People have published intraperitoneal injections and dissolved with help of DMSO. I believe it should work for every organ, there are two back references in this paper also saying the same.
TGF-β Small Molecule Inhibitor SB431542 Reduces Rotator Cuff Muscle Fibrosis and FattyInfiltration By Promoting Fibro/Adipogenic Progenitor Apoptosis.
Davies MR, Liu X, Lee L, Laron D, Ning AY, Kim HT, Feeley BT.
PLoS One. 2016 May 17;11(5):e0155486. doi: 10.1371/journal.pone.0155486. eCollection 2016.