Abstract: Compositions and methods are provided for the treatment and diagnosis of diseases amenable to modulation of the synthesis or metabolism of arachidonic acid and related compounds. In accordance with preferred embodiments, oligonucleotides and oligonucleotide analogs are provided which are specifically hybridizable with nucleic acids encoding 5-lipoxygenase, 5-lipoxygenase activating proteins, LTA.sub.4 hydrolase, phospholipase A.sub.2, phospholipase C, and coenzyme A-independent transacylase. The oligonucleotide comprises nucleotide units sufficient in identity and number to effect said specific hybridization. In other preferred embodiments, the oligonucleotides are specifically hybridizable with a transcription initiation site, a translation initiation site, and intron/exon junction.

Abstract: Compositions and methods are provided for the treatment and diagnosis of diseases or conditions amenable to treatment through modulation of the synthesis or metabolism of multidrug resistance-associated protein (MRP). In accordance with preferred embodiments, oligonucleotides are provided which are specifically hybridizable with nucleic acids encoding multidrug resistance-associated protein (MRP). Methods of treating animals suffering from diseases or conditions amenable to therapeutic intervention by modulating multidrug resistance with an oligonucleotides specifically hybridizable with RNA or DNA corresponding to multidrug resistance-associated protein (MRP) are disclosed. Methods of preventing the development of multidrug resistance and of improving the efficacy of chemotherapy are also-disclosed.