The effects of KNK437, a novel inhibitor of heat shock protein synthesis, on the acquisition of thermotolerance in a murine transplantable tumor in vivo.

Abstract	A newly synthesized reagent, KNK437, has been found specifically to inhibit the synthesis of heat shock proteins in vitro. In this study, we investigated the effects of KNK437 on the synthesis of heat shock proteins and the induction of thermotolerance in transplantable tumors in vivo. SCC VII cells were grown in vivo and transplanted into C3H/He mice. The concentrations of KNK437 in the tumors and the sera of the mice were examined by high-performance liquid chromatography. Hsp72 synthesis was examined by Western immunoblot analysis. The response to hyperthermia was evaluated in terms of the delay in tumor growth. KNK437 had low toxicity in vivo. The concentration of KNK437 in the tumors gradually increased and reached a peak 6 h after i.p. injection. Hsp72 were synthesized 8 h after hyperthermia at 44 degrees C for 10 min, and their synthesis was inhibited by administration of KNK437 6 h before hyperthermia. At a concentration of 200 mg/kg, KNK437 alone showed no antitumor effects and did not increase the thermosensitivity of nontolerant tumors. The same dose of KNK437 enhanced the antitumor effects of fractionated heat treatment at 44 degrees C in a synergistic manner. This study strongly suggests the inhibition of thermotolerance via the inhibition of HSP72 in vivo. The inhibition of thermotolerance by KNK437 may help to improve the efficacy of clinical fractionated hyperthermia.
Authors	M Koishi, S Yokota, T Mae, Y Nishimura, S Kanamori, N Horii, K Shibuya, K Sasai, M Hiraoka
Journal	Clinical cancer research : an official journal of the American Association for Cancer Research (Clin Cancer Res) Vol. 7 Issue 1 Pg. 215-9 (Jan 2001) ISSN: 1078-0432 [Print] United States
PMID	11205912 (Publication Type: Journal Article)
Chemical References	Benzhydryl Compounds Heat-Shock Proteins KNK 437 Pyrrolidinones
Topics	Animals Benzhydryl Compounds (chemistry, pharmacology) Cell Division (drug effects) Chromatography, High Pressure Liquid Electrophoresis, Polyacrylamide Gel Fever Heat-Shock Proteins (antagonists & inhibitors, metabolism) Humans Immunoblotting Injections, Subcutaneous Male Mice Mice, Inbred C3H Mice, Inbred ICR Molecular Structure Neoplasm Transplantation Pyrrolidinones (chemistry, pharmacology) Temperature Tumor Cells, Cultured (drug effects)

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