期刊
BMC CANCER
卷 22, 期 1, 页码 -出版社
BMC
DOI: 10.1186/s12885-022-10003-w
关键词
NOTCH1; Adult T-cell leukemia; lymphoma; gamma-Secretase inhibitor; Molecular pathogenesis
类别
资金
- JSPS KAKENHI [23591398, 15 K06911, 19 K08870]
- Ministry of Education, Culture, Sports, Science and Technology of Japan
This study reveals that NOTCH1 protein is constitutively activated but likely a passenger in NOTCH1-mutation-negative ATL cell proliferation. Furthermore, GSI does not suppress the growth of ATL cell lines.
Background: Activated mutations in NOTCH1 are drivers of T-cell type acute lymphoblastic leukemia/lymphoma. The gamma-secretase inhibitor (GSI), which suppresses the function of NOTCH1, is expected to be a molecular-targeted agent. NOTCH1 is also expressed in other malignant neoplasms. We aimed to determine the function of NOTCH1 expression and the effects of GSI on adult T-cell leukemia/lymphoma (ATL) caused by long-term human T-cell leukemia virus type I (HTLV-1) infection. Methods: We analyzed the expression of NOTCH1 in six ATL- and HTLV-1-infected cell lines and investigated the influence of activated NOTCH1 (i.e., the cleaved form of NOTCH1) together with GSI on cell proliferation. Results: Activated NOTCH1 found in ATL- and HTLV-1-infected cell lines was undetectable after incubation with GSI, regardless of Tax expression (HTLV-1-coded protein). Whole-exome sequencing revealed that activated NOTCH1 mutations were undetectable in six ATL- and HTLV-1-infected cell lines, regardless of abundant NOTCH1 expression. Moreover, GSI did not suppress the growth of ATL cell lines. Conclusions: These findings suggested that NOTCH1 protein is constitutively activated but is likely a passenger during NOTCH1-mutation-negative ATL cell proliferation.
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