肝臓と小腸における空間的代謝グラデーション
Laith Z Samarah1,2,3, Clover Zheng4, Xi Xing1,2,3
1Department of Chemistry, Princeton University, Princeton, NJ, USA.
Nature
|October 15, 2025
まとめ
この研究では,高度な画像とAIを用いてマウスの肝臓と腸の空間代謝をマッピングしています. 主な代謝産物とエネルギーストレスのマーカーは 臓器特有の位置を示し,ダイエットが代謝健康にどのように影響するかを明らかにします.
科学分野:
- メタボロミクス
- システム生物学
- 臓器生理学
背景:
- 細胞の機能と性質は,臓器内の空間的な位置によって影響を受けます.
- 肝臓と腸の遺伝子発現パターンは空間的に変化し,基礎となる代謝の違いを示唆しています.
- 組織内の空間的代謝の直接的な評価は限られており,組織組織の完全な理解を妨げています.
研究 の 目的:
- マウスの肝臓と腸の 空間的代謝グラデーションをマップする
- これらの臓器における食中の果糖の代謝の運命を調査する.
- 臓器の機能と病気に対する空間代謝の影響を理解する.
主な方法:
- 統合された実験・計算ワークフローの開発
- マトリックスアシストレーザー脱吸収/イオン化 (MALDI) 画像質量スペクトロメトリ (IMS) を使用する.
- アイソトープトラッキングとディープラーニングの人工知能を組み込み,代謝物質の分析を行う.
主要な成果:
- 測定された代謝物の90%以上は肝臓と腸で有意な空間的濃度グラデーションを示した.
- トリカルボキシル酸 (TCA) サイクルメタボリートと同位体ラベルは,肝臓 (周縁部) と腸 (尖端対密室) の特定の領域に局限する.
- フルクトースの摂取は肝臓のATPの減少と腸の変異を引き起こした.
結論:
- 肝臓と腸の代謝組織に関する基礎知識
- 肝臓の代謝における果糖誘発的焦点異常を特定した.
- 臓器生理学と食事要因への反応における空間代謝の重要な役割を強調した.
さらに関連する動画
14:54An In Vivo Method for Evaluating the Gut-Blood Barrier and Liver Metabolism of Microbiota Products
Published on: October 20, 2018
8.9K
10:40Visualization and Analysis of Blood Flow and Oxygen Consumption in Hepatic Microcirculation: Application to an Acute Hepatitis Model
Published on: August 4, 2012
13.0K
関連する概念動画
Glucose Absorption Into the Small Intestine
35.0K
Complex carbohydrates consumed cannot be absorbed into the small intestine in their original form. First, they must be hydrolyzed to a monosaccharide form such as glucose or galactose. These monosaccharides are then transported across the intestinal membrane and into the blood via transcellular transport. The intestinal epithelial cells allow the movement of these monosaccharides with a defined 'entry' through membrane transporter proteins present on their apical membrane and...
35.0K
Carbohydrate Absorption
3.0K
Carbohydrates are essential macronutrients that serve as the body's primary energy source. Their digestion begins in the mouth, where salivary amylase partially breaks down complex carbohydrates such as starch into smaller oligosaccharides. This mechanical and enzymatic activity prepares carbohydrates for further processing in the gastrointestinal tract.
After being swallowed, the partially digested carbohydrates mix with gastric secretions in the stomach. However, the acidic environment...
After being swallowed, the partially digested carbohydrates mix with gastric secretions in the stomach. However, the acidic environment...
3.0K
Hepatic Portal System
5.3K
The hepatic portal system, a critical part of our circulatory framework, transports nutrient-laden, deoxygenated blood from the gastrointestinal tract and spleen to the liver. This ingenious system plays an indispensable role in maintaining our body's metabolic equilibrium.
At its core, the hepatic portal vein is the result of a confluence of the superior and inferior mesenteric veins along with the splenic vein. Each of these veins has a unique role. The superior mesenteric vein is...
At its core, the hepatic portal vein is the result of a confluence of the superior and inferior mesenteric veins along with the splenic vein. Each of these veins has a unique role. The superior mesenteric vein is...
5.3K
Transcellular Transport of Solutes
4.6K
Transcellular transport of solutes is the movement of substances like monosaccharides and amino acids through polarized cells. This transport mechanism is primarily seen in epithelial and endothelial cells aided by membrane transport proteins such as channels and transporters. The tight junctions between these cells confine the membrane proteins to the two sides of the cell. The epithelial cells have distinct apical and basolateral domains. In contrast, the endothelial cells show the luminal...
4.6K
Metabolic States of the Body: The Absorptive State
1.3K
During the absorptive state, which lasts approximately four hours after a meal, the body absorbs nutrients from the gastrointestinal tract. The carbohydrates, proteins, and lipids we consume are broken down into monosaccharides, amino acids, and free fatty acids for absorption. While carbohydrates and proteins are absorbed as-is, lipids are absorbed in their broken-down forms and then re-esterified into triglycerides within enterocytes before being packaged into chylomicrons. These absorbed...
1.3K
Secondary Active Transport
136.9K
One example of how cells use the energy contained in electrochemical gradients is demonstrated by glucose transport into cells. The ion vital to this process is sodium (Na+), which is typically present in higher concentrations extracellularly than in the cytosol. Such a concentration difference is due, in part, to the action of an enzyme “pump” embedded in the cellular membrane that actively expels Na+ from a cell. Importantly, as this pump contributes to the high concentration of...
136.9K
