title: Antitumor activity of tumor necrosis factor-alpha conjugated with polyvinylpyrrolidone on solid tumors in mice.
abstract: We attempted the development of a novel polymer conjugation to further improve the therapeutic potency of antitumor cytokines compared with PEGylation for clinical application. Compared with native tumor necrosis factor (TNF)-alpha in vitro, specific bioactivities of polyvinyl-pyrrolidone (PVP)-modified TNF-alphas (PVP-TNF-alphas) were decreased by increasing the degree of PVP attachment. PVP-TNF-alpha fraction 3, Mr 101,000, had the most effective antitumor activity of the various PVP-TNF-alphas in vivo. PVP-TNF-alpha fraction 3 had >200-fold higher antitumor effect than native TNF-alpha, and the antitumor activity of PVP-TNF-alpha fraction 3 was >2-fold higher than that of MPEG-TNF-alpha (Mr 108,000), which had the highest antitumor activity among the polyethylene glycol (PEG)-conjugated TNF-alphas. Additionally, a high dose of native TNF-alpha induced toxic side effects such as body weight reduction, piloerection. and tissue inflammation, whereas no side effects were observed after i.v. administration of PVP-TNF-alpha fraction 3. The plasma half-life of PVP-TNF-alpha fraction 3 (360 min) was about 80- and 3-fold longer than those of native TNF-alpha (4.6 mm) and MPEG-TNF-alpha (122 min), respectively. The mechanism of increased antitumor effect in vivo caused the prolongation of plasma half-life and increase in stability. These results suggested that PVP is a useful polymeric modifier for bioconjugation of TNF-alpha to increase its antitumor potency, and multifunctionally bioconjugated TNF-alpha may be a potentiated antitumor agent for clinical use.
authors: Faculty of Pharmaceutical Sciences, Osaka University, Japan.
authors: H
authors: H
authors: Kamada
authors: Y
authors: Y
authors: Tsutsumi
authors: Y
authors: Y
authors: Yamamoto
authors: T
authors: T
authors: Kihira
authors: Y
authors: Y
authors: Kaneda
authors: Y
authors: Y
authors: Mu
authors: H
authors: H
authors: Kodaira
authors: S I
authors: SI
authors: Tsunoda
authors: S
authors: S
authors: Nakagawa
authors: T
authors: T
authors: Mayumi
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000008:administration & dosage* / Q000737:chemistry / Q000493:pharmacokinetics; D004337:Drug Carriers; D005260:Female; D005354:Fibrosarcoma / Q000188:drug therapy / Q000378:metabolism; D006801:Humans; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D009368:Neoplasm Transplantation; D010592:Pharmaceutic Aids / Q000008:administration & dosage* / Q000737:chemistry / Q000493:pharmacokinetics; D011092:Polyethylene Glycols / Q000008:administration & dosage / Q000737:chemistry / Q000493:pharmacokinetics; D011205:Povidone / Q000008:administration & dosage* / Q000737:chemistry / Q000493:pharmacokinetics; D012510:Sarcoma 180 / Q000188:drug therapy / Q000378:metabolism; D014409:Tumor Necrosis Factor-alpha / Q000008:administration & dosage* / Q000737:chemistry / Q000493:pharmacokinetics
chemical_list: D000970:Antineoplastic Agents; D004337:Drug Carriers; D010592:Pharmaceutic Aids; D014409:Tumor Necrosis Factor-alpha; D011092:Polyethylene Glycols; D011205:Povidone