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Hypothalamic-Pituitary Axis01:37

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The response to stress—be it physical or psychological, acute or chronic—involves activation of the Hypothalamic-Pituitary-Adrenal (HPA) axis. The HPA axis is part of the neuroendocrine system because it involves both neuronal and hormonal communication. Its function is to regulate homeostatic systems—metabolic, cardiovascular, and immune—providing the necessary means to respond to a stressor.
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Although digestion of proteins, carbohydrates, and lipids may begin in the stomach, it is completed in the intestine. The absorption of nutrients, water, and electrolytes from food and drink also occurs in the intestine. The intestines can be divided into two structurally distinct organs—the small and large intestines.
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The small intestine is an ~7 meter-long tube with an inner diameter of just 2.5 cm. Since most nutrients are absorbed here, the inner lining of the...
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The perpendicular-axis theorem states that the moment of inertia of a planar object about an axis perpendicular to its plane is equal to the sum of the moments of inertia about two mutually perpendicular concurrent axes lying in the plane of the body.
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The parallel-axis theorem provides a convenient and quick method of finding the moment of inertia of an object about an axis parallel to the axis passing through its center of mass. Consider a thin rod as an example. There is a striking similarity between the process of finding the moment of inertia of a thin rod about an axis through its middle, where the center of mass lies, and about an axis through its end using the conventional method. In the conventional method, the concept of linear mass...
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In structural engineering, the analysis of beams subjected to varying loads is a critical aspect of understanding the behavior and performance of these structural elements. A common scenario involves a beam subjected to a combination of different load distributions.
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The moment of inertia is a fundamental concept in mechanical engineering that plays a significant role in designing rotationally symmetric objects such as flywheels, gears, and other mechanical systems. In this context, we will discuss the moment of inertia of a flywheel rotating about its centroidal axis and how it relates to the moment of inertia about an axis parallel to it.
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腸内マクロファージは,腸-脳軸に沿ってシヌクレイン病変を調節する.

Sebastiaan De Schepper1,2, Viktoras Konstantellos3, James A Conway3

  • 1UK Dementia Research Institute, University College London, London, UK. sebastiaan.deschepper@uantwerpen.be.

Nature
|January 28, 2026
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まとめ

Muscularisマクロファージは,腸の神経系でパーキンソン病 (PD) の病理を誘発する. これらの細胞をターゲットにすることで,病理の広がり,神経変性,および運動欠陥を軽減し,早期のPDバイオマーカーを潜在的に提供します.

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科学分野:

  • 神経科学は神経科学である.
  • 免疫学 免疫学とは
  • 胃腸内科 胃腸内科

背景:

  • パーキンソン病 (PD) は腸内神経系 (ENS) から発生し,アルファ-シヌクレイン (αS) 病理が脳に広がる可能性があります.
  • 便秘とT細胞のαSへの応答は,PD患者の早期の周辺免疫関与を示唆しています.

研究 の 目的:

  • ENSにおけるαS病理を誘発する細胞メカニズムと,その腸-脳軸の広がりを調査する.
  • PDの病原性における筋膜マクロファージ (ME-Macs) の役割を決定する.

主な方法:

  • αS病理および神経変性におけるME-Macsの役割を研究するためにPDモデルを使用しました.
  • ME-MacsにおけるαSの存在,エンドリソソーム機能障害,T細胞変調を調査した.
  • PDの病理学と運動機能に対する指向されたME-Mac枯渇の影響を評価した.

主要な成果:

  • ME-Macは,誤った折り畳まれたαSを含み,エンドリソソーム機能障害を示すことが判明しました.
  • ME-MacはT細胞の膨張を調節し,T細胞はENSから脳へと伝達する.
  • ME-Macの枯渇により,αS病理,T細胞の拡張,神経変性,運動機能障害が減少した.

結論:

  • ME-Macsは,PDにおける腸-脳軸に沿ったαS病理の初期の細胞イニシアターとして作用します.
  • これらの発見は,ME-MacsがPDの病原性において極めて重要であり,早期のバイオマーカーの標的となる可能性があることを示唆しています.