骨髄由来エピテリアの発達のための融合要求の欠如
Robert G Harris1, Erica L Herzog, Emanuela M Bruscia
1Department of Laboratory Medicine, Yale University School of Medicine, New Haven, CT 06520, USA.
まとめ
骨髄由来細胞 (BMDCs) は,融合することなく上皮細胞に変容することができます. この研究では,マウスの遺伝的ラベリングを使用して,複数の臓器の上皮細胞にBMDCの分化を追跡しています.
科学分野:
- 発達生物学 発達生物学とは
- 細胞の可塑性について
- 幹細胞の分化 幹細胞の分化
背景:
- 骨髄由来細胞 (BMDCs) の発達の可塑性を調査することは,組織再生と修復を理解するために極めて重要です.
- 細胞-細胞融合の可能性は,BMDCの分化経路の正確な分析を複雑にする.
- 核融合の出来事から真の差別化を区別することは,信頼できる研究結果のために不可欠です.
研究 の 目的:
- 骨髄由来細胞 (BMDCs) が上皮細胞に微分化できることを実証する.
- この分化が細胞融合とは無関係に起こっていることを確認するために.
- BMDC由来の上皮細胞が見つかる特定の臓器を特定する.
主な方法:
- 系統追跡のために,トランスジェニックマウスのCre/lox遺伝システムを利用しました.
- レポーター遺伝子としてβ-ガラクトシダゼと強化緑色光タンパク質 (eGFP) を採用した.
- 様々な組織で生じる上皮細胞を特定するためにBMDCの運命を追跡した.
主要な成果:
- 皮質細胞は,骨髄由来細胞から直接発達することが確認されました.
- この発達プロセスは細胞融合を含まないという証拠を提供した.
- 実験用マウスの肺,肝,皮膚におけるBMDC由来の上皮細胞を特定した.
結論:
- 骨髄に由来する細胞は,表 epithelial 系統に差異化する能力を有しています.
- 細胞融合を必要とせずに,BMDCsの表皮細胞への分化が起こります.
- この発見は再生医療と細胞の可塑性を理解する上で重要な意味を持つ.
関連する概念動画
Connective Tissue Cell Types
Connective tissue develops from the mesoderm of a developing embryo and consists of cells, fibers, and ground substance: a gel-like material containing large complexes of carbohydrates and proteins. Connective tissue was first identified as a separate tissue family in the 18th century, and Johannes Peter Muller coined the term connective tissue.
Fat cells (adipocytes), smooth muscle cells (myoblasts), and bone cells (osteoblasts) are some connective tissue cell types. Some immune system cells...
Fat cells (adipocytes), smooth muscle cells (myoblasts), and bone cells (osteoblasts) are some connective tissue cell types. Some immune system cells...
Growth of Cartilage and Bone Tissue
Chondrocytes form a temporary cartilaginous model by dividing and secreting a thick gel-like extracellular matrix. Once the chondrocytes undergo programmed cell death, osteoblasts enter the site of the cartilaginous model. The process of replacing the temporary cartilaginous model with bone in an ordered manner is called endochondral ossification. In endochondral ossification, not all of the cartilage is replaced by bone tissue. Some cartilage that performs a protective and supportive function...
Type IV Collagen of Basal Lamina
Type IV collagen is a 400 nm long, network-forming collagen that acts as a barrier between the epithelial and endothelial cells. Type IV collagen forms the backbone of the basement membrane by scaffolding with laminin, entactin, proteoglycans, and fibronectin. Apart from rendering structural support to the basement membrane, it also helps entail signaling potentials necessary for both pathological and physiological functions.
A type IV collagen molecule has six alpha chains which can exist in...
A type IV collagen molecule has six alpha chains which can exist in...
Bone as Supporting Connective Tissue
Bone tissue forms the internal skeleton of vertebrate animals, providing structure to the body.
Bone Matrix
Bone, or osseous tissue, is a connective tissue that has a large amount of two different types of matrix material. The organic matrix is similar to the matrix material found in other connective tissues, including some amount of collagen and elastic fibers. This gives strength and flexibility to the tissue. The inorganic matrix consists of mineral salts— mostly calcium salts— that give the...
Bone Matrix
Bone, or osseous tissue, is a connective tissue that has a large amount of two different types of matrix material. The organic matrix is similar to the matrix material found in other connective tissues, including some amount of collagen and elastic fibers. This gives strength and flexibility to the tissue. The inorganic matrix consists of mineral salts— mostly calcium salts— that give the...
Bone Formation by Intramembranous Ossification
Intramembranous ossification is one of the two processes involved in the development of bones within an embryo. The flat bones of the face, most of the cranial bones, and the clavicles are formed via this process. During intramembranous ossification, the bones develop directly from sheets of undifferentiated mesenchymal connective tissue.
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into...
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into...
Bone Disorders
Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...


