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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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