title: Structure activity relationship studies on antileishmanial steroidal alkaloids from Sarcococca hookeriana.
abstract: The search for antileishmanial constituents from the medicinal plant Sarcococca hookeriana (Buxaceae) of Nepalese origin has resulted in the isolation of 17 (1-17) active steroidal alkaloids. Compounds 1, 2, and 10 were subjected to derivatization and five chemically derived derivatives (1a, 2a, 10a, 10b, 10c) were also obtained. All these natural compounds and derivatives were found to have potent to mild antileishmanial properties. The IC(50) values were found to be in the range of 0.20-61.44 microg mL(-1) (IC(50) value of standard drug amphotericin B = 0.12 microg mL(-1)). The structure activity relationship indicated that the varieties of functionalities present in ring A of the steroidal alkaloids were found to play a characteristic role to increase the antileishmanial activity.
authors.affiliation: Institute of Forestry, Tribhuvan University, Pokhara, Nepal. devkotakpd@yahoo.com
authors.forename: Krishna P
authors.initials: KP
authors.lastname: Devkota
authors.forename: M Iqbal
authors.initials: MI
authors.lastname: Choudhary
authors.forename: Rosa
authors.initials: R
authors.lastname: Ranjit
authors.lastname: Samreen
authors.forename: Norbert
authors.initials: N
authors.lastname: Sewald
mesh_terms: D000470:Alkaloids / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology*; D000818:Animals; D000981:Antiprotozoal Agents / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology*; D031234:Buxaceae / Q000737:chemistry*; D020128:Inhibitory Concentration 50; D018320:Leishmania major / Q000187:drug effects* / Q000254:growth & development; D019906:Nuclear Magnetic Resonance, Biomolecular; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology; D016339:Spectrometry, Mass, Fast Atom Bombardment; D013256:Steroids / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology*; D013329:Structure-Activity Relationship
chemical_list: D000470:Alkaloids; D000981:Antiprotozoal Agents; D010936:Plant Extracts; D013256:Steroids