紫外線が誘発する炎症は,メラノーマの血管新生と転移を促進します
Tobias Bald1, Thomas Quast2, Jennifer Landsberg1
1Laboratory of Experimental Dermatology, Department of Dermatology and Allergy, University of Bonn, 53115 Bonn, Germany.
Nature
|February 28, 2014
まとめ
繰り返される紫外線 (UV) 曝露は,炎症を誘発することによってメラノーマの転移を促進します. このUV誘発の炎症は,血管に沿ったメラノーマ細胞の侵入を高め,DNA損傷とは無関係に肺転移を増加させます.
科学分野:
- 腫瘍学 腫瘍学
- 免疫学 免疫学とは
- 皮膚科 皮膚科について
背景:
- 断続的な強い紫外線 (UV) 放射線は,主にDNA変異を通して,メラノーマの既知の原因です.
- メラノーマの病原性に対する紫外線放射の微環境効果の影響は,まだ完全に理解されていません.
研究 の 目的:
- 繰り返される紫外線曝露が,腫瘍を誘発するDNA損傷とは無関係にメラノーマの転移にどのように影響するかを調査する.
- 紫外線がメラノーマの進行を促す微環境的メカニズムを解明する.
主な方法:
- 原発性皮膚性メラノーマの遺伝子組み換えマウスモデルを使用した.
- 転移の進行および関連する細胞および分子の変化を評価するために,繰り返しUV照射を受けた.
- 紫外線誘発性メラノーマ転移における中性粒子の役割,高移動性グループボックス1 (HMGB1) およびトール型受容体4 (TLR4) を調査した.
主要な成果:
- 繰り返される紫外線曝露は,血管に沿ったメラノーマ細胞の拡大を高め,肺転移を増加させた.
- この転移性増強は,HMGB1とTLR4によって媒介されるUV誘発性中性粒子の徴募と活性化に依存していた.
- 紫外線照射は血管新生を刺激し,メラノーマ細胞の内皮細胞への移住を促し,周周血管の侵入 (血管性) を引き起こした.
結論:
- ケラチノサイト由来のHMGB1とTLR4経由の中性粒子の活性化によって媒介されるUV誘発の炎症は,メラノーマの転移を誘発する.
- 血管周侵襲のメカニズムであるアニオトロピズムは,UV放射線によって促進され,メラノーマの拡散に寄与する.
- 炎症誘発のメラノーマ細胞の可塑性と内皮細胞の相互作用をターゲットにすることで,転移を抑制する合理的な戦略が提供されます.
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