乳がん腫瘍におけるSPCA2によるOrai1のストア独立活性化
Mingye Feng1, Desma M Grice, Helen M Faddy
1Department of Physiology, School of Medicine, The Johns Hopkins University, Baltimore, MD 21205, USA.
Cell
|October 5, 2010
まとめ
分泌経路Ca2+) -ATPase 2 (SPCA2) のアップレギュレーションは,Orai1.1経由でカルシウム流入を増やすことで乳がんを促進する. SPCA2を抑制すると,カルシウムレベルと腫瘍の成長が低下し,新たな腫瘍発生経路が明らかになる.
科学分野:
- バイオケミストリー バイオケミストリー
- 細胞生物学 細胞生物学
- がん研究 がん研究
背景:
- カルシウムイオン (Ca2+) は,細胞プロセスを調節する重要な第2伝達物質である.
- 変異した細胞溶液Ca2+ダイナミクスは,腫瘍発生に関与し,運動性,増殖,アポトーシスに影響を与えます.
研究 の 目的:
- 乳がんにおける分泌経路Ca2+-ATPase 2 (SPCA2) の役割を調査する.
- SPCA2がカルシウムシグナル伝達と腫瘍発生性を影響するメカニズムを解明する.
主な方法:
- 乳がん細胞および腫瘍におけるSPCA2発現の分析.
- SPCA2抑制がCa2+レベルと腫瘍発生性に与える影響を評価するための機能分析.
- SPCA2と倉庫で運行されるCa2+チャネルOrai1.1.の相互作用の調査
主要な成果:
- SPCA2は乳がん細胞と腫瘍で上調される.
- SPCA2抑制は基礎Ca2+レベルを低下させ,腫瘍発生性を弱める.
- SPCA2は,ER Ca2+貯蔵庫とSTIMタンパク質とは無関係に,Orai1を通じたCa2+の流れを強化する.
- SPCA2のN端がOrai1と結合すると,Ca2+流入が活性化されます.
結論:
- SPCA2-Orai1複合体は,腫瘍発生を促進する新しいシグナル伝達経路を形成します.
- この経路には,構成的,貯蔵独立のCa2+シグナル伝達が含まれています.
- SPCA2-Orai1の相互作用をターゲットにすることで,乳がんの治療戦略を提供することができる.
関連する概念動画
mTOR Signaling and Cancer Progression
The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
The mTOR pathway or the...
mTOR Signaling and Cancer Progression
The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
The mTOR pathway or the...
PI3K/mTOR/AKT Signaling Pathway
The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a rapamycin-insensitive companion...
Induced Pluripotent Stem Cells
Stem cells are undifferentiated cells that divide and produce different cell types. Ordinarily, cells that have differentiated into a specific cell type are terminally differentiated; however, scientists have found a way to reprogram these mature cells so that they dedifferentiate and return to an unspecialized, proliferative state. These cells are pluripotent like embryonic stem cells—able to produce all cell types—and are called induced pluripotent stem cells (iPSCs).
Somatic cells are...
Somatic cells are...
Abnormal Proliferation
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...
MAPK Signaling Cascades
Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...


