Pharmaceutical compositions and uses of inorganic pyrophosphates

Pharmaceutical compositions comprising an inorganic pyrophosphate (PPi) in a form that renders the PPi accessible to ABC proteins when administered to a subject in vivo, as well as use of the compositions for treating subjects having a disease or disorder associated with inappropriate or inadequate ABC protein activity (e.g., cystic fibrosis, multi drug resistance, Zellweger's Syndrome) is disclosed.