インスリン様成長因子結合タンパク質3(インスリンようせいちょういんしけつごうタンパクしつ3、英:insulin-like growth factor-binding protein 3、IGF結合タンパク質3、IGFBP-3)は、ヒトではIGFBP3遺伝子によってコードされるタンパク質である。IGFBP-3は6種類のインスリン様成長因子結合タンパク質(英語版)(IGFBP-1(英語版)からIGFBP-6(英語版))のうちの1つである。これらは高度に保存された構造を持ち、インスリン長成長因子IGF-1とIGF-2に対して高い親和性で結合する。IGFBP-7もこのファミリーに含まれることがあるが、保存された構造的特徴もIGFに対する高い親和性も持たない。IGFBP-7はIGF-1受容体(IGF1R)に結合してIGF-1とIGF-2の結合を遮断し、アポトーシスをもたらす。
血液循環中のIGFBP-3の主要なリガンドは、IGF-1、IGF-2、そしてALSである。血清タンパク質トランスフェリン、フィブロネクチン、プラスミノーゲンもIGFBP-3に結合することが知られている。細胞内や組織環境ではさらに多くの相互作用が記載されている。LRP1(英語版)(low density lipoprotein receptor-related protein 1)とTMEM219(英語版)という互いに無関係な2つの細胞表面タンパク質がIGFBP-3受容体とされている。LRP1はα2-マクログロブリン受容体、V型TGF-β受容体としても知られている。どちらも抗増殖作用を媒介すると考えられている。EGF受容体、I/II型TGF-β受容体(英語版)との機能的相互作用も報告されており、プロテオグリカンなど他の細胞表面タンパク質もIGFBP-3を結合する。IGFBP-3はクラスリンやカベオリン(英語版)を介したエンドサイトーシスによって細胞内に移行することもあり、おそらくトランスフェリン受容体が関与している。
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関連文献
“Insulin-like growth factor-binding proteins in serum and other biological fluids: regulation and functions”.Endocr. Rev.18(6): 801–31.(1998).doi:10.1210/er.18.6.801.PMID9408744.
“Insulin-like growth factor binding proteins: new proteins, new functions”.Horm. Res.51(2): 53–67.(1999).doi:10.1159/000023315.PMID10352394.
“Role of insulin-like growth factor binding protein-3 in breast cancer cell growth”.Microsc. Res. Tech.59(1): 12–22.(2002).doi:10.1002/jemt.10173.PMID12242693.