哺乳類における昼間のタイミングの調整

Steven M Reppert¹, David R Weaver

¹Department of Neurobiology, University of Massachusetts Medical School, LRB-728, 364 Plantation Street, Worcester, Massachusetts 01605, USA. steven.reppert@umassmed.edu

Nature

|August 29, 2002

まとめ

生物学的時間は,24時間スケールで動作する昼夜リズムを持つサイクルで測定されます. 脳内のマスタークロックは,光のシグナルを使用して,身体の組織全体で分子タイミングメカニズムを同期します.

科学分野:

クロノバイオロジーはクロノバイオロジーを用います.
分子生物学は分子生物学である.
神経科学は神経科学である.

背景:

生物学的計時には,ミリ秒から数年までのサイクルが含まれています.
シルカディアンリズムは,よく研究された24時間の生物学的タイムシステムを表しています.
分子メカニズムは,様々な身体組織でこれらのリズムを駆動する.

研究の目的:

生物学的時間測定の基本原理を説明する.
生理学的プロセスにおける昼夜リズムの役割を強調する.
中央脳時計による生物リズムの階層的な制御を記述する.

主な方法:

確立されたクロノバイオロジー研究のレビュー.
異なる組織における分子時計の分析.
脳のマスタークロック機能の調査.

主要な成果:

生物学的時間は,さまざまな周期的なプロセスによって測定されます.
シルカディアンリズムは,複雑な分子機構によって生成されます.
脳内の中心的な昼夜ペースメーカーは,周辺の時計を同期します.

結論:

脳のマスター・クロックは,光の影響を受け,周辺の昼夜リズムをオーケストラ化します.
これらのタイミングシステムを理解することは,生理学にとって極めて重要です.
この階層的な組織は,協調された生物学的機能を保証します.

さらに関連する動画

07:34

Milk Collection Methods for Mice and Reeves' Muntjac Deer

Published on: July 19, 2014

19.8K

04:56

An Efficient Single—Person Technique for Milk Sampling from Laboratory Mice

Published on: March 28, 2025

1.9K

関連する概念動画

01:40

Hormonal Regulation

37.6K

Hormones regulate a significant portion of digestion through activation of the neuroendocrine system. The neuroendocrine system of digestion contains many different hormones all with multiple functions that are both, directly and indirectly, involved in digestion.

37.6K

01:33

Hormonal Regulation

30.4K

The renin-aldosterone system is an endocrine system which guides the renal absorption of water and electrolytes, thus managing blood pressure and osmoregulation. Activation of the system begins in the kidneys with a small cluster of cells adjacent to the afferent and efferent blood vessels of the renal corpuscle. As the nephrons are filtering blood, juxtaglomerular cells monitor blood pressure. If they detect a decrease in pressure, they release the hormone renin into the bloodstream.

30.4K

00:55

Parental Care

11.7K

Many animals exhibit parental care behavior, including feeding, grooming, and protecting young offspring. Parental care is universal in mammals and birds, which often have young that are born relatively helpless. Several species of insects and fish, as well as some amphibians, also care for their young.

11.7K

01:22

Hormonal Regulation of the Menstrual Cycle

2.4K

The ovarian cycle regulates endometrial changes throughout a single menstrual cycle via the coordinated action of gonadotrophin-releasing hormone (GnRH) and gonadotrophins.
At puberty, GnRH begins a pulsatile release pattern, which triggers the anterior pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). The frequency and amplitude of GnRH pulses vary across the menstrual cycle, with faster pulses favoring LH release and slower pulses favoring FSH...

2.4K

01:19

The Menstrual Cycle

7.3K

The menstrual cycle is a recurrent sequence of changes in the uterine endometrium, specifically its functional layer, the stratum functionalis. This cycle prepares the uterus for potential pregnancy. This cycle typically spans 21–35 days, averaging 28 days, and aligns with the ovarian cycle, regulated by fluctuating levels of ovarian hormones, primarily estrogen and progesterone.
The menstrual phase occurs from days 1 to 5 and involves the shedding of the stratum functionalis, as a...

7.3K

01:12

The Mammary Glands

3.2K

The female breast is a hemispheric projection of variable size positioned anterior to the pectoralis major and serratus anterior muscles. A fascia layer composed of dense, irregular connective tissue connects it to these muscles.
Each breast features a pigmented projection known as the nipple, through which milk emerges via closely spaced openings of ducts, referred to as lactiferous ducts. Surrounding the nipple is a circular pigmented area of skin named the areola, which appears rough due to...