l-Naproxen ((R)-Naproxen) is an enantiomer of (S)-Naproxen. l-Naproxen can inhibit Cdc42 and Rac1 (EC50=96 μM and 212 μM, respectively), and show anti-tumor activity[1][2][3].
l-Naproxen (30-1000 μM; 2 h) inhibits Rac1 and Cdc42 activity selectively in cells[3].l-Naproxen (0-300 μM; 48 h) inhibits migration of immortalized human ovarian cancer cells[3].l-Naproxen (300 μM; 48 h) shows activity via a COX-independent mechanism[3].
[1]. Sonika Batra, et al. Enantiomeric Resolution of (RS)-Naproxen and Application of (S)- Naproxen in the Direct and Indirect Enantioseparation of Racemic Compounds by Liquid Chromatography: A Review. Curr Med Chem. 2017;24(8):758-780.
[2]. M Iwaki, et al. Stereoselective disposition of naproxen glucuronide in the rat. Drug Metab Dispos. 1995 Oct;23(10):1099-103.
[3]. Tudor I Oprea, et al. Novel Activities of Select NSAID R-Enantiomers against Rac1 and Cdc42 GTPases. PLoS One. 2015 Nov 11;10(11):e0142182.