KSHVのLANAタンパク質によるp53抑制は,細胞死から保護する
J Friborg1, W Kong, M O Hottiger
1Vaccine Research Center, National Institutes of Health, Bethesda, Maryland 20892, USA.
Nature
|January 6, 2000
まとめ
カポシのサルコマ関連ヘルペスウイルス (KSHV) の潜伏タンパク質LANAは,腫瘍抑制剤p53.3と相互作用し,それを抑制する. この相互作用は細胞生存を促進し,KSHVの持続性とカポシ肉腫の腫瘍発生に寄与します.
科学分野:
- ウイルス学 ウイルス学 ウイルス学
- 腫瘍学 腫瘍学
- 分子生物学は分子生物学である.
背景:
- カポシ・サーコマ関連ヘルペスウイルス (KSHV) は,カポシ・サーコマ (KS) とB細胞リンパ増殖性疾患を誘発する.
- ウイルスの潜伏,特に潜伏関連核抗原 (LANA) の発現は,これらの悪性腫瘍の特徴です.
- p53は,細胞成長,細胞サイクル停止,アポトーシスを調節する重要な腫瘍抑制剤です.
研究 の 目的:
- KSHV LANAとヒト腫瘍抑制剤p53.3の相互作用を調査する.
- LANAがp53活性に結合する機能的影響を決定する.
- ウイルスの持続性および腫瘍発生におけるLANAの役割を明らかにする.
主な方法:
- LANA-p53相互作用を証明する共免疫プレシピテーションアッセージ.
- レポーター遺伝子解析は,p53の転写活動を評価する.
- 細胞活力アッセイは,p53媒介によるアポトーシス抑制を評価するためのものです.
主要な成果:
- KSHV LANAとp53.3の間の直接的な相互作用が実証されました.
- LANAがp53.3の転写活動を抑制することを示した.
- LANAがp53誘発のアポトーシスを阻害し,細胞の生存を促進することを確認しました.
結論:
- LANAはp53の機能を活性的に調節し,腫瘍抑制活動を抑制します.
- LANAとp53の相互作用は,ウイルス主導の腫瘍形成とKSの持続に寄与する.
- LANA-p53の相互作用をターゲットにすることで,KSHVに関連した悪性腫瘍の治療戦略を提供することができます.
関連する概念動画
01:23Negative Regulator Molecules
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
02:36DNA Damage can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
02:23Abnormal 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...
01:12Loss of Tumor Suppressor Gene Functions
Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
02:36DNA Damage Can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
01:28Cells of the Innate Immune Response
The innate immune response is an immediate and non-specific response against pathogens, acting swiftly to prevent the spread of infections. The primary cells involved in this response are phagocytes and natural killer (NK) cells.
Phagocytes
Phagocytes police the peripheral tissues by removing cellular debris and responding to the invasion of foreign substances or pathogens. Many phagocytes attack and remove microorganisms even before lymphocytes detect them. The human body has two general...
Phagocytes
Phagocytes police the peripheral tissues by removing cellular debris and responding to the invasion of foreign substances or pathogens. Many phagocytes attack and remove microorganisms even before lymphocytes detect them. The human body has two general...