Patents by Inventor Masahiko Isaka

Masahiko Isaka has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Antituberculosis compounds, Hirsutellones A, B, and C
    Patent number: 7414069
    Abstract: Three new alkaloids, Hirsutellones A, B, and C, are produced in cultures of fungus such as Hirsutella nivea strain BCC 2594 and Trichoderma sp. strain BCC 7579. The Hirsutellones exhibited potent growth inhibitory activity against Mycobacterium tuberculosis (H37Ra strain) with an MIC value of 0.78 ?g/ml, while showing weak or no cytotoxicity to mammalian cells. Therefore, Hirsutellones and pharmaceutical compositions containing Hirsutellones may be useful for the treatment of tuberculosis. Also described herein are methods of isolating the Hirsutellones.
    Type: Grant
    Filed: November 21, 2005
    Date of Patent: August 19, 2008
    Assignee: National Center for Genetic Engineering & Biotechnology, National Science & Technology Development Agency
    Inventors: Masahiko Isaka, Nigel Leslie Hywel-Jones, Sayanh Somrithipol, Kanyawim Kirtikara, Prasit Palittapongarnpim, Yodhathai Thebtaranonth
  • Novel antituberculosis compounds, Hirsutellones A, B, and C
    Publication number: 20060122252
    Abstract: Three new alkaloids, Hirsutellones A, B, and C, are produced in cultures of fungus such as Hirsutella nivea strain BCC 2594 and Trichoderma sp. strain BCC 7579. The Hirsutellones exhibited potent growth inhibitory activity against Mycobacterium tuberculosis (H37Ra strain) with an MIC value of 0.78 ?g/ml, while showing weak or no cytotoxicity to mammalian cells. Therefore, Hirsutellones and pharmaceutical compositions containing Hirsutellones may be useful for the treatment of tuberculosis. Also described herein are methods of isolating the Hirsutellones.
    Type: Application
    Filed: November 21, 2005
    Publication date: June 8, 2006
    Inventors: Masahiko Isaka, Nigel Hywel-Jones, Sayanh Somrithipol, Kanyawim Kirtikara, Prasit Palittapongarnpim, Yodhathai Thebtaranonth
  • Quinuclidine derivative having tricyclic hetero condensed ring
    Patent number: 5830902
    Abstract: A quinuclidine derivative represented by the following general formula (I), a pharmaceutically acceptable salt thereof, a hydrate thereof or a solvate thereof, which has strong squalene synthase inhibiting activity and is useful as a cholesterol lowering agent without causing side effects. ##STR1## (Symbols in the formula represent the following meanings; R.sub.1 : a hydrogen atom, a halogen atom or a lower alkyl group,R.sub.2 : a hydrogen atom, a hydroxyl group or a lower alkoxy group,. . : a single bond or a double bond, with the proviso thatR.sub.2 does not exist when . . . is a double bond,X and Y: the same or different from each other and each represents a bond, an oxygen atom (--O--), a carbonyl group (--CO--), a group represented by the formula --S(O).sub.p -- or a group represented by the formula --NR.sub.3 --,p: 0, 1 or 2,R.sub.3 : a hydrogen atom or a lower alkyl group which may have a substituent,A: a saturated or unsaturated lower alkylene group, a group of the formula --(CH.sub.2).sub.m Z(CH.sub.
    Type: Grant
    Filed: August 21, 1997
    Date of Patent: November 3, 1998
    Assignee: Yamanouchi Pharmaceutical Co., Ltd.
    Inventors: Masahiko Isaka, Tsukasa Ishihara, Koyo Matsuda, Hirotoshi Kakuta, Hiroshi Moritani