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関連する概念動画

Aging01:26

Aging

801
Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
801
The Effect of Aging on Tissues01:19

The Effect of Aging on Tissues

3.6K
Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
3.6K
Changes in the Appendicular Skeleton with Age01:09

Changes in the Appendicular Skeleton with Age

3.6K
The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
3.6K
Pharmacodynamics in Geriatric Patients: Effects of Age01:27

Pharmacodynamics in Geriatric Patients: Effects of Age

241
Age-related pharmacokinetic changes are extensively documented, but understanding age-related pharmacodynamic alterations is relatively limited. This knowledge gap can be partly attributed to the complexity of developing appropriate measures of drug responses compared to bioanalytical methods for determining drug concentrations.Most information regarding age-related differences in human pharmacodynamics originates from cross-sectional studies. However, these studies assume that observed mean...
241
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption01:22

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption

713
As individuals age, their body's physiology evolves, affecting drug pharmacokinetics. The most apparent changes occur in the gastrointestinal tract, where an increase in gastric pH, a delay in gastric emptying, and a reduction in gastrointestinal motility are observed. Remarkably, these changes do not substantially modify the absorption of orally administered drugs, particularly those absorbed via passive diffusion.Transdermal drug delivery emerges as a highly viable method for older adults due...
713
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution01:00

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution

265
Drug distribution in the human body is influenced by several factors, including plasma protein concentration, body composition, blood flow, tissue-protein concentration, and tissue fluid pH. Among these, changes in plasma protein concentration and body composition due to aging significantly affect how drugs are distributed within the body. Specifically, aging is associated with a decrease in albumin levels by about 10% and an increase in α1-acid glycoprotein levels. These alterations are...
265

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Behavioral Assessment of the Aging Mouse Vestibular System
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老いたマウスの脂質ドーム.

Edgar Esparza, Steven E Pilley, Xuanyi Shi

    bioRxiv : the preprint server for biology
    |February 12, 2026
    PubMed
    まとめ
    この要約は機械生成です。

    老化は,臓器と性別によって,脂質体 (脂肪分子の組成) を異なる形で変化させます. 主な変化は胸腺と筋肉で観察され,マウスの器官特異的な老化パターンを明らかにしました.

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    科学分野:

    • ゲロントロジーはゲロントロジーの学科です.
    • メタボロミクスとは
    • リピドミクスは,リピドミクスのことです.

    背景:

    • 老化は,機能と健康に影響を与える代謝変化と関連しています.
    • 組織と性別における年齢に関連した脂質群の変化に関する既存の研究は不完全である.

    研究 の 目的:

    • マウスの複数の臓器における年齢および性別依存の脂質群変異を包括的にマッピングする.
    • 老化と性により最も影響を受ける特定の脂質クラスと組織を特定する.

    主な方法:

    • 5つの異なる年齢の雄性・雌性マウスから10の臓器にわたる775の脂質を対象とした標的型脂質学分析.
    • 老化中の臓器特異性および性別特異性脂質変化を特定するための比較分析.

    主要な成果:

    • 老化は,臓器特異的な方法で脂質体に影響を及ぼし,胸腺と四頭筋の筋肉が最も重要な変化を示します.
    • 四肢筋は,年齢とともに,特に腎上腺酸を含む,フォスファディチルコレインおよびフォスファディチルエタノアミン脂質の減少を示した.
    • は,性別に依存する脂質の違いを示し,女性には男性よりも低レベルのリソファティディルコレリンとリソファティディルエタノアミンがある.

    結論:

    • この研究は,マウスの臓器における年齢および性別に関連した脂質変化の詳細なアトラスを提供しています.
    • 発見は既存のリソースを補完し,高齢化メカニズムと代謝健康に関するさらなる研究を支援します.