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50%,睾丸病理切片显示实验组小鼠精子形成障碍, [6] GENNARINO V A,SINGH R K,WHITE J J,et al. Pum⁃
无长形精子形成,且睾丸生精细胞凋亡增多、增殖 ilio1 haploinsufficiency leads to SCA1⁃like neurodegener⁃
减慢。在实验组成年小鼠中,Pumilio仍然得到了有 ation by increasing wild ⁃ type Ataxin1 levels[J]. Cell,
效敲除,但小鼠及小鼠的精子发生未见明显异常。 2015,160(6):1087-1098
[7] SILVA I L Z,KOHATA A A,SHIGUNOV P. Modulation
说明成年小鼠 Pum1 和 Pum2 的双敲未引起个体明
and function of Pumilio proteins in cancer[J]. Semin Can⁃
显异常,为Pumilio作为肿瘤治疗靶蛋白的研究奠定
cer Biol,2022,86(3):298-309
了实验基础。 [8] GUAN X,CHEN S,LIU Y,et al. PUM1 promotes ovarian
Pumilio 通过不同途径调控多种肿瘤的发生发 cancer proliferation,migration and invasion[J]. Biochem
展,Pum1 和/或 Pum2 在肿瘤细胞中的降低,可影响 Biophys Res Commun,2018,497:313-318
肿瘤的生长,因此降低体内Pumilio表达水平来治疗 [9] DAI H,JIANG Y,LUO Y,et al. Triptolide enhances
TRAIL sensitivity of pancreatic cancer cells by activating
肿瘤疾病是一种理论可行的手段。然而,Pumilio
在哺乳动物多组织器官中表达,降低 Pumilio 表达 autophagy via downregulation of PUM1[J]. Phytomedi⁃
cine,2019,62:152953
是否影响个体的重要功能仍不清楚。本研究建立
[10] LI X,YANG J,CHEN X,et al. PUM1 represses CDKN1B
了一个出生后他莫昔芬诱导敲除 Pumilio 的小鼠模
translation and contributes to prostate cancer progression
型,为Pumilio作为肿瘤治疗靶蛋白的研究提供了研 [J]. J Biomed Res,2021,35:371-382
究模型和理论基础。 [11] SHI P,ZHANG J,LI X,et al. Long non ⁃ coding RNA
本研究还有很多不足之处,比如敲除效率很难 NORAD inhibition upregulates microRNA ⁃ 323a ⁃ 3p to
继续提高,他莫昔芬诱导性基因敲除系统是一种依 suppress tumorigenesis and development of breast cancer
赖雌激素受体的基因敲除系统,不同脏器中雌激 through the PUM1/eIF2 axis[J]. Cell Cycle,2021,20:
素受体的表达丰度、血流量和敏感程度等存在差 1295-1307
[12] LIU Q,XIN C,CHEN Y,et al. PUM1 Is Overexpressed in
异,因此各脏器呈现出不同程度的基因敲除。但
colon cancer cells with acquired resistance to cetuximab
是本系统中大脑、小脑敲除效率如此低,甚至蛋白
[J]. Front Cell Dev Biol,2021,9:696558
反常上升的现象还是出乎预料的,其他研究发现
[13] DING Y,YUAN X,GU W. Circular RNA RBM33 contrib⁃
R26⁃CreER 敲除系统能够顺利敲除大脑中的相关 utes to cervical cancer progression via modulation of the
T2
基因 [18] ,这提示Pum1在大脑中可能具有特殊性,靠 miR⁃758⁃3p/PUM2 axis[J]. J Mol Histol,2021,52:173-
腹腔注射难以得到大脑中稳定且高效的敲除。 185
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