SUR1 Activators
Chemical activators of the sulfonylurea receptor 1 (SUR1) encompass a variety of compounds that can modulate the activity of this protein by directly influencing the potassium channels with which SUR1 is associated. Tolbutamide, glibenclamide, glipizide, and glyburide are examples of sulfonylurea compounds that facilitate the closure of these potassium channels. When these chemicals interact with SUR1, they induce a conformational change in the protein that results in the inhibition of the potassium current. This inhibition leads to depolarization of the pancreatic beta cell membrane. As a consequence of depolarization, voltage-dependent calcium channels open, allowing an influx of calcium ions into the cell. The increase in intracellular calcium concentration is a signal that prompts the exocytosis of insulin granules. Each of these sulfonylurea compounds, while similar in their end effect, may bind slightly differently to SUR1, yet all result in the direct activation of the protein's regulatory function within the potassium channel complex.
In addition to sulfonylureas, meglitinides such as repaglinide, nateglinide, and mitiglinide also act as chemical activators of SUR1, albeit with slight differences in their binding sites compared to sulfonylureas. These agents still achieve the same ultimate effect-closure of the potassium channels. By binding to SUR1, meglitinides induce the potassium channel to shut, which similarly leads to the depolarization of the beta cell membrane. The depolarization triggers the same calcium-mediated pathway that culminates in insulin granule release. Furthermore, first-generation sulfonylureas like chlorpropamide, acetohexamide, and carbutamide also activate SUR1 by inhibiting the potassium channels, thus sharing the same fundamental mechanism of action as their newer counterparts. Glimepiride, another sulfonylurea, continues this pattern of SUR1 activation, emphasizing the critical role that the direct interaction with this protein plays in regulating the potassium channel activity and the subsequent cellular responses.
SEE ALSO...
| Product Name | CAS # | Catalog # | QUANTITY | Price | Citations | RATING |
|---|---|---|---|---|---|---|
Tolbutamide | 64-77-7 | sc-203298 | 5 g | $44.00 | 2 | |
Tolbutamide is a sulfonylurea that can close the potassium channels in the pancreatic beta cells, which leads to cell membrane depolarization. This depolarization opens voltage-dependent calcium channels, increasing intracellular calcium, which in turn triggers the exocytosis of insulin granules. As SUR1 is a subunit of the potassium channels affected by Tolbutamide, this drug directly activates SUR1 by inducing its closure. | ||||||
Glyburide (Glibenclamide) | 10238-21-8 | sc-200982 sc-200982A sc-200982D sc-200982B sc-200982C | 1 g 5 g 25 g 100 g 500 g | $46.00 $61.00 $117.00 $173.00 $530.00 | 36 | |
Glibenclamide, another sulfonylurea, also directly activates SUR1 by inhibiting its associated potassium channels in pancreatic beta cells. This inhibition causes cell depolarization, opening voltage-gated calcium channels and leading to insulin release. The specific interaction with SUR1 ensures the direct activation of the protein, leading to its physiological response. | ||||||
Repaglinide | 135062-02-1 | sc-219959 sc-219959A sc-219959B | 100 mg 250 mg 1 g | $219.00 $422.00 $1358.00 | 3 | |
Repaglinide is a meglitinide that activates SUR1 by binding to its associated potassium channels in pancreatic beta cells, leading to their closure. This results in depolarization and calcium influx, followed by insulin secretion. Unlike sulfonylureas, meglitinides bind to a different site on SUR1 but still directly activate the protein by closing the potassium channel. | ||||||
Nateglinide | 105816-04-4 | sc-394067 sc-394067A | 10 mg 25 mg | $192.00 $265.00 | ||
Nateglinide, a meglitinide analog, activates SUR1 by binding to and inhibiting the potassium channels in beta cells, causing depolarization. This action opens voltage-gated calcium channels, leading to insulin secretion. Nateglinide's direct interaction with SUR1, although at a different site than sulfonylureas, results in the activation of the protein's regulatory function. | ||||||
Chlorpropamide | 94-20-2 | sc-234350 | 25 g | $73.00 | 7 | |
Chlorpropamide is a first-generation sulfonylurea that activates SUR1 by inhibiting the potassium channels in pancreatic beta cells, leading to membrane depolarization and calcium influx, which promotes insulin release. This direct activation of SUR1 through channel inhibition is characteristic of sulfonylureas and is consistent with the known function of SUR1 in these channels. | ||||||