||Tilianin has anti-inflammatory, antiatherogenic, antihypertensive and vasorelaxant activities, mediates relaxation and antihypertension mainly by an endothelium-dependent manner, probably due to NO release, and also through an endothelium-independent pathway by opening K+ channels. Tilianin inhibits the tumor necrotic factor-K (TNF-K)-induced expression of VCAM-1 by 74% and reduces TNF-K-induced activation of nuclear factor-UB in cultured human umbilical vein endothelial cells (HUVECs). |
|Mol Med Rep. 2015 Mar;11(3):2227-33. |
|Cardioprotective effects of tilianin in rat myocardial ischemia-reperfusion injury.[Pubmed: 25405380 ]|
|Tilianin, the main effective flavonoid monomer enriched from Dracocephalum moldavuca L., has been shown to have cardioprotective effects. However, the mechanism of Tilianin cardioprotection remains largely unknown. The present study aimed to investigate the effects of Tilianin preconditioning on myocardial ischemia/reperfusion injury and to analyze the possible mechanism of action.
METHODS AND RESULTS:
A total of 48 male Sprague Dawley rats were randomized into sham, model myocardial ischemia/reperfusion injury (MI/RI), propranolol hydrochloride positive control, and high‑, medium‑ and low‑dose Tilianin groups (n=8 each). The results showed that Tilianin preconditioning significantly increased ATPase activity (P<0.01 and P<0.05) as compared with the model group. With regards to the regulation of endothelial function, significant decreases (P<0.01 and P<0.05) were detected in the serum NO levels and myocardial NOS activity when Tilianin was administered to MI/RI rats, as compared with the model group, . In addition, the Tilianin drug groups exhibited dose‑dependent reductions in the serum levels of endothelin 1 and thromboxane B2, and increases in the serum levels of calcitonin gene‑related peptide and 6‑keto prostaglandin F1a as compared with the model group (P<0.01 and P<0.05). Notably, the administration of Tilianin significantly inhibited apoptosis, as evidenced by an increase in Bcl‑2 expression, and reductions in Bax and caspase‑3 mRNA expression levels (P<0.01 and P<0.05).
These data indicate that pretreatment with Tilianin exerts potent cardioprotective effects in rats with MI/RI. The anti‑MI/RI effects comprised relieving calcium overload, correction of energy metabolism, improvement of endothelial function and inhibiting cell apoptosis.
|Biochem Pharmacol. 2009 Jul 1;78(1):54-61. |
|Antihypertensive and vasorelaxant effects of tilianin isolated from Agastache mexicana are mediated by NO/cGMP pathway and potassium channel opening.[Pubmed: 19447223]|
|Current investigation was undertaken to elucidate the mode of action of Tilianin, isolated from Agastache mexicana, as a vasorelaxant agent on in vitro functional rat thoracic aorta test and to investigate the in vivo antihypertensive effect on spontaneously hypertensive rats (SHR).
METHODS AND RESULTS:
Tilianin (0.002-933 microM) induced significant relaxation in a concentration- and endothelium-dependent and -independent manners in aortic rings pre-contracted with noradrenaline (NA, 0.1 microM), and serotonin (5-HT, 100 microM). Furthermore, Tilianin (130 microM) provoked a significant displacement to the left in the relaxation curve induced by sodium nitroprusside (SNP; 0.32 nM to 0.1 microM). Moreover, Tilianin induced significant in vitro NO overproduction (1.49 +/- 0.86 microM of nitrites/g of tissue) in rat aorta compared with vehicle (p < 0.05). In addition, pre-treatment with tetraethylammonium (TEA, 5 mM) and 2-aminopyridine (2-AP, 0.1 microM) shifted to the right the relaxant curve induced by Tilianin (p < 0.05). Finally, a single oral administration of Tilianin (50 mg/kg) exhibited a significant decrease in systolic and diastolic blood pressures (p < 0.05) in SHR model.
Results indicate that Tilianin mediates relaxation mainly by an endothelium-dependent manner,probably due to NO release, and also through an endothelium-independent pathway by opening K+ channels, both causing the antihypertensive effect.
|Zhongguo Zhong Yao Za Zhi. 2013 Apr;38(7):1079-82. |
|Study on intestinal absorption of tilianin in rats of single-pass perfusion model.[Pubmed: 23847962]|
| To study the intestinal absorption mechanism of Tilianin in rats. |
METHODS AND RESULTS:
The single-pass perfusion model was established in rats. The concentrations of Tilianin with in situ intestinal perfusion were determined by HPLC. The impact factors, such as verapamil, reserpine, phloridzin and rifampicin, on Ka and Papp of Tilianin in rat jejunum were investigated. Compared with the control group, Ka and Papp in rat jejunum were significantly higher after being added with verapamil and reserpine (P < 0.05). Papp of Tilianin in rat jejunum was significantly lower after being added with phloridzin (P < 0.05). Compared with the control group, both Ka and Papp of Tilianin in rat jejunum were not significantly higher after being added with rifampicin.
Tilianin is the substrate of P-gp, BCRP and SGLT1. The effluent effect of P-gp and BCRP is the main mechanism of Tilianin in intestinal absorption, indicating that Tilianin can realize intestinal absorption and transport by relying on SGLT1. Tilianin is not the substrate of bile salt transporter protein.