| Description: |
Beta-Amyrin palmitate may release norepinephrine from newly synthesized pools, and thus, it may activate noradrenergic activity. Beta-Amyrin palmitate, like mianserin and imipramine, reduces the duration of immobility of mice significantly in a dose-dependent manner (5, 10 and 20 mg kg-1); (1)Beta-Amyrin palmitate or mianserin elicits a dose-related reduction in locomotor activity of mice and antagonizes locomotor stimulation induced by methamphetamine, imipramine increases locomotor activity and potentiates methamphetamine-induced hyperactivity; (2)Beta-Amyrin palmitate shows no effect on reserpine-induced hypothermia, whilst mianserin (10 mg kg-1) and imipramine (10 and 20 mg kg-1) antagonizes the reserpine-induced effect; (3)Beta-amyrin palmitate has similar properties in some respects to mianserin and might possess a sedative action. |
| In vivo: |
| J Pharm Pharmacol. 1993 Jun;45(6):545-50. | | Pharmacological properties of beta-amyrin palmitate, a novel centrally acting compound, isolated from Lobelia inflata leaves.[Pubmed: 8103103] | Effects of beta-Amyrin palmitate isolated from the leaves of Lobelia inflata were studied on the central nervous system of mice and were compared with those of antidepressant drugs, mianserin and imipramine.
METHODS AND RESULTS:
In the forced swimming test, beta-Amyrin palmitate, like mianserin and imipramine, reduced the duration of immobility of mice significantly in a dose-dependent manner (5, 10 and 20 mg kg-1). beta-Amyrin palmitate (5, 10 and 20 mg kg-1) or mianserin (5, 10 and 20 mg kg-1) elicited a dose-related reduction in locomotor activity of mice and antagonized locomotor stimulation induced by methamphetamine. In contrast, imipramine (5, 10 and 20 mg kg-1) increased locomotor activity and potentiated methamphetamine-induced hyperactivity. beta-Amyrin palmitate showed no effect on reserpine-induced hypothermia, whilst mianserin (10 mg kg-1) and imipramine (10 and 20 mg kg-1) antagonized the reserpine-induced effect. Unlike imipramine, beta-Amyrin palmitate and mianserin did not affect haloperidol-induced catalepsy, tetrabenazine-induced ptosis and apomorphine-induced stereotypy. beta-Amyrin palmitate and imipramine had no effects on the head-twitch response induced by 5-hydroxytryptophan, whereas mianserin (5, 10 and 20 mg kg-1) decreased it in a dose-dependent manner. A potentiating effect of beta-Amyrin palmitate (5, 10 and 20 mg kg-1) on narcosis induced by sodium pentobarbitone was stronger than that of imipramine (10, 20 and 40 mg kg-1) but weaker than that of mianserin (2.5, 5 and 10 mg kg-1).
CONCLUSIONS:
These results suggest that beta-Amyrin palmitate has similar properties in some respects to mianserin and might possess a sedative action. | | J Pharm Pharmacol. 1993 Nov;45(11):1006-8. | | An alpha-adrenoceptor-mediated mechanism of hypoactivity induced by beta-amyrin palmitate.[Pubmed: 7908030] |
METHODS AND RESULTS:
Inhibitory effects of beta-Amyrin palmitate in locomotor activity of mice were studied by combining this compound with alpha-adrenergic agonists or antagonists and a dopaminergic agonist. beta-Amyrin palmitate (2.5, 5.0 and 10.0 mg kg-1, i.p.) decreased locomotor activity of mice in a dose-dependent manner. It enhanced hypoactivity of mice treated with clonidine (0.025 mg kg-1, i.p.) and antagonized hyperactivity produced by phenylephrine (40 micrograms, i.c.v.). The inhibitory action of beta-Amyrin palmitate was not affected by yohimbine (1.5 mg kg-1, i.p.), but was potentiated by prazosin (0.75 mg kg-1, i.p.). When combined with a dopaminergic agonist, apomorphine (2.0 mg kg-1, i.p.), beta-Amyrin palmitate (5.0 and 10.0 mg kg-1, i.p.) did not affect locomotor stimulation produced by apomorphine.
CONCLUSIONS:
These results suggest that beta-Amyrin palmitate might inhibit alpha 1-adrenoceptors. | | Phytomedicine. 2012 Jun 15;19(8-9):682-5. | | β-Amyrin acetate and β-amyrin palmitate as antidyslipidemic agents from Wrightia tomentosa leaves.[Pubmed: 22541636 ] | The ethanolic extract and fractions of Wrightia tomentosa Roem. & Schult (Apocynaceae) leaves were tested in vivo for their antidyslipidemic activity in high fat diet (HFD) induced dyslipidemic hamsters.
METHODS AND RESULTS:
Activity guided isolation resulted in identification of antidyslipidemic compounds β-Amyrin acetate and beta-Amyrin palmitate. β-Amyrin acetate and beta-Amyrin palmitate decrease the levels of LDL by 36% and 44%, and increase the HDL-C/TC ratio by 49% and 28%, respectively, at a dose of 10mg/kg. In addition, the isolated compounds β-Amyrin acetate and beta-Amyrin palmitate showed significant HMG-CoA-reductase inhibition, which was further established by docking studies. |
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