デュシェンヌ筋縮症:筋肉細胞表面におけるディストロフィン欠乏症
E Bonilla1, C E Samitt, A F Miranda
1Department of Neurology, College of Physicians and Surgeons of Columbia University, New York, New York.
Cell
|August 12, 1988
まとめ
ディストロフィンタンパク質は,健康な個体とは異なり,ダッチェンヌ筋縮症 (DMD) 患者には存在しないが,筋肉繊維膜に含まれている. この欠乏は,DMDにおける筋肉表面膜異常と関連している.
科学分野:
- バイオケミストリー バイオケミストリー
- 遺伝学 遺伝学とは
- 神経学 神経学とは
背景:
- デュシェンヌ筋縮症 (DMD) は,進行的な筋肉変性によって特徴づけられる遺伝疾患です.
- ディストロフィン遺伝子の産物は,DMDで変化することが知られている.
- ディストロフィンの局所化を理解することは,DMDの診断と潜在的治療に不可欠です.
研究 の 目的:
- ヒトの筋肉組織内のディストロフィンタンパク質の正確な局所を調査する.
- 正常な筋肉,他の骨髄病,およびドゥシェンヌ筋縮症におけるディストロフィン分布を比較する.
主な方法:
- ディストロフィンに特異的なポリクローン抗体を用いた免疫ヒストロケミカルテクニックが採用されました.
- ヒトの筋肉サンプルを,正常な個人,DMD患者,および他の筋病の患者から分析した.
主要な成果:
- ディストロフィンは,正常な個体の筋肉繊維のサルコレマに一貫して局在していました.
- DMD以外のミオパシーの患者では,ディストロフィンも正常なサルコレマの局所化を示した.
- ディストロフィンタンパク質は,DMD患者からの筋肉サンプルに欠けているか,または深刻な欠陥があることが判明しました.
結論:
- サルコレマにおけるディストロフィン欠乏または欠乏は,ドゥシェンヌ筋縮症の重要な特徴である.
- これらの発見は,ディストロフィン変化による筋肉表面膜の構造的および機能的異常がDMDを含むという仮説を支持する.
関連する概念動画
Formation of Muscle Fibers from Myoblasts
5.8K
De novo myogenesis, or the formation of muscle fibers, begins during the early embryonic stages. The skeletal muscle is formed from somites– blocks of embryonic cell layers. The somites are further divided into dermatomes, myotomes, sclerotomes, and syndetomes. Among these, the myotomes give rise to muscle fibers.
Muscle progenitor cells (MPCs) are formed from the myotomes. MPCs express genes that encode the transcription factors Pax3 and Pax7. Along with Pax 3/7, other transcription...
Muscle progenitor cells (MPCs) are formed from the myotomes. MPCs express genes that encode the transcription factors Pax3 and Pax7. Along with Pax 3/7, other transcription...
5.8K
Satellite Stem Cells and Muscular Dystrophy
1.7K
Satellite stem cells or myosatellite cells are quiescent stem cells that Alexander Mauro first identified in 1961. These cells are located between the sarcolemma, the plasma membrane of muscle fibers, and the basal lamina, the connective tissue sheath covering it. These mononucleated cells are activated in response to muscle injury, can transform into myoblasts, and may form or repair muscle fibers. Myosatellite cells can provide additional myonuclei for muscle regeneration or return to a...
1.7K
Desmosomes
7.5K
The term desmosome derives from the Greek words "desmo" and "soma" meaning "adhesion bodies." This structure was first observed during the late 1800s and described as small, dense nodules in the epidermis. Desmosomes are button-like structures that help form an interlinked network of intermediate filaments across the cells. These junctions are essential to hold cells together under mechanical stress and to maintain tissue integrity. Desmosomes are multi-protein...
7.5K
Disorders of the Skeletal Muscle
2.2K
The clinical conditions affecting the skeletal muscle tissue are broadly categorized as musculoskeletal and neuromuscular disorders.
Musculoskeletal disorders
Musculoskeletal disorders involve injuries and conditions affecting the skeletal muscles and associated connective tissues. These disorders can arise from acute biomechanical stresses or chronic overuse and can occur across different age groups. Common injuries include sprains, fractures, and muscular strains, often resulting from...
Musculoskeletal disorders
Musculoskeletal disorders involve injuries and conditions affecting the skeletal muscles and associated connective tissues. These disorders can arise from acute biomechanical stresses or chronic overuse and can occur across different age groups. Common injuries include sprains, fractures, and muscular strains, often resulting from...
2.2K
Overview of Protein Metabolism
4.5K
Proteins are broken down into amino acids during digestion. Unlike fats and carbohydrates, which are stored for later use, proteins are not. Instead, amino acids are either used to produce ATP through oxidation or contribute to the creation of new proteins for the growth and repair of the body. Any surplus amino acids from the diet are converted into glucose or triglycerides rather than excreted.
Amino acids play various roles in the body once they are absorbed into cells. They are restructured...
Amino acids play various roles in the body once they are absorbed into cells. They are restructured...
4.5K
Healing II: Complications
37
Complications during healing arise when tissue repair is altered by local or systemic factors. These changes involve abnormal collagen deposition, altered biomechanics, and reduced vascular supply, impairing restoration of normal structure and function.Loss of FunctionScar tissue differs significantly from the original tissue it replaces. In the skin, fibrosis lacks adnexal structures such as hair follicles, sebaceous glands, and sweat glands. Their absence reduces tactile sensitivity, impairs...
37


