Add time:07/14/2019         Source:sciencedirect.com

2-methoxy-4-(2-propenyl)phenoxy acetic acid (MPPA) is a synthetic drug previously developed to mimic hypolipidemic activity and reduce side-effects of α-asarone, a vegetal extract used in traditional medicine to treat cardiovascular, neurological and other human disorders. MPPA was here evaluated in a battery of tests previously used to characterize anticonvulsant/neuroprotective and toxic potential of α-asarone in mice. MPPA toxicity was limited and doses up to 100 mg/kg induced neither hypothermia, nor reduction of spontaneous locomotor activity nor failure in rotarod test. Dose-dependent potentiation of the pentobarbital-induced sleeping was, however, observed at doses higher than 12.5 mg/kg. Little or no protection was provided by MPPA against seizures induced by N-methyl-D-aspartate. Moderate protection against subcutaneous pentylenetetrazol- and picrotoxin-induced seizures in mice, along with potentiation of pentobarbital-induced sleep, suggested GABAergic mechanisms. In maximal electroshock-induced seizures, MPPA protected 20% tested mice at 30 mg/kg and shortened recovery phase in convulsing mice, suggesting some action on neuronal voltage-gated sodium channels. High efficacy of MPPA was further observed in magnesium-dependent audiogenic seizures test, a murine model responsive to a variety of anticonvulsant, neuroprotective and antioxidant compounds. In this test, 50% animals were protected by 10 mg/kg MPPA, highlighting strong brain protective potential. In vitro, MPPA exhibited a superoxide-scavenging capacity about two-fold higher than that of α-asarone. Taken as a whole, present data support that MPPA is less toxic and more brain protective than α-asarone, and represents a worthy emerging neuroprotective/anticonvulsant compound endowed with a large activity spectrum including antioxidant, neuroprotective-like, moderate pro-GABAergic and sodium blockade mechanisms.

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