Abstract:
:Antibodies and fragments thereof are, because of high selectivity for their targets, considered as potential therapeutics and biomarkers for several neurological disorders. However, due to their large molecular size, antibodies/fragments do not easily penetrate into the brain. The aim of the present study was to improve the brain distribution via adsorptive-mediated transcytosis of an amyloid-beta (Aβ) protofibril selective F(ab')2 fragment (F(ab')2-h158). F(ab')2-h158 was cationized to different extents and the specific and unspecific binding was studied in vitro. Next, cationized F(ab')2-h158 was labelled with iodine-125 and its brain distribution and pharmacokinetics was studied in mice. Cationization did not alter the in vitro affinity to Aβ protofibrils, but increased the unspecific binding somewhat. Ex vivo experiments revealed a doubling of brain concentrations compared with unmodified F(ab')2-h158 and in vivo imaging with single photon emission computed tomography (SPECT) showed that the cationized F(ab')2-h158, but not the unmodified F(ab')2-h158 could be visualized in the brain. To conclude, cationization is a means to increase brain concentrations of therapeutic antibodies or fragments and may facilitate the use of antibodies/fragments as imaging biomarkers in the brain.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Syvänen S,Edén D,Sehlin Ddoi
10.1016/j.bbrc.2017.09.065subject
Has Abstractpub_date
2017-11-04 00:00:00pages
120-125issue
1eissn
0006-291Xissn
1090-2104pii
S0006-291X(17)31825-9journal_volume
493pub_type
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