In Vivo Antimalarial Activity of the 80% Methanolic Root Bark Extract and Solvent Fractions of Gardenia ternifolia Schumach. & Thonn. (Rubiaceae) against Plasmodium berghei

Background. Evolution of antimalarial drug resistance makes the development of new drugs a necessity. Important source in search of such drugs is medicinal plants. Gardenia ternifolia plant is used in Ethiopian traditional medicine for the treatment of malaria and is endowed with in vitro antimalarial activity. Herein, the in vivo antimalarial activity of the plant was investigated. Methods. Acute toxicity was carried out using a standard procedure. A 4-day suppressive test was employed to evaluate the antimalarial effect of methanolic crude extract and solvent fractions of the plant. The curative and prophylactic effect of crude extract was further tested by Ranes's test and residual infection procedure, respectively, using Plasmodium berghei (ANKA strain) in Swiss albino mice. Results. The chemosuppressive effect exerted by the crude extract and fractions ranged between 30-59% and 14-51%, respectively. Curative and prophylactic effects of the crude extract were in the range of 36-63% and 24-37%, respectively. All dose levels of the crude extract prevented loss of weight, reduction in temperature, and anemia on early and established infection. Butanol and chloroform fractions also did reverse reduction in temperature, body weight, and packed cell volume. Conclusions. The results indicated that the plant has a promising antiplasmodial activity and it could be considered as a potential source to develop new antimalarial agents.