Alkoxypsoralens, Novel Nonpeptide Blockers of Shaker-Type K+ Channels: Synthesis and Photoreactivity
摘要:
A series of psoralens and structurally related 5,7-disubstituted coumarins was synthesized and investigated for their K+ channel blocking activity as well as for their phototoxicity to Artemia salina and their ability to generate singlet oxygen and to photomodify DNA. After screening the compounds on Ranvier nodes of the toad Xenopus Laevis, the affinities of the most promising compounds, which proved to be psoralens bearing alkoxy substituents in the 5-position or alkoxymethyl substituents in the neighboring 4- or 4'-position, to a number of homomeric K+ channels were characterized. All compounds exhibited the highest affinity to Kv1.2. 5,8-Diethoxypsoralen (10d) was found to be an equally potent inhibitor of Kv1.2 and Kv1.3, while lacking the phototoxicity normally inherent in psoralens. The reported compounds represent a novel series of nonpeptide blockers of Shaker-type K+ channels that could be further developed into selective inhibitors of Kv1.2 or Kv1.3.
New psoralen compounds have been synthesized. The compounds all include the addition of substituent groups at the 4' position on the basic trioxsalen structure. Specifically, the compounds have the structure: ##STR1## wherein X may be any desired substituent such as halogenated alkyls, alcohols, ethers, aminoalkyls, etc. The new substituted psoralens exhibit high solubility in aqueous solution and low dissociation constants from deoxyribonucleic acid (DNA), as well as a reactivity with ribonucleic acids (RNA). Such psoralen compounds find use in the study of secondary structures of nucleic acids; as inhibitors of RNA replication; in the inactivation of viruses; and in the photo chemotherapy of psoriasis.
Chloroquine coupled nucleic acids and methods for their synthesis
申请人:Kosak M. Kenneth
公开号:US20060040879A1
公开(公告)日:2006-02-23
This invention discloses compositions and methods for preparing chloroquine-coupled nucleic acid compositions. The prior art has shown that chloroquines given as free drug in high enough concentration, enhances the release of various agents from cellular endosomes into the cytoplasm. The purpose of these compositions is to provide a controlled amount of chloroquine at the same site where the nucleic acid needs to be released, thereby reducing the overall dosage needed. The compositions comprise a chloroquine substance coupled to a nucleic acid directly or through a variety of pharmaceutical carrier substances. The carrier substances include polysaccharides, synthetic polymers, proteins, micelles and other substances for carrying and releasing the chloroquine compositions in the body for therapeutic effect. The compositions can also include a biocleavable linkage for carrying and releasing nucleic acids for therapeutic or other medical uses. The invention also discloses nucleic acid carrier compositions that are coupled to targeting molecules for targeting the delivery of nucleic acids to their site of action.
Inactivated target cells, methods of using same and vaccines and diagnostic kits containing same
申请人:Kronenberg, Lee H.
公开号:EP0066886A2
公开(公告)日:1982-12-15
The present invention describes the inactivation of target cells by treatment of said cells with psoralens and irradiation with long wave length ultraviolet light. The inactivated cells are shown to be antigenic and are shown to be non-infective. These cells are useful as target antigens for in vitro assays of cellular immunity. Diagnostic kits containing the inactivated, target cells are prepared for use in serologic assays. Since the inactivated cells are immunogenic and non-infective, they are also useful as vaccines.
Photochemical decontamination treatment of whole blood or blood components
申请人:DIAMOND SCIENTIFIC CO.
公开号:EP0124363A2
公开(公告)日:1984-11-07
Biological compositions are freed of functional polynucleotides by treatment of the biological composition with psoralen derivatives under irradiation conditions in which the proteins retain their original physiological activities and any polynucleotide present is rendered inactive.
A vaccine composition for animals susceptible to infection by canine distemper virus is disclosed. The vaccine comprises an immunologically effective amount of an inactivated canine distemper virus in combination with a non-toxic pharmaceutically acceptable immunologic adjuvant, inactivation of the canine distemper virus being effected by exposure of the virus to long wavelength ultraviolet light ultraviolet radiation or gamma radiation in the presence of a furocoumarin.