the results obtained were compared with the biological activity exerted by the compound 3 (1 nM/min) and control on the concentration of cAMP.

Statistical analysis

The results were expressed as average ± SE, using each heart (n = 9) as its own control. In addition, the results were analyzed via Analysis of Variance using the SPSS 12.0 program.³² The differences in the values found were determinates with p = 0.05.

Results

Preparation of compound 3

Aza-bicyclo-carboxylic acid derivative (compound 3) was prepared by the reaction of 1 with 2 in presence of boric acid; yielding 75% of product (Figure 1) (melting point of 90-92°C). The infrared spectrum involved in compound 3 showed several signals at 1712, 1705, 1630 and 1320 (Vmax, cm^-1). Additionally, the ¹H NMR (Figure 1 and Table 1) and ¹³ C NMR (Table 2) for the compound 3 are showed down. Finally, the results of mass spectroscopy (MS) (70 ev) shown; m/z 658.32. Theoretical elementary analysis for the compound 3 (C₃₃H₄₆N₄O₁₀) showed the following results; C, 60.17; H, 7.04; N, 8.51; 0, 24.29; and experimental elementary analysis found was C, 60.08; H, 7.00.

Figure 1: Synthesis of an aza-bicyclo-carboxylic acid (3). In the scheme A is shown the reaction of amino-bicyclo derivative (1) with the compound (2-Acetyl-9a-methyl-7-oxo-dodecahydro-cyclopenta[a]naphthalen-8-yl)-acetic acid (2) to form 3 using boric acid as catalyst (i). In addition, the 1H NMR (scheme B) showed two signals characteristic for the compound 3 at  0.90 and 2.10 ppm for methyl groups; at 10.40 ppm for both amide and hydroxyl groups. Click here to View figure

Table 1: Spectra data of  ¹H NMR (proton nuclear magnetic resonance; 300 MHz, CDCl₃) for the compound 3.

Biological activity

Biological activity induced by the compound 3 against ischemia injury at dose of 0.001-100 nM

The data indicated that compound 3 significantly decreased (p = 0.05) infarct size (percentage of area at risk) in a dose-dependent manner in comparison with the control (Figure 2).

Figure 2: Effect exerted by the compound 3. The experimental data found shown that the compound 3 significantly decreased infarct size (expressed as a percentage of the area at risk) in a dose-dependent manner compared with the vehicle-treated hearts. The values indicate the mean ± S.E. of 9 experiments. D1 [0.001 nM]; D2 [0.01 nM]; D3 [0.1 nM]; D4 [1 nM]; D5 [10 nM] D6 [100 nM]. Click here to View figure

Histological issue evaluation

In the Figures 3 and 4 are shown a marked disruption of the myocardial structure characterized by appearance of extensive necrosis in conditions control; however this is lower in presence of compound 3.

Effects exerted by the compound 1-3

The biological activity induced by the compounds 1, 2 and 3 at a dose of 0.001 nM/min on infarct area were evaluated using an ischemia injury model. The experimental data found shown that compound 3 significantly decreases (p = 0.05) the infarct area compared with compounds 1, 2 and control conditions (Figure 5).

Figure 3: The scheme shown the myocardial tissue infarction is higher in vehicle (A, C) treated rats subjected to occlusion (for 40 min and reperfusion for 40 min); however, in presence of the compound 3 (B, D) this phenomenon was lower. Click here to View figure

Effects induced by the compound 3 against ischemia-reperfusion injury via sex hormones

The effect exerted by the compounds 1, 2, 3 and control conditions on infarct area were evaluated using an ischemia-reperfusion injury model (Figure 6). The results shown that compound 3 [0.001 nM/min] exert different biological activity (p = 0.05) compared with finasteride or tamoxifen or flutamide at dose of 1 nM.

Figure 4: Histological evaluation of effect exerted by compound 3 against ischemia-reperfusion using the technique modifies reported by Engelhardt [28]. In the scheme E (control) a marked alteration of the structure of the myocardium section characterized by the appearance of extensive necrosis, bands of contraction and thinning of myofibrils were observed. In addition, in the scheme F is shown a decreased of myocardial necrosis by presence of compound 3. Click here to View figure

Effect induced by the compound 3 against ischemia-reperfusion injury via adrenergic system

The results showed in the Figure 7, indicated that biological activity exerted by the compound 3 at dose of 0.001 nM significantly decrease (p = 0.05) the infarct area compared with prazosin, propanolol or metoprolol at dose of [1 nM/min].

Figure 5: Biological activity induced by the compound 3 against ischemia-reperfusion injury. The experimental data found shown that the compound 3 significantly (p = 0.05) reduced infarct size expressed as a percentage of the area at risk compared with the compounds 2 or 3 and the control.  Each bar represents the mean ± S.E. of 9 experiments. Click here to View figure

Effect produced by the compound 3, nifedipine and levosimedan on ischemia-reperfusion injury

In the Figure 7 is shown the biological activity of compound 3 [1nM], nifedipine [10 nM/min] and levosimedan [0.1µM/min] against ischemia-reperfusion injury. The experimental data found indicated that effect exerted by 3 was lower (p = 0.05) compared with nifedipine and levosimedan.

Biological activity induced by the compound 3, milrinone, digoxine and adenosine against ischemia-reperfusion injury

The experimental data (Figure 8) shown that effect induced by the compound 3 [0.001 nM] was lower (p = 0.05) compared with milrinone [0.025 mM/min]. However this effect was in a similar manner to biological activity exerted by adenosine [140μg/min] on infarct area.

Figure 6: Effect induced by the compound 3 or flutamide or finasteride or tamoxifen against ischemia-reperfusion injury translated as infarct size. The experimental data found shown that the compound 3 significantly (p = 0.05) reduced infarct size (expressed as a percentage of the area at risk) compared with flutamide or finasteride or tamoxifen and the control. Each bar represents the mean ± S.E. of 9 experiments. Click here to View figure

Biological activity induced by the compound 3 in presence or absence of rolofylline or ZM-241385

The results (Figure 9) showed that compound 3 decrease the infarct area at dose of 1 nM; however, this phenomenon was significantly inhibited (p = 0.05) by rolofylline [1 ´ 10^-7 M].

Figure 7: Biological activity exerted by the compound 3 or levosimedan or nifedipine against ischemia-reperfusion injury translated as infarct size. The experimental data shown that effect exerted by compound 3 (p = 0.05) is lower compared with levosimedan or nifedipine and the control. The values indicate the mean ± S.E. of 9 experiments. Click here to View figure

Biological activity of compound 3 and isoproterenol on the cAMP levels

The experimental data (Figure 10) shown that effect exerted by the compound 3 [1 nM] was lower (p = 0.05) compared with isoproterenol [100 nM] and conditions control.

Figure 8: Effect induced by milrinone, digoxine, adenosine and the compound 3 against ischemia-reperfusion injury translated as myocardium infarct. The results showed that the biological activity of compound 3 was lower (p = 0.05) compared with digoxine and milrinone; however, there is no significantly difference with adenosine. The values indicate the mean ± S.E. of 9 experiments. Click here to View figure

Discussion

Several drugs have been used for treatment of ischemia-reperfusion such as propofol,³³ methylene blue,³⁴ resveratrol,³⁵ rapamycin,³⁶ nitro-derivative³⁷ and others; however, each drug exerts its biological activity on the ischemia-reperfusion injury, through of several molecular mechanisms; this phenomenon could be the result of its different chemical characteristics. Therefore, in this study was prepared a new drug (aza-bicyclo-carboxylic acid derivative) to evaluate their biological activity against ischemia-reperfusion injury.

Chemical synthesis

There are several methods for preparation of azabicyclic; however, some reagents used require special conditions^38-40; analyzing this data, in this report a new azabicyclic derivative was prepared using different chemical strategies. It is noteworthy, that in this reaction an amino-bicyclo (compound 1) was bound to the carboxyl group of oxo-naphthalene-acetic acid (compound 2) to form the compound 3 (C₃₃H₄₆N₄O₁₀) using boric acid as catalyst (Figure 1). Chemical structure of compound 3 was determinate using NMR spectroscopy (Table 1 and Table 2). The ¹H NMR spectrum of the compound 3 showed signals at 0.90 ppm for methyl bound to dodecahydro-cyclopenta[a]naphthalene system; at 2.10 ppm for methyl bound to ketone groups; at 1.66, 1.88, 3.04-3.06 and 3.66 ppm for methylene groups involved in the arm bound to bicyclic ring; at 2.20 and 2.34 ppm for methylene group bound to both to dodecahydro-cyclopenta[a]naphthalene system and amide group; at 3.04, 3.19-3.52, 3.86-8.46 ppm for bicycle ring; at 3.18 ppm for arm bound to both amino and amide groups; at 10.40 ppm for both amide and hydroxyl groups. The ¹³ C NMR spectra displays chemical shifts at 14.22 ppm for methyl group bound to dodecahydro-cyclopenta[a]naphthalene system; at 27.86-29.60 ppm for methyl group bound to both ketone groups; at 18.90, 40.80, 56.72 and 59.08 ppm for methylene groups involved in the arm bound to bicyclic ring; at 34.48, 58.62, 93.04-142.10 ppm for bicycle ring; at 38.49 ppm for methylene group bound to both dodecahydro-cyclo- penta[a]naphthalene system and amide group; at 42.74 and 50.08 ppm for arm bound to both amino and amide groups; 167.72 ppm for carboxyl group; at 175.90-210.70 ppm for ketone groups. Finally, mass spectrum of compound 3 showed a molecular ion at m/z 658.32.

Table 2: Spectra data of  ¹³C NMR (proton nuclear magnetic resonance; 300 MHz, CDCl₃) for the compound 3.

Biological activity

Effect induced by the compound 3 against ischemia injury.

In this study, biological activity induced by the compound 3 to different doses against infarct area were evaluated using an ischemia-reperfusion injury model. The experimental data found shown that compound 3 decreased the infarct area in a dose-dependent manner. Analyzing these results, other experiments were also carried out, in which the biological activity of compounds 1 and 2 was evaluated, to rule out the possibility that any of these compounds could exert some effect on the ischemia-reperfusion injury. The results showed that compound 3 significantly decrease the infarct area compared with compounds 1, 2 and control conditions (Figure 2 and 3); this phenomenon, indicated that the different functional groups involved in the chemical structure of 3 are the responsible for their biological activity against the ischemia-reperfusion injury translated as a reduction on infarction area.

Figure 9: Biological activity exerted by the compound 3 against ischemia-reperfusion injury translated as myocardium infarct in absence or presence of rolofylline and ZM- 241385. The experimental data found shown that the compound 3 significantly (p = 0.05) reduced infarct size (expressed as a percentage of the area at risk); however, this phenomenon was inhibited in presence of rolofylline. The values indicate the mean ± S.E. of 9 experiments. Click here to View figure

Figure 10: Biological activity induced by the compound 3 and isoproterenol on cAMP levels through of time. The experimental data found shown that cAMP levels was lower (p = 0.05) in the presence of the compound 3 compared with isoproterenol (3-18 min) and the control. The values indicate the mean ± S.E. of 6 experiments. Click here to View figure

Characterization of molecular mechanism involved in the biological activity induced by the compound 3 against ischemia-injury.

Analyzing data above mentioned and other reports which suggest that some drugs can produce effects on ischemia injury via activation of 5-alpha-reductase⁴¹ or interaction with both androgens and estrogens receptors^42,43; in this study, the effect exerted by finasteride (5-alpha-reductase inhibitor) or tamoxifen (estrogen receptor antagonist) or flutamide (androgen receptor inhibitor) against ischemia-reperfusion injury was determinate and compared with the effect exerted by compound 3. The results shown that compound 3 exert different biological activity compared with finasteride or tamoxifen or flutamide (Figure 4); these results suggest that molecular mechanism involved in the effect induced by the compound 3 on ischemia-reperfusion injury was not via sex hormones activation.

On the other hand, also, other reports which suggest that ischemia-reperfusion injury may be reduced via adrenergic system activation^44-46 were analyzed. Therefore, in this experimental study, the pharmacological activity exerted by prazosin or propranolol or metoprolol on ischemia injury was evaluated and compared with effect produce by compound 3 against ischemia-reperfusion injury. The data found shown that infarct area was lower in presence of compound 3 in comparison with prazosin, propanolol or metoprolol; this data suggest that effect exerted by the compound 3 on ischemia-reperfusion injury was not via a₁ or b₁ receptors activation.

Analyzing these data, and other studies which suggest that some drugs can induce effects against ischemia-reperfusion injury via calcium channel activation^47,48; in this experimental investigation, the pharmacological activity induced by nifedipine (calcium antagonist) or levosimedan (calcium sensitizer)⁴⁹ on ischemia-reperfusion injury was evaluated and compared with the biological activity induced by compound 3. The experimental results found shown that effect exerted by 3 was lower in comparison with nifedipine and levosimedan; this data indicated that molecular mechanism involved by 3 was not via calcium channels activation.

On The other hand, in this study was also validated the effect exerted by milrinone (phosphodiesterase inhibitor III)⁵⁰ on myocardial infarct size to compare with biological activity exerted by compound 3. The experimental data indicated that compound 3 decreased  infarct area was lower in comparison with biological activity of milrinone; these data indicated that molecular involved in the effect exerted by the compound 3 was not through of inhibition or activation of some phosphodiesterase.

In the search for the possible molecular mechanism involved in the effect exerted by compound 3, other reports were also analyzed; these studies indicate that ischemia-reperfusion in the subepicardial regions of ischemic tissue can be reduced in the presence of digoxin.⁵¹ Therefore, the effect produced by digoxin on ischemia-reperfusion injury was determined and compared with the effect exerted by the compound 3. The experimental data found shown that digoxin decreased the infarct area in comparison with control conditions; however, it is noteworthy that this effect was different compared with the compound 3; this results indicated that molecular mechanism was not via Na⁺/K⁺-ATPase inhibition.

Finally, other experiments were carried out to characterize the mechanism by which compound 3 induces its effect against ischemia-reperfusion injury. In this sense, the effect exerted by adenosine on the ischemia-reperfusion injury was evaluated and compared with the biological activity exerted by compound 3. The experimental data showed that the infarct area decreased in a similar way to the biological activity induced by compound 3. These results suggest that molecular mechanism could involve adenosine receptors⁵²; to check this hypothesis; the effect exerted by compound 3 against ischemia-reperfusion injury was evaluated in presence of rolofylline (A₁-adenosine receptor antagonist)⁵³ or ZM-241385 (A₂-adenosine receptor inhibitor).⁵⁴ The experimental data found  shown that biological activity exerted by the compound was only inhibited in presence of rolofylline; this results indicated that the molecular mechanism involved in the biological activity exerted by the compound 3 against ischemia-reperfusion injury which is translated as a decrease in the area of infarction was via A₁-receptor activation; however, it is noteworthy that there are other reports which indicate that A₁-Adenosine receptor activation can induce changes in cAMP levels⁵⁵. Therefore, also the effect exerted by compound 3 on cAMP concentration was evaluated using isoproterenol as control. The experimental data found shown that compound 3 decreased the cAMP levels (3-18 min) in comparison with isoproterenol and control conditions. These results suggest that effect exerted by the compound 3 against ischemia-reperfusion injury translated as decreased of infarct area involves A₁-adenosine receptor activation and consequently brings changes of cAMP levels.

Conclusions

The results indicate that compound 3 can produce a cardioprotective effect against myocardial ischemia-reperfusion injury translated as a decrease on infarction area; this phenomenon involves A₁-adenosine receptor activation and, as a result may cause changes in cAMP levels.

Acknowledgement

None

Conflict of interest

The authors declare that they have no conflict of interest with any institutions.

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