β整合素家族在儿童急性T淋巴细胞白血病的表达及其临床意义

目的探讨β整合素家族成员在儿童急性T淋巴细胞白血病(T-ALL)的表达及临床意义。方法收集22例初诊T-ALL患儿和21例对照(非恶性血液病患者和骨髓移植供者)的骨髓标本,采用实时荧光定量PCR方法,检测β整合素家族各成员的m RNA表达;并利用整合素抑制剂精氨酸-甘氨酸-天冬氨酸(RGD)肽作用于Jurkat细胞,采用CCK 8法和流式细胞术检测Jurkat细胞生存率和凋亡情况。结果与对照组相比,T-ALL患儿的整合素β_2、β_3、β_5的m RNA表达水平显著下调(P0.05)。在外周血白细胞计数100×10~9/L、第33天骨髓不缓解或MRD阳性的T-ALL患儿中,整合素β_3表达水平较高(P0.05);复发T-ALL患儿整合素β_5的表达高于无复发T-ALL患儿(P0.05)。整合素β3高表达T-ALL患儿的EFS率、OS率均低于β_3低表达者(P0.05)。与未处理组比较,RGD肽处理的Jurkat细胞生存率较低、凋亡率均高(P0.05)。结论β整合素可能通过影响细胞的增殖和凋亡而影响T-ALL的发生发展,整合素β_5的表达与T-ALL复发风险密切相关,整合素β_3的表达与T-ALL患儿治疗反应及预后密切相关。

Expression of β-integrin family members in children with T-cell acute lymphoblastic leukemia

Objective To study the expression of β-integrin family members in children with T-cell acute lymphoblastic leukemia (T-ALL) and their significance. Methods Quantitative real-time PCR analyses were performed to assess the expression levels of β-integrin family members in bone marrow samples from 22 children with newly-diagnosed T-ALL and 21 controls (16 children with non-malignant hematologic disease and 5 healthy donors with bone marrow transplantation). Jurkat cells were treated with integrin inhibitor arginine-glycine-aspartate (Arg-Gly-Asp, RGD) peptide. The cell viability and apoptosis rate were determined by CCK8 assay and flow cytometry respectively. Results The mRNA levels of integrins β2, β3, and β5 were significantly lower in children with T-ALL than in controls (P<0.05). In T-ALL patients, high integrin β3 expression was associated with lower white blood cell counts (<100×109/L), minimal residual disease (MRD) positivity, and day 33 bone marrow negative remission (P<0.05). In T-ALL patients, higher integrin β5 expression was associated with relapse of T-ALL (P<0.05). Based on survival curve analysis, higher integrin β3 expression was related to lower event-free survival and overall survival rates. RGD peptide treatment inhibited the proliferation of Jurkat cells and increased their apoptosis rate (P<0.05). Conclusions β-Integrin may play a role in the occurrence and development of T-ALL by affecting cell proliferation and apoptosis. The expression of integrin β5 is closely related to the risk of relapse of T-ALL. The expression of integrin β3 is closely related the treatment response and prognosis of T-ALL.