3013 – LEDGF/P75 PLAYS OPPOSING ROLES IN CHEMORESISTANCE IN DIFFERENT LEUKEMIAS

IF 2.5 4区 医学 Q2 HEMATOLOGY
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引用次数: 0

Abstract

Lens Epithelium Derived Growth Factor/p75 (LEDGF/p75) is a chromatin-associated protein involved in multiple malignancies. It tethers the MLL/KMT2A fusion protein to the chromatin and plays a critical role in the initiation and maintenance of MLL-r leukemia which mostly affects pediatric patients and is linked to a high rate of relapse and resistance to conventional chemotherapy. Moreover, LEDGF/p75 is overexpressed in AML and prostate cancer patients who are resistant to chemotherapy. We have previously shown that reduced LEDGF/p75 expression sensitizes proliferation and survival of KMT2A-r Thp1 cells to cytarabine treatment through the sphingosine-1 pathway. Here, we studied modulation of chemoresistance by LEDGF/p75 in various types of leukemia. At first, we corroborated the results in Thp1 and expanded these findings by ectopically expressing LEDGF/p75 in the KMT2A-r Molm13 cells that naturally express low levels of LEDGF/p75. Overexpression of LEDGF/p75 in those cells resulted in increased proliferation and reduced apoptosis in the presence of cytarabine. A similar result was obtained after LEDGF/p75 depletion in K562 (CML, KMT2A WT) since a 3-fold increase in sensitivity to vincristine compared to the control was found. Vincristine treated K562 LEDGF/p75 KD cells show more apoptosis and increased caspase3 expression. Interestingly, LEDGF/p75 depletion in SEM cells (ALL, KMT2A-r) resulted in 4-fold more proliferation and less apoptosis upon cytarabine treatment compared to cells expressing mock miRNA. In conclusion, LEDGF/p75 induces chemoresistance in Thp1 and K562 cells to cytarabine and vincristine respectively but sensitizes SEM cells to cytarabine. Our findings highlight the opposing role of LEDGF/p75 in modulating chemoresistance across leukemias. Targeting LEDGF/p75 may be a promising strategy to enhance chemotherapy efficacy in specific leukemic subtypes.

3013 - ledgf/p75 在不同白血病的化疗耐药性中发挥着相反的作用
晶状体上皮细胞衍生生长因子/p75(LEDGF/p75)是一种与多种恶性肿瘤有关的染色质相关蛋白。它将 MLL/KMT2A 融合蛋白拴在染色质上,在 MLL-r 白血病的发生和维持过程中起着关键作用。此外,LEDGF/p75 在对化疗产生抗药性的急性髓细胞白血病和前列腺癌患者中过度表达。我们之前已经证明,LEDGF/p75 的表达减少会通过鞘氨醇-1 途径使 KMT2A-r Thp1 细胞的增殖和存活对阿糖胞苷治疗敏感。在此,我们研究了 LEDGF/p75 在多种类型白血病中对化疗耐药性的调节作用。首先,我们证实了在Thp1中的结果,并通过在自然表达低水平LEDGF/p75的KMT2A-r Molm13细胞中异位表达LEDGF/p75来扩展这些发现。在这些细胞中过表达 LEDGF/p75 会导致细胞增殖增加,并在存在阿糖胞苷的情况下减少细胞凋亡。在 K562(CML,KMT2A WT)中去除了 LEDGF/p75,也得到了类似的结果,因为与对照组相比,对长春新碱的敏感性增加了 3 倍。经长春新碱处理的 K562 LEDGF/p75 KD 细胞凋亡更多,caspase3 表达增加。有趣的是,与表达模拟 miRNA 的细胞相比,在 SEM 细胞(ALL、KMT2A-r)中去除了 LEDGF/p75,细胞在接受阿糖胞苷处理时增殖增加 4 倍,凋亡减少。总之,LEDGF/p75分别诱导Thp1和K562细胞对阿糖胞苷和长春新碱产生化疗耐药性,但使SEM细胞对阿糖胞苷敏感。我们的研究结果突显了LEDGF/p75在调节白血病化疗耐药性中的相反作用。靶向LEDGF/p75可能是提高特定白血病亚型化疗疗效的一种有前途的策略。
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来源期刊
Experimental hematology
Experimental hematology 医学-血液学
CiteScore
5.30
自引率
0.00%
发文量
84
审稿时长
58 days
期刊介绍: Experimental Hematology publishes new findings, methodologies, reviews and perspectives in all areas of hematology and immune cell formation on a monthly basis that may include Special Issues on particular topics of current interest. The overall goal is to report new insights into how normal blood cells are produced, how their production is normally regulated, mechanisms that contribute to hematological diseases and new approaches to their treatment. Specific topics may include relevant developmental and aging processes, stem cell biology, analyses of intrinsic and extrinsic regulatory mechanisms, in vitro behavior of primary cells, clonal tracking, molecular and omics analyses, metabolism, epigenetics, bioengineering approaches, studies in model organisms, novel clinical observations, transplantation biology and new therapeutic avenues.
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