For purified SECs, internalization experiments in started immediately after the 2-h adhesion and recovery period following plating on fibronectin-coated dishes. and LMWH in the blood are 1 h and 2C6 h, respectively. In this study, we demonstrate that anti-HARE antibodies specifically block the uptake of LMWH and UFH by isolated rat liver SECs and by human 293 cells expressing recombinant human HARE (hHARE). hHARE has a significant affinity (is usually DMEM made up of 0.05% BSA (without serum), and is RPMI containing 0.15% BSA (without serum). The perfusion buffers are made up of 142 mM NaCl, 6.7 mM KCl, 10.0 mM HEPES, pH 7.4; made up of 67.0 mM NaCl, 6.7 mM KCl, 4.8 mM CaCl22H2O, 101 mM HEPES, pH 7.2; and contains 137.0 mM NaCl, 4.7 mM KCl, 1 mM MgSO4, 1.2 mM CaCl22H2O, 10.0 mM HEPES, pH NU6300 7.4. BSA if present is at 15 g/l. Size exclusion chromatography and MALLS analysis. Weight-average molar mass values for the heparin preparations used were determined by size exclusion chromatography coupled to multiangle laser light scattering (MALLS) as described previously (2). Analyses of 0.2 ml samples (at 2.0 mg/ml heparin NU6300 in PBS) were performed with PL Aquagel-OH60 and Aquagel-OH30 columns in series at a Rabbit Polyclonal to DP-1 flow rate of 0.4C0.5 ml/min in 50 mM NaPO4, pH 7.0, 150 mM NaCl, 0.05% NaN3 at 22C. MALLS analysis was performed constantly around the eluate by use of a DAWN DSP laser photometer in series with NU6300 an OPTILAB DSP interferometric refractometer (Wyatt Technologies). Isolation of SECs from perfused rat liver. Animal procedures were performed under Institutional Animal Care and Use Committee protocol 08-073 approved by the University of Oklahoma Health Sciences Center and are within the guidelines set by the Association for Assessment and Accreditation of Laboratory Animal Care. SECs were prepared by the liver collagenase perfusion technique of Seglen (40) with minor modifications (6, 32) and purified by using discontinuous Percoll gradients (42). Briefly, Sprague-Dawley rats (200C400 g, Charles River Laboratories) were anesthetized with 11 ml of 25% isoflurane in polyethylene glycol in a glass chamber, placed on a tray face up with a nose cone made up of 25% isoflurane and stimulated with 70% ethanol around the abdomen to confirm deep anesthesia. The entire abdominal cavity was uncovered and the portal vein was cannulated with an Insyte Autoguard catheter (18 GA, 1.3 30 mm, Becton, Dickinson Infusion Therapy Systems) and secured with two loops of surgical silk string. As soon as the catheter was immobilized, other major blood vessels were severed and TBS was flushed (50 ml/min) through the NU6300 liver for 10 min to remove blood (blanching), while the liver was excised and placed on a plastic net over a funnel that allows fluids to be collected and recirculated. Freshly dissolved collagenase (100 mg/kg weight) in for 3 min. The pellets are pooled into two 50-ml tubes and the pellets are washed once with for 10 min at 4C. To remove remaining hepatocytes, the cell pellets, resuspended in 5 ml of RPMI-BSA, are pooled and centrifuged at 100 for 3 min, and then all but the bottom 10 ml of the supernatant is usually removed and saved. The cell pellet is usually resuspended, the procedure is usually repeated, and the final pooled supernatants are then centrifuged at 200 for 10 min to pellet the SECs. The pellets are resuspended in 30 ml RPMI-BSA and 10 ml is usually layered onto each of three Percoll step gradients (20 ml NU6300 of 25% over 15 ml of 50% Percoll). The gradients are centrifuged (4C for 20 min at 900 for 10 min to remove Percoll. The cells are resuspended in RPMI and incubated on sterile glass petri dishes for 10 min to remove Kupffer cells, which settle out and adhere to the glass, whereas the SECs remain in suspension. For endocytosis experiments, the final SECs, 95%.
