caa a22 4500 47712769X CHVBK 20180405111654.0 cr unu---uuuuu 170330e19970801xx s 000 0 eng 10.1023/A:1012117815460 doi (NATIONALLICENCE)springer-10.1023/A:1012117815460 Carboxyl-directed Pegylation of Brain-derived Neurotrophic Factor Markedly Reduces Systemic Clearance with Minimal Loss of Biologic Activity [Elektronische Daten] [Toshiyasu Sakane, William Pardridge] Purpose. Brain-derived neurotrophic factor (BDNF) was modified by carboxyl-directed protein pegylation in order to both retain biologic activity of the neurotrophin and reduce the rate of systemic clearance of this cationic protein in vivo. Since the modification of surface lysine residues of neurotrophins results in loss of biologic activity, the present studies examine the feasibility of placing polyethyleneglycol (PEG) polymers on carboxyl residues of surface glutamate or aspartate residues of BDNF. Methods. PEG molecules with terminal hydrazide (Hz) moieties of molecular weight 2,000 (PEG2000-Hz) or 5,000 (PEG5000-Hz) Daltons were coupled to BDNF carboxyls using carbodiimide. Results. The systemic clearances of the BDNF-PEG2000 and BDNF-PEG5000 were reduced 67% and 91%, respectively, compared to unconjugated BDNF. The brain volume of distribution (VD) of BDNF-PEG5000 was not significantly different from the cerebral plasma volume. Cell survival studies and TrkB auto-phosphorylation assays showed that the biologic activity of BDNF was not changed following pegylation with PEG2000, and was minimally impaired following pegylation with PEG5000. Conclusions. These experiments describe the first carboxyl-directed pegylation of a neuropeptide, and show this formulation substantially reduces the systemic distribution and elimination of the neurotrophic factor. The biologic activity of the neurotrophin is retained with carboxyl-directed pegylation. Plenum Publishing Corporation, 1997 pegylation nationallicence pharmacokinetics nationallicence blood-brain barrier nationallicence Sakane Toshiyasu Department of Medicine, UCLA School of Medicine, 90095-1682, Los Angeles, California aut Pardridge William Department of Medicine, UCLA School of Medicine, 90095-1682, Los Angeles, California aut Pharmaceutical Research Kluwer Academic Publishers-Plenum Publishers 14/8(1997-08-01), 1085-1091 0724-8741 14:8<1085 1997 14 11095 https://doi.org/10.1023/A:1012117815460 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1012117815460 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sakane Toshiyasu Department of Medicine, UCLA School of Medicine, 90095-1682, Los Angeles, California aut NATIONALLICENCE 700 1- Pardridge William Department of Medicine, UCLA School of Medicine, 90095-1682, Los Angeles, California aut NATIONALLICENCE 773 0- Pharmaceutical Research Kluwer Academic Publishers-Plenum Publishers 14/8(1997-08-01), 1085-1091 0724-8741 14:8<1085 1997 14 11095 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer