KAT7 promotes radioresistance through upregulating PI3K/AKT signaling in breast cancer.

KAT7 promotes radioresistance through upregulating PI3K/AKT signaling in breast cancer.
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DOI:
10.1093/jrr/rrac107
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发表时间:
2023-03-23
影响因子:
2
通讯作者:
--
中科院分区:
医学4区
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--
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在癌症中通常会改变染色质修饰酶,但是调节癌症的分子机制仍然很少了解。在此,我们证明了赖氨酸乙酰转移酶7(KAT7)在乳腺癌中上调。 KAT7表达与乳腺癌患者的存活率负相关,而Kat7沉默在体外抑制了乳腺癌的辐射。从机械上讲,KAT7激活了磷脂酰肌醇-4,5-双磷酸3-激酶催化亚基α(PIK3CA)转录,从而增强了PI3K/AKT信号传导和放射线的增强。 AKT或PIK3CA的过表达恢复了由KAT7抑制引起的放射性抑制。此外,KAT7的过表达,而不是Kat7乙酰转移酶活性缺陷的突变体在Ser473位点促进了Akt磷酸化,PIK3CA表达和由于KAT7抑制引起的放射线抑制。总之,KAT7在临床应用方面具有巨大的前景,作为预测乳腺癌患者放射耐药性的新目标。
Chromatin-modifying enzymes are commonly altered in cancers, but the molecular mechanism by which they regulate cancers remains poorly understood. Herein, we demonstrated that Lysine acetyltransferase 7 (KAT7) was upregulated in breast cancer. KAT7 expression negatively correlated with the survival of breast cancer patients, and KAT7 silencing suppressed breast cancer radioresistance in vitro. Mechanistically, KAT7 activated Phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit alpha (PIK3CA) transcription, leading to enhanced PI3K/AKT signaling and radioresistance. Overexpression of AKT or PIK3CA restored radioresistance suppression induced by KAT7 inhibition. Moreover, overexpression of KAT7, but not KAT7 acetyltransferase activity-deficient mutants promoted AKT phosphorylation at the Ser473 site, PIK3CA expression and radioresistance suppression due to KAT7 inhibition. In conclusion, KAT7 has huge prospects for clinical application as a new target for predicting radioresistance in breast cancer patients.
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