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Chemical Synapses01:26

Chemical Synapses

Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
GPCR Desensitization01:12

GPCR Desensitization

G protein-coupled receptor (GPCR) signaling plays a crucial role in cell functioning. GPCR desensitization is an equally essential process. It allows cells to respond to changing environments and regain sensitivity to new stimuli while preventing unnecessary stimulation when no longer needed. Prolonged exposure to stimuli leads to GPCR desensitization. It involves blocking the receptors from binding and activating additional G proteins. This inhibits activation of downstream effectors, thereby...
G-Protein Gated Ion Channels01:21

G-Protein Gated Ion Channels

GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
Sensory organs,...
GPCRs Regulate Adenylyl Cylase Activity01:09

GPCRs Regulate Adenylyl Cylase Activity

Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of cells.
Two...
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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
Cholinergic Receptors: Muscarinic01:25

Cholinergic Receptors: Muscarinic

The pharmacological actions of acetylcholine are elicited via its binding to two families of cholinergic receptors or cholinoceptors, namely, muscarinic and nicotinic receptors. Muscarinic receptors are G protein-coupled receptors and have five subtypes, M1–M5. All mAChR subtypes are activated by acetylcholine and blocked by the antagonist, atropine. 
The subtypes M1, M3, and M5 couple with the Gq subunit and activate the phospholipase C (PLC) activity, mobilizing intracellular Ca2+. Activation...

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Updated: May 8, 2026

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強化されたmGluR1機能は運動失調および領域特異的なプルキンエ細胞機能不全を引き起こす

Mohamed F Ibrahim1,2, Sevda Boyanova1,2, Yin Chun Cheng1,2

  • 1Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, OX3 9DU, UK.

Brain : a journal of neurology
|January 12, 2026
PubMed
まとめ

メタΒトロピックグルタミン酸受容体1（mGluR1）シグナル伝達の強化は、脊髄小脳失調症（SCA）を引き起こす。この研究は

キーワード:
Grm1プルキンエ細胞運動失調小脳mGluR1選択的脆弱性

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科学分野:

  • 神経科学
  • 遺伝学
  • 分子生物学

背景:

  • 脊髄小脳失調症（SCA）は、効果的な治療法がない遺伝性神経変性疾患である。
  • メタΒトロピックグルタミン酸受容体1（mGluR1）シグナル伝達はSCAに関与しているが、疾患の病因におけるその役割は議論されている。
  • メタΒトロピックグルタミン酸受容体1（Grm1）遺伝子の機能獲得変異は、SCA44に関連している。

研究 の 目的:

  • SCAの病因におけるmGluR1シグナル伝達強化の役割を調査する。
  • SCA44の研究のための新規マウスモデルを開発し、特徴づける。

主な方法:

  • Grm1遺伝子の機能獲得変異（p.Y792C）を持つマウスモデルの作製。
  • Grm1変異マウスにおける運動機能、プルキンエ細胞（PC）活動、およびシナプス神経支配の評価。
  • 疾患の進行および病理の領域特異性の分析。

主要な成果:

  • Grm1変異マウスは、SCAに特徴的な進行性の運動失調を示す。
  • 過剰なmGluR1シグナル伝達は、登上線維の神経支配の変化とPC自発活動の摂動につながる。
  • 病理学的変化は小葉および疾患段階に特異的であり、PC集団の選択的脆弱性を強調している。

結論:

  • 強化されたmGluR1機能は、PC機能不全およびSCA病理の直接的な原因である。
  • このマウスモデルは、SCAおよび選択的神経脆弱性の根底にあるメカニズムに関する洞察を提供する。
  • 発見は、神経変性におけるmGluR1シグナル伝達の役割を明確にし、潜在的な治療標唆を示唆する。