title: Cycloartane saponins from Astragalus peregrinus as modulators of lymphocyte proliferation.
abstract: From Astragalus peregrinus, four cycloartane-type saponins have been isolated and their structures elucidated by spectral means as 20(R),24(S)-epoxy-9 beta,19-cyclolanostane-3 beta,6 alpha,16 beta,25-tetrol 3-O-beta-D-glucopyranoside (1), 20(R),24(S)-epoxy-9 beta,19-cyclolanostane-3 beta,6 alpha,16 beta,25-tetrol 3-O-alpha-L-rhamnopyranosyl-(1-->4)-beta-D-glucopyranoside (2), 20(R),24(S)-epoxy-9 beta,19-cyclolanostane-3 beta,6 alpha,16 beta,25-tetrol 3-O-alpha-L-rhamnopyranosyl-(1-->2)-beta-D-glucopyranoside (3) and 20(R),25-epoxy-9 beta,19-cyclolanostane-3 beta,6 alpha,16 beta,24(S)-tetrol (24-O-acetyl)- 3-O-alpha-L-rhamnopyranosyl-(1-->2)-(6'-O-acetyl)-beta-D-glucopyranoside (4). Compounds 2 and 3 showed to stimulate the proliferation of mouse splenocytes and were not significantly cytotoxic.
authors.affiliation: Dipartimento di Chimica Organica e Industriale, Università degli Studi di Milano, via Venezian 21, 20133 Milano, Italy. luisella.verotta@unimi.it
authors.forename: L
authors.initials: L
authors.lastname: Verotta
authors.forename: M
authors.initials: M
authors.lastname: Guerrini
authors.forename: N A
authors.initials: NA
authors.lastname: El-Sebakhy
authors.forename: A M
authors.initials: AM
authors.lastname: Asaad
authors.forename: S M
authors.initials: SM
authors.lastname: Toaima
authors.forename: M E
authors.initials: ME
authors.lastname: Abou-Sheer
authors.forename: Y D
authors.initials: YD
authors.lastname: Luo
authors.forename: J M
authors.initials: JM
authors.lastname: Pezzuto
mesh_terms: D000276:Adjuvants, Immunologic / Q000494:pharmacology* / Q000627:therapeutic use; D000818:Animals; D007887:Fabaceae; D005260:Female; D006801:Humans; D008214:Lymphocytes / Q000187:drug effects*; D051379:Mice; D008815:Mice, Inbred Strains; D008517:Phytotherapy; D010936:Plant Extracts / Q000494:pharmacology* / Q000627:therapeutic use; D018514:Plant Structures; D012503:Saponins / Q000494:pharmacology* / Q000627:therapeutic use; D013154:Spleen / Q000166:cytology / Q000187:drug effects; D014407:Tumor Cells, Cultured / Q000187:drug effects
chemical_list: D000276:Adjuvants, Immunologic; D010936:Plant Extracts; D012503:Saponins