A bioreactor for cell culture includes a chamber having three channels therethrough for conducting fluids, the three channels including an upper channel, a middle channel, and a lower channel, each the channel having an inlet and an outlet approximately opposite along the channel from the inlet. First and second cell support scaffolds are positioned within the chamber, each scaffold comprising at least one three-dimensional porous matrix containing non woven fibrous polyethylene terephthalate, the first scaffold being positioned within the chamber between the upper channel and the middle channel, and the second scaffold being positioned within the chamber between the middle channel and the lower channel.