白血病抑制因子
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白血病抑制因子(Leukemia inhibitory factor,縮寫 LIF)是一種屬於白介素-6大類的細胞因子。它能通過抑制分化影響細胞生長。LIF水平下降會使細胞開始分化。
功能
編輯白血病抑制因子能夠誘導骨髓性白血病細胞的末端分化,進而阻止其生長,因而得名。白血病抑制因子還有以下功能:能促進多種細胞的生長與分化,影響骨代謝、惡病質體、神經發育,胚胎發育以及炎症作用。受p53調控的白血病抑制因子能促進小鼠和人的胚胎著床[1]。一篇文章提出重組人白血病抑制因子可能可以提高意外懷孕的婦女(體內胚胎)的著床成功率[2]。
表達
編輯LIF在正常情況下會由囊胚中的滋養層(TE)表達,而其受體LIFR則會由內細胞群(ICM)的細胞表達。胚胎幹細胞取自內細胞群的細胞,在體外培養時就需要額外補充LIF。目前,重組LIF已可以通過基因工程的手段由植物(水稻)產生[3]。
幹細胞培養
編輯幹細胞培養基中大都含有LIF,可用於替代餵養層(feeder layer)細胞,因爲餵養層細胞的主要作用即產生LIF。不表達LIF基因的餵養層細胞難以支持幹細胞的培養[4]。LIF通過招募信號誘導分子以及轉錄激活因子3(STAT3)促進細胞的自我更新。活化的LIFR能徵募Stat3。隨後,JAK激酶能將其磷酸化。不過LIF和Stat3是不足以阻止細胞分化的,一旦移去培養基中的血清,幹細胞就會分化。在原生多能性幹細胞分化的可逆階段,加入LIF可以使細胞重回原生多能性階段[5][6][7]。
參考
編輯- ^ Wenwei Hu, Zhaohui Feng, Angelika K. Teresky1, Arnold J. Levine. p53 regulates maternal reproduction through LIF. Nature. November 29, 2007, 450 (7170): 721–724 [2017-01-27]. PMID 18046411. doi:10.1038/nature05993. (原始內容存檔於2017-03-15).
- ^ Aghajanova, L. Leukemia inhibitory factor and human embryo implantation. Annals of the New York Academy of Sciences. 2004, 1034: 176–83. PMID 15731310. doi:10.1196/annals.1335.020.
- ^ Bradford A. Youngblood; et al. Application of recombinant human leukemia inhibitory factor (LIF) produced in rice (Oryza sativa L.) for maintenance of mouse embryonic stem cells. Journal of Biotechnology Volume 172. 2014-02-20: 67–72.
- ^ Stewart, C. L.; Kaspar, P; Brunet, L. J.; Bhatt, H; Gadi, I; Köntgen, F; Abbondanzo, S. J. Blastocyst implantation depends on maternal expression of leukaemia inhibitory factor. Nature. 1992, 359 (6390): 76–9. PMID 1522892. doi:10.1038/359076a0.
- ^ Martello, Graziano; Smith, Austin. The Nature of Embryonic Stem Cells. Annual Review Cell Developmental Biology. 2014, 30: 647. doi:10.1146/annurev-cellbio-100913-013116.
- ^ Kawahara Y, Manabe T, Matsumoto M, Kajiume T, Matsumoto M, Yuge L. Zwaka, Thomas , 編. LIF-Free Embryonic Stem Cell Culture in Simulated Microgravity. PLoS ONE. 2009, 4 (7): e6343 [2017-01-27]. PMC 2710515 . PMID 19626124. doi:10.1371/journal.pone.0006343. (原始內容存檔於2014-02-22).
- ^ CGS : PTO Finds Stem Cell Patent Anticipated, Obvious in Light of 'Significant Guideposts'. (原始內容存檔於2011-10-04).
拓展閱讀
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- Aghajanova L. Leukemia inhibitory factor and human embryo implantation. Ann. N. Y. Acad. Sci. 2005, 1034: 176–83. PMID 15731310. doi:10.1196/annals.1335.020.
- Králícková M, Síma P, Rokyta Z. Role of the leukemia-inhibitory factor gene mutations in infertile women: the embryo-endometrial cytokine cross talk during implantation--a delicate homeostatic equilibrium. Folia Microbiol. (Praha). 2005, 50 (3): 179–86. PMID 16295654. doi:10.1007/BF02931563.
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- Sutherland GR, Baker E, Hyland VJ; et al. The gene for human leukemia inhibitory factor (LIF) maps to 22q12. Leukemia. 1989, 3 (1): 9–13. PMID 2491897.
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- Aikawa J, Ikeda-Naiki S, Ohgane J; et al. Molecular cloning of rat leukemia inhibitory factor receptor alpha-chain gene and its expression during pregnancy. Biochim. Biophys. Acta. 1997, 1353 (3): 266–76. PMID 9349722.
- Hinds MG, Maurer T, Zhang JG; et al. Solution structure of leukemia inhibitory factor. J. Biol. Chem. 1998, 273 (22): 13738–45. PMID 9593715. doi:10.1074/jbc.273.22.13738.
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參見
編輯外部連結
編輯- 醫學主題詞表(MeSH):Leukemia+Inhibitory+Factor
- Source of Recombiant Leukemia Inhibitory Factor (http://www.invitria.com/cell-culture-products-services/leukemia-inhibitory-factor-culture-media.html (頁面存檔備份,存於網際網路檔案館) )