哺乳類の統合ストレス反応の可塑性

Chien-Wen Chen¹, David Papadopoli^2,3, Krzysztof J Szkop⁴

¹Department of Genetics and Genome Sciences, Case Western Reserve University, Cleveland, OH, USA.

Nature

|March 27, 2025

まとめ

研究者らは,正規のISRとは異なる新しいストレス反応経路,分割統合ストレス反応 (s-ISR) を発見した. この経路は,eIF4E-ATF4-PCK2軸を使用して,eIF2Bの活性が低下したときにエネルギーホメオスタシスを維持します.

科学分野:

細胞生物学
分子生物学
生物化学

背景:

標準的な統合ストレス反応 (c-ISR) は,eIF2αのリン酸化とeIF2Bの活性低下を伴う.
eIF2α リン酸化のない白血病のような疾患における eIF2B 活性低下の役割は不明である.
病気の研究にはストレス反応の代替メカニズムを理解することが重要です

研究の目的:

eIF2α リン酸化がない場合の eIF2B 活性低下のメカニズムを解明する.
c-ISRとは異なる新しいストレス反応経路を特定する.
細胞がこれらの条件下でエネルギーホメオスタシスを維持する方法を理解する

主な方法:

eIF2Bの活動障害に対する細胞の反応を研究した.
翻訳と転写の変化を分析した.
反応におけるeIF4E,ATF4,PCK2の役割を調べました.

主要な成果:

分割されたISR (s-ISR) と呼ばれる新しいメカニズムを特定しました.
s-ISRは,c-ISRと比較して異なる翻訳および転写プログラムによって特徴付けられます.
s-ISRには,eIF4E依存の翻訳とATF4 mRNAの安定化が必要です.
これはPCK2のような代謝遺伝子の発現が変化しエネルギーホメオスタシスのための代謝を再構成します
哺乳類のISRの可塑性を証明した.

結論:

eIF2αのリン酸化なしでのeIF2Bの活動障害は,s-ISRを誘発する.
s-ISRは,eIF4E-ATF4-PCK2軸を活性化し,エネルギーホメオスタシスを維持する.
これは哺乳類の細胞がストレスに反応する新しい適応メカニズムを示しています

さらに関連する動画

07:13

The Unpredictable Chronic Mild Stress Protocol for Inducing Anhedonia in Mice

Published on: October 24, 2018

17.3K

05:28

A Chronic Immobilization Stress Protocol for Inducing Depression-Like Behavior in Mice

Published on: May 15, 2019

21.9K

関連する概念動画

01:24

Physiological Foundation of Stress

Stress triggers a coordinated physiological response involving the sympathetic nervous system (SNS) and the hypothalamic-pituitary-adrenal (HPA) axis. This dual activation ensures that the body is prepared for both immediate and prolonged stress management. The process begins with the perception of a stressor. This initial phase activates the SNS, leading to the rapid release of adrenaline (epinephrine) from the adrenal glands.
Role of the Sympathetic Nervous System
Adrenaline triggers the...

01:25

The Sympathetic Nervous System

Introduction to Stress and Lifestyle

Stress is a multifaceted response to events perceived as challenging or threatening, highlighting physical, emotional, cognitive, and behavioral reactions. Physically, stress can lead to fatigue, sleep disruptions, and various health issues such as frequent colds, chest pains, and nausea. Emotionally, it can manifest as anxiety, depression, irritability, and anger triggered by both minor and major life events. Cognitively, it may result in difficulty in concentration, memory, and...

01:01

Neuroplasticity

255

Neuroplasticity reflects the brain's remarkable capacity to adapt and evolve, responding dynamically to learning, experiences, or injury by reorganizing its neural circuitry. This reorganization involves creating new neural connections and refining old ones through a series of biological processes that contribute to the brain's lifelong development and adaptability.

255

01:20

Psychological Responses to Stress

Psychological responses to stress encompass the various cognitive and emotional reactions individuals experience when faced with challenging or threatening situations, such as a job loss. Prolonged exposure to stressors can disturb emotional balance, increasing negative emotions (e.g., anxiety and sadness) and diminishing positive emotions (e.g., joy and satisfaction). These persistent emotional shifts are associated with an increased risk of both physical illness and mental health issues, such...

01:21

Stress Response System

The stress response system, also known as the fight-or-flight response, is the body's automatic physiological reaction to perceived threats. Hans Selye introduced the concept of General Adaptation Syndrome (GAS) to describe the predictable pattern of changes that occur in response to stress. GAS consists of three sequential stages: alarm, resistance, and exhaustion. This model helps explain how chronic stress can contribute to health problems.
Alarm stage
In the alarm stage, the body's...

関連する実験動画