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Title:  Method for preventing and/or treating renal disease

United States Patent:  6,306,827

Inventors:  Kinosaki; Masahiko (Tochigi, JP); Ogawa; Hiromi (Tochigi, JP); Masunaga; Hiroaki (Tochigi, JP); Kobayashi; Fumie (Tochigi, JP); Yamaguchi; Kyoji (Saitama, JP); Higashio; Kanji (Saitama, JP)

Assignee:  Snow Brand Milk Products Co., Ltd. (Hokkaido, JP)

Appl. No.:  194326

Filed:  November 24, 1998

PCT Filed:  March 20, 1998

PCT NO:  PCT/JP98/01221

371 Date:  November 24, 1998

102(e) Date:  November 24, 1998

PCT PUB.NO.:  WO98/43665

PCT PUB. Date:  October 8, 1998

Foreign Application Priority Data:  Mar 28, 1997[JP] (9-094989)


Abstract

A preventative and/or therapeutic agent to treat and/or prevent organ failure due to mercury exposure, contains as the active ingredient a mutant tumor cytotoxic factor protein (TCF-II). The therapeutic agent comprises a mutant TCF-II protein according to SEQ ID NO. 2 in which amino acid residues Arg-Lys-Arg-Arg have been replaced by Ala-Ala-Ala-Ala, or in which amino acids Lys-Ile-Lys-Thr-Lys-Lys have been replaced by Ala-Ile-Ala-Thr-Ala-Ala (SEQ ID NO. 3).

DISCLOSURE OF THE INVENTION

Considering the above situations, the present inventors eagerly investigated to look for an effective substance for these renal diseases and found that TCF-II mutant, especially, a TCF-II mutant which is a point mutant of amino acid sequence at the second from N-terminal, that is, from Arg-Lys-Arg-Arg to Ala-Ala-Ala-Ala or another TCF-II mutant whose amino acid sequence at 27 th from N-terminal was changed into Ala-Ile-Ala-Thr-Ala-Ala from Lys-Ile-Lys-Thr-Lys-Lys, was effective for preventing and/or treating renal diseases. Accordingly, an object of the present invention is to provide a novel agent for preventing and/or treating renal diseases comprising TCF-II mutant as an effective ingredient.

The present invention relates to an agent for preventing and/or treating renal diseases comprising TCF-II mutant, especially, a TCF-II mutant, such as the one disclosed in SEQ ID NO:2, which is a point mutant of amino acid sequence at the second from N-terminal, that is, from Arg-Lys-Arg-Arg to Ala-Ala-Ala-Ala or another TCF-II mutant such as the one disclosed in SEQ ID NO:3, whose amino acid sequence at 27 th from N-terminal was changed to Ala-Ile-Ala-Thr-Ala-Ala from Lys-Ile-Lys-Thr-Lys-Lys, as an effective ingredient. The agent for preventing and/or treating renal disease of the present invention is useful for preventing and/or treating renal diseases such as chronic nephropathy related with ischemic renal disorder, drug-induced renal disorder, diabetic nephropathy, glomerular nephropathy, glomerulosclerosis, membranous nephropathy, autoimmune disease and nephrose or renal insufficiency caused by the above.

Point mutant TCF-II of an effective ingredient of the present invention can be prepared by synthesizing oligonucleotide substituted with corresponding base sequence to mutation site of TCF-II mutant, followed by site-directed mutagenesis using TCF-II cDNA as a template by polymerase chain reaction (PCR) method. cDNA obtained as above can be inserted into a vector having an appropriate expression promoter (Cytomegalovirus (CMV), SR.alpha. (Mol. Cell. Biol. vol.8, No.1 pp466-472(1988)) and Japanese unexamined laid-open patent application No.277489(1991)), followed by transfection thereof into eukariotic cell such as mammlian cell. TCF-II mutant desired can be prepared by recovering it from culture medium of the culture of the above transfected cell. As TCF-II mutant used in the present invention, any TCF-II with an artificial mutation can be used but, more preferably, a TCF-II mutant such as the one disclosed in SEQ ID NO:2, whose amino acid sequence at the second from N-terminal, was changed from Arg-Lys-Arg-Arg to Ala-Ala-Ala-Ala or another TCF-II mutant such as the one disclosed in SEQ ID NO:3, whose amino acid sequence at 27th from N-terminal was changed to Ala-Ile-Ala-Thr-Ala-Ala from Lys-Ile-Lys-Thr-Lys-Lys(these mutants were described in WO 96/20214) can be used.

The agent for preventing and/or treating renal diseases of the present invention can be administered intravenously, intra muscularly or subcutaneously as injections. This pharmaceutical preparation can be manufactured according to a known method of manufacturing pharmaceutical preparation and, if necessary, a pH conditioner, buffer, stabilizer etc. can be added thereto. Dose of the pharmaceutical preparation of the present invention can vary depending on degree of severeness of symptom, health conditions, age, body weight and will not be limited, but for an adult person per day pharmaceutical preparation containing 0.6 mg-600 mg of TCF-II, preferably 6 mg-60 mg, can be administered once or more per day.

Claim 1 of 5 Claims

What is claimed is:

1. A method of treating renal failure due to mercury exposure, comprising:

administering to a patient who has been exposed to mercury, an effective amount of a pharmaceutical preparation comprising a mutant TCF-II protein according to SEQ ID NO. 2 in which amino acid residues Arg-Lys-Arg-Arg have been replaced by Ala-Ala-Ala-Ala, or a pharmacologically acceptable salt thereof.

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