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An extract of seeds fromAeginetia indica L., a parasitic plant,induces potent antigen-specific antitumor immunity in Meth A-bearing BALB/c mice
Authors:Jian-Guo Chai  Takashi Bando  Satoshi Kobashi  Mikio Oka  Hideyuki Nagasawa  Shoji Nakai  Ken-ichi Maeda  Kunisuke Himeno  Mitsunobu Sato  Shinya Ohkubo
Institution:(1) Department of Parasitology and Immunology, School of Medicine, The University of Tokushima, Tokushima, Japan;(2) Second Department of Oral and Maxillofacial Surgery, School of Dentistry, The University of Tokushima, Tokushima, Japan;(3) Ohkubo Hospital, Tokushima, Japan
Abstract:Summary The antitumor activity of an extract of seeds fromAeginetia indica L., a parasitic plant, was investigated. BALB/c mice, inoculated i.p. 1 × 105 syngeneic Meth A tumor cells, were administered 2.5 mg/kgA. indica extract i.p. every 2 days from day 0. The untreated mice died of an ascitic form of tumor growth within 21 days, whereas all the treated mice completely recovered from tumor challenge without any side-effects. The extract did not exert direct cytotoxic activity against Meth A in vitro. Mice that survived after the first challenge as a result ofA. indica treatment overcame the rechallenge with homologous Meth A without additional administration of the extract. On the other hand, those mice could not survive after rechallenge with Meth 1 tumor cells, which were also established in BALB/c mice but were different in antigenicity from Meth A, suggesting the development of antigen-specific concomitant immunity in theA. indica-cured mice. In the induction phase of antitumor resistance in this system, CD4+ T cells appeared to be the main contributors, since in vivo administration of anti-CD4 mAb completely abolished such resistance. In contrast, anti-CD8 mAb administration did not influence the effect ofA. indica. The importance of CD4+ T cells in antitumor immunity was again clarified by Winn assay; that is, spleen and lymph node cells depleted of CD4+ T cells in vitro prior to assay abolished antitumor activity on co-grafted Meth A tumor cells in vivo.
Keywords:Aeginetia indica L    Meth A tumor  CD4+ T cells
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