桃体機能と恐怖に関連する行動におけるTRPC5の重要な役割
Antonio Riccio1, Yan Li, Jisook Moon
1Department of Cardiology, Howard Hughes Medical Institute, Manton Center for Orphan Disease, Children's Hospital Boston, Boston, MA 02115, USA.
Cell
|May 20, 2009
まとめ
トランジエント受容体ポテンシャルチャネル5 (TRPC5) を欠いたマウスは,先天的な恐怖反応が減少したことを示した. これは,TRPC5チャネルが,桃体内のGタンパク質結合受容体によって媒介される,先天的な恐怖行動に不可欠であることを示唆しています.
科学分野:
- 神経科学は神経科学である.
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- トランジエント受容体ポテンシャルチャネル5 (TRPC5) は,主に脳に存在します.
- TRPC5チャネルは,TRPC1およびTRPC4サブユニットと複合体を形成します.
- これらのチャネルは刺激性であり,Gタンパク質結合受容体によって調節される非選択性カチオンを誘導する.
研究 の 目的:
- 生まれつきの恐怖行動におけるTRPC5の役割を調査する.
- 恐怖反応に関連した桃体内のシナプス伝送にTRPC5チャンネルが関与しているかどうかを判断する.
主な方法:
- TRPC5ノックアウト (TRPC5(-/-)) マウスを使用した.
- 嫌悪的刺激への反応として,先天的な恐怖のレベルを評価した.
- アミグダラのニューロンにおけるシナプス反応を調査し,グループIのメタボトロピックグルタミン酸およびコレシストキニン2受容体によって媒介されるものを含む.
- アミグダラの入力におけるシナプス伝達,膜刺激性,および長期的増強を測定した.
主要な成果:
- TRPC5 ((-/-) マウスは先天的な恐怖を大幅に減少させた.
- ミュータントマウスは,桃体ニューロンにおけるグループI mGluRおよびCCK2R活性化に対するシナプス反応の低下を示した.
- アミグダラへのアフェレント入力におけるシナプス強度は,若いTRPC5 (((-/-) マウスで減少した.
- 初期シナプス伝達と興奮性は,高齢のTRPC5 (((-/-) マウスではほとんど影響を受けませんでした.
結論:
- TRPC5は,先天的な恐怖に不可欠な役割を果たしています.
- Gタンパク質結合ニューロン受容体によるTRPC5の活性化は,恐怖の処理に不可欠です.
- TRPC5チャネルは,先天的な恐怖反応に関与する特定のシナプス経路に不可欠です.
関連する概念動画
Functional Brain Systems: Limbic System
6.3K
The limbic system, often called the "emotional brain," is a complex set of structures located deep within the brain. The intricate network of the limbic system supports a wide range of psychological functions, from emotional regulation to memory formation and sensory processing. This functional brain region encompasses specific parts of the diencephalon and the cerebrum, integrating the higher mental functions of the cerebral cortex with the primitive emotional responses of the deep brain...
6.3K
Role of Amygdala in Memory
1.0K
The amygdala is a small, almond-shaped structure responsible for processing and storing memories, particularly those linked to emotions like fear and stress. It plays an essential role in the brain's response to emotionally significant events and often enhances memory formation by triggering stress hormone release. The amygdala is vital for encoding and retrieving memories associated with fear or stress, a process that is adaptive by helping organisms avoid dangerous situations.
One of the...
One of the...
1.0K
Enzyme-linked Receptors
85.6K
Enzyme-linked receptors are proteins that act as both receptor and enzyme, activating multiple intracellular signals. This is a large group of receptors that include the receptor tyrosine kinase (RTK) family. Many growth factors and hormones bind to and activate the RTKs.
Neurotrophin (NT) receptors are a family of RTKs, including trkA, trkB, and trkC (tropomyosin-related kinase) receptors. TrkA is specific for nerve growth factor (NGF), neurotrophin-6, and neurotrophin-7. TrkB binds...
Neurotrophin (NT) receptors are a family of RTKs, including trkA, trkB, and trkC (tropomyosin-related kinase) receptors. TrkA is specific for nerve growth factor (NGF), neurotrophin-6, and neurotrophin-7. TrkB binds...
85.6K
Traumatic Memory
515
Emotionally traumatic events often lead to memories that are exceptionally vivid and enduring, sometimes persisting with remarkable clarity throughout an individual's life. A classic example of this phenomenon is a person who survives a car accident. Even years later, they may recall every detail of the event with startling accuracy — the screeching of the tires, the jarring impact, and the acrid smell of burning rubber. Such vividness contrasts sharply with how an individual...
515
Physiology of Emotion
3.1K
The physiology of emotions is a multifaceted process involving the autonomic nervous system, brain structures, hormones, and neurotransmitters. This intricate interplay dictates how emotions manifest in the body and influence behavior.
Autonomic Nervous System
The autonomic nervous system (ANS) plays a critical role in emotional responses by regulating involuntary physiological functions. It consists of two main components: the sympathetic and parasympathetic systems. The sympathetic system...
Autonomic Nervous System
The autonomic nervous system (ANS) plays a critical role in emotional responses by regulating involuntary physiological functions. It consists of two main components: the sympathetic and parasympathetic systems. The sympathetic system...
3.1K


