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Beta cell

Revision as of 18:43, 6 November 2006 by (Talk)

Synonyms: B-cell, beta-cell, β-cell
German: Betazelle

1 Definition

Insulin producing cells in pancreatic Langerhans-islands are referred to as beta cells. Beta cells amount as much as 80 percent of cell mass in pancreatic islands.

2 Physiology

Glucose that is absorbed and metabolized to ATP is the most important stimulus of insulin secretion from beta cells.

Increased ATP concentration inhibits potassium channels in the cell membrane. Reduced potassium loss leads to depolarization of the cell membrane.

In the consequence voltage dependent calcium channels are activated that permit inflow of calcium thus mediating secretion of insulin.

Insulin is a potent antihyperplycemic and prohypoglycemic hormone thus closing the feedback loop that control blood glucose levels.

3 Diagnostical procedures

Beta cell function may be assessed primarily by oral glucose tolerance tests (OGTT) or intravenous glucose tolerance tests (ivGTT). Additional information is provided by advanced cybernetic methods like

Imaging methods displaying mass and distribution of beta cells are in state of development.

This page was last edited on 6 November 2006, at 18:32.

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