Volume 44, Issue 3, Pages (March 2006)

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Volume 44, Issue 3, Pages 560-567 (March 2006) Interaction of targeted liposomes with primary cultured hepatic stellate cells: Involvement of multiple receptor systems  Joanna E. Adrian, Klaas Poelstra, Gerrit L. Scherphof, Grietje Molema, Dirk K.F. Meijer, Catharina Reker-Smit, Henriëtte W.M. Morselt, Jan A.A.M. Kamps  Journal of Hepatology  Volume 44, Issue 3, Pages 560-567 (March 2006) DOI: 10.1016/j.jhep.2005.08.027 Copyright © 2005 European Association for the Study of the Liver Terms and Conditions

Fig. 1 Expression of M6P/IGF II receptors by HSC and LEC. mRNA expression of M6P/IGF II receptors by day-3 HSC, day-10 HSC and LEC was determined using RT-PCR with GAPDH as a house keeping gene (A). Protein expression of M6P/IGF II receptors by day-3 HSC (B), day-10 HSC (C) and LEC (D) was assessed by immunohistochemical staining for M6P/IGF II receptor. Red cells express M6P/IGF II receptors. At a protein level M6P/IGF II receptor expression could only be detected in day-10 HSC. Original magnification ×200. Journal of Hepatology 2006 44, 560-567DOI: (10.1016/j.jhep.2005.08.027) Copyright © 2005 European Association for the Study of the Liver Terms and Conditions

Fig. 2 Association of M6P-HSA liposomes with HSC. HSC 3 days (A) and 10 days (B) after isolation were incubated with 80, 160, 320nmol/ml 3H-COE labelled M6P-HSA liposomes (closed bars) and control liposomes (open bars). The association of control liposomes at the concentration 160nmol/ml was taken as 100%. Control values for day-3 HSC and day-10 HSC were 11.7±2.9 and 4.2±0.91nmol lipid per mg of cell protein, respectively. Data are presented as mean±SEM of 3–4 experiments. *P<0.05, **P<0.001 versus control liposomes. Journal of Hepatology 2006 44, 560-567DOI: (10.1016/j.jhep.2005.08.027) Copyright © 2005 European Association for the Study of the Liver Terms and Conditions

Fig. 3 Comparison of the association of M6P-HSA liposomes with day-3 and day-10 HSC. Cells were incubated with M6P-HSA liposomes at the concentration 160nmol/ml. Data are presented as mean±SEM of 3–4 experiments. Journal of Hepatology 2006 44, 560-567DOI: (10.1016/j.jhep.2005.08.027) Copyright © 2005 European Association for the Study of the Liver Terms and Conditions

Fig. 4 Effect of temperature and monensin on the association of M6P-HSA liposomes with HSC. Day-10 HSC were incubated with 3H-COE labelled M6P-HSA liposomes at 37°C or 4°C (A) and in the presence of monensin (2μM) (B). Association of M6P-HSA liposomes at 37°C or without treatment was taken as 100%. Control values for (A) and (B) were 17.6±2.7 and 15±2.5nmol lipid per mg cell protein, respectively, mean±SEM of 3–4 experiments. *P<0.05, **P<0.001 versus M6P-HSA liposomes at 37°C or without treatment. Journal of Hepatology 2006 44, 560-567DOI: (10.1016/j.jhep.2005.08.027) Copyright © 2005 European Association for the Study of the Liver Terms and Conditions

Fig. 5 Comparison of the association of M6P-HSA liposomes and AcoHSA liposomes with HSC and LEC. Day-3 HSC (A), day-10 (B) HSC and LEC (C) were incubated with 3H-COE labelled M6P-HSA liposomes (closed bars) and AcoHSA liposomes (open bars) in the absence or presence of 0.1mg/ml M6P-HSA, AcoHSA or 10μg/ml polyinosinic acid. The association of M6P-HSA liposomes and AcoHSA liposomes without treatment was taken as 100%. Control values of M6P-HSA liposomes for day-3 HSC, day-10 HSC and LEC were 56.5±14.9, 8.6±1.9 and 112.6±11.8nmol lipid per mg protein, respectively. Control values of AcoHSA liposomes for day-3 HSC, day-10 HSC and LEC were 41.6±9.4, 7.4±1.2 and 68.6±8.8nmol lipid per mg of cell protein, respectively, mean±SEM of 3–4 experiments. *P<0.05, **P<0.001 versus M6P-HSA liposomes without treatment, #P<0.05, ##P<0.001 versus AcoHSA liposomes without treatment. Journal of Hepatology 2006 44, 560-567DOI: (10.1016/j.jhep.2005.08.027) Copyright © 2005 European Association for the Study of the Liver Terms and Conditions

Fig. 6 Accumulation of M6P-HSA liposomes in HSC in the fibrotic liver. Double immunostaining using specific antibodies directed against HSA (red staining) to detect M6P-HSA liposomes and against desmin (blue staining) to identify HSC was performed as described in Materials and Methods. Arrows indicate double positive cells, (A) original magnification ×200, (B) original magnification ×1000 of the selected area from picture (A). Journal of Hepatology 2006 44, 560-567DOI: (10.1016/j.jhep.2005.08.027) Copyright © 2005 European Association for the Study of the Liver Terms and Conditions