関連する実験動画
Updated: Jun 14, 2026

11:13
Indirect Immunofluorescence on Frozen Sections of Mouse Mammary Gland
Published on: December 1, 2015
ステロイドホルモンのシグナル伝達による乳がん幹細胞機能の制御
Marie-Liesse Asselin-Labat1, François Vaillant, Julie M Sheridan
1The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria 3052, Australia.
Nature
|April 13, 2010
まとめ
卵巣ホルモンは乳がんのリスクに影響します. マウス乳腺幹細胞 (MaSCs) は,これらのホルモンに反応し,がんの発症に影響を与え,予防戦略のための新しいターゲットを提供します.
科学分野:
- エンドクリノロジー エンドクリノロジー
- 腫瘍学 腫瘍学
- 幹細胞生物学 幹細胞生物学
背景:
- エストロゲンやプロゲステロンなどの卵巣ホルモンは,乳がんのリスクと罹患率に大きな影響を与えます.
- 内分泌療法と卵巣切除は,乳がんの治療法として確立されています.
- ホルモン,妊娠,乳がんのリスクを結びつける細胞メカニズムは,完全に理解されていません.
研究 の 目的:
- ネズミの乳腺幹細胞 (MaSCs) でのステロイドホルモンシグナル伝達の役割を調査する.
- 妊娠に関連した乳がんリスクの細胞基礎を解明する.
- 乳がんの化学予防のターゲットとしてMASCの機能を調査する.
主な方法:
- 異なるホルモン状態 (卵巣切除,ホルモン治療,アロマターゼ抑制) のマウスにおけるMASCの数と機能を研究した.
- 妊娠がMASC群に与える影響を調査した.
- 妊娠によって引き起こされるMASCの変化を媒介するRANKリガンドの役割を評価した.
主要な成果:
- MaSCは,直接受容体がないにもかかわらず,ステロイドホルモンシグナル伝達に反応した.
- 卵巣切除はマスクの数と潜在能力を減少させ,ホルモン治療は増加させた.
- アロマターゼ阻害剤の治療は,MASCプールを減少させた.
- 妊娠は,RANKリガンドを介して,おそらく,MASC数の一時的で有意な増加を引き起こしました.
結論:
- MaSCsは,卵巣ホルモンが乳腺組織に与える影響の主要な媒介者です.
- 妊娠に起因するMSCの増加は,短期的に乳がんのリスクが高くなる細胞学的説明を提供している.
- 潜在的にホルモン抑制を介して,MASC機能をターゲットにすることは,乳がんの化学予防戦略として実行可能である可能性があります.
関連する概念動画
Stem Cell Niche
The stem cell niche is the dynamic microenvironment where stem cells reside. Inside these niches, the cells may remain undifferentiated, undergo high self-renewal, or become lineage-specific progenitors. Stem cells coexist with other niche cells, such as stromal cells. They also interact closely with the ECM. Cell-cell and cell-matrix communication occur via adhesion molecules or soluble factors that signal the stem cells and determine their fate. Stromal cells also provide survival signals to...
Role Of Notch Signalling In Intestinal Stem Cell Renewal
Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
Hedgehog Signaling Pathway
The Hedgehog gene (Hh) was first discovered due to its control of the growth of disorganized, hair-like bristles phenotype in Drosophila, much like hedgehog spines. Hh plays a crucial role in the development of organs and the maintenance of homeostasis in both invertebrates and vertebrates. However, while Drosophila has only one Hh protein, mammals have multiple functional Hedgehog proteins - Sonic (Shh), Desert (Dhh), and Indian Hedgehog (Ihh). All of these homologous proteins have adapted to...
Autocrine Signaling
Autocrine signaling is one of the many signaling mechanisms that function inside multicellular organisms to carry out intercellular communication. In this type of signaling mechanism, the same cell that secretes an extracellular signaling molecule also expresses the receptors to bind and respond to that signaling molecule.
Autocrine Signaling in Macrophages
Under normal physiological conditions, autocrine signaling is essential for maintaining homeostasis. This process is well characterized in...
Autocrine Signaling in Macrophages
Under normal physiological conditions, autocrine signaling is essential for maintaining homeostasis. This process is well characterized in...
The Mammary Glands
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...
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...
Mesenchymal Stem Cells
Mesenchymal stem cells (MSCs) are adult stem cells that can differentiate into most connective tissue cell types, except for hematopoietic cells, depending upon the source of MSCs. For example, bone-marrow-derived MSCs (BM-MSCs) can differentiate into osteocytes, hepatocytes, and pancreatic and neuronal cells. MSCs can be isolated from various sources such as bone marrow, placenta, adipose tissue, teeth, and Wharton’s jelly, a gelatinous substance in the umbilical cord. The ease of their access...

