I have been trying various protocols, I was successful at isolating cells from tissue via both explant and enzymatic method, however after some days the cells are becoming stagnant and are not proliferating despite numerous attempts of increase FBS. I have maintained two batches for a month each but cells were dieing after some time. The media used was alpha mem in one and dmem high glucose in another and the pH of both were 7.2-7.4. Please may you help me with the isolation technique?