EBV-positive Hodgkin lymphoma is associated with suppression of p21cip1/waf1 and a worse prognosis.

EBV-positive Hodgkin lymphoma is associated with suppression of p21cip1/waf1 and a worse prognosis.
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DOI:
10.1186/1476-4598-9-32
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发表时间:
2010-02-09
期刊:
影响因子:
37.3
通讯作者:
Lin CW
Lin CW
中科院分区:
医学1区
文献类型:
--
作者:
Liu TY;Wu SJ;Huang MH;Lo FY;Tsai MH;Tsai CH;Hsu SM;Lin CW

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约 30-50% 的霍奇金淋巴瘤 (HL) 携带 Epstein-Barr 病毒 (EBV),但 EBV 感染对临床结果的影响尚不清楚。 EBV 编码的小 RNA (EBER) 存在于所有 EBV 感染的细胞中,但对其功能仍知之甚少。 EBER1 被转染到两种 HL 细胞系 KMH2 和 L428 中,并使用微阵列来筛选 EBER1 诱导的变化。我们发现 EBER1 抑制 HL 细胞系中 p21cip1/waf1 的转录。此外,p21cip1/waf1 转录的正调节因子(例如 p53、EGR1 和 STAT1)减少。 EBER1+ HL 细胞系中 p21cip1/waf1 的抑制与组蛋白脱乙酰酶抑制剂或蛋白酶体抑制剂的耐药性增加相关,这些药物已知通过增加 p21cip1/waf1 水平导致细胞凋亡。在活检标本上,EBV+ HL 的 p21cip1/waf1 和活性 caspase 3 表达较弱。临床上,EBV+ HL 中 p21cip1/waf1 的抑制与较差的 2 年无病生存率相关(EBV+ HL 为 45%,EBV- HL 为 77%,p = 0.002)。尽管其潜在机制仍相对不清楚,但 EBER1 抑制 p21cip1/waf1 转录,并通过下调 p53、EGR1 和 STAT1 来防止细胞凋亡。 EBER1 的抗凋亡活性可能对于从药物诱导的细胞凋亡中拯救 Reed-Sternberg 细胞以及 EBV+ HL 的临床行为很重要。
About 30-50% of Hodgkin lymphomas (HLs) harbor the Epstein-Barr virus (EBV), but the impact of EBV infection on clinical outcomes has been unclear. EBV-encoded small RNAs (EBERs) are presented in all EBV-infected cells, but their functions are still less understood. EBER1 was transfected into two HL cell lines, KMH2 and L428, and microarrays were used to screen for EBER1-induced changes. We found that EBER1 suppressed p21cip1/waf1 transcription in HL cell lines. In addition, positive regulators of p21cip1/waf1 transcription, such as p53, EGR1, and STAT1, were decreased. Suppression of p21cip1/waf1 in the EBER1+ HL cell lines was associated with increased resistance to histone deacetylase inhibitors or proteasome inhibitors, drugs known to cause apoptosis by increasing p21cip1/waf1 levels. On biopsy specimens, EBV+ HLs had weaker expression of both p21cip1/waf1 and active caspase 3. Clinically, suppression of p21cip1/waf1 in EBV+ HLs was associated with a worse 2-year disease-free survival rate (45% for EBV+ HLs vs. 77% for EBV- HLs, p = 0.002). Although the underlying mechanisms are still relatively unclear, EBER1 inhibits p21cip1/waf1 transcription and prevents apoptosis through down-regulation of p53, EGR1, and STAT1. The anti-apoptotic activity of EBER1 may be important in the rescue of Reed-Sternberg cells from drug-induced apoptosis and in the clinical behaviors of EBV+ HLs.
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