Abstract
To overcome the limitation of conventional sulfonylurea (SU) for investigation of biological mechanisms related to KATP channels, a hypoglycemic sulfonylurea (SU) was conjugated with a non-reducing glucose bearing polystyrene (PS) derivative to provide enhanced interaction with an insulinoma cell line (MIN6). The specific interaction between the SU (K+ channel closer)-conjugated copolymer and MIN6 cells was confirmed by confocal laser microscopic images using rhodamine B isothiocyanate (RITC)-labeled SU-conjugated polymer, which revealed the specific interaction between SU-conjugated polymer and MIN6 cells. Moreover, the location of labeled polymer and the site of Ca2+ ion mobilization obtained from the same MIN6 cells were identical. Based on the specificity and insulinotropic activity, the SU-conjugated polymer is expected to be useful tool for the study of biological mechanisms of KATP channels.
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