1 research outputs found
Design, synthesis and biological evaluation of novel estrone phosphonates as high affinity organic anion-transporting polypeptide 2B1 (OATP2B1) inhibitors
Organic anion-transporting polypeptide 2B1 (OATP2B1) is a multispecific membrane transporter mediating
the cellular uptake of various exo- and endobiotics, including drugs and steroid hormones. Increased
uptake of steroid hormones by OATP2B1 may increase tumor proliferation. Therefore, understanding OATP2B1′
s substrate/inhibitor recognition and inhibition of its function, e.g., in hormone-dependent tumors,
would be highly desirable. To identify the crucial structural features that correlate with OATP2B1 inhibition,
here we designed modifications at four positions of the estrane skeleton. 13α- or 13β-estrone phosphonates
modified at ring A or ring D were synthesized. Hirao and Cu(I)-catalyzed azide–alkyne click reactions
served in the syntheses as key steps. 13β-Derivatives displayed outstanding OATP2B1 inhibitory action with
IC50 values in the nanomolar range (41–87 nM). A BODIPY-13α-estrone conjugate was additionally synthesized,
modified at C-3-O of the steroid, containing a four-carbon linker between the triazole moiety and the
BODIPY core. The fluorescent conjugate displayed efficient, submicromolar OATP2B1 inhibitory potency.
The newly identified inhibitors and the structure–activity relationships specified here promote our understanding
about drug recognition of OATP2B1