title: Mitogenic activity of pine cone extracts against cultured splenocytes from normal and tumor-bearing animals.
abstract: An acidic pine cone extract, Fr. V. of Pinus parviflora Sieb. et Zucc. significantly stimulated DNA synthesis of isolated splenocytes from both mice and rats, but only marginally affected the DNA synthesis of leukemic cell lines. The maximum stimulation level attained by Fr. V slightly exceeded that of plant lectins, whereas much weaker stimulating activity was found in natural and chemically modified antitumor polysaccharides, sialic acid-rich glycoproteins, and polyphenolic compounds such as lignin and tannic acid. In mice with subcutaneously transplanted sarcoma-180, responses of splenocytes against Con A declines in the terminal stage of tumor development, whereas responses against Fr. V remained relatively constant throughout all periods of tumor progression. The suppression of Fr. V activity by acetylation or methylation suggests the importance of the hydroxyl group in the expression of its stimulation activity.
authors.affiliation: Second Department of Biochemistry, School of Medicine, Showa University, Tokyo, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Kurakata
authors.forename: H
authors.initials: H
authors.lastname: Sakagami
authors.forename: M
authors.initials: M
authors.lastname: Takeda
authors.forename: K
authors.initials: K
authors.lastname: Konno
authors.forename: K
authors.initials: K
authors.lastname: Kitajima
authors.forename: S
authors.initials: S
authors.lastname: Ichikawa
authors.forename: N
authors.initials: N
authors.lastname: Hata
authors.forename: T
authors.initials: T
authors.lastname: Sato
mesh_terms: D000818:Animals; D002460:Cell Line; D002478:Cells, Cultured; D003208:Concanavalin A; D004261:DNA Replication / Q000187:drug effects; D005260:Female; D006801:Humans; D007938:Leukemia; D008213:Lymphocyte Activation; D008214:Lymphocytes / Q000187:drug effects / Q000276:immunology*; D051379:Mice; D008813:Mice, Inbred ICR; D008934:Mitogens; D010936:Plant Extracts / Q000494:pharmacology*; D037121:Plant Lectins; D051381:Rats; D012016:Reference Values; D012510:Sarcoma 180 / Q000276:immunology*; D013154:Spleen / Q000276:immunology; D014197:Trees
chemical_list: D008934:Mitogens; D010936:Plant Extracts; D037121:Plant Lectins; D003208:Concanavalin A