Summary
MIP-101 is a poorly differentiated human colon carcinoma cell line established from ascites that produces minimal amounts of carcinoembryonic antigen (CEA), a 180 kDa glycoprotein tumor marker, and nonspecific cross-reacting antigen (NCA), a related protein that has 50 and 90 kDa isoforms, in monolayer culture. However, MIP-101 produces CEA when implanted into the peritoneum of nude mice but not when implanted into subcutaneous tissue. We tested whether three-dimensional (3D) growth was a sufficient stimulus to produce CEA and NCA 50/90 in MIP-101 cells, because cells grow in 3D in vivo rather than in two-dimensions (2D) as occurs in monolayer cultures. To do this, MIP-101 cells were cultured on microcarrier beads in 3D cultures, either in static cultures as nonadherent aggregates or under dynamic conditions in a NASA-designed low shear stress bioreactor. MIP-101 cells proliferated well under all three conditions and increased CEA and NCA production three- to four-fold when grown in 3D cultures compared to MIP-101 cells growing logarithmically in monolayers. These results suggest that 3D growth in vitro simulates tumor function in vivo and that 3D growth by itself may enhance production of molecules that are associated with the metastatic process.
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Jessup, J.M., Brown, D., Fitzgerald, W. et al. Induction of carcinoembryonic antigen expression in a three-dimensional culture system. In Vitro Cell.Dev.Biol.-Animal 33, 352–357 (1997). https://doi.org/10.1007/s11626-997-0005-6
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DOI: https://doi.org/10.1007/s11626-997-0005-6