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1.蚌埠医科大学第一附属医院:,肿瘤内科,安徽蚌埠
2.蚌埠医科大学第一附属医院:,泌尿外科,安徽蚌埠
3.蚌埠医科大学第一附属医院:,安徽省肿瘤演进及智能诊疗重点实验室,安徽蚌埠
汪 蕊,E-mail:ruiwang1011@163.com
收稿日期:2025-04-26,
修回日期:2025-06-18,
纸质出版日期:2025-07-30
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何硕,陶璐,武越,等.抗HER2抗体偶联药物联合抗PD-1单抗对小鼠膀胱肿瘤的作用及机制研究[J].陆军军医大学学报,2025,47(14):1623-1631.DOI:10.16016/j.2097-0927.202504097.
HE S,TAO L,WU Y,et al.Effect and mechanism of HER2 antibody-drug conjugate combined with anti-PD-1 antibody in mouse bladder cancer models[J].J Army Med Univ,2025,47(14):1623-1631.DOI:10.16016/j.2097-0927.202504097.
何硕,陶璐,武越,等.抗HER2抗体偶联药物联合抗PD-1单抗对小鼠膀胱肿瘤的作用及机制研究[J].陆军军医大学学报,2025,47(14):1623-1631.DOI:10.16016/j.2097-0927.202504097. DOI:
HE S,TAO L,WU Y,et al.Effect and mechanism of HER2 antibody-drug conjugate combined with anti-PD-1 antibody in mouse bladder cancer models[J].J Army Med Univ,2025,47(14):1623-1631.DOI:10.16016/j.2097-0927.202504097. DOI:
目的
2
探究抗HER2抗体偶联药物(HER2 antibody-drug conjugate,HER2-ADC)联合抗PD-1单抗(anti-PD-1 antibody,anti-PD-1)对HER2表达膀胱癌的协同治疗效果,并阐明其对肿瘤免疫微环境的调控机制。
方法
2
选取40只6~8周龄(体质量18~22 g)的C57BL/6雌性小鼠构建过表达人HER2的MB49膀胱癌细胞C57BL/6小鼠异位肿瘤模型。当肿瘤体积达100 mm³时,采用随机数字表法分为4组(
n
=10):对照组(腹腔注射PBS 1.0 mL),anti-PD-1组(腹腔注射anti-PD-1,每只小鼠200 μg/次,间隔3 d给药),HER2-ADC组(腹腔注射HER2-ADC,2.5 mg/kg,1次/7 d)和联合组(HER2-ADC和anti-PD-1给药方案同单药组)。连续给药28 d,期间每3天测量肿瘤体积与体质量,比较各组异位肿瘤生长速度与荷瘤小鼠生存率。停药后持续观察小鼠生存状态至自然死亡,记录中位生存时间(
n
=5)。药物干预28 d后留取各组部分荷瘤鼠外周血及肿瘤样本(
n
=5),流式细胞术检测外周血MDSCs细胞(CD11b
+
、Gr1
+
)和Treg细胞(CD4
+
、CD25
+
、FOXP3
+
),免疫组化分析肿瘤内CD3
+
T、CD8
+
T、FOXP3
+
T细胞浸润,全自动生化仪评估肝肾功能:谷丙转氨酶(ALT)、谷草转氨酶(AST)、血尿素氮(BUN)、肌酐(CRE)及组织损伤指标:乳酸脱氢酶(LDH-L)的水平。
结果
2
治疗28 d时,联合组肿瘤体积显著低于对照组(
P
<
0.01)及单药组(
P
<
0.01)。单药组(anti-PD-1组中位生存期53 d;HER2-ADC组55 d)及联合组(65 d)均较对照组(41 d)显著延长(
P
<
0.01)。药物干预28 d后,单药组和联合组小鼠外周血中MDSCs细胞和Treg细胞比率低于对照组,联合组较单药组降低(
P
<
0.05)。肿瘤微环境中,联合组CD3
+
T和CD8
+
T细胞浸润水平较对照组和单药组明显增加(
P
<
0.05),FOXP3
+
T细胞浸润水平较对照组和单药组显著减少(
P
<
0.05)。各组血清ALT、AST、BUN、CRE、LDH-L水平差异无统计学意义,且均在正常参考范围内。
结论
2
HER2-ADC联合anti-PD-1可抑制异位膀胱肿瘤生长,可能通过下调MDSCs/Treg并促进CD8
+
T细胞浸润发挥协同作用。
Objective To investigate the synergistic therapeutic effects of HER2 antibody-drug conjugate (HER2-ADC) combined with anti-PD-1 antibody (anti-PD-1) on HER2-expressing bladder cancer and elucidate its regulatory mechanisms on the tumor immune microenvironment. Methods Orthotopic tumor models were established in 40 female C57BL/6 mice (6~
8 weeks old
body mass 18~22 g) using MB49 bladder cancer cells overexpressing human HER2. When tumors reached 100 mm³
the mice were randomized into (
n
=10) control (intraperitoneal injection of 1.0 mL PBS)
anti-PD-1 (200 µg per mouse every 3 d)
HER2-ADC (2.5 mg/kg once weekly)
and combination groups (same regimens as above monotherapy). Tumor volume and body mass were measured every 3 d during 28-day treatment. Tumor growth kinetics and survival rates were analyzed. Post-treatment survival was monitored until natural death to determine median survival time (
n
=5). At day 28
blood and tumor samples (
n
=5) were collected to detect myeloid-derived suppressor cells (MDSCs; CD11b⁺Gr1⁺) and regulatory T cells (Tregs; CD4⁺CD25⁺FOXP3⁺) with flow cytometry
tumor-infiltrating CD3⁺T
CD8⁺T
and FOXP3⁺T cells with immunohistochemical assasy
and liver/kidney functions [alanine aminotransferase (ALT)
aspartate aminotransferase (AST)
blood urea nitrogen (BUN)
creatinine (CRE)
]
and tissue damage indicators [lactate dehydrogenase isoenzyme (LDH-L)
]
. Results In 28 d after treatment
the combination group obtained significantly smallest tumor volume than the control group and the 2 monotherapy groups (all
P
<
0.01). The longest median survival was observed in the combination group (65 d
P
<
0.01)
followed by the HER2-ADC group (55 d)
anti-PD-1 group (53 d) and control group (41 d). After 28 d of treatment
the combination group exhibited obviously the smallest peripheral proportions of MDSCs/Tregs
most tumor-infiltrating CD3⁺T/CD8⁺T cells
and less FOXP3⁺T cells when compared with the 2 monotherapy groups and control group (all
P
<
0.05). While
the 2 monotherapy groups had smaller MDSCs/Tregs proportions than the control group (
P
<
0.05). No significant differences were observed among the 4 groups in serum ALT
AST
BUN
CRE
or LDH-L levels
and all of them were within normal ranges. Conclusion
HER2-ADC combined with anti-PD-1 suppresses the growth of orthotopic bladder tumor
probably through their synergic effects on down-regulating MDSCs/Treg and enhancing CD8⁺T cell infiltration.
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