Induction of a Glucose‐Dependent Insulin Secretory Response by the Nonmetabolizable Amino Acid α‐Aminoisobutyric Acid
作者:
Neville McClenaghan,
Alf Berts,
Staffan Dryselius,
Eva Grapengiesser,
Samir Saha,
Bo Hellman,
期刊:
Pancreas
(OVID Available online 1997)
卷期:
Volume 14,
issue 1
页码: 65-70
ISSN:0885-3177
年代: 1997
出版商: OVID
关键词: α-Aminoisobutyric acid;Alanine;Insulin release;Sodium
数据来源: OVID
摘要:
The effects of the nonmetabolizable amino acid a-aminoisobutyric acid (AIB) on insulin release were evaluated using β cell-rich pancreatic islets fromob/obmice. Both AIB and L-alanine promptly induced transient insulin release during column perifusion of islet cells. The secretory response was dependent on an elevated level of glucose and effectively suppressed by removal of Na+. The insulin release elicited by AIB fulfilled the criteria of a physiological event in being suppressed by clonidine or lowering of the temperature to 22°C.AIB effectively promoted the increase in sodium (total as well as ionized cytoplasmic) obtained with ouabain blockage of the Na/K pump. When added to a medium containing 11 mMglucose, AIB altered cytoplasmic Ca2+in terms of both an initial transitory rise and transformation of existing oscillations into a sustained elevation. It is concluded that amino acids can stimulate insulin release from mature β cells by virtue of being cotransported with Na+.
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