Study of the binding interaction between fluorinated matrix metalloproteinase inhibitors and Human Serum Albumin.

Published on May 22, 2014in European Journal of Medicinal Chemistry5.572
· DOI :10.1016/J.EJMECH.2014.03.064
Giuseppe Digilio18
Estimated H-index: 18
,
Tiziano Tuccinardi35
Estimated H-index: 35
(UniPi: University of Pisa)
+ 6 AuthorsArmando Rossello28
Estimated H-index: 28
(UniPi: University of Pisa)
Sources
Abstract
Abstract Fluorinated, arylsulfone-based inhibitors of Matrix Metalloproteinases (MMP) have been used, in the [ 18 F]-radiolabelled version, as radiotracers targeted to MMP-2/9 for Positron Emission Tomography (PET). Although they showed acceptable tumour uptake, specificity was rather low. To get further insights into the reason of low specificity, the binding interaction of these compounds with Human Serum Albumin (HSA) has been investigated. 19 F NMR spectroscopy showed that all compounds considered partition between multiple HSA binding sites, being characterized by either slow-exchange kinetics (with K a in the order of 10 5  M −1 ) and fast-exchange kinetics (with K a in the order of 10 4  M -1 ). For 2-(2-(4′-(2-fluoroethoxy)biphenyl-4-ylsulfonyl)phenyl)acetic acid ( 1a ) and 2-(2-(4′-(2-fluoroacetamido)biphenyl-4-ylsulfonyl)phenyl)acetic acid ( 1c ), these slow and fast-exchanging binding sites could be mapped to Sudlow's site I and II, respectively. It is shown that high affinity albumin binding constitutes a theoretical limitation for the specificity achievable by MMP-inhibitors as MMP-targeted PET tracers in cancer imaging, because albumin accumulating aspecifically in tumours lowers the binding potential of radiotracers.
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