TY - JOUR
T1 - Rapid, large-scale formation of porcine hepatocyte spheroids in a novel spheroid reservoir bioartificial liver
AU - Nyberg, Scott L.
AU - Hardin, Joseph
AU - Amiot, Bruce
AU - Argikar, Upendra A.
AU - Remmel, Rory P.
AU - Rinaldo, Piero
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2005/8
Y1 - 2005/8
N2 - We have developed a novel bioreactor based on the observation that isolated porcine hepatocytes rapidly and spontaneously aggregate into spheroids under oscillation conditions. The purpose of this study was to characterize the influence of oscillation frequency (0.125 Hz, 0.25 Hz), cell density (1-10 × 106 cells/mL), and storage condition (fresh, cryopreserved) of porcine hepatocytes on the kinetics of spheroid formation. The viability and metabolic performance of spheroid hepatocytes was also compared to monolayer culture. We observed that both fresh and cryopreserved porcine hepatocytes began formation of spheroids spontaneously at the onset of oscillation culture. Spheroid size was directly related to cell density and time in culture, though inversely related to oscillatory frequency. Spheroid formation by fresh porcine hepatocytes was associated with decreased cell death (lactate dehydrogenase release, 1.3 ± 1.0 vs. 3.1 ± 0.7 U/mL, P < 0.05) and increased metabolic performance (albumin production, 14.7 ± 3.3 vs. 4.6 ± 1.4 fg/c/h, P < 0.0001; ureagenesis from ammonia, 267 ± 63 vs. 92 ± 13 μmol/L/h, P < 0.001) compared with monolayer culture. In conclusion, based on the favorable properties of rapid spheroid formation, increased hepatocellular function, and ease of scale-up, the spheroid reservoir bioreactor warrants further investigation as a bioartificial liver for support of liver failure.
AB - We have developed a novel bioreactor based on the observation that isolated porcine hepatocytes rapidly and spontaneously aggregate into spheroids under oscillation conditions. The purpose of this study was to characterize the influence of oscillation frequency (0.125 Hz, 0.25 Hz), cell density (1-10 × 106 cells/mL), and storage condition (fresh, cryopreserved) of porcine hepatocytes on the kinetics of spheroid formation. The viability and metabolic performance of spheroid hepatocytes was also compared to monolayer culture. We observed that both fresh and cryopreserved porcine hepatocytes began formation of spheroids spontaneously at the onset of oscillation culture. Spheroid size was directly related to cell density and time in culture, though inversely related to oscillatory frequency. Spheroid formation by fresh porcine hepatocytes was associated with decreased cell death (lactate dehydrogenase release, 1.3 ± 1.0 vs. 3.1 ± 0.7 U/mL, P < 0.05) and increased metabolic performance (albumin production, 14.7 ± 3.3 vs. 4.6 ± 1.4 fg/c/h, P < 0.0001; ureagenesis from ammonia, 267 ± 63 vs. 92 ± 13 μmol/L/h, P < 0.001) compared with monolayer culture. In conclusion, based on the favorable properties of rapid spheroid formation, increased hepatocellular function, and ease of scale-up, the spheroid reservoir bioreactor warrants further investigation as a bioartificial liver for support of liver failure.
UR - http://www.scopus.com/inward/record.url?scp=23744479804&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=23744479804&partnerID=8YFLogxK
U2 - 10.1002/lt.20446
DO - 10.1002/lt.20446
M3 - Article
C2 - 16035089
AN - SCOPUS:23744479804
SN - 1527-6465
VL - 11
SP - 901
EP - 910
JO - Liver Transplantation
JF - Liver Transplantation
IS - 8
ER -