ノラドレナージック調節により,コレナージック分化が調節される
1Department of Neurosciences, Case Western Reserve University School of Medicine, Cleveland, OH 44106-4975.
まとめ
交感神経は神経伝達物質をアセチルコリンに切り替え,ネズミの汗腺を神経化します. この変化は,汗腺因子 (SGF) の生成を刺激するカテキオラミンによって誘発され,相互の神経発達を強調します.
科学分野:
- 神経科学は神経科学である.
- 発達生物学 発達生物学について
- 細胞生物学 細胞生物学
背景:
- 交感神経は通常ノレピネフリンを使用しますが,汗腺はアセチルコリンを使用して神経化されます.
- この神経伝達物質のスイッチを駆動する分子機構は完全に理解されていません.
研究 の 目的:
- シナプスの発達中に交感神経と汗腺の間の有益な相互作用を調査する.
- ノルエピネフリンからアセチルコリン神経伝達への切り替えを媒介する要因を特定する.
主な方法:
- ネズミの汗腺細胞と共感神経細胞の共同培養.
- 汗腺因子 (SGF) 生産の評価.
- アドレナージック受容体 (アルファ1およびβ) の薬理学的阻害.
- 交感切除されたネズミの汗腺の分析.
主要な成果:
- 交感性だが,感覚性ではない神経細胞を培養すると,汗腺の細胞でSGFの生成が誘発される.
- アルファ1またはベータアドレナゲン受容体をブロックすると,共感性ニューロンにおけるコレリン性フェノタイプの獲得を阻害する.
- 交感切除された動物の汗腺は,SGFの欠乏を示した.
結論:
- 相互に伝達する相互作用が,交感性汗腺シナプスの発達を導く.
- 神経によって放出されるカテキオラミンは,アドレネルゲン受容体を通して作用し,SGFの産生を刺激し,神経伝達物質の可塑性を媒介する.
- このプロセスは,シナプス発達の方向づけに小さな分子神経伝達物質を伴う.
関連する概念動画
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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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Cholinergic Receptors: Nicotinic
Nicotinic receptors are ligand-gated ion channels that are activated by acetylcholine and nicotine. Upon activation, they cause a rapid increase in the permeability of cells to K+, Na+, and Ca2+, followed by depolarization and excitation. They are in the autonomic ganglia, skeletal neuromuscular junction, CNS, and adrenal medulla.
There are two types of nicotinic receptors: neuromuscular (NM/NM/N1) and neuronal (NN/NN/N2). The two families differ based on their location and selectivity to...
There are two types of nicotinic receptors: neuromuscular (NM/NM/N1) and neuronal (NN/NN/N2). The two families differ based on their location and selectivity to...
Adrenergic Receptors: ɑ Subtype
Adrenoceptors are classified into α and ꞵ classes based on their potencies to catecholamine agonists. α-adrenoceptors show the following order of catecholamine potency:
Adrenaline ≥ Noradrenaline >> Isoprenaline
α-adrenoceptors are further divided into α1 and α2-adrenoceptors.
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Adrenaline ≥ Noradrenaline >> Isoprenaline
α-adrenoceptors are further divided into α1 and α2-adrenoceptors.
α1-Adrenoceptors: These receptors are located postsynaptically on the effector organs and cause constriction of smooth muscle mediated by activation of phospholipase C—inositol-1,4,5-trisphosphate...
Sympathetic Signaling
Sympathetic signaling, a vital part of the autonomic nervous system, plays a crucial role in mobilizing the body's resources in response to stress or emergencies. It involves the transmission of nerve impulses from sympathetic preganglionic fibers to postganglionic fibers. This results in the release of specific neurotransmitters and activation of adrenergic receptors.
Sympathetic preganglionic fibers release the neurotransmitter acetylcholine (ACh) onto the ganglionic neurons in the...
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Parasympathetic Signaling
Parasympathetic signaling plays a crucial role in regulating various physiological processes. It involves the release of acetylcholine (ACh) by parasympathetic neurons, which can have localized and short-lived effects. The majority of ACh released is rapidly inactivated at the synapse by the enzyme acetylcholinesterase (AChE), which hydrolyzes Ach into choline and acetate. Additionally, the tissue cholinesterase deactivates any ACh diffusing into the surrounding tissues.
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The effects of...


