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2022 Fiscal Year Final Research Report

Study on the Mechanism of Nuclear Receptor-mediated Acquisition of Anticancer Drug Resistance in Human Salivary Gland Tumors

Research Project

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Project/Area Number 20K10161
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 57060:Surgical dentistry-related
Research InstitutionHiroshima University

Principal Investigator

ISHIOKA YASUKI  広島大学, 病院(歯), 歯科診療医 (70770840)

Co-Investigator(Kenkyū-buntansha) 小野 重弘  広島大学, 医系科学研究科(歯), 助教 (70379882)
Project Period (FY) 2020-04-01 – 2023-03-31
Keywords抗癌剤抵抗性 / 唾液腺癌 / 核内受容体
Outline of Final Research Achievements

We examined the apoptosis resistance of the nuclear receptor NR4A2 in salivary gland carcinoma cells showing CD44 high expression and found that the percentage of apoptotic cells induced by 5-FU increased after NR4A2 siRNA knockdown. We also isolated CD44high/ESAlow and CD44high/ESAhigh cells from salivary gland carcinoma cells showing high CD44 expression and examined the involvement of humoral factors in resistance to apoptosis induced by 5-FU, and found that PGE2 produced by CD44high/ESAlow cells, CD44high/ESAhigh cells were shown to be involved in the resistance to 5-FU-induced apoptosis in CD44high/ESAhigh cells.

Free Research Field

外科系歯学

Academic Significance and Societal Importance of the Research Achievements

NR4Aファミリーが抗腫瘍免疫応答の抑制機構に関与することが示唆される報告もあるが、唾液腺癌における抗癌剤抵抗性に関与する可能性についての報告は多くない。今回の研究結果から、CD44高発現を示す唾液腺癌細胞のアポトーシス抵抗性にNR4A2が関与している可能性が示唆され、CD44high/ESAlow細胞が産生するPGE2が、CD44high/ESAhigh細胞の5-FUにより誘導されるアポトーシス抵抗性に関与することが示された。このことから、唾液腺癌細胞における抗癌剤抵抗性獲得機序に核内受容体およびPGE2など液性因子が介している可能性が示唆された。

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Published: 2024-01-30  

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