The effect of isosorbide-5-mononitrate on ivabradine hydrochloride pharmacokinetics in beagles / 中国药学杂志

OBJECTIVE: To study the effect of isosorbide-5-mononitrate (5-ISMN) on ivabradine hydrochloride pharmacokinetics in Beagles.

Effect of banxia baizhu tianma decoction on the vascular endothelial function of spontaneous hypertensive rats / 中国中西医结合杂志

<p><b>OBJECTIVE</b>To study the vascular endothelial function recovery and its mechanism of Banxia Baizhu Tianma Decoction (BBTD).</p><p><b>METHODS</b>54 SH rats were randomly divided into three groups: the blank control group, BBTD group and Captopril treatment group. BBTD (at the daily dose of 4. 320 g crude drug/kg) and Captopril (at the daily dose of 3.375 g/kg) was administered from the 7th week to the 24th week. Another eighteen Wistar-Kyoto rats of the same ages were taken as the control. Medication was discontinued and effects were observed until the 32nd week. The blood pressure was determined by arterial carotis cannula. The concentration of serum NO2(-) and total anti-oxidation were determined by Griess and fluorescence recovery after photobleaching (FRAP). The acetylcholine (Ach)-dependent relaxation of superior mesenteric artery was detected using in vitro vascular ring. The mRNA expressions of IL-1, IL-6 and iNOS were detected by Real-time PCR at the 18th, 24th, and 32nd week.</p><p><b>RESULTS</b>BBTD could significantly lower blood pressure of SHR and the concentration of serum NO2(-) at the 18th and 24th week (P<0.05). The total anti-oxidation of SH rats increased at the 18th week (P<0.01), and ACh-dependent relaxation of superior mesenteric artery increased at the 24th week. The mRNA expressions of IL-1 was markedly suppressed by BBTD at the 18th, 24th, and 32nd week (P<0.05), while IL-6 and iNOS mRNA expression were significantly lowered only at the 32nd week (P< 0.01). Captopril could significantly lower blood pressure of SHR at the 18th and 24th week (P<0.05). It significantly increased the total anti-oxidation of SH rats at the 18th week (P<0.01). However, it could not increase ACh-dependent relaxation of superior mesenteric artery and regulate the concentration of NO2(-) at the 18th, 24th, and 32nd week. The mRNA expression of iNOS was markedly suppressed by Captopril at the 24th and 32nd week, while mRNA expressions of IL-1 and IL-6 were significantly lower only at the 32nd week (P<0.01).</p><p><b>CONCLUSIONS</b>BBTD showed similar effect in decreasing the blood pressure to captopril, but it showed better effect in improving the mesenteric endothelial dysfunction of SHR, which may be associated with its inhibition on NO and IL-1 expression, and improvement of the oxidative stress state.</p>

Effect of banxia baizhu tianma decoction on the left ventricular hypertrophy of hypertrophied myocardium in spontaneously hypertensive rat / 中国中西医结合杂志

<p><b>OBJECTIVE</b>To investigate the changes in renin angiotensin system (RAS) in hypertrophied myocardium of spontaneous hypertensive rat (SHR), and the effect of Banxia Baizhu Tianma Decoction (BBTD) on the changes in haemodynamic parameters and mRNA of signaling molecules of RAS at different periods.</p><p><b>METHODS</b>Fifty-four male SHRs of 6 weeks old were randomly and equally divided into three groups: the untreated control group, the test group, and the positive control group, and they were treated respectively with distilled water, BBTD and captopril by dissolving in equal volume of water administrated via gavage for 18 weeks. Besides, 18 age matched Wistar-Kyoto (WKY) rats treated with distilled water were allocated in a normal control group. Rats were managed in batches at their age of 18, 24, and 32 weeks old. Rat's hemodynamic parameters were measured through carotid artery catheterization, myocardial pathology was observed, and their mRNA expressions of angiotensin (AGT), angiotensin-converting (ACE) and angiotension-converting 2 (ACE2) were determined by Real-time PCR.</p><p><b>RESULTS</b>Compared with WKY rats, the arterial pressure and left ventricular mass index (LVMI)in SHR were significantly higher at 18, 24 and 32 weeks respectively (P < 0.01); average cycle rate showed in electrocardiogram was higher (P < 0.05), though the blood stream was similar; mRNA expressions of AGT and ACE in heart tissue were markedly higher (P < 0.01), but that of ACE2 at 18 and 24 weeks were lower (P < 0.01). Compared with untreated SHR, arterial pressure at 18 and 24 weeks was lower (P < 0.05); cardiac muscle structure was improved; LVMI at 24 weeks was improved (P < 0.05); the mRNA expressions of AGT and ACE were suppressed but that of ACE2 increased at 18, 24,and 32 weeks significantly in the test group after BBTD treatment (P < 0.05).</p><p><b>CONCLUSIONS</b>Changes in RAS in the hypertrophied myocardium of SHR may be one of the molecular mechanisms for hypertension leading to left ventricular hypertrophy. BBTD can improve the hemodynamic parameters, regulate RAS, so as to lower the arterial pressure.</p>