Abstract:
:This study describes and characterizes a putative sulfonylurea receptor. The radioligand used was [3H]glipizide (9 Ci/mmol). The beta-cell plasma membranes were derived from a transplantable rat insulinoma generated by subcutaneous injection of RINm5F cells and purified by ultracentrifugation on a 15-55% sucrose gradient. Specific binding of [3H]glipizide to purified beta-cell plasma membranes was determined to be maximal at temperatures of 4-23 degrees C, pH 7.3, and an incubation of 2 h. Scatchard analysis indicated a single binding site with Kd = 7 nM and sulfonylurea binding of 0.93 pmol/mg membrane protein. Displacement of [3H]glipizide from the purified beta-cell plasma membranes by various sulfonylureas and their analogues correlated well with their known hypoglycemic and insulin-releasing activities. Various agents, including nutrients, agents affecting Ca2+ flux, gastrointestinal hormones, and pancreatic hormones, had no effect on [3H]glipizide binding to the beta-cell plasma membranes. Putative sulfonylurea receptors on beta-cell and brain cell plasma membranes have been reported by several groups of investigators. Sulfonylurea binding to the beta-cell is hypothesized to close an ATP-sensitive K+ channel, which leads to depolarization of the membrane and activation of a voltage-dependent Ca2+ channel.
journal_name
Diabetes Carejournal_title
Diabetes careauthors
Siconolfi-Baez L,Banerji MA,Lebovitz HEdoi
10.2337/diacare.13.3.2subject
Has Abstractpub_date
1990-08-01 00:00:00pages
2-8eissn
0149-5992issn
1935-5548journal_volume
13 Suppl 3pub_type
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