Expression profile of vascular cell adhesion molecule-1 (CD106) in inflammatory foci using rhenium-188 labelled monoclonal antibody in mice.
Rhenium (Re)-188 is a generator (W-188/Re-188) produced high energy beta-emitter suitable for radionuclide therapy (T1/2 is 16.9 hrs and Emax 2.1 MeV (range 11 mm)). We have labelled monoclonal antibody (MAb) raised against vascular cell adhesion molecule-1 (VCAM-1) with Re-188 using glucoheptonate chelation technique and SnCl2 as reducing agent. The labelling efficiency, free perrhenate and reduced Re were controlled with thin layer chromatography and the purification of Re-188-MoAbs was performed using gel filtration. Our results indicate that Re-188-labelled antibodies remain in vitro stable and the labelling purity is > 90%. We also have applied these Re-188-MoAbs for detection of inflammatory disease in a mouse. The effective half-lives of organs of interest after an injection of Re-188-anti-VCAM1 were as follows: blood 5.2 hr, kidney 4.7 hr, and liver 9.6 hr. Re-188-anti-VCAM-1 was found to accumulate mainly in kidney and liver. One hour after the injection, the kidney contained in average as high as 12.5% and the liver 2.8 ID/g tissue. After 6 hr, the kidney contained 5.5% ID/g and the liver 2.6% ID/g. At 24 hr, the kidney uptake was 0.5% ID/g and the liver uptake 0.8% ID/g, respectively. The inflamed foci, subcutaneous lesions in the footpad skin, were visualized using gamma camera. From the distribution data the uptakes in the inflamed foci as follows: at 1 hr 2.18 (inflammation) and 1.72% ID/g (control), at 6 hr 1.42 (inflammation) and 0.85% ID/g (control), and at 24 hr 0.17 (inflammation) and 0.084% ID/g (control), respectively. Anti-VCAM-1 MAb showed better targeting as compared to control MoAbs in inflammation (caused by E.coli lipoplysaccaride). In conclusion, Re-188 is suitable for MAb labelling, and MAb against VCAM-1 may be used for detection of local inflammatory disease.
Department of Clinical Chemistry, Helsinki University Central Hospital, Finland.
K J
KJ
Kairemo
S
S
Strömberg
T K
TK
Nikula
S L
SL
Karonen
D000818:Animals; D000911:Antibodies, Monoclonal; D015870:Gene Expression / Q000502:physiology; D007249:Inflammation / Q000276:immunology*; D008070:Lipopolysaccharides; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D011863:Radioimmunoassay; D011868:Radioisotopes; D012211:Rhenium; D019010:Vascular Cell Adhesion Molecule-1 / Q000032:analysis / Q000235:genetics* / Q000276:immunology*
D000911:Antibodies, Monoclonal; D008070:Lipopolysaccharides; D011868:Radioisotopes; D019010:Vascular Cell Adhesion Molecule-1; D012211:Rhenium