関連する実験動画
Updated: Jul 15, 2026

08:25
Transverse Aortic Constriction in Mice
Published on: April 22, 2010
心不全および先天性隔膜欠陥の発達は,内皮酸化窒素合成酵素が欠けているマウスにおいて起こります
Qingping Feng1, Wei Song, Xiangru Lu
1Department of Medicine, London Health Sciences Centre, London, Ontario, Canada. qfeng@uwo.ca
Circulation
|August 15, 2002
まとめ
腸内酸化窒素合成酵素 (eNOS) 欠乏症は,マウスの死亡率増加と先天性心不全 (隔膜欠陥を含む) を引き起こす. これは,心臓発達の過程で心筋細胞アポトーシスの増加と関連しています.
科学分野:
- 心血管生物学 心血管生物学
- 発達生物学 発達生物学とは
- 分子心臓病学 分子心臓病学
背景:
- 内皮の窒素酸化物合成酵素 (eNOS) は,細胞成長,アポトーシス,組織 perfusion を調節するために不可欠です.
- 以前の研究では,eNOS欠乏したマウスは,異常な大動脈双弁を示していた.
- 心臓の発達におけるeNOSの役割については,さらなる調査が必要です.
研究 の 目的:
- 心臓発育におけるeNOSの役割を調査する.
- eNOS欠乏が心臓機能と生存に与える影響を評価する.
主な方法:
- 産後死亡率,心臓機能,膜欠陥の検査 eNOS(-/-), eNOS(+/-),および野生型のマウス.
- 心臓の縮小を測定するために超音波結晶を使用しました.
- 評価された心筋細胞アポプトーシスと,胚および新生児段階でのカスパース-3活性.
主要な成果:
- 野生型 (13.3%) と比較して,ENOS(-/-) (85.1%) とENOS(+/-) (38.3%) のマウスの産後死亡率が著しく増加しました.
- eNOS欠乏したマウスでは重度の肺詰まりと心臓の縮小の減少が見られました.
- 野生型 (4.9%) と比較して eNOS(-/-) (75%) と eNOS(+/-) (32.4%) の新生児における心房と心室隔膜の欠陥の有意な増加を示した.
- eNOS(-/-) の胚および新生児における心筋細胞アポトーシスおよびカスパース-3活性の増加が観察されました.
結論:
- eNOS欠乏症は,心臓発作中の心不全と先天性隔膜欠陥を引き起こす.
- 心筋細胞アポトーシスの増加は,eNOS欠乏症と心臓異常と関連しています.
- eNOSは,正常な心臓の発達に不可欠です.
関連する概念動画
Mismatch Repair
Overview
Protein Import into the Peroxisomes
Cells contain membrane-bound organelles called peroxisomes that oxidize organic molecules by transferring hydrogen atoms to oxygen, producing hydrogen peroxide. Peroxisomes enzymatically convert the released hydrogen peroxide into water and oxygen.
Peroxisomal Protein Import:
Peroxisomes lack the genetic machinery required to code for their own proteins. Hence, most peroxisomal membrane, lumenal and transmembrane proteins are synthesized in the cytoplasm or ER and transported to the peroxisome...
Peroxisomal Protein Import:
Peroxisomes lack the genetic machinery required to code for their own proteins. Hence, most peroxisomal membrane, lumenal and transmembrane proteins are synthesized in the cytoplasm or ER and transported to the peroxisome...
Mismatch Repair
Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
Unrenewable Cells
In humans, the photoreceptor cells of the eye and sensory hair cells of the ear lack stem cells. These cells are thus unrenewable and cannot be replaced when they are damaged or destroyed.
Photoreceptors
The retina is composed of several layers and contains specialized cells called photoreceptors. The photoreceptors (rods and cones) change their membrane potential when stimulated by light energy. There are two types of photoreceptors—rods and cones—which differ in the shape of their outer...
Photoreceptors
The retina is composed of several layers and contains specialized cells called photoreceptors. The photoreceptors (rods and cones) change their membrane potential when stimulated by light energy. There are two types of photoreceptors—rods and cones—which differ in the shape of their outer...
Photoreceptors and Visual Pathways
At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
Microbiome of the Eye
The human eye has a specialized microbiota that reflects its unique anatomical and immunological environment. This low-biomass microbial community predominantly colonizes the conjunctiva and eyelid margins, playing a vital role in ocular surface homeostasis and defense. Despite its proximity to the richly colonized facial skin, the ocular surface maintains a distinct microbial profile due to continuous mechanical and biochemical defense mechanisms.The conjunctival surface hosts fewer microbial...

