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目的:探讨热疗对人喉癌Hep-2顺铂耐药（Hep-2/CDDP）细胞株生物学行为的影响和可能机制。方法:采用高浓度冲击联合浓度递增法诱导建立Hep-2/CDDP细胞株。采用细胞计数法检测Hep-2亲代细胞株组（未发生顺铂耐药的Hep-2细胞，采用无顺铂的RPMI 1640培养液培养）、Hep-2/CDDP细胞组、Hep-2/CDDP+顺铂细胞组（采用含4 mg/L顺铂的RPMI 1640培养液培养）的细胞增殖能力。Hep-2/CDDP细胞组和Hep-2亲代细胞株组分别使用含有0、0.004、0.04、0.4、4、40 mg/L顺铂的培养液培养，采用四甲基偶氮唑盐（MTT）法检测Hep-2/CDDP细胞对顺铂、长春新碱、5-氟尿嘧啶的敏感性，计算半数抑制浓度（n IC50）及耐药指数（RI）。将Hep-2/CDDP细胞分为4组，对照组细胞于37 ℃继续培养24 h；热疗组细胞于43 ℃作用2 h后37 ℃继续培养22 h；顺铂组用含4 mg/L顺铂的培养液37 ℃继续培养24 h；热疗联合顺铂组用含4 mg/L顺铂的培养液培养，43 ℃作用2 h后37 ℃继续培养22 h。采用MTT法和流式细胞术检测热疗联合顺铂对Hep-2/CDDP细胞增殖和早期凋亡的影响；采用析因分析法观察热疗联合顺铂对Hep-2/CDDP细胞增殖和早期凋亡影响的交互作用；采用蛋白质印迹法检测热疗联合顺铂对Hep-2/CDDP细胞野生型p53和PI3K表达的影响。将Hep-2/CDDP细胞分为4组，对照组Hep-2/CDDP细胞于37 ℃继续培养24 h；化疗药组采用12 mg/L长春新碱或9 mg/L 5-氟尿嘧啶处理细胞；热疗组Hep-2/CDDP细胞于43 ℃作用2 h后37℃继续培养22 h；热疗联合化疗组采用含有12 mg/L长春新碱或9 mg/L 5-氟尿嘧啶的培养液培养，43 ℃作用2 h后37℃继续培养22 h。采用MTT法检测热疗分别联合长春新碱、5-氟尿嘧啶对Hep-2/CDDP细胞增殖的影响。n 结果:成功建立Hep-2/CDDP细胞株。不同时间Hep-2/CDDP细胞组、Hep-2亲代细胞株组和Hep-2/CDDP+顺铂细胞组的细胞数差异均无统计学意义（均n P>0.05），倍增时间分别为43.8、40.6和43.5 h。Hep-2亲代细胞株组和Hep-2/CDDP细胞组对顺铂的n IC50分别为4.771 mg/L和42.749 mg/L，RI为8.960。热疗联合顺铂可抑制Hep-2/CDDP细胞增殖（n F=327.91，n P 0.05), and the doubling time was 43.8, 40.6 and 43.5 h, respectively. The n IC50 of Hep-2 parental cell line group and Hep-2/CDDP cell group to cisplatin was 4.771 mg/L and 42.749 mg/L, respectively, and the RI was 8.960. Hyperthermia combined with cisplatin could inhibit the proliferation of Hep-2/CDDP cells (n F = 327.91, n P < 0.05) and promote the early apoptosis of Hep-2/CDDP cells ( n F = 724.63, n P < 0.05). Factorial analysis showed that hyperthermia combined with cisplatin had an interaction effect on the proliferation and early apoptosis of Hep-2/CDDP cells ( n F = 185.68, 472.51, all n P < 0.05). Western blotting showed that the relative expression levels of wild-type p53 protein and PI3K protein in the control group, hyperthermia group, cisplatin group and hyperthermia combined with cisplatin group were significantly different ( n F = 547.76, 404.44, all n P < 0.01). Hyperthermia combined with vincristine or 5-fluorouracil could inhibit the proliferation of Hep-2/CDDP cells ( n F = 33.06, 34.61, all n P 0.05).n Conclusions:Hyperthermia may reverse the resistance of Hep-2/CDDP cell line to cisplatin by upregulating wild-type p53 expression and inhibiting the PI3K pathway. Hep-2/CDDP cell line has cross-resistance to vincristine and 5-fluorouracil. Hyperthermia can increase the sensitivity of Hep-2/CDDP cell line to vincristine and 5-fluorouracil.