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Article

Decrease of γ-aminobutyric acid and zinc ions in the islet periportal circulation stimulates glucagon secretion during hypoglycemia

  • Authors:
    • Tingting Yu
    • Zhonghua Jiang
    • Li Liu
    • Zhining Fan
  • View Affiliations / Copyright

    Affiliations: Department of Digestive Medicine, Institute of Digestive Endoscopy, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210000, P.R. China, Department of Gastroenterology, The First People's Hospital of Yancheng, Yancheng, Jiangsu 224000, P.R. China
  • Pages: 2507-2511
    |
    Published online on: December 22, 2017
       https://doi.org/10.3892/etm.2017.5670
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Abstract

The present study assessed the effects of γ‑aminobutyric acid (GABA) from β‑cells on glucose levels and glucagon secretion, and identified channels via which glucagon secretion is initiated. An in vivo experiment was performed containing three groups: Intrapancreatic artery infusion of GABA alone, GABA plus insulin or insulin alone in rats with diabetes. Rats infused with GABA and insulin were also subdivided in groups receiving additional infusion of K+‑channel activator diazoxide (DIA), K+‑channel blocker tolbutamide (TLB) and calcium channel blocker nifedipine (NIF). In the hypoglycemic state, termination of infusion of insulin and insulin plus GABA resulted in signaling to the α‑cells to secrete glycogen, while that of GABA alone did not. However, intrapancreatic artery infusion of K+‑channel activator DIA, K+‑channel blocker TLB or calcium channel blocker NIF in addition to GABA and insulin had no effect on glucagon secretion. In conclusion, if the delivery of insulin or GABA plus insulin in rats with hypoglycemia is terminated, β‑cells are stimulated and signal the α‑cells to secrete glucagon. Thus, the detection of a sudden decrease in zinc levels by β‑cells as well as a decrease in GABA in the periportal circulation induces signaling to α‑cells to stimulate them to secrete glucagon.
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Copy and paste a formatted citation
Spandidos Publications style
Yu T, Jiang Z, Liu L and Fan Z: Decrease of γ-aminobutyric acid and zinc ions in the islet periportal circulation stimulates glucagon secretion during hypoglycemia. Exp Ther Med 15: 2507-2511, 2018.
APA
Yu, T., Jiang, Z., Liu, L., & Fan, Z. (2018). Decrease of γ-aminobutyric acid and zinc ions in the islet periportal circulation stimulates glucagon secretion during hypoglycemia. Experimental and Therapeutic Medicine, 15, 2507-2511. https://doi.org/10.3892/etm.2017.5670
MLA
Yu, T., Jiang, Z., Liu, L., Fan, Z."Decrease of γ-aminobutyric acid and zinc ions in the islet periportal circulation stimulates glucagon secretion during hypoglycemia". Experimental and Therapeutic Medicine 15.3 (2018): 2507-2511.
Chicago
Yu, T., Jiang, Z., Liu, L., Fan, Z."Decrease of γ-aminobutyric acid and zinc ions in the islet periportal circulation stimulates glucagon secretion during hypoglycemia". Experimental and Therapeutic Medicine 15, no. 3 (2018): 2507-2511. https://doi.org/10.3892/etm.2017.5670
Copy and paste a formatted citation
x
Spandidos Publications style
Yu T, Jiang Z, Liu L and Fan Z: Decrease of γ-aminobutyric acid and zinc ions in the islet periportal circulation stimulates glucagon secretion during hypoglycemia. Exp Ther Med 15: 2507-2511, 2018.
APA
Yu, T., Jiang, Z., Liu, L., & Fan, Z. (2018). Decrease of γ-aminobutyric acid and zinc ions in the islet periportal circulation stimulates glucagon secretion during hypoglycemia. Experimental and Therapeutic Medicine, 15, 2507-2511. https://doi.org/10.3892/etm.2017.5670
MLA
Yu, T., Jiang, Z., Liu, L., Fan, Z."Decrease of γ-aminobutyric acid and zinc ions in the islet periportal circulation stimulates glucagon secretion during hypoglycemia". Experimental and Therapeutic Medicine 15.3 (2018): 2507-2511.
Chicago
Yu, T., Jiang, Z., Liu, L., Fan, Z."Decrease of γ-aminobutyric acid and zinc ions in the islet periportal circulation stimulates glucagon secretion during hypoglycemia". Experimental and Therapeutic Medicine 15, no. 3 (2018): 2507-2511. https://doi.org/10.3892/etm.2017.5670
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