The multifaceted role of ATF4 in regulating glucose-stimulated insulin secretion.

Mitsuaki Sobajima, Masato Miyake, Yoshimasa Hamada, Kazue Tsugawa, Miho Oyadomari, Ryota Inoue, Jun Shirakawa, Hiroshi Arima, Seiichi Oyadomari

Biochemical and biophysical research communications 2022 Jun 30

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Stress-inducible transcription factor ATF4 is essential for survival and identity of β-cell during stress conditions. However, the physiological role of ATF4 in β-cell function is not yet completely understood. To understand the role of ATF4 in glucose-stimulated insulin secretion (GSIS), β-cell-specific Atf4 knockout (βAtf4KO) mice were phenotypically characterized. Insulin secretion and mechanistic analyses were performed using islets from control Atf4f/f and βAtf4KO mice to assess key regulators for triggering and amplifying signals for GSIS. βAtf4KO mice displayed glucose intolerance due to reduced insulin secretion. Moreover, βAtf4KO islets exhibited a decrease in both the insulin content and first-phase insulin secretion. The analysis of βAtf4KO islets showed that ATF4 is required for insulin production and glucose-stimulated ATP and cAMP production. The results demonstrate that ATF4 contributes to the multifaceted regulatory process in GSIS even under stress-free conditions. Copyright © 2022 Elsevier Inc. All rights reserved.

Citation

Mitsuaki Sobajima, Masato Miyake, Yoshimasa Hamada, Kazue Tsugawa, Miho Oyadomari, Ryota Inoue, Jun Shirakawa, Hiroshi Arima, Seiichi Oyadomari. The multifaceted role of ATF4 in regulating glucose-stimulated insulin secretion. Biochemical and biophysical research communications. 2022 Jun 30;611:165-171