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Effects of the omega-3 fatty acid DHA on histone and p53 acetylation in diffuse large B cell lymphoma.
Biochemistry and Cell Biology ( IF 2.9 ) Pub Date : 2023-01-04 , DOI: 10.1139/bcb-2022-0288
Tanner J Bakhshi 1 , Tanner Way 1 , Bradley Muncy 2 , Philippe T Georgel 1, 3
Affiliation  

Diffuse large B cell lymphoma (DLBCL) often develops resistance and/or relapses in response to immunochemotherapy. Epigenetic modifiers are frequently mutated in DLBCL, i.e., the lysine (histone) acetyltransferases CREBBP and EP300. Mutations in CBP/p300 can prevent the proper acetylation and activation of (i) enhancer sequences of genes required for essential functions (e.g., germinal center exit and differentiation) and (ii) the tumor suppressor p53. Based on evidence that omega-3 fatty acids (ω-3 FAs) affect histone acetylation in various cancers, we investigated whether ω-3 FA docosahexaenoic acid (DHA) could modify levels of histone and p53 acetylation in three DLBCL cell lines (at different CREBBP/EP300 mutational status) versus normal B cells. Exposure to DHA at clinically attainable doses was shown to significantly alter the genome-wide levels of histone posttranslational modifications in a cell-line-dependent and dose-dependent manner. Although histone acetylation did not increase uniformly, as initially expected, levels of p53 acetylation increased consistently. Quantitative reverse transcription polymerase chain reaction results revealed significant changes in expression of multiple genes, including increased expression of CREBBP and of PRDM1 (required for differentiation into plasma cells or memory B cells). Taken together, our results provide (to our knowledge) the first characterization of the epigenetic effects of ω-3 FAs in DLBCL.

中文翻译:

omega-3 脂肪酸 DHA 对弥漫性大 B 细胞淋巴瘤组蛋白和 p53 乙酰化的影响。

弥漫性大 B 细胞淋巴瘤 (DLBCL) 通常会因免疫化疗而产生耐药性和/或复发。表观遗传修饰剂在 DLBCL 中经常发生突变,即赖氨酸(组蛋白)乙酰转移酶 CREBBP 和 EP300。CBP/p300 中的突变可以阻止 (i) 基本功能所需基因的增强子序列(例如,生发中心退出和分化)和 (ii) 肿瘤抑制因子 p53 的适当乙酰化和激活。基于 omega-3 脂肪酸 (ω-3 FAs) 影响各种癌症中组蛋白乙酰化的证据,我们研究了 ω-3 FA 二十二碳六烯酸 (DHA) 是否可以改变三种 DLBCL 细胞系(在不同条件下)的组蛋白和 p53 乙酰化水平CREBBP/EP300 突变状态)与正常 B 细胞。以临床可达到的剂量暴露于 DHA 显示以细胞系依赖性和剂量依赖性方式显着改变组蛋白翻译后修饰的全基因组水平。尽管组蛋白乙酰化并未像最初预期的那样均匀增加,但 p53 乙酰化水平持续增加。定量逆转录聚合酶链反应结果揭示了多个基因表达的显着变化,包括 CREBBP 和 PRDM1(分化为浆细胞或记忆 B 细胞所需)的表达增加。综上所述,我们的结果(据我们所知)首次表征了 DLBCL 中 ω-3 FA 的表观遗传效应。尽管组蛋白乙酰化并未像最初预期的那样均匀增加,但 p53 乙酰化水平持续增加。定量逆转录聚合酶链反应结果揭示了多个基因表达的显着变化,包括 CREBBP 和 PRDM1(分化为浆细胞或记忆 B 细胞所需)的表达增加。综上所述,我们的结果(据我们所知)首次表征了 DLBCL 中 ω-3 FA 的表观遗传效应。尽管组蛋白乙酰化并未像最初预期的那样均匀增加,但 p53 乙酰化水平持续增加。定量逆转录聚合酶链反应结果揭示了多个基因表达的显着变化,包括 CREBBP 和 PRDM1(分化为浆细胞或记忆 B 细胞所需)的表达增加。综上所述,我们的结果(据我们所知)首次表征了 DLBCL 中 ω-3 FA 的表观遗传效应。
更新日期:2023-01-04
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