title: Extraction and purification of a substance with luteinizing hormone releasing activity from the leaves of Avena sativa.
abstract: Attempts were made to purify the LH-releasing substance extracted from the leaves of Avena sativa by means of two-step chromatographic procedures using a weakly acidic ion-exchange resin (CG-50,type II) and DEAE-Sephadex A-25 (coarse) with successful results. For preliminary fractionation of such starting materials as dried leaves, fresh leaves, and acetone-extracted powder(crude extracts), 5% acetate-buffered active carbon proved to be more effective than starch zone electrophoresis. From its behavior on chromatography with weakly acidic ion-exchange resins as well as Sephadex gel filtration, the active fraction extracted from the leaves of Avena saliva was assumed to be different from the LH-RH present in the hypothalamus. This partially purified material, however, was demonstrated to have an LH-releasing activity by the ovarian ascorbic acid depletion method using Wistar-Imamichi strain rats. Evidence was presented that its site of action is in the adenohypophysis.
mesh_terms: D000818:Animals; D002848:Chromatography, DEAE-Cellulose; D002850:Chromatography, Gel; D002852:Chromatography, Ion Exchange; D002855:Chromatography, Thin Layer; D002523:Edible Grain; D005260:Female; D007987:Gonadotropin-Releasing Hormone / Q000302:isolation & purification*; D008297:Male; D010936:Plant Extracts / Q000032:analysis; D010944:Plants / Q000032:analysis*; D051381:Rats
chemical_list: D010936:Plant Extracts; D007987:Gonadotropin-Releasing Hormone