The inventors explored the relevance of alpelisib in the MRL / MpJ-Faslpr / J mouse (referred to herein as MRL-lpr), a mouse model of
lupus nephritis. MRL-lpr mice treated with alpelisib showed less
proteinuria compared to vehicle. Even more strikingly, a reverse trajectory was shown by comparison of
albuminuria before and
after treatment initiation. Indeed, MRL-lpr mice treated with alpelisib showed improvement in
proteinuria arguing for reversibility of the
disease. At the time of euthanasia, MRL-lpr mice treated with alpelisib tended to have a lower
kidney-to-
body weight ratio compared to vehicle-treated animals.
Kidney examination showed that alpelisib was associated with the absence of glomerular lesions and improved
kidney function compared to vehicle-treated mice. The inventors concluded that alpelisib and more generally PIK3CA inhibition represent a promising
drug for patients with proliferative
glomerulonephritis. The present invention relates to a method for treating proliferative
glomerulonephritis in a subject in need thereof, comprising the step of administering to the subject a therapeutically effective amount of a PIK3CA inhibitor.