Antihypertensive effect of 3,3,5,5-tetramethyl-4-piperidone, a new compound extracted from Marasmius androsaceus.

AIM OF THE STUDY: To evaluate the antihypertensive effect of 3,3,5,5-tetramethyl-4-piperidone (TMP), a new compound extracted from Marasmius androsaceus. Besides, the hemodynamic profiles and pertinent mechanism of the compound were explored. MATERIALS AND METHODS: Acute and chronic antihypertensive effects of TMP were examined in spontaneous hypertensive rats (SHRs) and reno-hypertensive rats (two kidneys one clip model, 2K1C). Anesthetized dogs were used to evaluate the hemodynamic effects of TMP. Moreover, the cat nictitating membrane response was used to test the ganglionic blocking property of TMP. RESULTS: TMP (2.5, 5 and 10mg/kg, p.o.) notably reduced the blood pressure of SHR in 30 min. Two-week administration of TMP (2.5, 5 and 10mg/kg, p.o.) also decreased the blood pressure of 2K1C rats. TMP (30 mg/kg, i.v.) abolished the response of the nictitating membrane induced by preganglionic stimulation. The results of hemodynamic study in anesthetized dogs showed that, except for the reduction in blood pressure and left ventricular work, no other changes were detected. The results of heart rate variability analysis indicated an intact sympathetic-vagal balance after TMP treatment. CONCLUSIONS: TMP is a new antihypertensive compound, and the effect is partially related to ganglionic blocking.